Hilti WFE 450-E, Operating Instructions Manual

Page: 21 / 116

17
9. Troubleshooting
Fault Possible cause Solution
The tool does not start Fault in the electric power supply Plug in another electric tool and check
whether it starts.
Defective supply cord or plug Have it checked by an electrical
specialist and replaced if necessary.
Fault in the electronics module Have it checked by an electrical
(e.g. on / off switch defective) specialist and replaced if necessary.
The tool does not produce full Cross-section of the extension Use an extension cord with adequate
power cord is inadequate cross-section.
Speed pre-selection thumbwheel Adjust speed pre-selection to setting 5
set too low (1 or 2) or 6.
Poor extraction performance Sanding sheet not fitted correctly, Remove the sanding sheet and refit it
extraction holes not in correctly.
alignment
Dust bag is full
Dispose of the old dust bag and fit a
new bag.
Extraction connections blocked Remove the dust box and clean the
extraction channel.
Sanding sheet does not remain Sanding plate is dirty Clean the sanding plate.
attached to the sanding plate Velcro-type attachment surface Replace the sanding plate.
of the sanding plate is worn.
Electrostatic discharge Vacuum cleaner without anti- Use the Hilti WVC 40-M safety
static equipment used vacuum cleaner.
Break in earth / ground conductor Check the earth / ground conductor.
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.
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.
Printed: 07.07.2013 | Doc-Nr: PUB / 5131001 / 000 / 00