TM 5-3895-373-34
2.14
SCREED EXTENSION SYSTEM.
Table 2-9 lists common malfunctions associated with the
screed extension system that may be found during
operation or maintenance of the paving machine.
Perform the tests/ inspections and corrective actions for
a particular malfunction in order given.
This table cannot list all possible malfunctions that may
occur, nor all tests, inspections, or corrective actions. If
a malfunction is not listed, or is not corrected by listed
corrective actions, notify your supervisor.
Table 2-9. Screed Extension System Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
SCREED EXTENSION FAILS TO OPERATE.
WARNING
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.
NOTE
The following tests require 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 being tested.
NOTE
System operating pressure must be at 2475 ±25 psi (17 066 ±172 kPa) before performing
this test. If pressure is not correct, refer to paragraph 2.51 and reset system operating
pressure.
Step 1.
Open right access door per TM 5-3895-373-10. Install hydraulic system tester at outlet (1) for flow
test per TM 9-4940-468-14. Check flow rate at outlet of power-beyond valve outlet (I) with screed
extension in operation.
If flow is present, replace power-beyond valve. Refer to paragraph 2.44.
Step 2.
Check flow rate at stack relief outlet to reservoir (2) with screed extension in operation.
If flow is present, replace stack relief valve. Refer to paragraph 2.44.
If no flow is present, refer to MALFUNCTION 3. AUXILIARY HYDRAULIC SUPPLY TO
VIBRATION AND CYLINDER CIRCUITS FAULTY.
Step 3.
Disconnect hydraulic system tester per TM 9-4940-468-14. Reconnect all hydraulic lines. Close
right access door per TM 5-3895-373-10.
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