42belt !! 42 Deck Timing

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98-11-45-10
DTAC Solution Number: M11867

22 May 1998
John Deere Horicon Works

MOWER DECK TIMING BELT SLIPS; BLADES CONTACT
Freedom 42 Mower Deck
Complaint or Symptom:
- 42-in. deck belt stretched, blades not in time.
- Blades contacting.
- Need to know how to tension timing belt.

topview

Situation:
- Belt tension not adjusted correctly.
- Mower blade hit object while mowing.

D

Solution:
1. Remove mower deck.
2. Check to see if blades are damaged or
bent. Sharpen or replace blades as required.
IMPORTANT: Even if you do not remove
the blades be sure blade bolts are
tightened to 57 N•m (42 lb-ft).

A

NOTE: There are two different blades.
Install per instructions in the Operator’s
Manual.
3. Remove brake assembly.
4. Remove top cover.

B
A

IMPORTANT: Do not loosen fixed idler (D).
IMPORTANT: Loosening tensioning idler
(A) less than one full turn or more than one
full turn will effect final belt tension.
5. Loosen nut (A) on tensioning idler one full
turn.

M89133
C

98-11-45-10
B

6. Back adjusting nut (B) all the way to the end
of the threads to completely remove tension
from idler bracket (C).

A

NOTE: If tension spring rod bracket (C) is
bent, bend back to original position or
replace.

M89133
C

7. Check condition of timing belt. Replace if
required.

IMPORTANT:

8. Adjust blade timing (index blades 90° ± 10°
apart). Timing holes on top of the right spindle
sheave and left spindle sprocket marks can be
used to determine blade position.

HANDLE TIMING BELTS WITH CARE !
DO NOT Crimp, Fold, or Twist

9. Tighten adjusting nut (B) until the washer is
aligned with the end of the idler arm.
10. Tighten tensioning idler nut (A) to 27 N•m
(20 lb-ft). Rotate belt 2 full revolutions and be
sure belt is tracking on sprocket and idlers.

M136076

If belt does not track straight, it indicates damage to spindle shaft or idlers. Repair as
necessary.
11. Install top cover.
12. Install brake assembly, if equipped.
13. Install mower deck.
Additional Information:
The pre-tensioning system was designed using a visual adjustment of the tension spring to
provide an easy, accurate means to adjust the belt tension.
The tension spring system used on this mower deck is designed to work as a pretensioner
when making adjustments. Therefore, it is critical that the procedure of loosening tensioning
idler nut exactly one turn and then adjusting tension by aligning washer with the bracket and
finally tightening the tensioning idler nut to 27 N•m (20 lb-ft) is followed. Once the tensioning
idler nut is tightened, the spring tensioner has no effect on belt tension.
When the tensioning idler nut is loosened, the adjusting spring sets the initial belt tension. Then
as the idler nut is tightened, the bolt straightens up and completes the tensioning process. The
spring and the bolt combine to provide proper belt tension. The amount of belt tension provided
by tightening the idler nut will vary depending on how loose the nut is during the adjustment
process. Therefore, the idler nut must be loosened EXACTLY one full turn before the
tensioning spring is adjusted.

2
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