Checking hydraulic pressure
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Checking hydraulic pressure
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The hydraulics are tested by measuring the system pressure in D and R positions at idling and stalling speeds. The test indicates the condition of the transmission.
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1.
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Put chocks under all 4 wheels.
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2.
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Apply the handbrake fully.
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3.
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Remove the test plug (for B5) from the gearcase and connect an oil pressure gauge.
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4.
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Press the brake pedal down hard.
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5.
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Start the engine and check the idling speed (825 rpm).
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6.
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Fully depress the footbrake and select D or R and check the system pressure against the values in the table.
Position
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Idling
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Stalling speed
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D
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3.4 - 3.9 bar
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13.1 - 14.2 bar
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R
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5.1 - 6.2 bar
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17.4 - 20.2 bar
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Important
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Do not run for longer than 5 seconds when testing as the oil temperature can rise above the permitted level. Wait at least 1 minute between tests.
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Check that no leaks arise while the oil pressure gauge is connected.
Results of hydraulic test
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Fault reason
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Pressure greater than value specified above for both D and R
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- Faulty SLT
- Fault with voltage to valves
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Pressure lower than value specified above for both D and R
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- Faulty SLT
- Fault with voltage to valves
- Fault with oil pump
- Fault with brake B5
- oil leakage in hydraulic circuit for D or R
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Pressure lower than value specified above for D
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- Insufficient system pressure
- Fault with C1
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Pressure lower than value specified above for R
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- Fault in hydraulic circuit for R
- Fault with C2
- Fault with brake B3
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