Section E - Hydraulics
Operation Description
Transmission Operation - Series 1 Machines
E-26 E-26
9803-9340-8
Forward
K Fig 21. ( T E-26)
The pump swash plate is tilted by the control pedal linkage
causing flow to pass to the motor feed A and the machine
moves forward.
Pressure is also fed to the motor shuttle valve Ma causing
it to move to connect the back pressure relief valve Mb to
the return side of the loop circuit. This prevents excessive
pressure building up in the return line.
Return oil from the motor flows back into the transmission
pump through port B. Any excess oil from the pump casing
is fed back to tank via cooler C.
Motor feed pressure is controlled by high pressure relief
valve Pb. Non-return valve Pd is closed preventing motor
feed pressure from being fed back into the charge circuit.
Charge pump P2 continues to maintain oil within the
system via non-return valve Pe.
707390-1
Fig 21.
Key
C Cooler
E By-pass (Tow) Valve
P1 Transmission Pump
P2 Charge Pump
Pa Charge Valve
Pb High Pressure Relief Valve
Pc High Pressure Relief Valve
Pd Non-return Valve
Pe Non-return Valve
M Motor
Ma Motor Shuttle Valve
Mb Back Pressure Relief Valve
Þ
ß
Þ
ß
Í
Ì
Ðï
Ðî
п
о
н
м
л
Ý
Ó
Ó¿
Ó¾
Û
To Next Page
Loading...
