SECTION 3 - CHASSIS & SCISSOR ARMS
3121166 – JLG Lift – 3-19
Main Gearbox Assembly
1. Inspect seal surface of spindle. Remove any debris
that may be present.
2. Apply a coating of grease to the lip seal of the hub
sub-assembly.
3. Place Spindle Sub-Assembly on table with carrier
side up.
4. Carefully install the hub sub-assembly (seal side
down) onto the spindle. This installation should be a
slip fit and takes place in 3 stages.
a. Stage 1: The hub slides together until the gear
teeth of the hub hit the gear teeth of the 3 output
planets.
b. Stage 2: Find the planet gear that is tight and
turn it until you feel it go into mesh with the hub
gear teeth, apply slight downward pressure to
the hub and then find the next gear that is tight
and do the same.
c. Stage 3: Once all the planet gears are in mesh
apply pressure to the hub, it should go on the
rest of the way.
5. Install retaining ring into the groove on the OD of the
spindle carrier. This is a spiral retaining ring so it will
not require pliers. You will need to pull the retaining
ring apart and work it into the groove.
1. Spindle Sub-Assembly
2. Spiral Snap Ring
3. Input ring Gear
4. Input Sun Gear
5. Cover O-Ring
6. Cover Thrust Washer
7. Cover
8. Cover Snap Ring
9. Pipe Plug
10. Input Carrier Sub-Assembly
11. Hub Sub-Assembly
Figure 3-17. Main Gearbox Disassembly
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