SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121642 – JLG Lift – 3-9
Main Disassembly for Drive Hub
NOTE: Refer to Figure 3-3. for part location and listing.
1. Turn hub (1G) over onto its side. Remove coupling (14)
from the wide end of spindle (1A).
2. Mark location of shoulder bolt holes on outside of ring
gear and hub for easy re-alignment when rebuilding.
Remove the four shoulder bolts (13) and twelve bolts
(12) from cover (6).
3. Remove the sixteen flat washers (16) from cover (6).
4. Lift cover sub-assembly (6) off of ring gear (4), and set
cover on table, interior side facing up.
CAUTION: BEWARE OF SHARP EDGES IN THE COUNTERBORE WHEN YOU
REMOVE THE O-RING.
5. Remove o-ring (5) from the counterbore around the
edge of cover (6A). Discard the o-ring.
NOTE: If o-ring is not in the cover counter- bore, it is in the ring
gear counterbore. Remove it from the hub and discard it.
6. Remove thrust washer (11) from the counter- bore in top
of carrier (3A).
7. Remove input gear (8) from the middle of carrier sub-
assembly (3).
8. Lift ring gear (4) off of hub (1G).
9. Lift carrier sub-assembly (3) out of hub (1G).
10. Remove thrust spacer (9) from input shaft (7) in the mid-
dle of spindle (1A).
11. Lift input shaft sub-assembly (7) out of middle of spindle
(1A), and stand input shaft (7A) on its splined end.
WEAR SAFETY GLASSES DURING THIS STEP, AND BE AWARE THAT SPRING AND
SPACERS COMPRESSED BY RETAINING RING MAY POP SUDDENLY OFF SHAFT
WHEN YOU REMOVE THE RETAINING RING.
12. Using retaining ring pliers, remove retaining ring (7B)
from the groove on input shaft (7A).
13. Remove one spacer (7D), one spring (7C), and other
spacer (7D) from input shaft (7A).
14. Remove thrust washer (11) from around spindle (1A).
15. Lift internal gear (2) out of hub (1G).
BEWARE OF SHARP EDGES IN COUNTERBORE WHEN YOU REMOVE THE O-
RING.
16. Remove o-ring (5) from the counterbore in hub (1G). Dis-
card the o-ring.
17. At this point the main disassembly for drive hub is com-
plete.
Hub-Spindle Disassembly
NOTE: Start with large end of hub facing up, large end of spindle
facing down.
WEAR SAFETY GLASSES DURING THIS STEP.
1. Remove retaining ring (1I) from around spindle (1A) in
hub (1G).
2. Remove spacer (1H) from around spindle (1A) in hub
(1G).
3. Set hub (1G), small end/spindle facing down, up on
something that will support the hub’s flange while it lifts
hub up so spindle is not resting on anything. Carefully
press or hammer spindle (1A) down and out of hub (1G).
NOTE: If seal (1B) and bearing cone (1D) come out of hub and rest
on spindle, remove these parts from the spindle and set
them aside. Discard the seal.
4. If seal and bearing cone did not come out of the small
end of hub (1G) when spindle is pressed out of hub,
remove seal (1B) and bearing cone (1D) from the small
end of hub. Discard the seal.
5. Bearing cone (1F) should be lying loose in wide end of
hub (1G). Remove bearing cone (1F) from inside hub.
NOTE: If you use a punch and hammer, make sure you do not
strike the counterbore with the punch when you remove
the bearing cup.
6. Remove bearing cup (1C) from the counterbore in the
small end of hub (1G).
NOTE: If using a punch and hammer, make sure to not strike the
counterbore with the punch when removing the bearing
cup.
7. Turn hub (1G) over and lift it out of the flange-support.
Remove bearing cup (1E) from the counterbore in the
wide end of hub.
8. Turn hub (1G) over onto its small end. Remove two pipe
plugs (1J) from the two pipe plug holes in the side of
hub.
NOTE: If the unit does not have studs, skip this step:
9. Press the nine studs (1N) out of the stud holes in hub
(1G).
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