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UNDERCARRIAGE MLC650 SERVICE/MAINTENANCE MANUAL

8-14

Published 09-09-16, Control # 229-09

Retract Carbody Jacks Using Setup Remote

See Figure 8-8 and Figure 8-10 for the following.

NOTE: The following describes the operation to retract one

carbody jack cylinder. The operation is the same

for all carbody jack cylinders.

When the crane control system is on, the selector solenoid

valve (1) is energized, allowing hydraulic fluid to flow to the

six-section lower accessory valve assembly (2).

When a jack retract command is initiated on the setup

remote transmitter, the CCMB11 control module or IOSB22

control module (depending on the jack being controlled)

energizes the corresponding jack cylinder retract solenoid in

the six-section lower accessory valve assembly. The retract

solenoid valve routes pilot hydraulic fluid through an internal

shuttle valve, then to the corresponding valve spool. This

causes the valve spool to shift to a position that allows

hydraulic fluid from the accessory pump to flow to the

corresponding jack cylinder counterbalance valve (4), via the

orifice with bypass check valve (3).

NOTE: The orifice decreases the maximum flow during the

retract operation.

Within the counterbalance valves, flow and control is as

follows:

• At the piston side valve, the hydraulic fluid pressure from

the piston side of the cylinder and the accessory pump

pressure opens the counterbalance valve. As the

cylinder retracts, the hydraulic fluid from the piston side

of the cylinder goes through the now open

counterbalance valve, then back to tank.

• At the rod side valve, the hydraulic fluid from the

accessory pump flows through the counterbalance

bypass check valve (3), then into the rod side of the

cylinder.

Manitowoc MLC650 Service Maintenance Manual

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