TYM T233 HST - Page 190

2) Lifting position
Fig.9
-
48
9-29
Fig.9
-
48
When the main spool is shifted to the lifting position,Passages to the Tank(T2) are closed with
unloading spring and the Fluid from the pump flows into unloading valve spring.,therefore the
force imposed up the left-hand side of the unloading check valve,Consequently the fluid in the T1
port becomes to close the unloading.
The pump delivery fluid pressure open the the loading check valve,then through C port the pump
pressure flows into hydraulic cylinder to lift up the lift arm.