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PM1 :Motor pressure
Pin :Inlet pressure
PM2 :Motor pressure
Am :Motor inlet pressure
Ap : Pilot pressure area
Low speed position
To chamber of
two speed piston
Ps : Pilot pressure
Automatic two speed (Motor pressure is high)
R35Z72TM09
Motor pressure is high
The motor displacement is large (low speed displacement) as shown in the figure.
The two speed spool is on the left position if Pin pressure is high. Then, PM1 and PM2 are shutted
by the spool. If the motor pressure is higher and keep the following condition, the spool stay on the
left position.
Ps
Ý
Dp > Am
Ý
Ý
Pin + Kx
Motor pressure is high : (Ap
Ý
Ps) < (Am
Ý
Pin+Kx)
(
(
2)