Nautilus Treadmill Lc Users Manual

Nautilus-Treadmill-t518

Nautilus-Treadmill-t514

Nautilus-Treadmill-t516

Nautilus Sport Series T514 Treadmill Service Manual NLS_TM514_516_518_SM_RevB_web Troubleshoot Nautilus Sport Series T514 Treadmill |

2015-02-05

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Be Strong.™

Model:

T514

Model:

T516

T518

Service Manual

Sport Series

Base Model: T514, T516, T518
P/N: 001-6868 Rev B (03/2007)

Display Model: LE, LE-X, LC

Attention!
For detailed instructions and information on assembly and use for
your Nautilus® Sport Series Treadmill, models t514, t516 and t518,
refer to the assembly and owner’s manuals.

Table of contents
Product Serial Number Location---------------------------------------- 4
Product Specifications -------------------------------------------------- 5
Important Safety Precautions ---------------------------------------- --- 6
Mechanical Service Guide
Replacement of Crowned Front Roller --------------------------- 10
Replacement of Drive Motor -------------------------------------- 12
Replacement of Crowned Rear Roller --------------------------- 16
Replacement of Elevation Potentiometer ------------------------ 17
Replacement of Walking Belt ------------------------------------- 19
Replacement of Walking Deck ------------------------------------ 22
Replacement of Upper Electronics ------------------------------- 24
Replacement of Elevation Motor --------------------------------- 25
Replacement of Combo Board ------------------------------------ 27
Electrical and Mechanical Troubleshooting Guide ---------------- 29
Console Code Summary Guide
Console Code Errors ----------------------------------------------- 34
Electronics Display
Management Menu ----------------------------------------------- 39
Appendix 1 - Wiring Schematic 110V Single AC Inlet ------------- 40
Appendix 2 - Wiring Schematic 110V Twin AC Inlet --------------- 41
Appendix 3 - Walking Belt Tension and Tracking Adjustment --- 42
Appendix 4 - Calibration Procedures -------------------------------- 43
Appendix 5 - Interface Connectors DC Volts ------------------------44
Important Contact Numbers ------------------------------------------- 45

Nautilus® Sport Series Treadmill Service Manual

Product Serial Number Locations

Base serial number location
The serial number decal on the base can
be found on the left hand incline arm. This
decal is visible without removing any parts
on the treadmill. To more easily view the
serial number decal, incline the treadmill to
15%.
The serial number and model number listed
on this decal are required when completing
the enclosed warranty card and may be
required when calling Customer Service.
All Sports Series treadmills have a serial
label located on the base.

LE Display

LE-X Display

LC Display

Serial Number Decal Location

Product specifications

Exercise Your Individuality.
With the Nautilus® Sport Series, you can now customize your treadmill. The idea is to find the perfect
combination of treadmill deck platform, console display features and software upgrades that match your fitness
goals, frequency of use, height and weight, and fitness level. You can choose from three treadmill decks, three
displays, and three additional software plug-ins.

Treadmill Deck Platforms

T514

T516

T518

Continuous HP

2.7 HP

3.0 HP Hyperdrive® Technology

User Weight Limit

350 lbs (159 kgs)

375 lbs (170 kgs)

Maximum Grade

15%

Running Surface

20” x 57” (51cm x 1.4m)

Belt Ply

Two Ply

SuperSoft® Deck

Padding

REACT® Deck

Board Surface

Phenolic-Rev

Power Inlets

Front

Front and Rear

ROC™ Bar

N/A

Standard

Grip Heart Rate

N/A

Yes

20” x 57” (51cm x 1.4m)

20” x 60” (51cm x 1.5m)

Console Displays
LE LE-X LC
Languages

English

English, French,

German, Spanish

Workout Programs

6 Preset, 2 Custom

9 Preset, 3 Custom

12 Preset, 3 Custom

Heart Rate Strap

Yes

Heart Rate Program

2 Incline Controlled

Speed Range

0.5 - 12 MPH

(0.8 - 19.3 KPH)

Optional Workout Software N/A

My Nautilus™ Software,

Heart Strong™ Software,

My Nautilus™ LX

Nautilus® Sport Series Treadmill Service Manual

Important safety precautions

When using electrical equipment, always follow these
basic precautions:

IMPORTANT SAFETY INSTRUCTIONS

3. Read, understand, and test the SAFETY STOP PROCEDURES in
the Owner’s Manual before using the treadmill.
4. The Safety Stop Cord does not turn off the electrical current
to the treadmill. The treadmill continues to draw power, even
when the display is off. To avoid electric shock, do not remove

The following definitions apply to the words “Danger” and
“Warning” found throughout this manual:

7! 2 . ) . '

Used to call attention to potential
hazards that could result in personal
injury or loss of life.

treadmill motor covers or place hands beneath the treadmill
while the treadmill is plugged into a power source.
5. Review all of the warning labels on the treadmill before use.
6. The Nautilus® Sport Series Treadmill, models T514, T516
and T518 are intended for home use only. The T514 maximum

Read
all
before using
$!
. 'instructions
%2
the machine.

!4 4 % . 4 ) / .

7! 2 . ) . '

user weight limit is 350 pounds (159 kilograms). The T516
and T518 maximum user weight limit is 375 pounds (170
kilograms). Do not exceed the maximum user weight limits.
7. Before each use of this equipment, inspect the treadmill for
incorrect, worn, or loose components. The machine can be
safely used only when it is regularly inspected for damage or

To reduce the risk of electrical shock, always unplug the

wear. Inoperable components should be replaced, repaired, or

)--%$)!4%!#4)/.2%15)2%$
external power supply from the electrical outlet before

tightened immediately, or the equipment should be taken out

cleaning, maintaining, or repairing.

#!54)/.
To reduce the risk of burns, electric shock, or injury to

$!.'%2

persons: Read this manual in full before operating the
treadmill. Failure to follow these guidelines can produce
a serious or possibly fatal electrical shock hazard or other
serious injury. Consult a qualified electrician as required.

!4 4 % . 4 ) / .
1. Do not plug the treadmill into an outlet until the final assembly
is complete and the motor cover is installed.

of use until repairs have been made.
8. Do
not wear any loose or dangling clothing or jewelry while
using the Nautilus® Sport Series treadmill. Always keep your
hands, feet, clothing, etc. clear from beneath the treadmill and
from all moving parts. Never use your treadmill with the Motor
Cover or Frame Covers removed.
9. Always wear rubber-soled athletic shoes on the Nautilus®
Sport Series treadmill. Never use the treadmill barefooted or
wearing only socks.
10. Do not start the treadmill when someone is standing on
the belt. Always stand on the foot rails on each side of the

2. CONSULT YOUR PHYSICIAN BEFORE STARTING ANY EXERCISE
PROGRAM. Only he or she can determine the exercise program

walking belt when starting the treadmill. Be careful when

)--%$)!4%!#4)/.2%15)2%$

that is appropriate for your particular age and condition. If

you have not been exercising or are pregnant or have a heart
condition or any physical limitation, failure to consult your

#!54)/.

physician before engaging in physical exercise, such as using a
Nautilus® Sport Series treadmill , could result in serious injury
or death. If while using a Nautilus® Sport Series treadmill
you have any pain or tightness in your chest, an irregular heart
beat, shortness of breath, feel faint, light-headed or dizzy or
have any pain or discomfort, STOP and consult your physician
immediately.

mounting or dismounting the treadmill.

11. Keep speed and incline at the lowest settings when someone
is getting on and off the treadmill.
12. Keep the area underneath and around the treadmill clear.
Position the treadmill on a clean, level surface and do not
place the treadmill on thick carpet as it may interfere with
proper ventilation. We recommend the use of a treadmill mat
that may be purchased from your treadmill dealer or Nautilus,
Inc.

Important safety precautions

13. Never position the treadmill with the back end (direction of

and damage if they play with the equipment.

belt travel) facing a wall or any other objects such as furniture
or other pieces of fitness equipment. Failure to do so can
prevent safe exit of the treadmill in an emergency situation
such as falling. Allow a minimum of 79 inches (2 meters)
behind the treadmill and 20 inches (.5 meters) on each side.
14. Before each use of this equipment, check the power cord,

Failure to follow the conditions set forth below shall limit, to the
extent allowed by law, Nautilus ® Inc. responsibility for the safety,
reliability, and performance of this equipment.
•

the product. Each user must read, understand, and carefully

plug, plug receptacle and outlet for signs of damage. If any of

follow all warnings, instructions, and procedures regarding

them appears frayed, loose, worn, or otherwise faulty, or if

the proper use of the treadmill and its accessories.

the insulation appears worn or cracked, do not operate the
machine. Position the treadmill so that the wall plug is visible

Each user must read the Owner’s Manual in full before using

•

Do not remove the treadmill motor covers: dangerous voltages

and accessible. If the power cord is damaged, it must be

are present. Components such as the motor, controller, and

replaced with a power cord from Nautilus, Inc.

display are serviceable only by qualified service personnel.

15. To avoid potential safety and electrical problems, replace with

•

manufacturers’ specified parts only.

electrical installation of the treadmill must comply with the
applicable local or provincial requirements.

16. Always disconnect the treadmill from the power outlet before
cleaning, maintaining, servicing, or removing the motor cover.

•

The equipment must be used in accordance with the
instructions for use.

17. This equipment is classified Class I, Type B, ordinary
equipment. Not protected against fluid ingress. Rated for

The electrical wiring within the treadmill setting and the

•

For further information or instruction on use, maintenance

continuous operation. Do not operate this equipment in the

or specifications, please contact your Authorized Nautilus ®

presence of flammable anesthetic mixtures.

Retail Outlet.

18. Do not let liquid enter the display or motor/controller area. If
liquid enters either area, the area(s) must be inspected and
tested for safety by an approved technician before it can be
used again. Do not place the treadmill near water or outdoors.
Do not use the machine in damp or wet conditions.
19. Increased risk due to leakage of electrical current may result if
this equipment is not grounded properly.
20. The treadmill must be on an appropriate, dedicated electrical
circuit carrying 15 amps (110 Volt model) or 7 amps (220 Volt
model). Nothing else should be connected to the circuit.
21. Do not stand on treadmill motor cover or front trim cover.
22. Parents

and others in charge of children should be aware that
children, because of their natural play instinct and fondness for
experimenting, may be tempted to situations and behavior for
which the equipment is not intended, with resulting damage to
the equipment and injury to the children or others. Children’s
access to the equipment should therefore be controlled, and
they should be instructed about the potential for personal injury

Nautilus® Sport Series Treadmill Service Manual

Important safety precautions
Safety Warning Labels
The following safety warnings are located on the Nautilus® Sport Series treadmill, models T514, T516 and T518. Please
read all safety precautions and warning information prior to using your product. Be sure to replace any warning label if
damaged, illegible, or missing. If you need replacement labels, please call a Nautilus Representative at (800) 628-8458.

Label 1: P
lease make sure all users read, understand, and follow the warning labels on the exercise machine. See Figure
1 for general use safety label.

Location: T he warning label in Figure 1 is located on the top right hand side of the handrail cap.
Figure 1

7!2.).'

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MANUALBEFOREUSING4OAVOIDINJURYSTANDONSIDERAILS
BEFORESTARTINGTREADMILL)NJURYORDEATHCANOCCURIF
EQUIPMENTISNOTUSEDWITHCAUTION2EPLACETHISLABEL
IFDAMAGEDILLEGIBLEORMISSING

.EPASLAISSEZLESENFANTSMONTERSURNISgAPPROCHERDELgAPPAREIL"IENLIREETCOMPRENDRE
LESINSTRUCTIONSDANSLEMANUELDUPROPRIETAIREAVANTDgUTILISERLgAPPAREIL0OUREVITERDEVOUS
BLESSERTENEZVOUSSURLESAPPUISDECHAQUECOTEDELACOURROIEAVANTDEDEMARRERLgAPPAREIL
5NMAUVAISUSAGEDECETEQUIPEMENTPEUTENTRAINERDESBLESSURESETMEMELAMORT2EMPLACEZ
CETTEETIQUETTESIENDOMMAGEEILLEGIBLEOUMANQUANTE
&&

Label 2: “ Warning: If you have not been exercising regularly, consult a physician before starting an exercise program. If
you feel any unusual pain, shortness of breath, or dizziness STOP. Consult a physician.”

“Warning: Remove Safety Key when not in use and store key out of reach of children.”

Location: Located on the left hand side of the console assembly, below the water holder.
Safety Label Locations:

Label 1

Label 2

Model Shown: T518, LC Display

Important safety precautions
Emergency Stop Procedures
Your Nautilus® Sport Series treadmill console display, models LE, LE-X and LC, is equipped with a MAGNETIC STOP
KEY that can protect you from serious injury and inhibit children from playing with and/or being injured on the Nautilus®
Sport Series treadmill. If the Magnetic Stop Key is not fully inserted into the safety keyhole, the Sport Series treadmill
will NOT power up.
Always ATTACH the MAGNETIC STOP KEY Cord clip to your clothing during your workout.
Always remove the Magnetic Stop Key from the Nautilus® Sport Series treadmill when not in use to prevent children or
other persons from using the machine unsupervised.

Magnetic Stop Key

7! 2 . ) . '
REMOVE THE magnetic stop KEY WHILE USING THE Nautilus®
Sport Series treadmill ONLY IN AN EMERGENCY. WHEN THE KEY
IS REMOVED, THE Nautilus® Sport Series treadmill WILL STOP
INSTANTLY, WHICH COULD CAUSE SOMEBODY USING THE MACHINE TO
LOSE BALANCE OR FALL. This feature is meant to prevent serious
harm and, used properly, is an excellent way to protect your
safety during your workout.

$!.'%2
Nautilus® Sport Series Treadmill Service Manual

Mechanical Service guide

1.0 - REPLACEMENT OF CROWNED FRONT ROLLER
Tools Needed:
• Phillips Screwdriver
• 3/16 inch Hex Key / Allen Wrench
• 1/2 inch wrench
• 7/16 inch wrench

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

7! 2 . ) . '
AS LONG AS THE TREADMILL IS PLUGGED INTO A
POWERED OUTLET AND THE TREADMILL CIRCUIT
BREAKER IS ON, THE UNIT IS RECEIVING POWER,
EVEN IF THE DISPLAY IS TURNED OFF. ALWAYS
UNPLUG THE POWER CORD FROM THE OUTLET
AND TREADMILL WHEN PERFORMING REPAIRS OR
MAINTENANCE.

Figure 2:

$!.'%2

1-1 Elevate the treadmill, secure power and then
unplug the power cord from the wall outlet.

!4 4 % . 4 ) / .

1-2 Remove (4) Phillips head screws with a Phillips
screwdriver from the inside, lower right upright
plastic cover and (4) Phillips head screws from
the outer right side plastic cover. Remove the right
side outer plastic cover (Figure 1). Repeat process
)--%$)!4%!#4)/.2%15)2%$
on the left side.
1-3 Remove the motor cover (Figure 2 & 2A).

#!54)/.

1-4 R
elease the tension from the walking belt by
loosening the rear roller bolts using the 3/16 inch
Hex Key/Allen wrench provided with the treadmill.
Turn the rear roller bolts counter clockwise to
release tension.
1-5 With a 3/16 inch hex key, remove the front roller
bolt located on the left hand side of the treadmill
(Figure 4).

Figure 2-A:

Mechanical Service guide

1-6 L oosen the (4) nuts on the Motor base using a 1⁄2 inch
wrench from the underside of the motor pan. Using a
7/16 inch wrench loosen the nut of the “Motor tension
bolt” located on the front of the motor (Figure 5). Do
not unscrew it all the way, loosen the motor to get
enough slack in the drive belt to slide the belt off the
motor shaft pulley.

Note: R
emoval of the bracket upright support (Figure
6) may help in the completion of Step 5, but is
not required.

Figure 3:

1-7 R
emove the drive belt from the roller pulley and slide
the roller out.
1-8 R
eplace the roller and re-assemble in reverse order
from Step 1-4 to Step 1-7.

Figure 4:

1-9 R
eplace the motor cover first, then replace the lower
outer plastics using (4) Phillips head screws per side,
and the lower inside upright plastics using (4) Phillips
head screws, per side.
1-10 C
heck for proper belt tension following the Walking
Belt Tension Adjustment and Tracking Adjustment in
the Appendix 3.

Figure 5:

Figure 6:

Nautilus® Sport Series Treadmill Service Manual 11

Mechanical Service guide

2.0 - REPLACEMENT OF DRIVE MOTOR

Figure 1:

Tools Needed:
• Phillips Screwdriver
• 1/2 inch wrench
• 3/16 inch Allen wrench
NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

Figure 2:

$!.'%2

2-1 Elevate

the treadmill, secure power and then
unplug the power cord from the wall outlet.

!4 4 % . 4 ) / .

2-2 R
emove (4) Phillips head screws with a Phillips
screw driver from the inside, lower right upright
plastic cover and (4) Phillips head screws from
the outer right side plastic covers.
2-3 R
)--%$)!4%!#4)/.2%15)2%$
emove the right side outer plastic cover (see
Figure 1).
2-4 Repeat Step 2-2 and 2-3 on the left side.

#!54)/.

2-5 Remove the Motor Cover (see Figure 2 and 2A).
2-6 R
emove the (6) 1/2 inch bolts from the bracket
upright support (see Figure 3) and remove the
bracket.
2-7 L oosen the motor tension bolt located in front
of the motor using a 1/2 inch wrench and then
remove the (4) 1/2 inch nuts and bolts (bolt heads
located under the motor pan) from the motor base
(see Figure 4 and 4A).
12

Figure 2A:

Mechanical Service guide

Figure 3:

2-8 S
lide the drive belt off the pulley on the end of the
motor shaft.
2-9 T race the wires going from the motor to the motor
controller (see Figure 5). Unplug the red and black
wires that connect to the motor controller and
remove the Phillips head screw that attaches the
green ground wire to the mounting plate to the
treadmill motor pan (see Figure 5A).
2-10 S
lide the motor towards the belt, then lift the
motor out.
NOTE: Depending on the motor type
(manufacturer) Steps 2-11, 2-12 and 2-13)
may be omitted.

Figure 4:

2-11 R
emove the motor pulley and flywheel with a 3/16
inch Allen wrench (see Figure 6). Remove the
plastic fan by removing the clamp (see Figure 6A)
and twisting the fan off the motor shaft.
2-12 I nstall the flywheel, pulley and plastic fans to the
motor shaft.
NOTE: D
o not tighten the flywheel/pulley at this
time.
2-13 I nstall the motor and slide the drive belt onto the
motor pulley and align the motor pulley with the
front roller pulley. Tighten the motor pulley with a
3/16 inch Allen wrench.

Figure 4A:

- OR 2-14 S
lide the (4) 1/2 inch bolts up through the bottom
of the motor pan, through the motor base and
attach the (4) nuts. DO NOT TIGHTEN. Install the
motor tension bolt and using a 1/2 inch wrench
tighten until the drive belt fits with little or no
slack on the front roller. At this point, tighten the
(4) bolts at the motor base.

Nautilus® Sport Series Treadmill Service Manual 13

Mechanical Service guide

2-15 P
lug the red and black motor wires onto the
motor controller. The red wire goes on the A+
terminal and the black wire goes to the Aterminal. Attach the green ground wire to the
controller/frame with the Phillips head screw
(see Figure 7 and 7A).

Figure 5:

2-16 R
eplace the motor cover first, then replace the
lower outer plastic cover using (4) Phillips head
screws per side, and the lower inside upright
plastic cover using (4) Phillips head screws, per
side.
2-17 R
ecalibrate the electronics. See the Calibration
Procedure in Appendix 4.
Figure 5A:

Figure 6:

Figure 6B:
Figure 6A:

Mechanical Service guide

Figure 7:

Figure 7A:

MOTOR SPECIFICATIONS
T514
T516/T518
T516/T518 (International Models)

2.7 HP 110V
3.0 HP 110V
3.0 HP 220V

Nautilus® Sport Series Treadmill Service Manual 15

Mechanical Service guide

3.0 - REPLACEMENT OF CROWNED REAR ROLLER
Tools Needed:
• Phillips Screwdriver
• 3/16 inch Allen wrench

Figure 1:

$!.'%2

3-1 Turn

off the power switch and unplug the power
cord from the wall outlet.

Figure 2:

!4 4 % . 4 ) / .

3-2 L ift the rubber side rail (back left side) and then
using a Phillips head screw driver remove the
screw that holds the left end cap to the frame (see
Figure 1).

)--%$)!4%!#4)/.2%15)2%$

3-3 R
emove the (2) Phillips head screws from the back
of the end cap (see Figure 2) and remove cap. This
will reveal the rear roller bolt.

#!54)/.

3-4 U
sing the 3/16 inch Allen wrench provided with
the treadmill, remove the rear roller bolt (see
Figure 3).
3-5 R
epeat Step 3-2, Step 3-3 and Step 3-4 on the right
side of the treadmill.
3-6 Remove rear roller.
3-7 I nstall the new rear roller using 2 rear roller bolts
and tighten them up with the 3/16 inch Allen
wrench. Center the roller to the center of the rear
roller brackets (left and right side).
3-8 T ighten and align the walking belt using the
instructions in Appendix 3.
16

Figure 3:

Mechanical Service guide

4.0 - REPLACEMENT OF ELEVATION POTENTIOMETER
Tools Needed:
• Phillips Screwdriver

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

$!.'%2

Figure 2:

4-1 R
emove (4) Phillips head screws with a Phillips
screwdriver from the inside, lower right upright
plastic covers and (4) Phillips head screws from
the outer right side plastic covers. Remove the
right side outer plastic cover.

!4 4 % . 4 ) / .

4-2 Repeat Step 4-1 on the left side

)--%$)!4%!#4)/.2%15)2%$

4-3 Remove the motor cover.

4-4 U
nplug the elevation cable from the Elevation Pot
located on the top of the elevation lift motor (see
Figure 1).

#!54)/.

Figure 3:

4-5 R
emove the elevation potentiometer by removing
the two screws located on both sides of the pot
(see Figure 2).
4-6 R
emove the pot by pulling it straight up (see Figure
3).
NOTE: You may need to pry up gently on the
bracket holding the pot.

Nautilus® Sport Series Treadmill Service Manual 17

Mechanical Service guide

4-7 R
einstall the elevation potentiometer (see Figure
4) - taking note of the flat spot on the shaft of the
pot in relation to the flat spot on the cam inside the
elevation motor (see Figure 5).

Figure 4:

NOTE: Do not force the elevation pot. It should
mate up with little or no pressure.
4-8 R
econnect the elevation cable to the
potentiometer making sure that the colors on the
two wires match up.
4-9 R
eplace the motor cover first, then replace the
lower outer plastics using (4) Phillips head screws
per side. Replace the lower inside upright plastic
covers using (4) Phillips head screws, per side.
NOTE: Be sure that all wires are secure and out
of the way of any moving parts during
reassembly.
4-10 Recalibrate the treadmill (see Appendix 4).

Figure 5:

Mechanical Service guide

5.0 - REPLACEMENT OF WALKING BELT
Tools Needed:
• Phillips Screwdriver
• 1/2 inch wrench

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

$!.'%2

Figure 2:

IMPORTANT! The followings instructions, given as if
you were standing on the treadmill ready to exercise,
will explain how to replace a walking belt by sliding it
off the left side of the treadmill, and replacing it with
a new belt. The instructions should be followed in the
exact sequence listed.

!4 4 % . 4 ) / .

)--%$)!4%!#4)/.2%15)2%$

5-1 E levate the treadmill, secure power and then
unplug the power cord from the wall outlet.

#!54)/.

Figure 2A:

5-2 R
emove (4) Phillips head screws with a Phillips
screwdriver from the inside lower upright plastic
cover and (4) Phillips head screws from the outer
right side plastic cover. Remove the right side
outer plastic cover (see Figure 1).
5-3 Repeat Step 5-2 on the left side.
5-4 Remove the motor cover (see Figure 2 and 2A).

Nautilus® Sport Series Treadmill Service Manual 19

Mechanical Service guide

5-5 L oosen the motor tension bolt (see Figure 3) using
a 1/2 inch wrench and then loosen the (4) 1/2 inch
nuts and bolts (heads located under the motor
pan) securing the motor base to the pan, allowing
the motor to slide towards the belt.

Figure 3:

5-6 S
lide the drive belt off the pulley on the end of the
motor shaft.
5-7 R
emove the front and rear roller following the
instructions for replacement of the front and rear
roller (Section 1: Replacement of Crowned Front
Roller and Section 3: Replacement of Crowned
Rear Roller).
5-8 P
lace the treadmill on its right side (motor side
towards the floor).

Figure 4:

5-9 R
emove the (4) nuts on the underside of the
walking board (see Figure 4 and 4A) and loosen
the other (4) tall isolators nearest the floor.
5-10 R
emove the walking belt by sliding it off the left
side of the walking board.
NOTE: It will be necessary to raise the left side of
the board slightly from the frame to give
clearance to slide off the belt (see Figure 5).
5-11 I nstall the new belt by sliding it over the front and
rear rollers from the left side of the treadmill.
5-12 R
eattach the walking board to the frame using
the (4) nuts and isolators removed in Step 9.
Check the remaining nuts and isolators and
tighten.
5-13 A
ttach the front and rear roller to the frame
following the instructions for replacement of
front and rear roller (Section 1: Replacement of
Crowned Front Roller and Section 3: Replacement
of Crowned Rear Roller).

Figure 4A:

Mechanical Service guide

5-14 P
lace the drive belt over the motor pulley and the
drive pulley. Tighten the nut on the motor tension
bolt until the spring is nearly closed and tighten
the 4 bolts on the motor base.

Figure 5:

5-15 C
heck for proper belt tension following the
Walking Belt Tension Adjustment and Tracking
Adjustment procedures in Appendix 3.
5-16 Replace the motor and plastic covers.

Nautilus® Sport Series Treadmill Service Manual 21

Mechanical Service guide

6.0 - REPLACEMENT OF WALKING DECK
Tools Needed:
• Phillips Screwdriver
• 1/2 inch Wrench

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

$!.'%2

Figure 2:

6-1 E levate the treadmill, turn off the power, and
unplug the power cord from the wall outlet.

!4 4 % . 4 ) / .

6-2 R
emove (4) Phillips head screws with a Phillips
screwdriver from the inside, lower upright plastic
cover and (4) Phillips head screws from the outer
right side plastic cover. Remove the right side
)--%$)!4%!#4)/.2%15)2%$
plastic cover (see Figure 1).
6-3 Repeat Step 6-2 on the left side.

#!54)/.

6-4 Remove the motor cover (see Figure 2).

6-5 L oosen the motor tension bolt (see Figure 3) using
a 1/2 inch wrench and then loosen the (4) 1/2 inch
nuts and bolts (bolt heads located under the motor
pan) securing the motor base to the pan. This will
allow the motor to slide towards the belt.
6-6 S
lide the drive belt off the pulley on the end of the
motor shaft.

Figure 3:

Mechanical Service guide

6-7 R
emove the front and rear roller following the
instructions for Replacement of Crowned Front
Roller (Section One) and Replacement of Crowned
Rear Roller (Section Three).

Figure 4:

6-8 P
lace the treadmill on its right side (motor side
towards the floor).
6-9 R
emove (8) nuts (tall isolators) on the underside of
the walking board (see Figure 4 and 5).
NOTE: Do Not remove the (4) short isolators from
the frame.
6-10 R
emove the (8) screws holding the side rails on
from the under side of the board. Remove the
side rails (see Figure 6). Also remove the belt
guides.

Figure 5:

6-11 I nstall the new board to the side rails and
isolators. Slide the walking belt over the walking
board before installing the walking board to the
frame. Re-attach the walking board to the frame
using the (8) bolts and isolators removed in Steps
6-9 and 6-10.
6-12 C
heck the remaining nuts and isolators and
tighten.
6-13 A
ttach the front and rear rollers following
the instructions for Replacement of Crowned
Front Roller (Section One) and Replacement of
Crowned Rear Roller (Section Three).

Figure 6:

6-14 P
lace the drive belt over the motor pulley and the
drive pulley. Tighten the nut on the motor tension
bolt until the spring is nearly closed and tighten
the 4 bolts on the motor base.
6-15 C
heck for proper belt tension following the
Walking Belt Tension Adjustment and Tracking
Adjustment in Appendix 3.
6-16 Replace the motor cover and side plastic covers.
Nautilus® Sport Series Treadmill Service Manual 23

Mechanical Service guide

7.0 - REPLACEMENT OF UPPER ELECTRONICS
Tools Needed:
• Phillips Screwdriver

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

$!.'%2

Figure 2:

7-1 T urn off the power switch and unplug the treadmill
from the wall outlet.

!4 4 % . 4 ) / .

7-2 T o access the electronic board remove the (6)
Phillips head screws holding the access panel in
place (see Figure 1).
7-3 R
emove
all of the jumper wires (see Figure 2 and
)--%$)!4%!#4)/.2%15)2%$
2A).
7-4 R
emove the (4) small Phillips screws holding
the electronics to the console and remove the
electronics (see Figure 2).

#!54)/.

7-5 R
einstall the new electronics making sure the
area between the electronics and the plastic
console is free of any obstructions.
7-6 P
lug all wires into their original positions making
sure that each has made a good contact and
replace mounting screws.
7-7 Recalibrate the electronics (see Appendix 4).

Figure 2A:

Mechanical Service guide

8.0 - REPLACEMENT OF ELEVATION MOTOR
Tools Needed:
• Phillips Screwdriver
• Flat Head Screwdriver
• Flat Wooden Blocks

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

$!.'%2

Figure 2:

IMPORTANT! The treadmill should be at its lowest
elevation position before performing the steps to
replace the elevation motor.

!4 4 % . 4 ) / .

8-1 Unplug the treadmill.
8-2 R
emove (4) Phillips head screws with a Phillips
screwdriver from the inside, lower right upright
)--%$)!4%!#4)/.2%15)2%$
plastic covers and (4) Phillips head screws from
the outer right side plastic covers. Remove the
right side outer plastic cover (see Figure 1).

Figure 3:

#!54)/.

8-3 Repeat Step 8-2 on the left side.

8-4 Remove the motor cover (see Figure 2).
8-5 U
nplug the motor wires from the control board
(Figure 3) and the elevation potentiometer from
the elevation jumper (see Figure 3A).
8-6 P
lace blocks under the corners of the treadmill to
lift the front.

Nautilus® Sport Series Treadmill Service Manual 25

Mechanical Service guide
8-7 L ocate the two pins, secured by E-clip, that attach
the elevation motor to the swing arm assembly.
Remove the E-clip, securing the pin furthest from the
elevation motor, with a Flat Head Screw Driver (see
Figure 4).

Figure 3A:

8-8 Remove the pin to free the swing arm.
8-9 R
emove the clip and bolt securing the elevation
motor to the frame brackets (see Figure 5).
8-10 Lift and remove the motor.
8-11 P
repare the elevation motor for instillation by
positioning the collar so 3 threads are seen at motor
end.

Figure 4:

8-12 A
ttach the elevation motor to the frame with the clip
and bolt removed in Step 8-9.
8-13 P
osition the threaded shaft collar so pin hole is
aligned with the collar pin hole.
8-14 R
eplace the (2) pins removed in Step 8-7 and secure
pins with E-Clips (see Figure 5).
8-15 C
onnect elevation motor wires to control board and
elevation pot to jumper.
8-16 Remove block supports from front of treadmill.
8-17 Recalibrate elevation per Appendix 4.
8-18 R
e-attach the motor cover following Steps 8-2, 8-3
and 8-4 in reverse.
Figure 5:

Figure 6:

Mechanical Service guide

9.0 - REPLACEMENT OF COMBO BOARD
Tools Needed:
• Phillips Screwdriver
• 1/2 inch wrench

Figure 1:

NOTE:If using a powered driver, it must be on the
“LOW TORQUE” setting, otherwise it will
strip screws.

$!.'%2

Figure 2:

9-1 T urn off the power switch and unplug the treadmill
from the wall outlet.

!4 4 % . 4 ) / .

9-2 R
emove (4) Phillips head screws with a Phillips
screwdriver from the inside, lower right upright
plastic cover and (4) Phillips head screws from
the)--%$)!4%!#4)/.2%15)2%$
outer right side plastic cover. Remove the right
side outer plastic cover (see Figure 1).
9-3 Repeat Step 9-2 on the left side.

#!54)/.

Figure 3:

9-4 Remove the motor cover.

9-5 U
nplug all the wires from the combo board noting
where each wire is located (see Figure 2).
9-6 R
emove the combo board from the mounting
bracket by removing (2) Phillips head screws and
(2) Hex head bolts (see Figure 3).
9-7 I nstall the new combo board (see Figure 3A)
utilizing the existing (2) Phillips screws and (2) Hex
head bolts.
Nautilus® Sport Series Treadmill Service Manual 27

Mechanical Service guide

9-8 P
lug the wires into the new dual board using the
wiring diagram provided in Appendix 1 and 2 .

Figure 3A:

9-9 P
lug the power cord into the wall outlet and start
the treadmill. If the waking belt has a surging
motion you can correct this by slightly turning the
“IR Comp” adjustment pot on the dual board (see
Figure 4 and 4A).
9-10 I f the belt speed is too low during calibration
adjust the max “speed” pot to achieve proper
setting. After changing these settings you should
recalibrate (see Figure 4 & 4A).
9-11 R
eplace the motor cover first, then replace the
lower outer plastic covers using (4) Phillips head
screws per side, and the lower inside upright
plastic cover using (4) Phillips head screws per
side.

Figure 4:

Speed

IR Comp

Figure 4A:

Speed

IR Comp

Electrical and Mechanical troubleshooting guide

Condition / Problem
Knocking noise under the
motor cover or at the rear
of the treadmill.

Chirping or squeaking
noise under motor cover.

Walking belt slips.

Walking belt hesitates
or seems to stick when
stepped on.
Speed loss when treadmill
is walked on.

Motor is making high
pitched noise (T516 or T518
models)

Things to Check
Front and rear roller

Solution
Let the rollers run for a week. Sometimes
bearings will seat and quiet down.

Roller continues to knock, replace the
roller.
Running belt tension
If running belt is overtightened, it will put
excessive load on roller bearings. Loosen
roller adjustment bolts and check for
slippage.
Flywheel / Pulley on
Tighten set screw (5/32) on flywheel /
applicable motors
pulley.
white 6 inch fan on applicable Make sure that the 6 inch fan is not hitting
motors
anything.
Drive Belt Alignment
Adjust the motor pulley and align with
roller pulley.
Drive Belt Grooves
Remove drive belt and check grooves in
belt for foreign matter or debris. Clean
and/or replace belt. Clean drive motor
pulley and roller pulley grooves.
Motor Brushes on T516 or
Remove and inspect the motor brushes.
T518 units only
Sand brush surface and clean commutator
surface and reinstall.
Walking Belt Tension
Tighten walking belt tension.
NOTE: Do Not over tighten walking belt.
Drive Belt Tension
Loosen the 4 motor bolts and then
tighten the drive belt adjustment bolt,
(approximately 2-3 turns) then re-tighten
the 4 motor bolts.
Belt/Deck Lubrication
Spray with NAPA 8300®, Pyroil Silicone®
Lubricant or Lube-N-Walk®
Deck Surface
Check the deck surface and make sure
the surface is in good condition and not
worn.
Walking Belt Tension
Is the walking belt overtightened? Loosen
the walking belt adjustment bolts at the
rear roller. Check for slippage.
Belt/Deck Lubrication
Lubricate belt/deck with Napa 8300®
or Pyroil Silicone® lubricant or Lube-NWalk®.
Motor Brushes
Remove and inspect motor brushes. Sand
brush surface and clean the commutator
and reinstall the brushes.

Nautilus® Sport Series Treadmill Service Manual 29

Electrical and Mechanical troubleshooting guide
Condition / Problem
7.

No elevation up or
elevation down or no
elevation but will calibrate.

Things to Check
Motor Bearings
Elevation Calibration

Elevation Pot Values

Signal to LCB from Console

Elevation Rheostat and the
jumper to the Dual Board.

Solution
Replace the motor.
See Calibration Procedure in the appendix
section. Check the I/O cable connections
at console and dual board.
During elevation calibration, you should
see values from elevation pot in main
display screen lower left. The values
should count up or down during the
elevation calibration procedure. If no
value appears as elevation motor moves,
then calibration will fail. Check wire from
pot to lower control board (LCB) and gray
wire connection in 8 PIN I/O cable.
If value does not change as motor moves,
then remove elevation pot and check
for ohms reading changes as pot shaft
is turned, from white to red and white to
black. If ohms readings do not change
then replace pot. If readings change test
pot jumper. If jumper tests good replace
elevation motor.
Apply safety key, then press the START
button. When you press the INCLINE UP
button, if the Up LED light on the Dual
Board does not come on, check VDC
between Green and Yellow wires in the
8 PIN I/O cable. Assure Green wire is
securely seated in all plugs. If voltage is
present, replace LCB. If no voltage can
be read replace Upper Electronics. If LED
lights up, then you will need to check the
elevation pots at Elevation Common and
the up post and you should be getting 120
volts. If you are getting 120 volts then you
will need to replace the Elevation Motor. If
you do not get 120 volts then you will need
to replace the LCB.
Check the connectors, if good, replace:
1st - The Elevation Rheostat and jumper
to the Dual Board. Then calibrate the
elevation.
2nd - Replace the I/O cable.
3rd - Replace the Upper Electronics.
4th - Replace the Dual Board.

Electrical and Mechanical troubleshooting guide

Condition / Problem
No Power.

No belt movement with
elevation.

Things to Check
Power Source
Safety Key (Magnetic)
Treadmill Circuit Breaker
Switch
Dual Board LED’s

If 115VAC light is on and 12V
light is off
If both 115VAC and 12V lights
are on
Signal to Dual Board

10. Fuses continue to blow or
Running Belt
circuit breaker switch trips.

11. Console powers up, No belt I/O Cable Connectors
movement, No elevation.

Solution
Check for power at outlet.
Make sure Safety Key is in place.
Reset or replace the circuit breaker
(check continuity on the circuit breaker).
If the 115VAC and +12V LED are off, check
household circuit breaker. If good check
the 15 amp fuse on the Dual Board. If both
are good then replace the power cord.
Replace Dual Board.
Insert Safety Key. If LED’s flash, replace
the upper electronics
Check the following LED lights and make
sure they are lit in the Dual Board:
1 - DT6/MC PWM
2 - DT9/Motor Power
3 - ILT4/Arm Volt
If the DT6/PWM LED is not lit, then you
will need to check Yellow wire seating in
6-pin I/O plugs and check VDC between
Blue and Yellow wires. If reading 12
VDC+ then replace LCB. If not, replace
Upper Electronics. If the MC/Sig LED is lit
and the other 2 are not, you will need to
replace the Dual Board.
If all 3 of the LED’s are not lit then you
will change 1) the I/O cables, 2) the upper
Electronic Board.
If all 3 LED’s are lit, then check for DC
voltage at the A1 & A2 posts. If you are
getting DC voltage then change the Motor,
if not then change the Dual Board.
Check the lubrication between the belt
and deck. If the lubrication is good, then
check the condition of the deck surface
and the surface on the underneath side
of the belt. Also check the tension of the
walking belt.
Check I/O cables.

Nautilus® Sport Series Treadmill Service Manual 31

Electrical and Mechanical troubleshooting guide
Condition / Problem

12. Segments Missing.
13. No Speed Reading

Things to Check
Dual Board

Front Roller Pulley
Speed Sensor

14. Electronics shut down
when changing speed or
elevation during workout.
15. Treadmill surges at low
speeds.

16. Heart Rate does not read
consistently.

I/O Cables
Electronics

IR Comp on Motor Controller

Appliances

Chest Strap

Solution
Press POWER button, then the START
button. On the Dual Board the VAC, +12V,
MCSig, -15V, and the ARM Volt LED’s
should be lit. If not:
1 - Replace the Upper Electronics
2 - Replace the Dual Board
Replace Upper Electronics.
Does the front roller pulley have a
magnet? If not replace the front roller.
Is the speed sensor in line with the
magnet on the front roller pulley? Speed
sensor needs to be approximately 1/8 inch
away from magnet. If that is okay, then
make sure that the DT-6/SPEED LED is lit,
as the magnet passes the speed sensor. If
it is not replace speed sensor.
Check the I/O cable.
Replace the Upper Electronics board.

At 0.5 MPH using a step and stopping to
feel if surging is occuring. Adjust the IR
Comp on the Dual Board. Set the speed at
approximately 2.0 MPH. Turn the IR Comp
counter clockwise very slowly counter
clockwise until the surging stops. If you
turn the IR Comp down all the way and it
still surges, then replace the Dual Board.
Check to see that TV’s, computers, two
way radios, microwaves, etc are not
operating anywhere within approximately
8-10 feet of the treadmill.
Try the Chest Strap upside down, then
check the Chest Strap out on the floor
model or check another Chest Strap at the
customer’s location which ever is more
convenient. Make sure the Chest Strap is
being positioned correctly, moistened well
and pulled tight.

Electrical and Mechanical troubleshooting guide

Condition / Problem

17. Speed Display is
inaccurate.

18. Rock BAR does not work.

19. Grip Heart Rate Monitor.

20. Speed Display is
Inaccurate.

Things to Check
Heart Rate Receiver

Solution
Try the following 3 procedures:
1 - Move the Heart Rate Receiver as
far away from the upper electronics as
possible.
2 - Mount the Heart Rate Receiver to the
upright.
3 - Mount the Heart Rate Receiver using a
small piece of foam to soften the vibration.
Or replace Heart Rate Receiver.
Electronics
If all of the above is fine, then change the
electronics and calibrate.
Electronics in MPH or KPH
Push the START button - the speed
should be at .5 MPH. If at .8 KPH, it is
in KPH mode. Change to MPH. See the
Conversion to Metric Procedure.
Check Connection to Console If all connections are okay change cable.
and Check Connection to Rock If still does not work, change Rock BAR.
BAR CHN
Connection to the Grip Heart
If all connections are okay, change HRRate.
board.
Connection to the Heart Rate
Board.
Check for any damage to the
cable from Grip to HR-board.
Calculate the Belt Speed.
Set speed at 3 MPH and count revolutions
of running belt in 1 minute. Then do the
following calcualtion:
T514 or T516: (Revolutions x 10.2917 x 60)
divided by 5280 = _____ MPH.
T518: (Revolutions x 10.7917 x 60) divided
by 5280 = _____ MPH.

Nautilus® Sport Series Treadmill Service Manual 33

Console code summary guide
Console Code Errors
During calibration, all 3 electronics, could display:
“Cal Fail” Auto calibration has exceeded 3 minutes

NOTE: Error is normally speed related.
• Make sure the PWM does not exceed 250.
“Cal Fail Err EL” Indicates Grade pot or grade motor failure

• Check wire connection especially connection from actuator to LCB and from LCB to upper board by
making sure there is no loose connection. If no loose connection change the code/wire. In case none of
these work change the actuator (in isolated incidences you may need to change LCB).
• Before changing parts try to recalibrate the unit this in some cases solves the problem.
• Could be due to any of the Grade Errors Listed Below.
NOTE: LE Operating error codes will freeze electronics. Switch by power cord must be recycled - turn the
switch off for 30 seconds.
“Err LS” Indicates Loss of speed sensor Signal

NOTE: If belt moves Sensor could be out of position or wire connection.

If belt does not move wire connection or Lower Control Board.
• If you had belt movement before this error was displayed, check speed sensor and make sure it is close
enough to pick up a signal from the magnet. Also try to manually move the belt and see if LED (DT16) will
light up.
“Err OS” Over Speed

NOTE: Signals indicate belt is moving faster than speed called for by 3 MPH or higher.
• Check sensor position and recalibrate.
“Err Grd1” Grade motor stalls or overheats

Occurs when grade change is called for but pot signal does not change in 4 seconds.
• Check grade LED bulbs on Lower Control Board (LCB) when grade up or down is pressed to assure signal
is received at LCB.
NOTE: If DT11 is lit on LCB use voltmeter to check for household voltage between Elevation WHITE wire
and BLACK wire. If it is lit but there is no voltage then replace LCB. Or if there is voltage but no
34

Console code summary guide
movement then replace elevation motor.
“Err Grad2” Grade motor moves without command

Indicates grade pot count changes by 3% or more.
• Change grade motor.
“Err Grad3” Grade pot count is 1%+ out of calibrated range

• Recalibrate and if not corrected then replace motor.
LE Stuck Key Test

At power up if any key switch in overlay is stuck the appropriate error code will identify which key.
NOTE: Pressing key may free up switch but overlay should be replaced.
KEY:
STOP
UP
DOWN
FAST
SLOW
ENTER
START
PROGRAM

ERROR DISPLAYED:
“Err STOP”
“Err UP”
“Err DOWN”
“Err FAST”
“Err SLOW”
“Err ENTER”
“Err START”
“Err PROGRAM

NOTE: LEX and LC error codes will freeze electronics. Switch by power cord must be recycled- turn the
switch off for 30 seconds.
“Loss of Signal”
see “ERR LS” above.
“OverSpeed Error”
see “ERR OS” above.
“Grade Error 1”
see “ERR GRD1”above.
“Grade Error 2”
see “ERR GRAD2” above.
“Grade Error 3”
see “ERR GRAD3” above.
Nautilus® Sport Series Treadmill Service Manual 35

Console code summary guide

LC Stuck Key Test

At power up if any key switch in overlay is stuck the appropriate error code will identify which key.
NOTE: Pressing key may free up switch but overlay should be replaced.
KEY:
0
1
2
3
4
5
6
7
8
9
STOP
UP
DOWN
FAST
SLOW
ENTER
START
SCAN
USER
PROGRAM

ERROR CODE:
“Err 0”
“Err 1”
“Err 2”
“Err 3”
“Err 4’
“Err 5”
“Err 6”
“Err 7”
“Err 8”
“Err 9”
“Err STOP”
“Err UP”
“Err DOWN”
“Err FAST”
“Err SLOW”
“Err ENTER”
“Err START”
“Err SCAN”
“Err USER”
“Err PROGRAM”

Console code summary guide

LED #
DT5
DT6
DT9
DT11
DT13
DT15
DT16
ILT1
ILT2
ILT4

Color
Green
Red
Green
Red
Red
Green
Yellow
Green
Red
Red

Function
+12VDC Reference to Chassis, powers up the display board.
Speed command signal from the display panel.
Belt motor power DC bus energized.
Elevation up relay on.
Elevation down relay on.
(220 volt models) Red (110 volt models) AC input power on.
Belt speed indicator.
-15VDC Reference to logic common., powers up control logic.
Motor at current limit indicator.
Belt motor armature voltage level.

Nautilus® Sport Series Treadmill Service Manual 37

Console code summary guide
1400 Motor Controller - Freespirit Models QQ2187 - QQ2197
LED = DT5
Color = Green
Normal Operations
Light is ON

LED = DT6
Color = Red
Normal Operations
Light is BLINKING

+12VD Reference to Chassis,
power up the display board

Speed command signal from
the display panel

If console has no power

There is power to the console but
no belt movement

If light is ON, you have
12V power to the upper
board

If light is NOT ON you
don’t have power to
the upper board

Check I/O cable
connections to the upper
and lower boards, if they
are good

Replace lower board

Replace
upper
Board

Light is ON you have
speed command from the
upper board
Check I/O cable
connections to the upper
board, if they are good

Replace
upper
Board

Replace
I/O
Cables

LED = DT9
Color = Green
Normal Operations
Light is ON
Belt motor power DC bus energized
You are receiving a speed signal from
upper board

When light is ON you are sending
power to the DC buffer
Check the ILT4

If ILT4 is ON replace
the motor

If ILT4 is NOT ON
replace the lower board

If light is NOT ON check DT6

If DT6 is ON, but DT9 is not replace the
lowere board

Light is NOT ON you have
no speed command from
the upper board

Check DT9

Electronics display

Management Menu
To access the Management Menu, press and hold the SPEED UP and SPEED DOWN Keys for three seconds while in
Standby Mode. Treadmill is now in Management Menu Mode.

LE Display:
1. TOTAL HOURS will be shown on the display, press ENTER Key to advance.
2. TOTAL MILES/KMs will be shown on the display, press ENTER Key to advance.
3. UNITS will be shown on the display, press SPEED UP/DOWN or INCLINE UP/DOWN to change units from English
to Metric or from Metric to English. Press ENTER Key to advance.
4. SOFTWARE VERSION will be shown on the display, press ENTER Key.
5. Treadmill will now exit Management Menu Mode and return to the Standby Mode.

LE-X and LC Display:
1. TOTAL HOURS will be shown on the display, press the ENTER Key to advance.
2. TOTAL MILES/KMs will be shown on the display, press the ENTER Key to advance.
3. MAX SPEED will now be shown on the display and the treadmill’s current maximum operating speed will be
displayed. To change this max speed use the SPEED UP/DOWN Keys or numeric keypad and press the ENTER Key
to confirm. Note: The treadmill is preset from the factory to its highest operating speed. If the treadmill is to be used
in an unsupervised area, limit the MAX SPEED to a lower value.
4. MAX TIME will now be shown on the display and the treadmill’s current maximum workout time will be displayed.
The time can be adjusted up or down using the SPEED UP/DOWN Keys or numeric keypad if you wish to limit the
maximum workout time. Press the ENTER Key to confirm and advance.
5. UNITS – ENGLISH will now be shown in the display. Use the SPEED UP/DOWN Keys to select between ENGLISH
or METRIC units. Press the ENTER Key to confirm and advance.
6. ( LC Model Only) UP LCD CONTRAST will now be shown in the display window. Use the SPEED UP/DOWN Keys
to adjust the display contrast for the upper display window as needed. Default value is 7. Press the ENTER Key to
confirm and advance.
7. ( LC Model Only) LOW LCD CONTRAST will now be shown in the display window. Use the SPEED UP/DOWN
Keys to adjust the display contrast for the dot matrix window as needed. Default value is 7. Press the ENTER Key to
confirm and advance.
8. LANGUAGE – ENGLISH will now be shown in the display. Use the SPEED UP/DOWN Keys to select English,
French, German or Spanish languages. Press the ENTER Key to confirm and advance.
9. SOFTWARE VERSION will now be shown in the display. Press ENTER Key.
10. Treadmill will now exit Management Menu Mode and return to the Standby Mode.

Nautilus® Sport Series Treadmill Service Manual 39

Appendix 1 - wiring schematic - 110v single ac inlet

P/N 000-7888

Appendix 2 - wiring schematic - 110v twin ac inlets
P/N 000-7889









































































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Nautilus® Sport Series Treadmill Service Manual 41

Appendix 3 - Walking belt tension & tracking adjustment

Tension Adjustment
Tools Needed:
• Hex Key

Figure 1:

1-U
sing a hex key, turn the left and right adjusting
bolts clockwise 1/2 turn (see Figure 1 and 1A).
NOTE: Use care to make each adjustment equal to
ensure proper belt alignment.
2 - T est the belt by running on the belt at
approximately 4 MPH. Then hold the handrail
lightly and resist the belt movement with your feet.
If walking belt slips, repeat Step 1.
Figure 1A:

Tracking Adjustment
Tools Needed:
• Hex Key
1-S
tart the treadmill at minimum speed and incline.
2- I ncrease speed to 5 MPH and make the following
adjustment:
a: If the belt moves to the right, turn the right
tension bolt one 1/4 turn clockwise.
b: If the belt moves to the left, turn the left tension
bolt 1/4 turn clockwise.
NOTE: Run the belt for a minimum of 20 seconds
after making the first adjustment and
before making the second adjustment to
the belt tracking.
3-A
fter making an initial adjustment, run the treadmill
for five minutes and observe how the belt tracks. If
the belt continues to move away from the center,
adjust the appropriate side as in Step 2 until
properly centered.
42

1/2 TURNS - TENSION
1/4 TURNS TO CENTER

Appendix 4 - calibration procedures

Calibration Procedures

1-P
lug the treadmill into the power outlet, insert the
safety key and turn the front power switch on.
2-S
imultaneously press the [INCLINE UP] and the
[INCLINE DOWN] keys.
3 - Press [START] to begin calibration.
4 - “ CAL PASS” will be displayed on the monitor.
Press [STOP] to exit.

Plug the treadmill into the power
outlet, turn the front power
switch on and insert the Magnetic
safety key into the display.

Press [ start ] to begin
calibration.

Simultaneously press the
[ incline up] and the
[ incline down ] keys.

“cal pass” will be displayed
on the monitor. Press [ stop]
key to exit.

Nautilus® Sport Series Treadmill Service Manual 43

Appendix 5 - Interface connectors dc volts

8 - PINS
Description
Elevation Pot Wiper
A/D 5 VDC +
VDC to Electronics
Elevation Up
A/D Ground Reference
Chas Gnd
Run/Stop Relay
Elevation Down

Molex / AMP #
8
7
6
5
4
3
2
1

Wire Color
Gray
Purple
Blue
Green
Yellow
Orange
Red
Brown

Volts
5 VDC+
5 VDC+
12 VDC+
12 VDC+
Gnd Ref
Chas Gnd
12 VDC+
12 VDC+

Wire Color
Blue
Green
Yellow
Orange
Red
Brown

Volts
Gnd Ref
12 VDC +
5 VDC +
-

6 - PINS
Description
Chas Ground
PWM Speed Command
Speed Sensor Signal
-

Molex / AMP #
6
5
4
3
2
1

Important contact numbers
If you need assistance, please have both the serial number of your machine and the date of purchase available when you
contact the appropriate Nautilus office listed below.

OFFICES IN THE UNITED STATES:

INTERNATIONAL OFFICES:

E-mail: customerservice@nautilus.com

For technical assistance and a list of distributors in your
area, please call or fax one of the following numbers.

• TECHNICAL/CUSTOMER SERVICE
Nautilus, Inc.
World Headquarters
16400 SE Nautilus Drive
Vancouver, Washington, USA 98683
Phone: 800-NAUTILUS (800-628-8458)
Fax: 800-523-1049

• INTERNATIONAL CUSTOMER SERVICE
NORTH AMERICA OFFICE
Nautilus, Inc.
World Headquarters
16400 SE Nautilus Drive
Vancouver, Washington, USA 98683
Phone: 800-NAUTILUS (800-628-8458)
Fax: 800-764-7380
E-mail: customerservice@nautilus.com

• MANUFACTURING FACILITY
Nautilus, Inc.
12032 Highway 155 North
Tyler, Texas, USA 75708
Phone: 800-NAUTILUS (800-628-8458)
Fax: 903-877-4113
• CORPORATE HEADQUARTERS
Nautilus, Inc.
World Headquarters
16400 SE Nautilus Drive
Vancouver, Washington, USA 98683
Phone: 800-NAUTILUS (800-628-8458)

• GERMANY OFFICE
Nautilus GmbH
Tel: 02204 61027
Fax: 02204 62890
• ITALY OFFICE
Nautilus Italy s.r.l.
Tel: 031 51 10 86
Fax: 031 34 24 97
• Swiss Office
Nautilus International S.A.
Rue Jean Prouvé 6
1762 Givisiez / Switzerland
Tel: + 41 26 460 77 77
Fax: + 41 26 460 77 70
• United Kingdom OFFICE
Nautilus UK Ltd
Tel: 01 908 267 345
Fax: 01 908 267 346

Nautilus® Sport Series Treadmill Service Manual 45

Model:

T514

Model:

T516

T518

Be Strong.™
For more information about our Sport Series treadmills or other Nautilus ®
equipment for your home, visit www.Nautilus.com/SportSeries.
© 2005 Nautilus, Inc. All rights reserved. Nautilus, the Nautilus logo, My Nautilus, Heart Strong, Changing the Game in Health and Fitness, REACT, ROC, Remote Operation Control, SuperSoft, Hyperdrive, Be Strong
are either registered trademarks or trademarks of Nautilus, Inc.
Nautilus, Inc. World Headquarters, 16400 SE Nautilus Drive, Vancouver, Washington, USA 98683, 1-800-628-8458, www.Nautilus.com.

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Nautilus Treadmill Lc Users Manual

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Nautilus Sport Series T514 Treadmill Service Manual NLS_TM514_516_518_SM_RevB_web Troubleshoot Nautilus Sport Series T514 Treadmill |

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