SWING SYSTEM RT880E SERVICE MANUAL
6-8 Published 11-10-2014, Control # 524-00
Checking the Oil Level
1. Check the level on the dipstick on the swing gearbox.
2. If no oil is visible on the dipstick, add SSGL-5 weight oil
until the level is between min and max on the dipstick.
3. Replace the dipstick in the brake housing.
Testing
1. Test swing of superstructure in each direction. Stop and
start swing several times.
2. Inspect for hydraulic leaks and repair as necessary.
SWING BEARING
Description
The swing bearing is an anti-friction roller bearing that mates
the Superstructure to the Carrier. The bearing inner race is
bolted to the Superstructure and the outer race is bolted to
the Carrier. The inner race contains two grease fittings for
lubrication of the bearing which are hosed to two fittings at
the front right side of the turntable center section.
Maintenance
General
The swing bearing is the most critical maintenance point of
the crane. It is here, at the centerline of rotation, that
stresses of loads are concentrated. In addition, the bearing
provides the only attachment between the superstructure
and carrier. Therefore, proper care of the bearing and
periodic maintenance of the turntable-to-bearing attach bolts
-IS A MUST -to ensure safe and efficient operation.
Torquing Turntable Bolts
General
Maintaining proper torque value for bolts is extremely
important for structural strength, performance, and reliability
of the crane. Variations in torque can cause distortion,
binding, or complete separation of the superstructure from
the carrier. Refer to Fasteners and Torque Values, page 1-15
for information on the use of a torque wrench and torque
values or fasteners.
Proper identification of bolt grade is important. When marked
as a high strength bolt (grade 8 and metric grade 10.9), the
serviceman must be aware of bolt classifications and that he
is installing a high strength heat-treated tempered
component and the bolt must be installed according to
specifications. Special attention should be given to the
existence of lubricant and plating that will cause variation
from dry torque values. When a high strength bolt is
removed, or un-torqued, the bolt must be replaced with a
new bolt of the same classification.
If it is reported by the crane operator or suspected that the
crane has been overloaded beyond the capacities specified
above the bold line on the cranes’ capacity chart, then all
FIGURE 6-2
Dipstick Oil
Level
Breather Oil
Fill
Oil Drain
DANGER
Failure to maintain proper torque of the turntable bearing
attaching bolts will result in damage to the crane and
possible injury to personnel.
CAUTION
Repeated re-torquing may cause bolts to stretch. If bolts
keep working loose, they must be replaced with new bolts
of the proper grade and size.
DANGER
It is mandatory that bearing attaching bolts be inspected
for lack of torque and retorqued, as required, after the first
300 hours of crane operation. The bolts may loosen in
service due to vibration, shock-loads, and temperature
changes, therefore, periodic inspection should be
accomplished every 500 hours thereafter, ensuring the
bolts are properly torqued.
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