22 · Diagnostics

Noise gearbox / in a specific gear

Fault diagnosisNoise gearbox / in a specific gear

NOISE GEARBOX / IN A SPECIFIC GEAR

With the engine running, a noise is heard (whilsting inside the gearbox) when a specific gear is engaged

This noise decreases or disappears on changing gear.

1	CHECK SYNCHRONIZER RINGS	All OK	Problems met	Operation
		Results of the tests
	Service the gearbox ( Op. 2110B20) In particular, check the synchronizer rings for the gear involved: they should not show signs of wear on the inner surfaces	Continue to Step 2	Seals worn	Replace the synchronizers
2	CHECK GEARS	All OK	Problems met	Operation
	Service the gearbox ( Op. 2110B20) In particular, check the teeth of the gear concerned: they should not be worn or show signs of seizing	Continue to Step 3	Gears worn	Replace the gears involved
3	CHECK THE FORKS	All OK	Problems met	Operation
	Service the gearbox ( Op. 2110B20) In particular, check the condition of the fork and the relevant gear sleeve	Continue to Step 4	Fork worn	Change the fork and the relevant sleeve
4	CHECKING THE GEAR SET	All OK	Problems met	Operation
	Check the crown wheel and pinion reduction gear ( Op. 2110D20) In particular it should not be worn or damaged there should not be excessive clearance	Continue to Step 5	Reduction gear damaged	Restore the clearance or, if necessary, replace the reduction gear
5	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'

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