Manitowoc Published 05-26-17, Control # 238-02 10-9
MLC165-1 SERVICE/MAINTENANCE MANUAL ACCESSORIES
Cab Tilt
Neutral
Node 2 sends 24Vdc to the cab tilt up/down switch in the
cab. The switch is momentary and normally open, so node 2
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 the cab tilt up/down switch is toggled to the up
position, the up contact closes and sends the 24Vdc supply
signal back to node 2. Node 5 then sends a 24Vdc signal to
the cab tilt up 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 the cab tilt up/down switch is toggled to the down
position, the down contact closes and sends the 24Vdc
supply signal back to node 2. Node 5 then sends a 24Vdc
signal to the cab tilt down, energizing it.
The valve spool moves to the reverse 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.
M100840
Figure 10-11. Cab Tilt Control
To Next Page
Loading...
Need help?
General
