HIGH SPEED SHIFT CIRCUIT
Refer to TM 5-3895-373-10 for engine starting and equipment operating procedures. Refer to paragraph 2.10 for
connecting and disconnecting STE/ICE-R test set to DCA.
The high speed shift valve reverses flow to the
hydraulic propulsion motor control ports. The
flow reversal changes the position of a port plate
in the motor, producing more shaft revolutions
per unit flow.
If paving machine starts, circuit breaker CB1 is
conducting +12 vdc to the neutral start circuit.
Thereby, if high speed shift circuit fails, problem
must be in switch, wiring, solenoid valve, or
hydraulic propulsion motor.
To avoid reversing polarity to the voltmeter,
connect negative test lead to equipment ground
and use positive lead to probe for voltage.
Open center top right and center top left access
doors per TM 5-3895-373-10 to gain access to
high speed shift valve.
Refer to paragraph 7.21 for harness and lead