Nilfisk SC370 43B Wartungshandbuch Seite 56

Service Manual- SC370
Troubleshooting
Trouble
Can't turn on the vacuum
motor
The recovery water
vacuuming is insufficient
or there is no vacuuming
Vacuum Motor Current Draw Test
Warning! This procedure must be performed by qualified personnel only.
1. Apply the amp clamp (A, Figure 7) to one of the vacuum motor wires (B, Figure 7).
2. Press one-button start to turn on the machine.
3. Check if the current draw of vacuum motor is between 12A and 16A at 24V.
4. If the amperage is higher than 16A, perform following procedures to detect and correct the abnormal amperage:
Check and clean the vacuum hose if there is debris or dirt inside.
Remove vacuum motor and check the condition of all its components, repair or replace them if necessary.
If above-mentioned procedures can't lead to correct amperage, the vacuum motor must be replaced.
Possible causes
The fuse (F3) has blown
Vacuum motor damaged
Wiring damaged
Control board (EB2) is faulty
The recovery tank is full
The vacuum hose is disconnected from the
squeegee
The vacuum grid is dirty or the float is blocked
The tank cover is not correctly positioned
The tank cover gasket is not in good condition
The vacuum gaskets are damaged or do not
match perfectly
The vacuum hose is broken
The recovery tank is broken
A
Figure 7
Remedy
Replace
Repair or replace
Repair or replace
Replace
Drain the recovery tank
Connect it
Clean the grid/reactivate the float
Adjust
Clean/replace
Repair/replace
Replace
Repair/replace
B
40 Recovery System 55