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Functional check of free-wheel lock
Functional check of free-wheel lock
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● A 2nd mechanic is required when checking the free-wheel lock.
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‒ To build up a vacuum for the positioning element start engine and run for approx. 30 seconds.
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‒ Raise vehicle.
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‒ Switch on ignition.
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‒ Engage reverse gear.
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‒ Depress clutch pedal.
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‒ Rotate rear wheels forwards and backwards.
The propshaft must drive the front wheels when rotating in both directions.
Note:
When rotating forwards the free-wheel lock must be heard to engage immediately.
The following may be at fault if the rear wheels rotate forwards without resistance:
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◆ Pneumatic system
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‒ Pipes, hoses and connections
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‒ Non-return valve and vacuum reservoir (located in front left wheel housing)
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‒ Check for leaks using hand pump V.A.G 1390.
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‒ Positioning element diaphragm
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◆ Electrical system
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‒ Check wiring and components for short or open circuit according to current flow diagram.
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‒ Check solenoid in positioning element (must be heard to engage when switching on ignition).
Note:
If the pneumatic and electrical systems are OK then the free-wheel unit or the free wheel unit mechanical lock is defective.To service dismantle rear final drive
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