Yanmar YM276 Service Manual page 642

270-1138
Hydraulic Lift Operation
POSITION CONTROL OPERATION
(Continued)
A
-
Main S p w l
B
-
U n l o d
Vain
E -Mechanical Chs* valve
TA
-
Return pott
TB - T o rwervoir
TC
-
To raarroir
Tg
-
To rssrrmr
I - P r - m
FraeOil
Em-
Prsnurrzd Oil
T r m d oil
LOWER (OIL FLOW I N CONTROL VALVE)
Shifting the control lever forward pulls the main spool
I A I out of the control valve housing and presses the push
rod against the mechanical check valve
(E).
This position
of the main spool allows
the
pressurized fluid behind the
unload valve (9) t o flow through the return port (TB).
Similar1 y. the pressurized fluid from the pump flows back
into thetransmission case through the return port (TA).
-