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BRAKE CYLINDER PRESSURE TEST
1. Install the –4 JIC tting into the brake release port.
Connect a hand pump with accurate 0-2000 PSI
(0-13,800 kPa) gauge and shut-o valve to this tting.
Apply 1000 PSI (68.9 bar) to the brake. Close shut-o
valve and let stand for ve (5) minutes. If there is any
loss of pressure in ve (5) minutes, the brake cylinder
should be disassembled for inspection of the sealing
surfaces and brake piston.
2. WHILE PRESSURE IS APPLIED AND THE BRAKE
RELEASED, install the brake clutch assembly in the
brake pack, short end of the inner race toward motor.
Turn the clutch back and forth as you align the outer
race splines with the brake disc splines.
3. Release the pressure on the brake cylinder then
remove the brake clutch assembly. The brake cylinder
assembly is now complete and ready to be installed in
the hoist.
8. Install pressure plate into brake cylinder followed by
the piston backup ring. The close-tting piston backup
ring may be depressed slightly to one side to lodge the
backup ring in the brake cylinder bore and temporarily
hold the pressure plate and springs in place while you
lower the brake cylinder over the motor support.
9. Apply petroleum jelly to the entire sealing surface of
the brake cylinder and to the piston seal. Install the
brake cylinder over the motor support being careful
to avoid damaging the piston seal or motor support
O-ring. (A press may be necessary to avoid cocking
the brake cylinder during installation.)
10. Install motor support capscrews and evenly tighten to
recommended torque.
MOTOR SUPPORT — BRAKE CYLINDER SERVICE
Always use the molded spring spacer with the new brake
cylinder. The brake springs must be properly positioned by the
spring spacer. Failure to install the spring spacer may allow
the springs to contact each other and become damaged. This
could result in loss of load control, property damage, injury or
death.
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