position promptly and without binding.
otherwise the diaphragm, flange
Check push rod travel to be sure it is at a
sealing surface, or clamping ring
minimum without brakes dragging.
could be destroyed.
(3) With a full pressure application, check the
brake chamber for leakage.
Maximum push rod stroke at which
brakes should be readjusted is 2 1/4
If leakage is detected around the
flange, or clamping ring, the bolts
should be tightened evenly but only
Section VIII. DIFFERENTIAL LOCKOUT POWER CLUSTER ASSEMBLY
b. Inspection and Repair.
Applied air is admitted through the inlet port in the
(1) Inspect the air cylinder body for scratches,
cylinder body. Pressure is exerted against the piston
dents, or other damage which would
face, forcing piston and rod to move toward the
cause damage to piston cup. Replace a
hydraulic cylinder and actuate it. Piston travel also
defective cylinder body.
compresses the piston return spring. The piston carries
(2) Inspect piston for tightness on rod.
a piston cap, which seals against the cylinder body wall
Replace defective piston.
to prevent pressure leaks past the piston, and a felt
(3) Inspect the piston cup for wear or
wiper, which cleans and lubricates the body wall ahead
distortion. Replace a defective piston
of the piston. Piston movement changes the cylinder
volume on the atmospheric side of the piston causing air
movement through a filter breather port located in the
(4) Inspect the boot and spring for cracks,
cylinder head. The power cluster applies air pressure
breaks, and loss of spring tension.
over hydraulic fluid activating the hydraulic system on
Replace defective parts.
the differential and transfer case lockout clutches.
(5) Replace or repair any worn, damaged, or
Power Cluster Assembly Removal
Power Cluster Assembly Reassembly and
Remove the power cluster as
a. Reassembly. Reassemble the power cluster
b. Disassembly. Disassemble the power cluster
assembly in reverse of the numerical sequence
assembly in numerical sequence as illustrated on figure
Piston must be tight on rod and at
139. Power Cluster Assembly Cleaning, Inspection,
right angles to rod center line.
b. Installation. Install the power cluster assembly
a. Cleaning. Clean all parts with an approved
cleaning solvent and dry thoroughly.