Manitowoc Published 10-09-2020, Control # 259-06 8-9
MLC80A-1/MLC90A-1/MLC100A-1/MLC100-1 SERVICE/MAINTENANCE MANUAL UNDERCARRIAGE
Assembly
1. Connect the hose from the pump outlet port to the
cylinder inlet (Figure 8-6
).
2. Apply 1-1/2 wraps of a high-grade thread sealant (Teflon
tape) to the fittings.
Maintenance
See Figure 8-6.
1. Keep the unit clean and stored in a safe place where it
cannot be damaged.
2. Assure correct pump oil level. To check the level:
a. Turn the pump valve (5) counter-clockwise, push
the jacking handle (6) all the way down, and fully
retract the jacking cylinder (1) rod to return all oil to
the pump. The cylinder must be fully retracted or
the system will contain too much oil after filling.
b. Place the pump (4) horizontally on a flat surface.
c. Using a screw driver, remove the vent fill cap (3).
d. Add hydraulic oil to the pump until the reservoir is
two-thirds full. Do not overfill.
e. Reinstall the vent fill cap.
f. Test pump operation and remove air from system, if
required. Recheck oil level after removing the air.
Air Removal
See Figure 8-6.
1. Rotate the valve (5) clockwise until finger tight.
2. Position the pump (4) so it is higher than the cylinder (1)
and position the cylinder so the rod is down.
3. Operate the jacking handle (6) up and down to fully
extend the jacking cylinder (1) rod.
4. Rotate the valve (5) counterclockwise, push the jacking
handle (6) all the way down, and fully retract the jacking
cylinder (1) rod to force oil and trapped air back into the
pump.
5. Repeat this procedure until the cylinder operates
smoothly. Erratic operation indicates air in the
system.
Operation
See Figure 8-6.
1. Before using the pump:
• Check that all fittings are tight and leak free.
• Check the oil level.
2. To pressurize the jacking cylinder (1) and extend the
rod, close the valve (5) by turning it clockwise until finger
tight. Pump the jacking handle (6) up and down.
Pressure is maintained until the valve is opened.
To reduce the handle effort at high pressure, use short
strokes, maximum leverage is obtained in last five
degrees of stroke.
3. To de-pressurize the jacking cylinder (1), push the
jacking handle down fully and the open the valve (5) by
turning it counterclockwise.
4. The pump can be operated in any position from
horizontal to vertical as long as the hose end of the
pump is down.
CAUTION
Hand Pump Damage
Do not apply sealant to the first complete thread to ensure
the sealant does not shed into the hydraulic system and
cause malfunctioning or damage.
CAUTION
Leaks and Fitting Damage
Do not over tighten the connections, connections only
need to be snug and leak free. Over tightening can cause
premature thread failure and may cause fittings or
castings to split at lower than their rated pressures.
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