Manitowoc MLC165-1 Service Maintenance Manual

Reference Only
Manitowoc Published 05-26-17, Control # 238-02 10-5
MLC165-1 SERVICE/MAINTENANCE MANUAL ACCESSORIES
10
Mast
Neutral
Node 1 sends 24Vdc to the mast cylinders extend/retract
switch poles in the cab. Node 5 sends 24Vdc to the mast
cylinder extend/retract switches in the remote set-up
controller. The switches are momentary and normally open,
so the corresponding node reads 0Vdc back when no
switches are being pressed. Node 5 drives no solenoids in
this state, so the valve spool is centered by the return springs
in the neutral position. The center valve position is closed, so
no fluid flows to the cylinder. The holding valves are also in
the closed position, so no fluid can flow from the rod or barrel
end of the cylinder if a load on the cylinder is producing
pressure.
Raise
When either of the mast cylinders extend/retract switches
are toggled to the extend position, the extend contact closes
and sends the 24Vdc supply signal back to the
corresponding node. Node 5 then sends a 24Vdc signal to
the mast raise cylinder extend solenoid, energizing it.
The valve spool moves to the open position. Fluid flows from
the pressure port, through the valve, and on to the holding
valve. At the holding valve, fluid flows through the check
valve at the barrel end of the valve and into the barrel end of
the cylinder. At the same time, fluid opens the valve at the
rod end of the cylinder. As fluid fills the barrel end of the
cylinder, the rod extends and the movement forces fluid out
of the rod end, through the open holding valve, through the
open valve, and back to tank.
Lower
When either of the mast cylinders extend/retract switch is
toggled to the retract position, the retract contact closes and
sends the 24Vdc supply signal back to the corresponding
node. Node 5 then sends a 24Vdc signal to the mast raise
cylinder retract solenoid, energizing it.
The valve spool moves to the reversing position. Fluid flows
from the pressure port, through the valve, and on to the
holding valve. At the holding valve, fluid flows through the
check valve at the rod end of the valve and into the rod end
of the cylinder. At the same time, fluid opens the valve at the
barrel end of the cylinder. As fluid fills the rod end of the
cylinder, the rod retracts and the movement forces fluid out
of the barrel end, through the open holding valve, through
the open valve, and back to tank.
M100845
Figure 10-6. Mast Cylinder Control

Manitowoc MLC165-1 Specifications

General

Brand	Manitowoc
Model	MLC165-1
Category	Construction Equipment
Language	English