STRUCTURALS
CD5515-2/YB5515-2 SERVICE MANUAL
11-26
Published 1-20-2017, Control# 483-02
4.
Raise the boom to its full raised position and record the
amount of movement on the dial indicator.
5.
Lower the boom and then rotate it 180°. Repeat steps 2
though 4.
6.
Average the two readings. The maximum allowable
movement is 1.52 mm (0.060 in). The mast bearing must
be replaced if the movement is greater than the stated
measurement.
Replacing the Mast Bearing
Removal
1.
Refer to boom removal in this section and remove the
boom from the mast.
2.
Remove swivel stop (36, Figure 11-23) from the bottom
of the hydraulic swivel (15).
3.
Attach tags to the hydraulic hoses and lines with the
swivel port number to which they connect.
4.
Disconnect the hydraulic lines from the lower swivel
ports. Put caps or plugs on the fittings and hydraulic
lines.
5.
Using an overhead crane, remove the counterweight (2)
from the mast.
6.
Refer to hoist removal in this section and remove the
hoist assembly.
7.
Connect a hoist to the mast capable of handling the
weight of the mast. Remove the 26 bolts (16) and flat
washers (17), which fasten the mast to the mast bearing.
8.
Remove the mast and place it on blocks.
9.
Remove the 26 bolts (18) and flat washers (17) and
remove the mast bearing (19) from the frame.
Installation
1.
Using a suitable solvent, clean the holes in the bearing
plate on the main frame. Remove the residue with
compressed air. Clean all dirt from the bearing plate.
2.
Locate the mast bearing (19, Figure 11-23) in place on
the bearing plate.
3.
Install the bolts (18) and flat washers (17) to fasten the
mast bearing to the bearing plate.
4.
Figure 11-20 shows order of tightening the bolts. Each
bolt must first be tightened to a torque of 754 to 816 Nm
(556 to 602 lb-ft) and then loosened slightly. After which,
each bolt must again be torqued to 754 to 816 Nm (556
to 602 lb-ft).
NOTE:
For ease of lubrication when turntable mast is
removed, apply grease to grease fittings located on
the bearing before mounting the turntable mast to
the bearing. Reference
for lubrication procedure.
5.
Make sure the top surface of the mast bearing and the
bottom surface of the mast base are clean.
6.
With a hoist, raise and then lower the mast into position
over the mast bearing. Install bolts (16, Figure 11-23)
and washers (17).
7.
Figure 11-20 shows the order for tightening the bolts.
Each bolt must first be tightened to a torque of 754 to
816 Nm (556 to 602 lb-ft), and then loosened slightly.
After which, each bolt must again be tightened to a
torque of 754 to 816 Nm (556 to 602 lb-ft).
8.
Install swivel stop (36, Figure 11-23) to hydraulic swivel
(15).
9.
Connect the hydraulic lines to the hydraulic swivel.
10.
Install counterweight (2) onto the mast.
11.
Install the hoist assembly to the mast.
12.
Install the boom assembly.
Swing Gearbox and Pinion
Maintenance
Gearbox
The swing gearbox has a worm gear set which rotates on
taper roller bearings. The gears and bearings are given
lubrication by the grease in the gearbox. Gaskets inhibit
external leakage from the gearbox. Keep the gear case filled
with grease.
Swing Gear/Pinion
The swing pinion and gear must be lubricated at regular
intervals.
FIGURE 11-21
p0222
Reference Only
