JLG 25RTS, Service & Maintenance

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SECTION 2 - PROCEDURES
3120826 – JLG Sizzor – 2-27
2.24 DRIVE TORQUE HUB - 2WD/4WD REAR
TORQUE HUB UNITS SHOULD ALWAYS BE ROLL AND LEAK
TESTED BEFORE DISASSEMBLY AND AFTER ASSEMBLY TO
MAKE SURE THAT THE UNIT’S GEARS AND SEALANTS ARE
WORKING PROPERLY.
WHEN REBUILDING A UNIT, USE NEW SEALS AND O-RINGS.
NEVER RE-USE SEALS AND O-RINGS, AS THIS WOULD CAUSE
UNIT TO LEAK.
Disassembly
1. Turn hub over on to its side. Remove coupling from
wide end of spindle.
2. Mark location of shoulder bolt holes on outside of
ring gear and hub for easy re-alignment when
rebuilding. Remove four shoulder bolts and twelve
bolts from cover.
3. Remove sixteen flat washers from cover assembly.
4. Lift cover assembly off of ring gear, and set cover on
table, interior side facing up.
BEWARE OF SHARP EDGES IN COUNTER BORE WHEN REMOV-
ING O-RING.
5. Remove o-ring from counter bore around edge of
cover. Discard o-ring.
NOTE: If o-ring is not in cover counter bore, it is in ring gear
counter bore. Remove o-ring from hub and discard it.
6. If necessary, disassemble cover as follows:
a. Remove two bolts holding disconnect cap to
cover .
b. Remove disconnect cap from on top of cover
cap and cover.
c. Remove two bolts securing cover cap to cover.
Remove cover cap.
d. Remove disconnect rod from cover cap.
e. Pry o-ring from groove inside cover cap. Discard
o-ring.
f. Remove o-ring from flange of cover cap. Discard
o-ring.
g. Remove pipe plug from cover.
7. Remove thrust washer from counter bore in top of
carrier assembly.
8. Remove input gear from middle of carrier assembly .
9. Lift ring gear off of hub.
10. Lift carrier assembly out of hub.
11. If necessary, disassemble carrier assembly as fol-
lows:
NOTE: When removing needle rollers from cluster gears,
discard old needle rollers and use new ones during
re-assembly.
a. Using a punch and hammer, drive roll pin into
planet shaft.
NOTE: If roll pin isn’t driven all the way into the planet shaft,
carrier could be damaged when planet shaft is
removed from carrier.
b. Using a punch and hammer, drive planet shaft
from carrier housing; one thrust washer, one
cluster gear, and one more thrust washer will
come off planet shaft and come to rest inside
carrier. Remove these parts from inside carrier.
c. Remove sixteen needle rollers from inside one
end of cluster gear. Discard needle rollers.
d. Repeat steps (a) through (c) to remove and dis-
assemble two remaining cluster gears.
12. Remove thrust spacer from input shaft assembly in
middle of spindle.
13. Lift input shaft assembly out of middle of spindle,
and stand input shaft on its splined end.
WEAR SAFETY GLASSES WHEN PERFORMING STEP (14). BE
AWARE THAT SPRING AND SPACERS COMPRESSED BY RETAIN-
ING RING MAY POP SUDDENLY OFF SHAFT WHEN RETAINING
RING IS REMOVED.
14. Using retaining ring pliers, remove retaining ring
from groove on input shaft.
15. Remove one spacer, one spring, and other spacer
from input shaft.
16. Remove thrust washer from around spindle.
17. Lift internal gear out of hub.