Main Assembly - JLG 400SC Service And Maintenance Manual

Main Assembly

Refer to Figure 3-34.
1. Slightly tap Internal Gear (2) with spline side down onto
Output Shaft (1A) splines to ensure Internal Gear (2) is
properly seated.
2. Grease and install O-ring (5) on Housing (1G) O-ring
groove.
3. Grease and install Thrust Spacer (11) into counterbore of
Carrier Sub-assembly on smaller diameter cluster gear
side. The grease should hold the Thrust Spacer (11) in
place for assembly.
4. Place Carrier Sub-assembly on table oriented as shown
below, with large end of Cluster Gear (3F) facing up.
Position all three punch-marks on face of the large gears
at 12 o'clock.
Timing marks on the two upper Cluster Gears will be vis-
ible through slots in the Carrier if Cluster Gears are cor-
rectly marked. Secure gear teeth using timing fixture.
5. Place Ring Gear (4) in to large end of Cluster Gear to
secure timing.
6. Remove Carrier sub-assembly and Ring Gear (4) from
the table and assemble into the Internal gear (2) being
careful to keep the ring gear, or sun gear, in mesh with
the cluster gears.
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SECTION 3 - CHASSIS & TURNTABLE
7. After engaging internal gear teeth and before rotating
carrier, look at the Carrier sub-assembly in the main
assembly and ensure the timing is correct by locating
the timing marks in the slots in the carrier and at
12 o'clock on the gear that the timing mark is visible in
the carrier bore.
8. Grease and install O-ring (5A) onto Brake Housing (6)
counterbore.
9. Install Brake Housing (6) onto Ring Gear (4) by aligning
the bolt holes in brake housing with ring gear holes.
10. Ensure the pipe plugs in Housing (1G) and Brake Hous-
ing (6) are timed as shown.
11. Pull one Cover Bolt (12) and place into the bolt hole and
repeat for remaining bolts.
12. Torque Bolts (12) in star pattern to 23-27 ft-lb
(31-36.5 Nm).
13. Install Input Shaft (8) with spline side up into housing
bore. Ensure the input shaft gear teeth and planet gears
are engaged.
14. Install O-ring plugs (1P) into Brake Housing (6) and
Housing (1G). Torque 23 to 24 ft-lb (31 to 32.5Nm).
15. Perform leak and roll check per instructions in this sec-
tion.
16. Fill oil through opening in Brake Housing (6) with
43 oz (1.3 L) of 80W90 gear oil.
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