JLG 500RTS ANSI Service Manual - Manual (Page 37)

SECTION 2 - PROCEDURES
3120696 – JLG Sizzor – 2-21
BEWARE OF SHARP EDGES IN COUNTERBORE WHEN INSTALL-
ING O-RING.
18. Set cover assembly on table, interior side up.
Grease o-ring and place it into counterbore around
edge of cover.
NOTE: O-ring may be stretched or pinched together to make
it fit counterbore exactly.
19. Place cover assembly onto ring gear, aligning pipe
plug holes in cover and hub according to applicable
assembly print. Also, make sure shoulder bolt holes
in cover and ring gear are aligned.
20. Place four flat washers on top of bolt holes in cover
assembly.
21. Place shoulder bolts into four shoulder bolt holes in
cover and tighten by hand.
22. Place remaining twelve flat washers) onto remaining
bolt holes in cover.
23. Place twelve bolts into remaining bolt holes in cover
and tighten.
24. Torque shoulder bolts to 18 - 25 ft lb (25 - 34 Nm).
Torque bolts to 18 - 25 ft lb (25 - 34 Nm).
25. Turn hub over on to its side. Insert coupling into end
of spindle.
26. Roll test unit in both clockwise and counter clock-
wise directions. Perform same number of turns in
each direction as ratio of unit. Ratio is last two digits
of model number on units ID tag. For example, if
model number is W1BFF0335, then roll unit 35 times
in each direction.
27. Leak test unit at a pressure of 5 psi (0.4 bar) for 2-3
minutes.
2.22 DRIVE TORQUE HUB/BRAKE - 4WD
FRONT
NOTICE
TORQUE HUB UNITS SHOULD ALWAYS BE ROLL AND LEAK
TESTED BEFORE DISASSEMBLY AND AFTER ASSEMBLY TO
MAKE SURE THAT THE UNITS GEARS AND SEALANTS ARE
WORKING PROPERLY.
Disassembly
1. Remove pipe plug from cover and drain oil from unit.
2. Inspect spindle/brake as follows:
a. Examine two brake ports on bottom of spindle/
brake. Bottom of one is tapered and bottom of
other one is flat. Install hydraulic line of a hand
pump into flat brake port.
b. Install a bleeder valve into tapered brake port.
c. Insert roll checker into spindle/brake. If brake is
not working properly, roll checker should not
turn.
d. Set hand pump to PUMP.
e. Increase hydraulic pressure in brake by pump-
ing gradually. At the same time, try to turn roll
checker. If brake is set correctly, roll checker
should turn when pump pressure reaches 140 to
160 psi (10-11 bar).
f. Roll test brake in both clockwise and counter-
clockwise directions. Perform same number of
turns in each direction as ratio of unit. This num-
ber is the same as the last two digits of the
model number found on the units ID tag. For
example, if units model number is W1BJ4U318,
then it should be rolled 18 times in both direc-
tions.
g. Set hand pump to RELEASE and check to see if
brake has reset itself. If brake has reset roll
checker should not be able to turn.
h. Remove roll checker from spindle/brake.
i. Remove hydraulic line from its brake port.
j. Remove bleeder valve from its brake port.
3. Leak test unit at a pressure of 5 psi (0.4 bar) for 2 to
3 minutes.
4. Remove the twelve grade 8 bolts and four shoulder
bolts from cover.
5. Remove flat washers from cover.
6. Remove cover from hub.
7. If necessary, disassemble cover as follows:
a. Remove pipe plug from cover if it has not
already been removed.
b. Set cover down so that its open end faces up.
Remove o-ring from counterbore in cover. Dis-
card o-ring.
c. Turn cover over. Remove two bolts that hold dis-
connect cap in place.
d. Remove disconnect cap from cover.
e. Remove two remaining bolts that hold cover cap
in place.
f. Remove cover cap from cover.
g. Remove disconnect rod from cover cap.
h. Remove o-ring from groove inside cover cap.
Discard o-ring.
i. Remove o-ring from outside of cover cap.