48
Figure 2-52
(3) Motion of tilting self-locked valve
There is tilting self-locked valve in tilting cylinder valve slice to prevent mast fall down
suddenly when cylinder cavity take place negative pressure and danger when mal-operating tilting
valve stick. Because this self-locked valve, if even thrusting joy stick, mast cannot be tilted when
forklift motor stop work. Direction of flow liquid is the same as figure 2-52, here, mast is in tilting
backward. When valve core is pushed in.
(a) When pump is working, push valve core into, liquid from main pump flow into tilting
cylinder through joint B, liquid returned from cylinder play on piston through oil pore A. Liquid
return to tank through pore A or B of valve core. See figure 2-53.
(b) When pump is not working, push valve core into,there is no liquid into joint of cylinder B,
so, pressure of point P cannot be up. So, piston cannot move, liquid of cylinder joint A cannot
return to tank, cylinder cannot move. See figure 2-54.
figure 2-53 figure 2-54
(4) Multiway valve operation figure 2-55
Multiway valve operated by joy stick, all of joy stick installed on a support shaft, shaft fit on
panel by bracket, joy stick steer slide valve by connecter rod.
Connecting port A
Connecting port B
Connecting port A
Connecting port B
Self-locking
valve
○
,
A
○
,
B
Self-locking
valve
○
,
A
○
,
B
○
,
P
