198001953 - S067 KNOCK ON FRONT SEAT CUSHION

Noise/knocking

		Test results
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Rock in the seat resting on the backrest; check the correct fastening to the floor (four M10 bolts)	Move on to Step 1	Bolts securing seat to floor slack	Retighten the seat to the floor following the correct tightening cycle
1	CHECK ON GUIDE FASTENINGS TO SEAT	All OK	Problems encountered	Operation
	Check the fastenings of the guides to the seat (5 bolts) if the noise disappears	Move on to Step 2	Noise disappears	Retighten the seat to the floor following the correct tightening cycle
2	SEAT LIFTING HINGES CHECK	All OK	Problems encountered	Operation
	Check for clearance at the seat lifting hinges and for noise at the torsion spring	Move on to Step 3	1. Excessive clearance in the seat lifting hinges2. Noise from torsion spring	1. Replace the seat lifting assembly    Op. 7045A36 DRIVER'S SEAT MANUAL HEIGHT ADJUSTMENT DEVICE - R.R 2. Lubricate the torsion spring and check the condition of the bush
3	CHECK ON CUSHION SPRING FASTENING	All OK	Problems encountered	Operation
	Check that the cushion springs are correctly fastened under the base	Move on to Step 4	Detachment of spring mounting from front/rear crossmember	Reattach cushion springs to front/rear crossmembers
4	CHECK ON CONDITION OF CUSHION SPRING TERMINALS	All OK	Problems encountered	Operation
	Check the condition of the cushion spring terminals and spring joins	End of diagnosis	1. Spring terminals broken or spring joins broken2. The noise persists	1. Replacement of front cushion spring assembly plate2. Lubricate that contact areas of the springs with molybdenum disulphide, if the noise persists move on to Step 5
5	BACKREST FASTENING CHECK	All OK	Problems encountered	Operation
	Check that the backrest is correctly fastened under the base of the cushion (four M8 bolts, two on each side)	End of diagnosis	Fixing bolts loosened	Retighten the backrest to the base under the cushion following the correct tightening cycle