Hoist Service; Hoist Disassembly - BRADEN BG4A Installation Maintenance And Service Manual

HOIST SERVICE

FOREWORD TO HOIST SERVICE
Before any part is removed from the hoist, all service instruc-
tions should be read and understood.
Work in a clean, dust free area as cleanliness is of utmost
importance when servicing hydraulic equipment.
Remove wire rope prior to removing hoist from crane.
Inspect all replacement parts, prior to installation, to detect
any damage which might have occurred in shipment.
Use only genuine BRADEN replacement parts for optimum
results. Never reuse expendable parts such as oil seals and
O-rings.
Inspect all machined surfaces for excessive wear or dam-
age...before reassembly operations are begun.
Lubricate all O-rings and oil seals with gear oil prior to instal-
lation.
Use a sealing compound on the outside surface of oil seals
and a light coat of thread sealing compound on pipe threads.
Avoid getting thread compound inside parts or passages
which conduct oil.
Thoroughly clean all parts in a good grade of non-flammable
safety solvent. Wear protective clothing as required.
Refer to exploded view drawing for item numbers used in
service procedures.
• Perform all applicable trouble shooting operations BE-
FORE disassembling hoist. To identify specific parts by part
number, refer to BG4 material list.

HOIST DISASSEMBLY

1. Disconnect all hoses and fittings from the motor.
WARNING
CAUTION
!
DO NOT clean brake friction disks in solvent. Solvent may
cause damage to friction material which may result in brake
failure and loss of load control.
2. Stand the hoist on the bearing support plate. Remove the
brake release tube assembly (42) between the brake valve
block and the brake cylinder end plate. Remove the cap-
screws (47) and lockwashers (48) which secure the motor
(49) to the motor adapter (38), and lift the motor out of the
motor adapter. Remove and discard the gasket installed on
the pilot of the motor.
3. Remove the brake coupling (29) and sun gear (41) from
the hoist.
4. Remove the four capscrews (5) and lockwashers (6) hold-
ing the tieplates (4) to the brake cylinder endplate. The drum
is supported on the endplate by a large bushing. Carefully
separate the endplate assembly from the drum. The end-
plate assembly includes the static brake cylinder. Remove
the brake cylinder endplate from the drum.
!
5. Remove the other four capscrews and lockwashers hold-
ing the tieplates to the bearing support endplate. Remove
the planet assembly from the drum and separate the drum
from the bearing support endplate.
16