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42hW-201601
CHAPTER 6 HYDRAULIC SYSTEM
6
3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
4.10.6 CHARGE RELIEF VALVE
K25W661B
(1) Charge relief valve
A42W614A
HST
Pump
Most of oil is circulated in between the pump and motor in the HST. There is no separate charge pump.
Instead, the gear pump of the vehicle body supplies hydraulic oil through the passage.
Most of oil is circulated through the circuit, but oil leakage occurs in the process. Therefore, this amount of oil
loss should be supplemented in the circuit continuously. For this, the pump for charge continuously supplies
oil to the low-pressure side circuit in which oil is returned from the motor. The setting pressure of the charge
relief valve is 5 ~ 7
kgf/cm
2
. When pressure rises due to surplus oil or load in the high-pressure side, the
charge relief valve opens to send oil to the oil tank.
During forward or reverse driving, high pressure is formed in the compression side of the pump while low
pressure is formed in the suction side, leading to oil loss in the low pressure side. If this leads to pressure
drop, the charge relief valve is closed and oil is supplemented through the check valve.
Check valve
Charge relief valve
HST
Motor
Check
valve
(Forward)
(Reverse)
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