Table 2-8. Vibration System Troubleshooting - Continued.
TEST OR INSPECTION
VIBRATORS FAIL TO OPERATE OR OPERATE SLUGGISHLY- Continued.
Hydraulic oil can be moderately flammable and can be an irritant to skin, eyes, and
respiratory system. Avoid prolonged exposure. Eye protection and rubber gloves
must be worn when working with hydraulic oil.
The following test requires use of a hydraulic system tester. Install tester in-line at
flow test point indicated by each individual test per TM 9-4940-468-14. Make sure
ratings of all fittings and hoses used are adequate for maximum pressures and flows
All flow rates specified in the test are at a pressure of 2000 psi (13 790 kPa) unless
With screed vibration control valve fully closed (counterclockwise), check for flow at vibration control
valve outlet (1). No flow rate or pressure should be present.
If flow is present, replace faulty screed vibration control valve per paragraph 2.56.
Check operation of hopper lift cylinders and tow point cylinders.
If hopper lift cylinders and tow point cylinders do not function normally, refer to MALFUNCTION
4. AUXILIARY HYDRAULIC SUPPLY TO VIBRATION AND CYLINDER CIRCUITS FAULTY.
If hopper lift cylinders and tow point cylinders function normally, refer to MALFUNCTION 5.
AUXILIARY VIBRATION PUMP HYDRAULIC SUPPLY FAULTY.
Disconnect hydraulic system tester per TM 9-4940-468-14. Reconnect all hydraulic lines. Close
center top left access door and center top right access door per TM 5-3895-373-10. Close rear top
left access door per TM 5-3895-373-10. Close rear top right access door per TM 5-3895-373-10.
Retract extension screeds per TM 5-3895-373-10.