14
CAPSTAN DRIVE SERVICE
Foreword to Drive Service
Before any part is removed from the capstan drive, all
service instructions should be read and understood.
Work in a clean, dust free area as cleanliness is of utmost
importance when servicing hydraulic equipment.
Inspect all replacement parts prior to installation to detect
any damage which might have occurred in shipment.
Use only genuine BRADEN replacement parts for opti-
mum results. Never reuse expendable parts such as oil
seals and O-rings.
Inspect all machined surfaces for excessive wear or dam-
age before beginning to reassemble the drive.
Lubricate all O-rings and oil seals with gear oil prior to
installation.
Use a non-hardening sealing compound on the outside
surface of oil seals and a light coat of thread sealing
compound on pipe threads. Avoid getting thread com-
pound inside parts or passages that conduct oil.
Thoroughly clean all parts in a good grade of non-flam-
mable safety solvent. Wear protective clothing as
required.
Refer to exploded view drawing in the center of this man-
ual for item numbers used in service procedures.
DRIVE DISASSEMBLY
1. Disconnect and remove the hose (item 43) between
the brake valve block and the brake cylinder. Remove
the two capscrews holding the motor to the motor sup-
port and remove the motor. Remove and discard the
motor pilot O-ring. Remove one of the oil drain plugs
(item 40) and drain the gear oil into a suitable container.
2. The four capscrews holding the motor support to the
brake cylinder should be evenly removed in 1 or 2 turn
increments since the motor adapter is under spring
tension. Mark the relative position of the motor support
to the brake cylinder. This will assure the motor will be
correctly positioned when the unit is re-assembled.
3. Remove the motor support, complete static brake
assembly, brake coupling (item 31) and all other parts
inside the brake cylinder (item 2). Remove and discard
the O-ring and backup ring (items 29 & 30) and the brake
piston seal (item 26).
4. Remove the six (6) capscrews holding the brake cylin-
der to the main housing (item 1). Mark the relative posi-
tion of the brake cylinder to the main housing. This will
assure the brake release port will be correctly positioned
when the unit is re-assembled.
DO NOT CLEAN BRAKE FRICTION DISCS
IN SOLVENT. SOLVENT MAY CAUSE DAMAGE
TO FRICTION MATERIAL WHICH MAY RESULT
IN BRAKE FAILURE AND LOSS OF LOAD
CONTROL.
