JLG 450A II Series, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-8 – JLG Lift – 3121290
MAIN DISASSEMBLY for “B” Drives
1. Turn hub (1G) on side, Remove coupling (14) from wide
end of spindle (1A).
2. Mark location of shoulder bolt holes on outside of ring
gear and hub for easy realignment when rebuilding.
Remove four shoulder bolts (13) and 12 bolts (12) from
cover (6).
3. Remove 16 flat washers (16) from cover (6).
4. Lift cover sub-assembly (6) off ring gear (4). Set cover on
table with interior side facing up.
SHARP EDGES CAN CUT AND CAUSE SERIOUS INJURY. BEWARE OF SHARP
EDGES IN COUNTERBORE WHEN REMOVING O-RING.
5. Remove O-ring (5) from counterbore around edge of
cover (6A). Discard O-ring.
NOTE:
If O-ring is not in cover counter- bore, it is in ring gear coun-
terbore. Remove it from hub and discard.
6. Remove thrust washer (11) from counter- bore in top of
carrier (3A).
7. Remove input gear (8) from middle of carrier sub-assem-
bly (3).
8. Lift ring gear (4) off hub (1G).
9. Lift carrier sub-assembly (3) out of hub (1G).
10. Remove thrust spacer (9) from input shaft (7) in middle
of spindle (1A).
11. Lift input shaft sub-assembly (7) out of middle of spindle
(1A). Stand input shaft (7A) on splined end.
UNCONTROLLED OBJECTS CAN CAUSE EYE DAMAGE OR SERIOUS INJURY.
ALWAYS WEAR EYE PROTECTION.
12. Using retaining ring pliers, remove retaining ring (7B)
from 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).
16. Remove O-ring (5) from counterbore in hub (1G). Dis-
card O-ring.
17. Main disassembly for ”B” drives is complete.
Hub-Spindle Disassembly
NOTE:
Start with large end of hub facing up and large end of spin-
dle facing down.
UNCONTROLLED OBJECTS CAN CAUSE EYE DAMAGE OR SERIOUS INJURY.
ALWAYS WEAR EYE PROTECTION.
1. Remove retaining ring (1I) from around spindle (1A) ia
hub (1G).
2. Remove spacer (1H) from around spindle (1A) in hub
(1G).
3. Set hub (1G), with small end/spindle facing down, 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 spindle and set them
aside. Discard seal.
4. If seal and bearing cone did not come out of small end
of hub (1G) when you pressed spindle out of hub,
remove seal (1B) and bearing cone (1D) from small end
of hub (1G). Discard seal.
5. Bearing cone (1F) should be lying loose in wide end of
hub (1G). Remove bearing cone (1F) from inside hub
(1G).
NOTE:
Do not strike counterbore with punch if using a punch and
hammer when removing bearing cup.
6. Remove bearing cup (1C) from counterbore in small end
of hub (1G).
NOTE:
Do not strike counterbore with punch if using a punch and
hammer when removing bearing cup.
7. Turn hub (1G) over and lift it out of flange-support.
Remove bearing cup (1E) from counterbore in wide end
of hub (1G).
8. Turn hub (1G) over onto its small end. Remove two pipe
plugs (1J) from side of hub (1G).
NOTE:
If your unit does not have studs, skip this step.
9. Press nine studs (1N) out of stud holes in hub (1G).
10. Hub-spindle disassembly is complete.