JLG 460SJ Service Manual - Manual (Page 54)

SECTION 3 - CHASSIS & TURNTABLE
3-2 – JLG Lift – 3120895
3. The tightening of the nuts should be done in stages.
Following the recommended sequence, tighten nuts
per wheel torque chart.
4. Wheel nuts should be torqued after first 50 hours of
operation and after each wheel removal. Check
torque every 3 months or 150 hours of operation.
3.2 DRIVE HUB PART NO. 2780243 (2WD
REAR) PART NO. 2780244 (4WD REAR)
The final drive consists of two stages with an integrated
disconnect mechanism. Each stage incorporates a set of
matched planetary gears, which provide an equal load of
distribution. All torque transmitting components are made
of forged, quenched and tempered high-alloy steels.
External gears are carborized. Precision roller bearings
are used exclusively. Two large, tapered roller bearings
support the sprocket or wheel loads. A shaft seal protects
the unit against contamination.
Disassembly
1. Position drive so that one of the fill holes is at the
bottom of the end cover and drain the gear oil.
2. Remove all bolts holding motor and remove motor
from drive.
3. Press out seal ring (85) together with O-ring (84)
from the drive.
4. Compress the disc (65) using a simple fixture or
other suitable device.
5. Remove snap ring (67) from groove of spindle and
release pressure on disc until loose. Remove tool
and disc (65).
6. Remove the springs (74) from the piston (61)
7. Remove plug (71).
8. Supply air pressure through air channel actually
closed by plug (71) to remove piston (61).
NOTE: Be careful when supplying air pressure. piston (61)
may unexpectedly come out quickly.
9. Remove back-up rings (75), piston seal (76), back-
up rings (77), and piston seal (78).
10. Compress the disk (59) using a simple fixture or
other suitable device.
11. Remove snap ring (66) and release pressure on disk
until loose.
12. Remove tool and disk (59).
13. Remove the spring (55) from the input shaft (44)and
turn the unit so that cover (8) is in the up position.
14. Remove screw plugs (22) and seal rings (21).
15. Remove snap ring (34), cover unit (8) from drive and
O-ring (33).
16. Remove first stage planetary assembly (7).
17. Remove hex. hd. bolts (23) to remove gear (30) and
O-ring (19).
18. Remove Snap rings (15) to pull off planet gears (1)
together with cylindrical roller bearings (11) from
spindle (60).
NOTE: Further disassembly of the hub is discouraged. Rein-
stallation of the shaft nut (4) requires a special tool
and a torque of 626 ft lbs (876 Nm) for proper reas-
sembly. These components WILL fail if not properly
reassembled.
19. Inspect the planetary stage assemblies as complete
units. Thoroughly clean and check both the gearing
and the bearings for damage and apply new oil. If
gears or bearings need replacing, they must be
replaced as complete units.
NOTE: The first stage planetary bearings (10) must be
replaced in sets of three pieces.
NOTE: The first stage planetary gears (11) must be
changed as a complete set of four and the manufac-
turer recommends changing the sun gear shaft (43)
along with this set of planets.
NOTE: The second stage planetary bearings (11) must be
replaced in sets of four pieces.
Table 3-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
40 ft. lbs.
(55 Nm)
100 ft. lbs.
(130 Nm)
170 ft. lbs.
(255 Nm)