Table 2-9. Screed Extension System Troubleshooting - Continued.
TEST OR INSPECTION
AUXILIARY HYDRAULIC SUPPLY TO VIBRATION AND CYLINDER CIRCUITS FAULTY.
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.
Open front top left access door per TM 5-3895-373-10. Check for fuel supplied from fuel injection
pump at each injector. Loosen (but do not remove) one fuel injector nozzle fitting and crank engine
for five seconds. Tighten fuel injector nozzle fitting. Repeat at each fuel injector.
Replace or repair components (auxiliary hydraulic system suction hoses, lines, and fittings per
paragraph 2.54, hydraulic reservoir components per paragraph 2.53) as necessary.
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 being tested.
Install hydraulic system tester for flow test at port (2) per TM 9-4940-468-14. Check flow at right
hand auxiliary hydraulic pump discharge (2). Measure flow rate at 2475 +25 psi (17 066 +172 kPa)
with engine at 2640 ±40 rpm.
If flow rate is less than 5 gpm (19 l/min) at 2475 ±25 psi (17 066 ±172 kPa), replace/repair right
hand auxiliary hydraulic pump per paragraph 2.42.
If flow rate is at least 5 gpm (19 l/min) at 2475 ±25 psi (17 066 ±172 kPa), replace valve and
cylinder flow divider per paragraph 2.55 and repair per paragraph 2.49.
Disconnect hydraulic system tester per TM 9-4940-468-14. Reconnect all hydraulic lines. Install
right access cover per TM 5-3895-373-10. Close right access door per TM 5-3895-373-10.