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. 11-43