a. Cleaning. Clean exterior of all parts of brake
assembly with dry cleaning solvent, Federal
Specification P-D-680.
b. Inspection. Inspect all parts for excessive wear
or other damage. Inspect brake drum mounting bolts for
security.
34. BRAKE PRESSURE CONTROL ASSEMBLY
A screw-type brake pressure control assembly
(9, fig. 5) is conveniently mounted on the carrying arm
(30) and to the brake assembly. The purpose of the
brake pressure control assembly is to vary the brake
loading. Turning the control cap on the brake pressure
control assembly clockwise operates a plunger which
compresses a bellows containing hydraulic fluid. The
compressed fluid flows through a hydraulic line to the
brake shoe assembly (5) and applies equal pressure to
the brake shoes. Index marks and numbers on the
control cap enable the operator to make quick
Figure 15. Brake Pressure Control Assembly
adjustments for different or repetitive loads. A plug is
incorporated on the brake pressure control assembly for
36. TORQUEMETER
filling or bleeding the hydraulic system.
For convenience of operation and in order to
perform all tests for which the starter torque tester was
a. Servicing. Drain and fill the brake pressure
designed, three torquemeter assemblies are provided.
control assembly as follows:
The three instruments are similar in construction and
(1) Open lower plug on brake pressure
operating principle and vary only in their operating
control assembly and allow hydraulic fluid
range. One has a range of 0 to 150 foot-pounds in
to drain (fig. 15).
increments of 2 foot-pounds. The second torquemeter
has a range of 0 to 500 foot-pounds in increments of 10
(2) Close lower plug on brake pressure
foot-pounds. The third torquemeter has a range of 0 to
control assembly and open upper plug
1500 foot-pounds in increments of 20 foot-pounds. To
and fill with clean hydraulic fluid, Military
facilitate quick position change, the torquemeter is
Specification MIL-H-5606.
anchored to the carrying arm and the base with two
pivot pins secured with cotter pins.
b. Adjustments.
There are no adjustments
necessary on the brake pressure control assembly.
Caution: When testing starters, the
c. Inspection.
Inspect brake pressure control
high range (O to 1500 foot-pounds)
assembly for security and hydraulic leaks.
torquemeter must be used. However,
when testing actuators or retraction
35. GAGES
motors which have comparatively
Two types of gages are supplied with the starter
low
torque,
the
high
range
torque tester. A torquemeter (11, fig. 2) for checking
torquemeter must be replaced with a
the clutch setting(holding torque) and a tachometer (10)
low range torquemeter
for checking the cranking speed of the starter jaw. The
torquemeter is mounted on the right carrying arm of the
a. Cleaning.
Clean exterior of torquemeter,
starter torque tester when testing starters with right-hand
including glass cover, with dry cleaning solvent, Federal
rotation and mounted on the left carrying arm for testing
Specification P-D680.
starters with left-hand rotation.
The tachometer
indicates the speed of the starter jaw in either clockwise
b. Inspection. Inspect torquemeter for chipped or
or counterclockwise direction.
cracked glass cover, loose or bent indicator hand, and
leaks in the integral hydraulic system.
Note: The torquemeter is a sealed
unit which does not permit any
servicing in the field and must be
returned to the factory in the event of
failure.
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