Main Gear Box Sub-Assembly - JLG 1230ES Service And Maintenance Manual

SECTION 4 - BASE COMPONENTS

Main Gear Box Sub-Assembly

1. Inspect seal surface of Spindle (1). Remove any debris that may be present.
2. Apply a coating of grease to the Lip Seal (not shown) in the Hub Subassembly.
3. Place Spindle (1) Sub-Assembly on table with carrier side up.
4. Carefully install the Hub Subassembly (seal side down) onto the Spindle (1). This installation should be a slip
fit and takes place in 3 stages.
5. Stage 1: The hub slides together until the gear teeth of the hub hit the gear teeth of the 3 output planets.
6. 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.
7. Stage 3: Once all the Planet Gears are in mesh apply pressure to the hub, it should push on the rest of the
way.
8. Install Retaining Ring (27) into the groove on the OD of the Spindle (1) carrier. This is a Spiral Retaining Ring
so it will not require pliers. You will need to pull the Retaining Ring (27) apart and work it into the groove.
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Main Gear Box Sub-Assembly
– JLG Lift –
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