SECTION 5 – SWING DRIVE
3120933 Rev. 0 USTC 5-7
11. Counterbored holes should be centerd between
planet gears. Slowly press secondary carrier
assembly down tightly against output shaft.
12. While secondary carrier assembly is under press
load (approximately 2 tons), rotate case by
hand. If correct number of shims are in unit to
give proper shaft bearing preload, torque re-
quired to turn case should be 50-80 lb-in.
13. Remove press load from secondarhy carrier.
Install bolts and torque to 70-75 lb-ft.
14. Press splined end of sun gear into spline on
bottom side of primary carrier.
15. Turn primary carrier assembly over (sun gear
down). Install assembly into unit until sun gear
teeth mesh with secondary planet gears. Primary
carrier assembly will slide down to where pri-
mary planet gears touch top of gear teeth in
case. Hold inside diameter of carrier and rotate
until planet gears line up with case gear teeth.
Assembly will drop down.
16. Install input thrust washer over step of input
gear. Insert input gear into unit so teeth mesh
with primary planet gears.
17. Replace o-ring seal on bottom of cover.
18. Set cover on top of unit and rotate until oil fill
hole is in proper orienteation to oil drain hole in
case. Install cover bolts and loackwashers.
Torque bolts to 32 lb-ft.
19. Ensure magnetic plug is secured in case.
20. Fill unit with 2.5 pints of extreme pressure gear
lubricant. Correct oil level will measuer to
middle of primary planet gear.
21. Put pipe sealant on magnetic plug and install
into oil fill hole in cover.
22. Stick a shaft into input gear and turn by hand to
be sure unit runs smoothly and easily.
SWING BEARING
The swing bearing carries all the load from the boom.
The bearing is manufactured with a certain clearance
which must be maintained to obtain a smooth rotation
with low torque requirements. Bearing mounting
bolts must also be monitored to ensure safe operation
of the crane.
Bolt Replacement, Torque Procedure
WARNING: DO NOT REUSE TURNTABLE
BEARING BOLTS. ALWAYS REPLACE ALL
BOLTS AND HARDENED WASHERS
ANYTIME A BOLT HAS BEEN REMOVED.
USE ONLY UNBRAKO LOC-WEL PATCH
BOLTS AND SPECIAL HARDENED
WASHERS OBTAINED FROM USTC, INC.
IMPORTANT: Re-torque swing bearing bolts after
the first 200 hours of operation and then at 500
hour intervals thereafter.
New bearing bolts are required when the bearing is
removed, or if bolts are found to be stretched. If bolts
are found to be missing, all bolts should be replaced.
The recommended bolts are a special hardness and
include a patch with a thread locker. As the bolt is
turned into the hole, the patch opens, distributing the
correct amount of thread locker on the threads. It is
not necessary to lubricate or use any other type of
thread locker on the bolts.
To prevent twisting the bearing to one side, the bear-
ing bolts need to be tightened in a specific sequence.
Use a torque multiplier to effectively access and
torque all bolts.
When new bearing bolts are installed:
1. Insert bolts in holes.
2. Following sequence in Figure 5-5, tighten all
bolts to 180 lb-ft. (244 Nm) in sequence.
3. Repeat step 2, tightening to 472 lb-ft. (640 Nm).
Courtesy of Crane.Market
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