Manitowoc Published 05-26-17, Control # 238-02 2-25
MLC165-1 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
Replacing Return Filters
See Figure 2-24 for this procedure.
This crane has three return filters (7) that filter all oil returning
to the hydraulic tank (6).
If a return filter is dirty, a fault alarm
comes on and a fault symbol appears
on the active display. The Hydraulic
Filter icon and corresponding filter
number 1 appears on the fault display.
Replace all three return filter elements if the fault appears
and at each oil change interval.
NOTE It is normal for the alert to come on at start-up when
the oil is cold. If the filter is not plugged, alert will
turn off after hydraulic oil warms up.
1. Stop the engine.
2. Remove the cover (1).
3. Vent the pressure from the hydraulic tank (6) using
either air vent valve (5).
4. Clean the outsides of the three filter heads in the areas
around filter caps (7a).
5. Replace each element as follows:
a. Remove the filter cap (7a) using the hexagon stud.
Use care not to damage O-rings.
b. Twist and pull the filter elements (7c) to remove it
from the filter body (7b).
c. Lubricate the O-ring (7d) at both ends of the new
element (7c) with clean hydraulic oil and install the
new element over the stem in the filter body (7b).
d. If necessary, replace any damaged O-rings in the
filter cap (7a).
e. Lubricate the O-ring in the filter cap with clean
hydraulic oil.
f. Install the filter cap (7a) onto the filter housing (7b)
and securely tighten.
6. Start the engine and allow the hydraulic system to reach
it’s normal operating temperature.
7. Check the filter caps and return lines for leaks and
service as required.
8. Stop the engine.
9. Check the hydraulic tank level and fill as required (see
step 19
on page 2-29).
WARNING
Burn Hazard
Oil in hydraulic tank may be under pressure and
extremely hot. Allow the hydraulic oil to cool before
replacing the return filter elements.
Hot oil can escape when removing the filter caps. Relieve
pressure at the air vent valve (4, Figure 2-24
) in the top of
the tank before servicing the return filters.
CAUTION
Avoid Hydraulic System Damage
Original Equipment Manufacturers’ filter elements—
available from Manitowoc—must be used on this crane.
Substituting with any other brand or type filter element is
not allowed.
Filter elements made by other manufacturers may
collapse under pressure. This action will allow unfiltered
oil to be drawn into hydraulic system—pumps, motors,
and valves can be destroyed.
Manitowoc will reject warranty claims for damaged
hydraulic components if proper hydraulic filter elements
are not used.
Do not attempt to clean or reuse elements.
Do not operate crane without filter elements installed.
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