JLG T350 Service Manual - Manual (Page 59)

SECTION 3 - CHASSIS & TURNTABLE
3121198 – JLG Lift – 3-23
7. Undo the locknut on the brake rod (front to rear)
adjacent to the compensator. Slacken the second
nut on the brake rod. Remove the half shell from the
backplate and detach the brake cable.
8. Record the orientation of the brake shoes and
springs on the backplate to ensure the new shoes
and springs are replaced in the same position as the
old.
9. With care and using a suitable lever, lift sliding shoe
carrier away from expander. Extract expander and
retain.
10. Remove brake shoe retaining spring taking care to
retain the spring. Keep plate or pin at the rear of the
backplate where installed.
11. Lift off whole brake shoe assembly from backplate.
Take care not to lose the two adjuster wedges.
12. Examine the components and springs, replace any
damaged parts. Clean the mechanism and ensure
that all parts are free to move. Do not lubricate.
13. Install the springs on the new brake shoes.
14. Locate the shoes onto the backplate and position
onto the adjuster wedges or cam block.
15. Install the retaining springs.
16. Locate the expander into position on the fixed plate.
17. With care, and using a suitable lever, position the
expander between the shoes and release the lever.
18. Attach the brake cable and install the half shell.
Always replace the brake cables if they show signs
of wear, stiffness, damage, or fraying.
19. Install the drum and bearing. Replace the split pin or
lock nut depending upon which type of nut is used.
If a cotter pin and castellated nut is used, the axle
nut must be adjusted to allow the correct bearing
clearance. If a locknut is used, it is tightened to a
pre-determined torque.
20. Install the hub cap.
21. Repeat the procedure on the other drum.
22. Install the tires and wheels.
23. Follow the procedure under ADJUSTMENT.
ADJUSTMENT
NOTE: When adjusting the brake drum, only turn the wheel
in the direction of forward rotation.
1. Turn each wheel in the direction of forward rotation.
Turn the brake adjuster bolt clockwise until some
resistance is felt as the brake shoes begin to grip the
drum, then slowly turn the brake adjuster bolt coun-
terclockwise until the wheel begins to rotate freely
again. Alternatively advance the adjuster using a
screwdriver through the backplate hole until resis-
tance is felt, then turn back by a few clicks until the
wheel begins to rotate freely again.
2. Turn the nut on the brake rod until the nut is in con-
tact with the compensator.
DO NOT OVERTIGHTEN AS THIS WILL CAUSE THE BRAKES TO
DRAG AND OVERHEAT.
DOUBLE CHECK THAT EVERYTHING HAS BEEN REASSEMBLED
WITH ALL FASTENERS SECURED.
3. Remove the handbrake locking bolt and operate the
handbrake several times to ensure that the compen-
sators are seated. Check the travel of individual
brake cables. This should be 2-5 mm. If not, re-
adjust the brake as appropriate.
4. With the handbrake engaged, turn each wheel in the
reverse direction. They should turn a little and then
lock as the auto-reverse mechanism operates. As
each wheel is turned there will be a rearward move-
ment of the handbrake lever as the energy store
operates. This action should occur once on the rear-
ward turn of each wheel. If any wheel fails to lock,
there is too much slack in the system.
5. Check the compensators are at 90° to the brake rod
with the brakes applied in forward and reverse. Mis-
alignment can be corrected through adjustment of
the cable locking nuts. This is particularly important
if a new cable has been installed.
6. Operate the handbrake and leave it on. Lower the
trailer to the floor and recheck the torque of the
wheel nuts.
7. Please note the brakes will not be 100% effective
until the new linings have bedded in.
8. The brake adjustment should be rechecked after a
short journey.
THE DRUMS MAY BE HOT.