JLG T500J Service And Maintenance Manual page 43

7. Undo the locknut on the brake rod (front to rear) adja-
cent 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 car-
rier 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 dam-
aged 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, stiff-
ness, 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.
3121200
SECTION 3 - CHASSIS & TURNTABLE
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 resis-
tance is felt as the brake shoes begin to grip the drum,
then slowly turn the brake adjuster bolt counterclock-
wise until the wheel begins to rotate freely again. Alter-
natively advance the adjuster using a screwdriver
through the backplate hole until resistance 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 contact
with the compensator.
DO NOT OVERTIGHTEN AS THIS WILL CAUSE THE BRAKES TO DRAG AND OVER-
HEAT.
DOUBLE CHECK THAT EVERYTHING HAS BEEN REASSEMBLED WITH ALL FAS-
TENERS SECURED.
3. Remove the handbrake locking bolt and operate the
handbrake several times to ensure that the compensa-
tors 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 movement of the
handbrake lever as the energy store operates. This
action should occur once on the rearward 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. Misalignment
can be corrected through adjustment of the cable lock-
ing 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.
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