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 TM 55-1905-219-14-4
3-9.6. HYDROSTARTER DEACTIVATE SWITCH - MAINTENANCE INSTRUCTIONS.
a.
The hydrostarter deactivate switch is identical to the lubricating oil pressure switch. The swtch is used
i
to deactivate the starting solenoid when the engine is running. This will prevent accidental engagement of the
hydrostarter.
b.
The lubricating oil pressure switch is of the "break" type. The lubricating oil pressure switch is calibrated
2
to break contact when the lubricating oil pressure increases to 10 psi (7.03 gm cm ). The phrase "10-BREAK"
is stamped on the switch cover.
c.
As the lubricating oil pressure increases when the engine starts, the diaphragm in the switch body
expands and forces the plunger upwards. Since the bottom of the adjusting screw bears against the plunger
and the adjusting screw is attached to the bracket which controls the upper breaker point arm, the arm is also
2
forced upwards. When the lubricating oil pressure increases to 10 psi (7.03 gm cm ), the points separate. If the
2
lubricating oil pressure decreases to 10 psi (7.03 gm cm ) during operation, the breaker point will close.
This task covers:
a.
Testing
c.
Removal
b.
Adjustment
d.
Installation
INITIAL SETUP
Test Equipment
References
NONE
NONE
Special Tools
NONE
Equipment
Condition
Condition Description
NONE
Material/Parts
Special Environmental Conditions
NONE
NONE
Personnel Required
General Safety Instructions
2
NONE
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