TM 5-3805-292-23
0172
CLEANING AND FLUSHING HYDRAULIC SYSTEM CONTINUED
Cleaning Hydraulic System
000172
1. Prepare portable filter as follows:
a. Remove all hydraulic oil from inlet and outlet hoses of portable filter.
b. Remove filter element from portable filter.
c.
Remove all hydraulic oil from portable filter.
d. Clean inside of filter element housing.
e. Install new filter element in portable filter.
2. Determine whether contamination is microscopic or visible. See Types of Contamination in this work package.
3. If contamination is microscopic:
a. Check maintenance schedule for machine to learn whether or not hydraulic oil must be changed. If
necessary, change hydraulic oil (WP 0009).
b. Perform steps 6 through 36.
4. If contamination is visible:
a. Change hydraulic oil (WP 0009).
b. Perform steps 5 through 36.
5. Check amount of contamination in hydraulic system as follows:
a. Disassemble one lift cylinder (WP 0086) and one tilt cylinder (WP 0087) in each circuit. Check for damage
to seals, scoring of cylinder walls, etc. Repair cylinders as necessary.
b. If damage to cylinders was caused by severe contamination and is not the result of normal wear, remove,
clean, and repair all valves, pumps, lines, cylinders, etc. in hydraulic system. To clean lines, refer to Clean-
ing Hoses, Tubes, and Fittings in this work package.
6. Remove cap from reservoir.
7. Connect vacuum pump to reservoir.
8. Start vacuum pump.
N OT E
Reservoir is on LH side of machine (WP 0002).
9. Loosen and remove drain plug from bottom of reservoir.
10. Find valve in fitting kit. Install valve into drain plug hole. Make sure valve is closed.
11. Stop vacuum pump.
12. Connect inlet hose of portable filter to valve.
13. Disconnect vacuum pump.
14. Put return hose of portable filter into reservoir.
15. Open valve in bottom of reservoir.
16. Move switch for portable filter to ON position.
17. Start and run engine at half throttle.
18. Run portable filter for 10 minutes with engine running at half throttle.
0172-6