A) Warm up the transmission fluid to operating temperature (50-80°C).
b) Unscrew the service plug of the gearbox housing and connect a pressure gauge in its place.
Attention: the pressure test should always be carried out by two people - one person should observe the wheels, and the second should carry out the check.
A241L, A241E, A245E (until 1994)
A245E (since 1994)
A540N
2. Measure the pressure in the main line.
A) Chock the wheels of the vehicle and apply the parking brake.
b) Start the engine and check the idle speed.
V) Press the brake pedal and move the selector to the position "D". Measure the pressure at idle speed.
G) Press the accelerator pedal all the way. Measure the pressure in the main line when the maximum speed is reached.
Attention: release the accelerator pedal and stop the test if the rear wheels begin to rotate before the speed reaches the maximum value.
d) Repeat the check with the selector position "R".
e) If the pressure is not equal to the specified, then check the adjustment of the automatic transmission control cable and repeat the test.
3. Analysis of test results:
A) If on all ranges the pressure is higher than the specified values, then:
- throttle valve control cable not adjusted,
- throttle valve defective
- pressure regulator defective.
b) If on all ranges the pressure is below the specified values, then:
- throttle valve control cable not adjusted,
- throttle valve defective
- faulty pressure regulator
- faulty gearbox pump,
- defective buck clutch (increasing) planetary row.
V) If the pressure is below the specified values on the range "D", That:
- leakage of working fluid in the control loop on the range "D",
- Faulty forward clutch
- defective buck clutch (increasing) planetary row.
G) If the pressure is below the specified values on the range "R", That:
- oil leakage in the control circuit on the range "R",
- defective reverse clutch
- the brake of the first gear and reverse gear is faulty,
- defective buck clutch (increasing) planetary row.