Band Brake Operation
For actuation of the band brake, the valve on the hand pump (31-E) must be positioned for retraction of the band
brake cylinder (31-D). Pump up the pressure to retract the piston into the cylinder and tighten the band on the drum.
Continued pressure must be applied until the drum has stopped. Observe the pressure gauge (7A), and ensure that the
pressure does not exceed 4,000 psi. Move the hand pump valve to the neutral position to lock the cylinder in position.
If a *runaway" drum condition exists, and the band brake begins to smoke, either fresh water or salt water must
be sprayed on the band brake to the cool the area. The band brake material, type RBW woven lining at a friction
coefficient of 0.4, has the following ratings:
- 7,500 ft/min maximum speed
- 750° F maximum temperature
- 300 psi maximum pressure.
When releasing the band brake, position the valve for extension of the cylinder. Pump the cylinder out until
there is a slight clearance between the brake material and the drum. This clearance can be visually observed from the
hand pump area.