JLG 1350SJP Service Manual - Manual (Page 62)

SECTION 3 - CHASSIS & TURNTABLE
3-16 – JLG Lift – 3121142
3.11 DRIVE HUB (PRIOR TO S/N 100131)
The final drive consists of two planetary stages with an inte-
grated disconnect mechanism. Each stage incorporates a set
of matched planetary gears, which provide an equal load dis-
tribution. All torque transmitting components are made of
forged quenched and tempered high-alloy steels. External
gears are carburized. Precision roller bearings support the
sprocket or wheel loads. A shaft seal protects the unit against
contamination.
Disassembly
1. Position drive so that one of the fill holes is at the bot-
tom of the end cover and drain the oil.
2. Remove all bolts holding the motor and Remove motor
from drive.
3. Compress the spring (55) using a simple fixture or other
suitable device.
4. Remove snap ring (66) and release pressure on the
spring (55) until loose.
5. Remove the spring (55).
6. Turn unit so that cover (8) is in the up position.
7. Remove the screw plugs (21) and seal rings (22).
8. Remove “o” ring (33).
9. Remove the first stage planetary assembly (7).
10. Remove hex bolts (23).
11. Remove ring gear (30) and “o” ring (19).
12. Remove snap rings (15).
13. Pull off planet gears (1) together with cylindrical roller
bearings (11) from spindle (60).
NOTE: Further disassembly of the hub is discouraged. reinstalla-
tion of the shaft nut (4) requires a special tool and a torque
of 626 ft./ lbs. (876 Nm) for proper reassembly. These com-
ponents Will Fail if not properly reassembled.
14. Inspect the planetary stage assemblies as complete
units. Thoroughly clean and check both the gearing and
the bearings for damage and apply new oil. If the gears
or bearings need replacing, they must be replaced as
complete sets.
15. The first stage planetary gears (2) must be changed in
sets of three pieces.
16. The first stage planetary gears (2) must be changed as a
complete set of three and JLG recommends changing
the sun gear shaft (43) along with this set of planets.
17. The second stage planetary bearings (11) must be
replaced in sets of four pieces.
18. The second stage planetary gears (1) must be changed
as a complete set of four and JLG recommends changing
the sun gear (3) along with this set of planets.
Disassembly of Cover
Loosen and remove hex head bolts (53) to remove cover (51).
Disassembly of the First Stage Planetary
Assembly (7)
1. Push sun gear shaft (43) out of the first stage.
2. Remove snap rings (14).
3. Press planet pins (5) out of the planet gears (2).
4. Pull cylindrical roller bearing (10) out of the planet gears
(2).
5. Remove snap ring (16) from sun gear (3) and Remove
planet carrier (7) from sun gear (3).
Disassembly of Second Stage Planet Gears (1)
Press cylindrical roller bearings out of planet gears (1).