TM 5-3895-373-20
REFERENCE INFORMATION
SCREED VIBRATOR 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.
Refer to paragraph 1.21.5 for a functional description of
the screed vibration circuit.
Vibration speed control valve bleeds hydraulic oil to the
hydraulic reservoir. Opening the valve reduces oil flow to
the vibration motors, resulting in lower vibration speeds.
Closing the valve increases oil flow and vibration speed.
Turn valve clockwise to increase vibration speed.
In automatic operating mode, jumper circuit between
vibrator switch terminals #1 and #3 is closed.
When travel switch is on and control handles are in
forward or reverse, closing jumper circuit provides +12
vdc from CB6 to turn on vibrator valve solenoid coil.
When left or right control handle is in neutral, switching
voltage to relay R2 is turned off. Unless R1 or R2 relay
contactor is shorted, placing either control handle in
neutral will open jumper circuit between terminals #1 and
#3 of vibrator switch.
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