JLG 4394RT Service Manual - Manual (Page 67)

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121249 – JLG Lift – 3-31
Main Disassembly for Drive Hub
NOTE: Refer to Figure 3-7. 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
middle 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).
Discard the o-ring.
17. At this point the main disassembly for drive hub is
complete.
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 remov-
ing the bearing cup.
7. Turn hub (1G) over and lift it out of the flange-sup-
port. Remove bearing cup (1E) from the counterbore
in the wide end of hub.