Table 2-6. Hopper Lift System Troubleshooting - Continued.
TEST OR INSPECTION
HOPPER WING FAILS TO REMAIN IN RAISED POSITION.
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.
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.
With paving machine off per TM 5-3895-373-10, check if pressure leaks by check valve
per TM 9-4940468-14. After securely blocking hopper wing, disconnect hose at hopper
lift cylinder port (3). Connect proof pressure tester to disconnect hose. Pressurize
hose to 2500 psi (17 238 kPa). Pressure should remain at 2500 psi (17 238 kPa) for at
least 5 minutes.
If pressure does not remain at 2500 psi (17 238 kPa) for five minutes, replace or repair check
valve of affected hopper wing per paragraph 2.44.