3rd clutch

3rd clutch

1. Select ’D4’, release handbrake and allow wheels to rotate freely.
2. Allow engine to idle and using assistance, hold throttle control drum fully closed and observe pressure recorded on gauge: Pressure = 3.4 to 3.9 bar
3. Increase engine speed to 2000 rev/min and using assistance, hold throttle control drum slightly more than 1/8 open.
4. Observe pressure recorded on gauge: Standard = 8.2 to 8.9 bar Service limit = 7.5 bar
5. If either pressure reading is non-existent or low, 3rd clutch is faulty.

4th clutch/servo valve

4th clutch

1. To check 4th clutch pressures, carry out same procedures as those used for checking 3rd clutch.
2. If either pressure reading is non-existent or low, 4th clutch is faulty.

Servo valve

3. Select ’R’, release handbrake and allow wheels to rotate freely.
4. Run engine at 2000 rev/min and observe pressure recorded on gauge: Standard = 8.2 to 8.9 bar Service limit = 7.5 bar
5. If pressure reading is non-existent or low, servo valve is faulty.

Throttle valve A pressure test

1. Run engine until it reaches normal operating temperature.

2. Remove throttle valve A inspection plug, discard sealing washer.
3. Connect gauge (0 to 7 bar) of gauge set 18G 1554 to inspection plug hole.
4. Disconnect cable from throttle control drum.
5. Select ’D3’ or ’D4’, release handbrake and allow wheels to rotate freely.