Charge Pump; By-Pass Valve - Kubota GR1600EU Workshop Manual

GR1600EU, WSM

(4) Charge Pump

(5) By-pass Valve

The charge pump revolves in combination with pump
shaft to draw oil from the transaxle case, and feed oil to
the charge circuit.
The charge pump is necessary to make up for
leakage from the pump and motor, preventing system.
Charge relief pressure
Condition
• Engine Speed: Rated speed
• Oil Temperature: 50 °C (122 °F)
(1) Internal Snap Ring
(2) Oil Seal
(3) O-ring
(4) Charge Pump Housing
Normally, when the engine is stopped, the pump
shaft and pump cylinder block engaged with it do not
rotate. Thus, the motor shaft does not rotate.
However, pressing the by-pass valve in the center
section permits moving the machine with human power
while the engine is stopped. The following paragraphs
describe this mechanism:
Pressing the by-pass valve connects the forward and
reverse loops in the center section. This allows oil to flow
between the forward and reverse loops through the
by-pass valve to rotate only the motor cylinder block.
This means that pressing the by-pass valve while the
engine is stopped, that is, while the pump shaft is not
rotating, permits rotating the motor shaft engaged with
the motor cylinder block.
(1) By-pass Spring
(2) By-pass Spool
2-M7
TRANSAXLE
Factory 0.31 to 0.50 MPa
2
specifica- 3.1 to 5.1 kgf/cm
tion 44 to 72 psi
(5) Spring (Charge Relief Valve)
(6) Steel Ball
(Charge Relief valve)
9Y1210595TXM0008US0
(3) By-pass Plug
9Y1210595TXM0009US0
KiSC issued 11, 2013 A