Manitowoc Published 05-26-17, Control # 238-02 2-29
MLC165-1 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
Changing the Hydraulic Oil
Drain and refill the hydraulic system every 1,000 hours or
semiannually, whichever comes first, unless an alternate
interval has been established through an oil analysis
program.
See Figure 2-27
for the following procedure.
1. Operate the crane until the hydraulic oil is at it’s normal
operating temperature. This will help prevent impurities
from settling in the system.
2. Stop the engine.
3. Remove cover (1) and place it to the side.
4. Open either air vent valve (2) to allow air to enter and
escape from the hydraulic tank when draining and filling.
5. Attach a hose to the drain pipe (8) and insert the free
end of the hose into a suitable container to catch the
hydraulic oil. See the MLC165-1 Lubrication Guide for
the hydraulic system capacity.
6. Verify the hydraulic tank shut-off handle (10) is in the
opened position (10b).
7. Move the drain valve handle (7) to the opened position
(7b) and drain the tank completely.
8. Remove the access cover (12) from the tank. Take care
to prevent dust and wind-blown dirt from entering
tank while the access covers are off.
9. Clean out any sediment inside of the tank.
10. Carefully inspect the suction filter (13) for damaged or
clogged holes and for sludge, gum, or lacquer formation.
If necessary, clean the suction filter:
a. Using a wrench, remove suction filter from inside of
the tank.
b. Soak the suction filter in clean, nonflammable
solvent. Brush off the outer surface of the suction
filter and flush it from the inside out. Discard if
damaged.
c. Securely reinstall the suction filter.
11. Using new seals, securely fasten the access cover to the
tank.
12. Replace the breather (3) desiccant cartridge. See
Replacing Desiccant Breather Cartridge
on page 2-24.
13. Replace the three return filter elements (5). See
Replacing Return Filters
on page 2-25.
14. Replace the pilot manifold filter. See Replacing Pilot
Filter on page 2-26.
15. Replace the swing filter. See Replacing the Swing Filter
on page 2-27.
16. Move the drain valve handle (7) to the closed (7a)
position.
17. Remove the hose from the drain pipe and reinstall the
cab on the pipe.
18. The hydraulic tank can be filled through the power-fill
coupling (6) with an owner supplied pump or through the
manual fill port (4).
19. Fill the tank to the Full Cold Level
symbol next to the oil level gauge
(11).
The hydraulic tank display on the
information screen in the cab should
read 90 to 94%.
Use proper hydraulic oil. See the
Lubrication Guide (Section 9 in this
manual).
Do not fill the tank to 100%. Oil will flow out of the
breather.
20. Close the air vent valves (2).
21. Start the engine and allow the hydraulic system to rise to
normal operating temperature.
22. Check for leaks and correct them as required.
23. Stop the engine.
24. Check the tank level, and fill as required.
NOTE If the hydraulic system was extremely dirty (gum or
lacquer formation on parts indicated by erratic,
jerky, or sluggish operation) repeat this Changing
the Hydraulic Oil procedure after 48 hours of
operation.
25. Reinstall the cover (1).
WARNING
Burn Hazard
Hot oil can escape when removing the breather (3), the
manual fill port plug (4), or the return filter covers (5).
Relieve pressure at either air vent valve (2) in the top of
the tank before servicing the hydraulic tank.
CAUTION
Contamination Hazard
Do not fill hydraulic tank through breather opening or
through top of return filter(s). Harmful contaminants will
enter hydraulic system. Damage to pumps and motors
can occur.
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