Checking the gearchange delay
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Checking the gearchange delay
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When the selector lever is moved from N to D or from N to R while the engine in idling, a slight jolt will be felt after a brief delay. The delay test below demonstrates the condition of the hydraulics, clutches and brakes.
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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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Measure the time between the moment of moving the selector lever and the jolt. Use a stopwatch. The delay should be:
Position N to D
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less than 0.7 s
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Position N to R
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less than 1.2 s
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Repeat the procedure 3 times and calculate the mean value. Wait at least 1 minute between measurements to ensure there is no residual pressure.
Results of delay test
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Fault reason
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Delay longer than value specified above when changing from N to D
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- Insufficient system pressure
- Faulty SLT
- Fault with C1 (slipping)
- Fault with freewheel F2
- Oil leakage in circuit for D
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Delay longer than value specified above when changing from N to R
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- Insufficient system pressure
- Faulty SLT
- Fault with C2 (slipping)
- Fault with brake B3 (slipping)
- Oil leakage in circuit for R
- Fault with oil pump
- Blocked oil strainer
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