Manitowoc Grove CD3340B User Manual

GROVE 11-57
CD3340B/YB4411 STRUCTURAL
11
Published 04/07/2015 Control # 569-00
Inspection for Bearing Wear
Because of conservative design parameters, static loading
and slow intermittent rotation, there are very few mast
bearings that ever see their full design use.
However, the mast does have moving internal parts that are
prone to wear if not properly maintained. As the bearing
wears, there will be free-play or movement in the bearing.
Some of the symptoms of mast bearing wear are:
• Metal particles in the grease around the seal.
• Increased drive power required.
• Noisy rotation.
• Rough rotation.
If one or more of the above symptoms are evident, the
following procedure should be used to check the bearing for
excessive wear:
1. On a level, hard packed surface, set the crane up level
on its outriggers.
2. Place the boom in forward horizontal position. Fully
extend the booms.
3. Place a dial indicator on the swing gearbox cover and
mast as shown in Figure 11-141.
4. Set the dial indicator to zero.
5. Raise the boom to its full upright position and record the
amount of movement on the dial indicator.
6. Rotate the boom 180° and repeat steps 2 thru 5.
7. Average the two readings. The maximum allowable
movement is 0.91 mm (0.035 in). The mast bearing must
be replaced if the movement is greater than the
maximum allowable movement.
Replacing the Mast Bearing
Removal
1. See boom removal and remove the boom from the mast.
2. Disconnect the lift cylinder hoses. Plug/cap the hoses
and cylinder ports. Remove the lift cylinder.
3. Put tags on the upper swivel hydraulic hoses and lines
with the swivel port to which the hydraulic hose or line
connects.
4. Disconnect the hydraulic hoses and lines from the upper
swivel ports. Put caps or plugs on the fittings and
hydraulic lines and hoses.
5. Remove swivel stop (39, Figure 11-142) from the bottom
of hydraulic swivel (38) and support the swivel in place.
Remove bolts (53) and washers (1).
6. Connect a hoist capable of handling the weight of the
mast. Remove the 22 capscrews (18) and structural
washers (19) that fasten mast (9) to mast bearing (30).
7. Remove the mast (9) and place on blocks.
8. Remove the 24 capscrews (31) and structural washers
(6) and remove the mast bearing (30).
P0814
FIGURE 11-141
Reference Only

Manitowoc Grove CD3340B Specifications

General

Brand	Manitowoc
Model	Grove CD3340B
Category	Construction Equipment
Language	English