STRUCTURAL CD3340B/YB4411
11-60
Published 04/07/2015 Control # 569-00
1. Slightly loosen the four capscrews securing the swing
gearbox (Figure 11-144).
2. With a spanner wrench, turn the eccentric ring until the
pinion tooth comes in contact with ring gear tooth (zero
backlash).
3. Tighten the four capscrews to proper torque.
4. Install the swing pinion cover.
Swing Gearbox Repair
(Units With S/N 109512-03 and After)
Removal
1. Rotate the boom slightly off center. Then, inhibit the
mast from turning, by blocking the boom or attach an
overhead crane.
2. Remove the front cover over the swing pinion.
3. Install an eyebolt with 1/2 NF threads into the tapped
hole on top of the swing pinion. Attach an overhead
crane and chain to the eyebolt.
4. Remove the swing motor (26, Figure 11-142) by
removing two capscrews (27) and lockwashers (11).
Remove gasket (25).
5. Clear any hoses or obstructions beneath the swing
gearbox that would inhibit the gearbox from being
lowered to the ground.
6. Remove four nuts (23, Figure 11-142), flat washers (22)
and capscrews (20).
7. Using the overhead crane, lower the gearbox to the
ground. Be sure to collect the four spacers (21) when the
gearbox is lowered. The eccentric ring will be removed
with the gearbox.
Disassembly
1. Remove the hydraulic motor.
2. Clean the outside of the gearbox before disassembly.
3. Loosen and remove capscrews (11, Figure 11-145).
Remove cover (6) and O-ring (10). Discard the O-ring.
4. Clean as much grease out of the gearbox housing as
possible. Properly discard the grease.
5. Remove two socket capscrews (19) and remove motor
end cap (22).
6. Remove and discard O-ring (21) and oil seal (2).
7. Remove four capscrews (31) and then remove cap end
(20) and shims (26, 29 and 30). Keep the shims together
as a set.
NOTE: Tie the shim set together to prevent any shim from
being lost.
8. Remove and discard O-ring (21) oil seal (28) from cap
end (20).
9. Bend the tabs down on washer (23) to free lock nut (27).
Remove lock nut (27), washer (23) and thrust washer
(13).
10. Using a suitable puller, remove bevel gear (9). Remove
two keys (14).
11. Remove pinion gear shaft (3) along with bearing cone
(15) and oil seal (7) out of housing (4). It may be
necessary to use a soft mallet to drive the pinion shaft
from the housing. At the same time, remove worm gear
and shaft (8) by removing it through the end cap opening
on the housing. Bearing cone (17) will pull out with worm
gear (8). Remove the bearing cones from the worm gear
shaft and the pinion shaft. Remove oil seal (7) from the
pinion shaft.
12. Remove bearing cone (15) from housing (4).
13. If necessary, using a suitable puller remove any
damaged bearing cups from the housing and end caps.
Inspection
Remove breather (34, Figure 11-145) and clean it in a
suitable solvent. Clean all other parts. See Section 1. Make
careful inspection of all parts, including gears, shafts and
bearings.
Replace all parts that have wear or damage. Make sure all
parts are clean and smooth.
Replace all seals and gaskets.
Coat all seals with a Lithium Base, E.P. No. 2 bearing grease.
Reference Only
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