Overdrive Troubleshooting
Overdrive doesn't work? Here's how to start looking for the fault! Is the oil level and type correct? No, change or top up with correct oil. Yes, remove the gearbox cover and loosen the actuating lever (A), start the engine and drive away. At any road speed over 20 mph, in any forward gear, move adjustment setting lever on r/h side of the overdrive, forwards. If the overdrive engages or merely jolts, the "fault" is in the setting or is electrical.
If nothing happens, return to base, jack up the rear wheels and carefully loosen the operating valve plug (B). Start the engine with high idle, engage 2nd gear and oil should bleed past the loosened operating valve plug. Any air should also bleed past, after which the operating valve plug can be retightened. If no oil bleeds out, the pump is inoperative. Usually this is merely stuck and and can be freed by removal of the oil drain plug (catch oil as it drains out). Inspect filter and clean if necessary. Remove pump body plug (C) to reveal the base of the pump. Tap gently with a blunt instrument. Rotate wheels with gearbox in neutral. Pump should move up and down freely. If pump sticks "down" again and the result of the above procedure doesn't help, consult your local overdrive specialist.
Peter Cox, Moss Europe
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