Manitowoc National Crane NBT30H-2, Service Manual

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5
10
National Crane
03-20-19 Control # 613-06
5-3
NBT30H-2 SERVICE MANUAL HOIST
5. Reinstall the hydraulic hoses as per removal tags.
HOIST REPAIR
Disassembly
The following steps describe how to disassemble the hoist.
Inspect and replace all worn parts.
1. Stand the hoist on its end with the motor pointing up.
Place blocking under the side plate so the hoist is not
sitting on the shaft (Figure 5-2).
NOTE: See Figure 5-4 for item number identification.
2. Remove the brake hose (46) from the straight
adapter (45).
3. Remove the motor and counterbalance assembly from
the hoist by removing two capscrews (47) and two
lockwashers holding the motor (44) to the brake cover
(20). See
Motor , page 5-8 for motor and counterbalance
valve disassembly.
4. Remove the brake sub-assembly from the hoist by
removing the eight capscrews (9) holding the brake
housing to the side plate (41). Re-install two of these
capscrews into the two extra tapped holes and tighten
them evenly until the brake housing is loose from the
side plate. Take note of the vent (30) location for
reassembly. See
Brake , page 5-4 for brake repair.
5. Remove the side plate (41) by removing the three
capscrews (1).
6. Lift the bearing carrier (26) from the drum. If necessary
remove and replace the bearing (28) and seal (306).
7. Remove the input sun gear (8) and thrust washer (6)
from the input planet assembly (36).
8. Remove the input planet set (36) from the drum. Inspect
the planet set for wear. See Servicing The Planetary Set
section for disassembly and repair.
9. Remove the output sun gear (16) and thrust washer (6)
from the output planet assembly (4).
10. Remove the output planet set (4) from the cable drum.
Inspect the planet set for wear. See Servicing The
Planetary Set section for disassembly and repair.
11. Remove the cable drum (5) and inspect the gear teeth
for excessive wear. Remove and replace the bearing
(28) and seal (306) located in the drum.
12. Inspect retaining ring (48) to insure it is still in groove
and is not bent over.
13. If necessary remove output shaft (32) from side plate
(29) by removing six capscrews (3) holding sideplate
(29) to shaft (32). Take note of vent (30) location for
reassembly.
Reassembly
NOTE: See Figure 5-4 for item number identification.
1. Thoroughly clean all parts. Replace those that show
wear or damage.
2. Inspect the cable drum (5) for structural integrity and
replace if necessary.
3. Attach the shaft (32) to the side plate (29) using the six
capscrews (3). Make sure the vent (30) is oriented
properly. Torque the capscrews to recommended
values, refer to
Fasteners and Torque Values , page 1-
12.
4. Install retaining the ring (48) onto the shaft (32)
5. Lay the unit down with the rods (2) pointing up. Support
the side plate (29) with blocking (Figure 5-2) so that the
hoist is not setting on shaft (32).
6. Set cable drum (5) onto shaft (32) and seat drum on
bearing (28). Be careful not to damage seal (306).
7. Install the output planet set (4).
8. Install the output sun gear (16) into the output planet set.
9. Install the thrust washer (6) into the output planet set.
10. Install the input planet set (36) into the drum. Make sure
that it fits over the output sun gear (16).
11. Install the input sun gear (8) and thrust washer (6) into
the input planet set.
12. Install the thrust washer (6) into the input planet set.
13. Install a new O-ring (304) and if necessary bearing (28)
& seal (306) into the bearing carrier (26). Grease the
O-ring and seal then install the bearing carrier into the
drum.
FIGURE 5-2