MAINTENANCE OF THE M113 PER CARRIER - OD1601 LESSON 1/TASK 1
The two brake assemblies are identical except that on assembly A, a 1/8 inch spacer
is installed between the two housings as required to provide a larger gap for
larger brake disks used on some carriers.
When hydraulic pressure from the brake cylinder is applied to each brake housing,
fluid is forced under pressure through a small opening in the housing to force the
release unit piston and lining in the direction of brake application. The amount
of piston movement depends upon the amount of fluid pressure applied, and upon the
action of wave washers inside the release unit.
The piston starts to move at a
pressure of 20 to 40 psi.
Upon release of pressure, the wave washers pull the
piston and lining away from the brake disk.
The master cylinder contains a low
pressure piston, high pressure piston, and relief valve. When actuated manually by
means of linkage, the pistons compress the hydraulic fluid, causing a rise in
hydraulic pressure in the fluid lines to the brake assembly.
The relief valve
prevents pressure from exceeding a preset level.
3.
Conclusion
In this task, the principles of operation of the M113A1/A2 powerplant, fuel,
electrical, and brake systems were discussed.
In the next task, preventative
maintenance checks and services (PMCS) of these various systems will be presented.
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