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Checking the gearchange delay

Checking the gearchange delay


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.


1. Put chocks under all 4 wheels.

2. Apply the handbrake fully.

3. 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

less than 0.7 s

Position N to R

less than 1.2 s



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

Fault reason

Delay longer than value specified above when changing from N to D

- Insufficient system pressure

- Faulty SLT

- Fault with C1 (slipping)

- Fault with freewheel F2

- Oil leakage in circuit for D

Delay longer than value specified above when changing from N to R

- 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