Table 2-5. Screed Lift System Troubleshooting - Continued.
TEST OR INSPECTION
SCREED FAILS TO LIFT - 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
Install hydraulic system tester for flow test at outlet (I) per TM 9-4940-468-14. Check flow at stack
valve outlet (1) to return manifold with screed lift switch in lift position.
If flow is present, replace or repair valve controlled by electrical coil S13 per paragraph 2.44 or
replace stack valve per paragraph 2.55.
If no flow is detected, replace or repair valve controlled by electrical coil S12 per paragraph 2.44
or replace stack valve per paragraph 2.55.
The following test requires use of a hydraulic system tester. Install tester in-line at pressure test point
indicated by each individual test per TM 9-4940-468-14. Make sure all ratings of fittings and hoses
used are adequate for maximum pressures and flows being tested.
Install hydraulic system tester for pressure test at port (2) per TM 9-4940-468-14. Check pressure
at power-beyond outlet to track tension system at port (2) with screed lift switch in lift position.
If pressure is 2500 psi (17 238 kPa) with screed lift switch in lift position, replace power beyond
valve per paragraph 2.44 or replace stack valve per paragraph 2.55.
Disconnect hydraulic system tester per TM 9-4940-468-14. Reconnect all hydraulic lines. Close
right access door per TM 5-3895-373-10.