199002646 - S067 KNOCK ON FRONT SEAT CUSHION

Noise/knocking
Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
Rock in the seat resting on the backrest; check the correct fastening to the floor (four M10 bolts)Move on to Step 1Bolts securing seat to floor slackRetighten the seat to the floor following the correct tightening cycle
1CHECK ON GUIDE FASTENINGS TO SEATAll OKProblems encounteredOperation
Check the fastenings of the guides to the seat (5 bolts) if the noise disappearsMove on to Step 2Noise disappearsRetighten the seat to the floor following the correct tightening cycle
2SEAT LIFTING HINGES CHECKAll OKProblems encounteredOperation
Check for clearance at the seat lifting hinges and for noise at the torsion springMove on to Step 31. Excessive clearance in the seat lifting hinges2. Noise from torsion spring1. 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
3CHECK ON CUSHION SPRING FASTENINGAll OKProblems encounteredOperation
Check that the cushion springs are correctly fastened under the baseMove on to Step 4Detachment of spring mounting from front/rear crossmemberReattach cushion springs to front/rear crossmembers
4CHECK ON CONDITION OF CUSHION SPRING TERMINALAll OKProblems encounteredOperation
Check the condition of the cushion spring terminals and spring joinsEnd of diagnosis1. Spring terminals broken or spring joins broken2. The noise persists1. 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
5BACKREST FASTENING CHECKAll OKProblems encounteredOperation
Check that the backrest is correctly fastened under the base of the cushion (four M8 bolts, two on each side)End of diagnosisFixing bolts loosenedRetighten the backrest to the base under the cushion following the correct tightening cycle