SWING SERVICE MANUAL 1400A
6-4 1-21-2019 Control # 104-07
SWING GEARBOX AND BRAKE
The rotation drive is a double planetary gear reducer with an
integral brake. The gear reducer is designed to give long life
in heavy duty applications such as crane rotation. The
gearbox incorporates tapered roller bearings on the output
shaft and heavy duty bearings in the planet gears.
NOTE: Motor and cartridge valves are not serviceable in
the field. Return them to an authorized distributor
for service.
Disassembly & Assembly Instructions
If the rotation drive needs to be repaired, use the following
procedure for disassembly.
NOTE: The weight of the rotation gearbox with integral
brake and a hydraulic motor bolted on the input end
of the assembly is approximately 124 kg (275 lbs).
Tools Required
• Scribe or small punch
• Oil drain pan
• Eye bolts 1/4 in
• Retaining ring pliers
• Gear puller
• Ratchet wrench (1/2 in drive)
• 9/16 in socket (1/2 in drive)
• Socket for pinion nut (Whittet-Higgins P/N BAS-14)
• Soft hammer (brass or plastic)
• Press
• Drift rod (1/4 in to 3/8 in diameter)
• Torque wrench [1/2 in drive - approximately 135 N·m
(100 ft-lb)]
Parts Required to Rebuild
• Seals
• O-rings
• Back-up rings
• Parts to replace damaged or worn parts
• Locknut (9) and lockwasher (8)
Disassembly
(See Figure 6-2 for reference (#) numbers.)
1. With a scribe or small punch make a set of marks on the
brake assembly flange (15) and the top edge of the gear
housing (1) to aid in reassembly.
2. Remove both drain plugs (17) and drain the oil from the
unit. Drainage is facilitated when the oil is warm.
3. Remove the eight capscrews (16) holding the brake
assembly (15) onto the gear housing (1).
4. Lift the brake assembly (15) off of the gearbox. If
necessary, screw the hydraulic motor bolts into the
brake assembly for use as handles.
5. Remove the thrust washer (11) and input sun gear (14)
from the input planetary assembly (13).
6. Install three 1/4" eyebolts into the three planet pins of the
input planetary assembly (13) and with a small chain pull
the planet set (13) from the gear housing.
7. Remove the output sun gear (12) and thrust washer (11)
from the output planetary assembly (10).
8. Using the eyebolt/chain method outlined in step 6,
remove the output planetary assembly (10) from the
gear housing.
9. To remove the output shaft (2) from the gear housing (1),
bend the tab on the lockwasher (8) out of the slot in the
locknut (9). Loosen and remove the locknut (9) from the
output shaft (2).
10. Output shaft removal. Place the gear housing (1) on a
plate or table with a hole that allows the output shaft (2)
to extend through the hole. Press the output shaft out
the bottom of the case by applying a minimal load to the
threaded end of the output shaft until it passes through
the upper shaft bearing (6, 7).
The unit is now disassembled into groups of parts. The
area(s) requiring repair should be identified by thorough
inspection of the parts after they have been washed in
solvent, then refer to the appropriate group repair section.
Input Planetary Repair
(See Figure 6-2 for reference (#) numbers.)
1. Remove the retaining washers (26) from the planet pins.
2. Use a press to remove the planet pins (27) from the
carrier. Support the input carrier (13) to remove the
planet pins (27).
CAUTION
The locknut is no longer retaining the output shaft. Care
should be taken when moving the gear housing because
the output shaft can fall out.
Fo
r
Reference
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