SECTION 3 - CHASSIS & TURNTABLE
3121171
3-17
3.13
DRIVE HUB - IF EQUIPPED WITH REXROTH
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 bottom of
end cover and drain oil.
2.
Remove all bolts holding the motor. Remove motor from
drive.
3.
Compress spring (55) using a simple fixture or other suit-
able device.
4.
Remove snap ring (66) and release pressure on spring
(55) until loose.
5.
Remove spring (55).
6.
Turn unit so that cover (8) is in the up position.
7.
Remove screw plugs (21) and seal rings (22).
8.
Remove O-ring (33).
9.
Remove first stage planetary assembly (7).
10.
Remove hex bolts (23).
12.
Remove ring gear (30) and O-ring (19).
13.
Remove snap rings (15).
14.
Pull off planet gears (1) together with cylindrical roller
bearings (11) from spindle (60).
FURTHER DISASSEMBLY OF HUB IS DISCOURAGED. REINSTALLATION OF
SHAFT NUT (4) REQUIRES A SPECIAL TOOL AND A TORQUE OF 626 FT-LB (876
NM) FOR PROPER REASSEMBLY. THESE COMPONENTS WILL FAIL IF NOT PROP-
ERLY REASSEMBLED.
15.
Inspect planetary stage assemblies as complete units.
Thoroughly clean and check gearing and the bearings
for damage and apply new oil. If gears or bearings need
replacing, they must be replaced as complete sets.
16.
First stage planetary gears (2)
must
be changed in sets of
three pieces.
17.
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.
18.
The second stage planetary bearings (11)
must
be
replaced in sets of four pieces.
19.
The second stage planetary gears (1)
must
be changed
as a complete set of four. JLG recommends changing the
sun gear (3) along with this set of planets.
Cover Disassembly
Loosen and remove hex head bolts (53) to remove cover (51).
First Stage Planetary (7) Disassembly
1.
Push sun gear shaft (43) out of first stage.
2.
Remove snap rings (14).
3.
Press planet pins (5) out of planet gears (2).
4.
Pull cylindrical roller bearing (10) out of planet gears (2).
5.
Remove snap ring (16) from sun gear (3). Remove planet
carrier (7) from sun gear (3).
Second Stage Planet Gears (1) Disassembly
Press cylindrical roller bearings out of planet gears (1).
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