Engine Auxiliary Belt; Weight Transfer Adjustment; Steering Shaft Adjustment - Jacobsen JMP653F Manual

7 ADJUSTMENTS
7.2

ENGINE AUXILIARY BELT ______________________________________________

Check And Adjust The auxiliry Belt
The auxiliary belt tension is adjusted to prevent the stress on the alternator
bearings and to prevent movement on the alternator pulley. Use the procedure
shown below to check the belt tension at the center of the belt between crank
shaft and alternator pulleys.
1. Loosen the alternator bolt (A) and the pivot bolt below the alternator.
2. Move the alternator to tighten or loosen the belt. A deflection of 7 to 9
mm is needed at the center (B) with a load 10Kgf (98N/22lbs) for a
new belt. A deflection of 8 - 10mm is needed for a used belt.
3. Tighten the bolts.
7.3

WEIGHT TRANSFER ADJUSTMENT_____________________________________

The weight transfer bias can be adjusted on the lift valve. The valve is
accessible by removing the access panel in the operator platform. The valve is
situated on the right hand side.
To adjust:
1. Loosen the locknut A whilst holding the threaded shaft still with the Allen
Key B.
2. Using an Allen key B rotate the threaded shaft clockwise in direction D to
increase weight onto the drive wheels when the traction control button is
operated on the control pod. This improves slope climbing performance. To reduce weight on the drive
wheels when the traction control button is operated on the control pod, rotate the threaded shaft counter
clockwise in direction C. This increases the ground weight of the cutting unit and will reduce the possibility
of cutting unit "bounce" when working at high speed on undulating ground. It is recommended that the
Allen key is turned a 1/4 turn at a time and the weight transfer tested.
3. Tighten locknut A. whilst holding the threaded shaft still with the Allen Key B.
7.4

STEERING SHAFT ADJUSTMENT ______________________________________

The rear motor mounts (A and B) must be parallel to each other
and the machine.
The steering ram shaft must be equal (C and D) on both sides
of the steering ram.
1. Apply Loctite 243 to nut (E) and steering link (F).
2. Assemble rod end to steering link on both side of
axle.
3. Check motor mounts are parallel and ram shaft is
equal on both sides.
4. Torque the nuts (E) to 100Nm (74 lbf-ft).
en-70
A
C
D
E
F
B
D
B
C
F E
A