JLG 120-SXJ ANSI Service Manual - Manual (Page 37)

SECTION 3 - CHASSIS & TURNTABLE
3121105 – JLG Lift – 3-9
Swing Bearing Torque Values
1. Outer Race - 240 ft.lbs. (325 Nm) Loctite, 170 ft.lbs.
(230 Nm) wet, 220 ft.lbs. (298 Nm) dry.
2. Inner Race - 240 ft.lbs. (325 Nm) Loctite, 170 ft.lbs.
(230 Nm) wet, 220 ft.lbs. (298 Nm) dry.
3. Swing Bearing Torquing Sequence, Figure 3-6.,
Swing Bearing Bolt Torquing Sequence
RETORQUE INNER AND OUTER SWING BEARING BOLTS TO 220
FT.LBS. (298 NM) AFTER FIRST 200 HOURS OF OPERATION AND
EVERY 500 HOURS THEREAFTER.
3.3 SWING TORQUE HUB
Disassembly
1. Remove oil plugs (25 and 26) and drain oil from unit
into a suitable container. Replace drain plugs.
NOTE: The screws, hub pinion gear, and retaining plate ref-
erenced in steps (2) and (3) are not shown in Figure
2-20, but are attached to the hub output shaft (item
30).
2. Remove the two screws which attach the hub pinion
gear retaining plate and remove plate.
3. Carefully remove pinion gear from splined hub out-
put shaft.
4. Using suitable protection, clamp drive hub assembly
in a vise or suitable holding fixture.
5. Remove four shoulder bolts (3) and lockwashers (4)
from counterbored holes in cover of drive hub
assembly.
6. Remove remaining eight bolts (2) which attach cover
(1) to ring gear 7.
7. Carefully remove cover assembly (1) from input gear
(18) together with outer thrust washers (8) and thrust
bearing 9. Remove and discard outer o-ring (6).
8. Remove thrust washer (17) from small diameter of
input gear (18).
9. Carefully withdraw input gear (18) from cluster gear
(11) and output shaft (30).
10. Rotate ring gear (7) and check that each of the three
cluster gears (11) incorporates a punched timing
mark.
11. Carefully withdraw ring gear (7) from assembly.
12. Carefully withdraw carrier assembly (10) from inter-
nal gear (19).
13. Remove and discard inner o-ring (6).
14. Remove inner thrust washers (8) and thrust bearing
(9) from counterbore in carrier assembly 10.
15. Carefully withdraw internal gear (19) from output
shaft (30).
16. If necessary, disassemble planet carrier assembly
(10) as follows:
a. Remove three pins (16) by gently tapping a suit-
able punch against the roll pin until the pin is
driven into planet shaft (15).
b. Using a suitable drift, carefully and gently tap
shafts (15) from carrier (10), ensuring that nee-
dle rollers (13) on each shaft are not damaged
or lost.
c. Lift cluster gears (11) from carrier (10) and
remove thrust washers (12), needle rollers (13)
and roller spacer (14).
d. Drive roll pins (16) from shafts (15) and discard
pins.
17. If necessary, disassemble hub and shaft assembly
(24) as follows:
a. Using suitable snap ring pliers, remove retaining
ring (20) from groove in output shaft (30).
b. Remove spacer shim (21) from output shaft.
c. Place hub in a suitable hand-operated hydraulic
press with external portion of shaft (30) down
and with suitable block supporting hub (24).
d. Using suitable protection between inner end of
shaft (30) and press cylinder drift, operate press
and carefully press shaft from inner bearing
assembly (22 and 23).
e. Remove seal (29) from shaft and discard seal.
f. Remove bearing cone (22) from cup (23).
g. Using press, remove bearing cups (23 and 27)
from hub (24) and cone (28) from shaft (30).
Cleaning and Inspection
1. Clean all parts thoroughly in an approved cleaning
solvent.
2. Inspect bearing components (22, 23, 27, 28) for
damage, pitting, corrosion or excessive wear.
Replace bearings as a complete set if necessary.
3. Inspect all thrust washers for scoring or excessive
wear.
4. Inspect all geared or splined components for
chipped or broken teeth and for excessive or
uneven wear patterns.