TM 5-3895-383-24
Problem
There is periodic loss of vibration in HIGH range or LOW
range.
Probable Cause
There is a loose connection in the electric circuit wiring.
The vibratory on/off control is faulty.
The vibratory amplitude selector is faulty.
Problem
The engagement of vibration system is harsh.
Probable Cause
The diameter of the flow control orifice is too large.
The relief valve for the charge circuit is set too high.
Problem
Slow stopping of the vibratory frequency.
Probable Cause
The swashplate and/or the servo piston is sticking.
The diameter of the flow control orifice is too small.
The main relief valve does not close completely on the
return side circuit.
Problem
The compactor will not reach maximum vibration
frequency.
Probable Cause
The frequency gauge is not correctly adjusted or the
gauge is faulty.
Engine high idle is not correctly adjusted.
The adjustment of the stop in the pump servo is not
correct.
The oil level in the eccentric weight housing is too high.
The high pressure relief valves are set too low.
Low charge pressure.
The shuttle valve in the vibratory motor is sticking.
The O-rings in the servo piston assembly have failed.
Problem
The vibratory mechanism is noisy.
Probable Cause
The lubrication oil in the vibrator housing is low.
Loose retaining bolts for the piston motor.
The vibrator shaft bearings have failed.
Problem
The hydraulic oil in the circuit overheats.
Probable Cause
The hydraulic cooler and/or the radiator is restricted.
Low charge pressure.
The thermal bypass valve is faulty.
The main relief valve is open.
An incorrect type of oil is used in the hydraulic system.
Vibratory Electrical Circuit
The vibratory system is engaged by pressing the ON/OFF
control switch (button) on the propel control lever. The
vibratory system does not operate unless the control switch for
the throttle is in the HIGH position and the speed range switch
is in the LOW position.
Problem
The vibratory system does not engage.
Probable Cause
The vibratory fuse is open.
Vibratory ON/OFF control has failed in the open
position.
The speed range switch has failed.
The switch for the throttle control has failed.
The switch for the vibratory amplitude control has failed.
The vibratory control solenoid has failed.
An open circuit exists in the harness for the vibratory
system.
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