2.11 HOPPER LIFT SYSTEM.
Table 2-6 lists common malfunctions associated with the
hopper lift 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 2-6. Hopper Lift System Troubleshooting.
TEST OR INSPECTION
Do not disconnect any hydraulic lines, cylinders, or valves without securely blocking
both hopper wings. The hopper wing may fall if not properly secured in position when
the hydraulic system is opened. Severe personal injury or death may result from a
falling hopper wing.
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
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.