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6
2. Microfilter: This small polyester felt sock, which fits over the motor bottom will
require periodic inspection. Dust will discolor the microfilter. Change the microfilter
as soon as any discoloration is easily noticeable. Do not shake this microfilter since
this can cause liberation of potentially harmful microscopic dust into the air.
Carefully remove and discard with collected debris in the sealable poly bag. If
equipped with a Gore-Tex microfilter, the same rules for periodic inspection and
disposal apply. The Gore-Tex microfilter, which features a clamp that holds it in
place, must be changed when any abrasions, damage or heavy discoloration is noticed
on the surface of the filter (refer to photo 1).
3. HEPA or ULPA Exhaust Filter: This cartridge is mounted on
the top of the motor, outside the container. If the main filter
and microfilter are properly maintained, the glass fiber
element in the exhaust filter should perform satisfactorily for a
minimum of one year. It cannot be renewed or restored. Exact
life will depend upon frequency of use and amount and type
of material collected. Normally four changes of microfilter
equal one change of HEPA/ULPA filters. Remove the
protective metal casing and replace the pleated glass fiber
cartridge according to the accompanying instructions (photo
8). Cartridges must be replaced more frequently if the vacuum
cleaner has had unusually heavy use, or if the various pre-
filters have been neglected.
CAUTION: Use only genuine Nilfisk replacement filter components. The use of
substitute components could pose a grave risk of personal exposure, and will cause all
equipment warranties to be void.
TROUBLESHOOTING
Loss of Power:
1. Make sure the power cord is properly fastened to the motor head, and it’s properly
plugged into the socket.
2. Be sure the electrical circuit has not blown a fuse.
3. If the circuit is functioning properly, but there is still no power, contact the Nilfisk
Customer Service Department at (800) 645-3475, extension 2.
Loss of Suction:
If the GM 80 loses suction power during operation, there may be several reasons,
the most likely of which is a full container. Suction loss is gradual as the container fills
with debris. Check to see if there is any blockage or restriction in the hose.
1) Check the condition of the main filter and microfilter (refer to photos) and determine
whether there is an excessive loading of debris. If there is overloading in the main
filter, you can shake it out. If the problem exists with the microfilter, including if it is
loaded, it needs to be replaced. Call our Customer Service Department at (800) 645-
3475, extension 2 to order a replacement.
2) If all fails, call our Customer Service Department at (800) 645-3475, extension 2.
Photo 8
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