Troubleshooting - Hilti WFE 380 Bedienungsanleitung

Replacing the sanding plate
● Disconnect the supply cord plug from the mains
socket.
● Stand the tool on the grip surfaces so that the grit
side of the sanding sheet is visible.
● Remove the sanding sheet.
● Use a suitable tool to release the fastening screws.
● Remove the old sanding plate.
● Clean and check the sanding plate brake. Replace it
if necessary and then fit the new sanding plate.
● Hold the sanding plate securely and tighten the 3 fas-
tening screws.
● Check that the sanding plate is fitted correctly (not
canted, in contact with the brake ring).
● Use the positioning aid when fitting sanding sheets.
This ensures that the dust extraction holes in the sand-
ing sheet are in alignment with the holes in the sanding
plate.
Sanding plate brake
If the speed of rotation when idling increases steadily
after a period of use, this is an indication that the brake
ring of the sanding plate brake has become worn and
should be replaced.

9. Troubleshooting

Fault
The tool does not start
The tool does not produce full
power
Poor extraction performance
Sanding sheet does not remain
attached to the sanding plate
Electrostatic discharge
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Printed: 07.07.2013 | Doc-Nr: PUB / 5131018 / 000 / 00
Possible cause
Fault in the electric power supply
Defective supply cord or plug
Fault in the electronics module
(e.g. on / off switch defective)
Cross-section of the extension
cord is inadequate
Speed pre-selection thumbwheel
set too low (1 or 2)
Sanding sheet not fitted correctly,
extraction holes not in
alignment
Dust bag is full
Extraction connections blocked
Sanding plate is dirty
Velcro-type attachment surface
of the sanding plate is worn.
Vacuum cleaner without anti-
static equipment used
Break in earth / ground conductor
manuals search engine
Replacing the brake ring
● Disconnect the supply cord plug from the mains
socket.
● Remove the sanding plate as described at "Replac-
ing the sanding plate".
● Pull off the old brake ring from the tool housing.
● Take care to ensure that the asymmetrically posi-
tioned recesses in the brake ring are in alignment with
the four screws in the tool.
● Press the brake ring into the corresponding recess-
es, ensuring that the snap-in lugs engage securely.
● The sealing lip should then lie flat, indicating that
the brake ring has been fitted correctly.
● Fit the sanding plate as described at "Replacing the
sanding plate".
Maintenance
Regularly check all external parts of the tool for dam-
age and ensure that all controls operate faultlessly. Do
not operate the tool if parts are damaged or when the
controls do not function faultlessly. Have the tool repaired
at a Hilti service centre if necessary.
Repairs to the electrical section may be carried out only
by a trained electrical specialist.
Solution
Plug in another electric tool and check
whether it starts.
Have it checked by an electrical
specialist and replaced if necessary.
Have it checked by an electrical
specialist and replaced if necessary.
Use an extension cord with adequate
cross-section.
Adjust speed pre-selection to setting 5
or 6.
Remove the sanding sheet and refit it
correctly.
Dispose of the old dust bag and fit a
new bag.
Remove the dust box and clean the
extraction channel.
Clean the sanding plate.
Replace the sanding plate.
Use the Hilti WVC 40-M safety
vacuum cleaner.
Check the earth / ground conductor.
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