HydraMaster RX20 NEXTGEN 120 VAC, Owner'S Manual, Page: 48 / 57

9-1 - RX-20 / CMX-20 Owner’s Manual 9-1 - RX-20 Owner’s Manual
9 - Repair and Replacement
FELT VACUUM SEAL
The felt vacuum seal plays an important part in the optimum performance of your RX20.
If the part is worn or unlubricated, it will not form a proper seal. Lack of a proper seal will
impair the vacuuming capabilities of the unit and therefore leave behind more water in
the carpet than is desirable.
To replace the vacuum seal:
1. First, remove the vacuum head
assembly as previously described.
2. Using a pocket knife or similar tool,
carefully pry the seal up and lift it out. If
the seal appears worn or glazed so that
it will not lubricate well, turn it over (see
Figure 9-1). If that does not work, or if it
is damaged, replace it with a new seal.
3. Chem-Dry recommends changing the felt seal after 10 hours of use. Replace it
with a seal that has been pre-soaked in a quality 30 weight SAE motor oil .
4. Press the seal in place and saturate it with the motor oil. If a flattened seal will be
re-used, place the used seal in an oil bath to rejuvenate it.
For the seal’s oil bath, use a small receptacle the size and
shape of a tuna fish can (see Figure 9-2; a plastic container for
this purpose is included in the Harris Research Service Kit.
Fluffy, Usable Side
Compressed,
Non-usable Side
Figure 9-1. Carefully Pry
Seal Up and Lift Out
Figure 9-2. Use Can to
Hold Oil for Seal