PROPEL BRAKES
SUBSECTION 9C
Figure 9C-2. Propel Brake (15Z499)
3. Rotating discs should be clean and dry. There should be
7. Remove piston (14) from plate (19) by introducing low
no presence of oil on any lining material on mating sur-
pressure air (15 psi) into the hydraulic inlet. Make sure the
faces of the stationary discs. Worn or heavily scored lining
piston is directed away from all personnel.
material must be replaced.
8. Slide O-rings (16 and 18) and back-up rings (15 and 17)
4. Inspect the springs for cracks or distortion and make
from the piston grooves. The back-up rings will be dam-
sure they are all the same length.
aged during removal and should not be removed if replace-
ment is not planned.
5. Inspect the shaft for cracks or other damage.
9. Remove retaining ring (25) and tap bearing (24) out of
6. Replace all seals, O-rings, and back-up rings that have
plate (19).
been removed. If the brake has been disassembled to re-
place O-rings, it is recommended that the discs also be
CLEANING. INSPECTION AND REPAIR. Prior to assembly,
replaced.
perform the following procedures:
ASSEMBLY. To assemble the propel brake, proceed as fol-
1. Clean all components in a suitable cleaning solvent and
lows (see Figure 9C-2):
dry thoroughly. Do not clean the discs or plates in solvent.
1. Lubricate the piston, O-rings, back-up rings and the cyl-
2. Inspect the piston and housing for excessive wear or
inder of plate (19) with fluid from the propel brake system.
deep scratches.
9C-2
