TCM FG20N2S - Page 97

(2) Operation of Tilt Lock Valve
The control valve has a tilt lock
valve which prevents vibrations of
the mast due to possible creation of
internal negative pressure in the tilt
also .
incurred from mishandling of the
tilt lever.
When the plunger is drawn out,
the oil flows in the same manner as
in Fig, 11-4.
cylinder and avoids danger
r)
TILT CYLINDER
+ |
J
VA
,I
°7
B
II
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SPRING / /POPPET/ PLUNGER
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l
p
. . . . . .
. . . . .
Fig. 11-5
®
(a) Pushing in of Plunger
The oil from the main pump
flow through the port "B" to the
tilt cylinders. The returning oil
from the cylinders flows through
the oil hole "A" to actuate the
poppet. This allows the oil to pass
through the plunger holes "A" and
"B" to the low-pressure passage and
back to the tank.
PLUNGER
r
I
J
PORT
"A"
* 1
I
PORT uB,1
I
POPPET
Fig. 11-6
(b) Pushing in of Plunger
When the plunger is pushed in
with the engine shut off, the oil
does not flow to the cylinder port
"B" and the pressure at area "P"
does not rise as well because the
main pump is inoperative.
Also, the poppet does not move
so that the oil at the cylinder port
"A" does not return to the tank.
The cylinders thus remains un-
moved.
O
P
f'
PLUNGER
--I
/
l
<3
POPPET
J
PORT
" N
"A"
O
w;
I - ' ° "'\
I
I
I
I
PORT
"B"
I
l
I
r
\
\
Q
(Yo J;
IQ
,I
"f
LL
IV
o,
Fig. 11-7
83