Hyundai 20G-7, Руководство по обслуживанию

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3-12
Operation
The control valve mainly consists of the main relief valve, inching valve, accumulator valve and
directional valve.
The discharged oil from the gear pump enters main relief valve of the control valve and its
pressure is adjusted 10.8~14.9
kgf/cm 2
(154~212psi).
The oil adjusted pressure by the main relief valve is decided on the direction of forward or reverse
by the solenoid valve.
The decided oil is delivered the power transferred from the torque converter to drive axle through
the oil path between spacer and transmission case, the pipe of transmission outside and reverse
clutch.
The remaining oil appropriating clutch pressure flows into the torque converter through the input
pressure control valve in torque converter of the top of space.
At this time, the oil pressure input to the torque converter is adjusted 4~7
kgf/cm 2
(57~100psi), the oil
pressure output from the torque converter is adjusted below 7
kgf/cm 2
(100psi).
The oil in charge of increasing torque in the torque converter flows from the torque converter,
enters the radiator, after refrigerated, it is in charge of clutch lubrication through the lubrication oil
path of the clutch shaft.
The pressure detecting valve and built in accumulator provide a soft plugging when changing
gears.
The pressure detecting valve allows the accumulator to absorb the small shocks of rapid pressure
build up and quick release during gear changes.
When full pressure builds up, the pressure detecting valve shuts the accumulator off and allows it
to empty, so it is ready to function again during gear change.
The inching valve permits the clutch to partially disengage, so that engine rpm can be increased
for lifting while travel speed remains low.
(2)
Oil pressure circuit diagram
Inching valve
Directional
valve
Control valve
Engine
cc/rev
F
R
Forward clutch Reverse clutch
10.8~14.9 kgf/cm
2
Pedal
Accumulator
1.2
1.6
valve
13.2
P3
P2
P1
To torque converter
Main relief
valve
20D7PT09
(3)