Manitowoc MLC150-1, Руководство по техническому обслуживанию

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ACCESSORIES MLC150-1 SERVICE/MAINTENANCE MANUAL
10-2
Published 03-21-2021, Control # 264-01
CAB TILT OPERATION
See Figure 10-1 and Figure 10-2
The system consists of the OLB pump, a 2-position,
proportional solenoid-operated accessory enable control
valve, a 3-position, solenoid-operated control valve, and a
double-acting hydraulic cylinder with holding valve.
Neutral
In neutral there is no signal to the cab tilt control valve, so the
valve is closed and no fluid flows to the cylinder. The holding
valve is also in the closed position to prevent cylinder
movement and lock the cab in the last position it was moved
to.
Raise
When a raise command is sent by the cab tilt switch, the
following occurs:
• The proportional solenoid on the accessory enable valve
is energized by a PWM signal from the control system to
adjust the flow rate of oil to the high pressure accessory
valve bank.
• At the same time, the raise solenoid on the cab tilt
control valve is energized by 24 VDC from the CCS.
• The energized solenoid shifts the valve spool to the
position that routes hydraulic oil to the barrel end of the
cab tilt cylinder.
• The oil flows over the load holding check valve to the
barrel end of the cylinder and the cylinder extends to
raise the cab.
• The hydraulic oil in the rod end of the cylinder flows back
to tank via the high pressure accessory valve.
Lower
When a lower command is sent by the cab tilt switch, the
following occurs:
• The proportional solenoid on the accessory enable valve
is energized by a PWM (pulse width modulation) signal
from the CCS to adjust the flow rate of oil to the high
pressure accessory valve.
• At the same time, the lower solenoid on the cab tilt
control valve is energized by 24 VDC from the CCS.
• The energized solenoid shifts the valve spool to the
position that routes hydraulic oil to the rod end of the cab
tilt cylinder.
• Pressure from the rod end of the cylinder pilots open the
load holding valve allowing the oil from the barrel end of
the cylinder to flow back to tank via the high pressure
accessory valve.
• The cylinder retracts to lower the gantry.
COUNTERWEIGHT PINS
See Figure 10-1 and Figure 10-2
Counterweight Pins Overview
The counterweight pins are controlled by a switch on the
remote control. The system consists of the pilot pump, a 2-
position, solenoid operated control valve, and a double-
acting hydraulic cylinder.
T h e se tu p r em ot e co nt r o l co m m u ni c at es w i th t he
counterweight pins solenoid valve via the CCS.
To activate the setup remote, it must be turned in crane’s
main display. See the Main Display Operation Manual
provided with the crane.
The counterweight pins switch on the remote control is a 2-
position locking switch. The switch must be unlocked and
held in the engage or disengage position.
Engage (extend)
When the counterweight pins switch is unlocked and moved
to the engage position, the following occurs:
• The solenoid on the counterweight pins control valve is
deenergized.
• A spring shifts the control valve to the engage position.
• Hydraulic oil from the pilot pump is routed to the piston
end of the counterweight pin cylinders.
• The counterweight pin cylinder rods extend to engage
the counterweight pins.
• The oil from the rod end of the cylinders flows back to
tank via the low pressure accessory valve.
Disengage (retract)
When the counterweight pins switch is unlocked and moved
the disengage position, the following occurs:
• The solenoid on the counterweight pins control valve is
energized by 24 VDC from the CCS.
• The solenoid shifts the control valve to the disengage
position.
• Hydraulic oil from the pilot pump is routed to the rod end
of the counterweight pin cylinders.
• The counterweight pin cylinder rods retract to disengage
the counterweight pins.
• The oil from the piston end of the cylinders flows back to
tank via the low pressure accessory valve.
REFERENCE
ONLY