Repair Manual MSG 90.6PG Commercial Vehicles, Omnibuses – November 2017
Material no. 1153450_c
2.4
Fault diagnosis
Page 2 of 16
TABLE OF CONTENTS
Step
no.
Inspect/operate
Result/specified status
Troubleshooting
1.2
Manually press back the valve lever for quick
lowering of the seat at the level control against
the retracting spring.
The seat moves down (mechanical
end stop). Compressed air leaks at
the valve for quick lowering of the
seat (venting).
The seat does not move down.
Proceed with inspection
step no. 1.3.
Replace the level control
(Chapter 3.38).
1.3
Release the valve lever for quick lowering of the
seat.
The seat moves back to its original
position.
The seat remains moved down.
The seat does not move back to its
original position.
Proceed with inspection
step no. 1.4.
Check the level control for
fixed valve tappet of the quick
lowering of the seat.
Check the level control
(see inspection step 2.1).
