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3-50 DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE
Lubrication System
Oil Level Sensor Switch
If the oil level becomes lower than the preset value, the sensor switch
[A] closes. As a result, the base current [IB1] passes through the Zener
diode [Z1] and the resistor [R12] to flow to [TR1] to maintain the circuit.
The base current [IB1] is held by the amplified collector current [IC1],
and as a result, the spark current does not generate, causing the engine
to stop. (Refer to the section on Ignition System for comparison.)
A: Oil Level Sensor Switch
ESW: Engine Switch
Inspection method
•
Verify that the oil level of the engine is normal.
•
Disconnect the wire from the oil level sensor terminal.
•
Set the measurement range of the tester to R 1 and connect one
of the tester leads to the terminal of the sensor and the other end to
ground. The tester should read ∞.
If the tester does not read ∞, the oil level sensor switch is faulty.
•
Gently lift the PTO side to tilt the engine.