National Crane 03-20-19 Control # 613-06 5-1
NBT30H-2 SERVICE MANUAL HOIST
SECTION 5
HOIST
SECTION CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Warm-up Procedure . . . . . . . . . . . . . . . . . . . . . . . 5-2
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Hoist Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Hoist Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Hoist Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Planetary Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
DESCRIPTION
The NBT30H-2 hoist is composed of motor control valve, a
fixed displacement hydraulic motor, a multiple disc brake,
and a pair of planetary gear sets.
The multiple disc brake is spring applied and hydraulically
released through a port in the brake housing. An overrunning
clutch allows the hoist to raise the load without releasing the
brake while at the same time holding the load until there is
sufficient pressure to release the brake when hoisting down.
To Next Page
Loading...
Need help?
General
