JLG 15/20MSP Service Manual - Manual (Page 50)

SECTION 3 - BASE COMPONENTS
3-16 – JLG Lift – 3121231
Main Gear Box Sub-Assembly
1. Inspect seal surface of Spindle Sub-Assembly.
Remove any debris or burrs that may be present.
2. Apply a coating of grease to the Lip Seal (not
shown) in the Hub Sub-Assembly.
3. Place Spindle (G1) Sub-Assembly on table with car-
rier side up.
4. Carefully install the Hub Subassembly (seal side
down) onto the Spindle Sub-Assembly. This instal-
lation should be a slip fit and takes place in 3 stages.
Stage 1: The hub slides together until the gear teeth
of the hub hit the gear teeth of the 3 Output Planet
Gears (G9).
Stage 2: Find the Output Planet Gear (G9) 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.
Stage 3: Once all the Output Planet Gears (G9) are
in mesh apply pressure to the hub, it should push on
the rest of the way.
5. Install Retaining Ring (G27) into the groove on the
OD of the Spindle (G1) carrier. This is a Spiral
Retaining Ring so it will not require pliers. You will
need to pull the Retaining Ring (G27) apart and
work it into the groove.
6. Using the appropriate pressing tool (T-174356),
press in the Input Ring Gear (G3) into the bore of
Hub Subassembly.
NOTE: Do not use excessive pressing force because it will be
reacted by the main wheel bearings.
7. Install the Input Carrier Subassembly into mesh.
The Output Sun Gear (G8) portion of the Input Car-
rier Subassembly will mesh with the Output Planet
Gears (G9) and the Input Planet Gears (G5)
mounted on the Input Carrier Subassembly will
mesh with the Input Ring Gear (G3).
8. Install the Input Sun Gear (G4) into the area
between the three Input Planet Gears (G5).
9. Apply a coating of grease to the Cover O-ring
(G20) and install it into the o-ring groove of the Hub
Subassembly.
NOTE: It may be helpful to stretch the o-ring (G20) out prior to
assembly to avoid pinching or shearing when the Cover
(G11) is assembled.
10. Apply Loctite 380 or 480 glue to Cover Thrust
Washer (G21) and place it in the center counter
bore of the Cover (G11) so that the steel face of the
washer is out of the bore.
NOTE: Make sure that both the Cover Thrust Washer (G21) and the
Cover (G11) have good clean surfaces for the Loctite to
properly adhere.
11. Center the Cover (G11) in the hub bore so that the
"JLG" logo is up. Push it into the bore.
12. Install the Cover Retaining Ring (G19) into the
groove of the Hub Sub-assembly.
Main Gear Box Sub-Assembly