Porter-Cable 7800-XE Instruction Manual page 9

FIG. 5
1. turn the vacuum cleaner switch on (I). (Model 7800 only).
WARNING: to reduce the risk of personal injury, AlWAys wear a respirator approved by NIosH for
"Dust and Mist".
2. turn Drywall sander switch on (I).
3. Position the Drywall sander lightly against the work surface. apply just enough pressure to align the
sanding head with the work surface.
4. apply additional pressure to engage the abrasive pad on the work surface. move the sander in an
overlapping pattern to smooth the drywall compound down to a "featheredge".
apply only enough pressure to keep the abrasive pad flat against the work.
Keep the sander in constant motion while the abrasive pad is in contact with the work surface. use a
steady, sweeping motion. Excessive pressure, stopping the sander on the work, or moving the sander
erratically can cause unacceptable swirl marks and unevenness in the work surface.
Note: Do not allow rotating abrasive pad to contact sharp protrusions. contact with protruding objects
(nails, screws, electrical boxes, etc.), can severely damage the abrasive pad.
Abrasive Pad Replacement
WARNING: to reduce the risk of injury, turn unit off and disconnect it from power source before
installing and removing accessories, before adjusting or when making repairs. an accidental start-up
can cause injury.
1. Grasp the abrasive pad and the sander housing to prevent pad rotation.
2. rotate the pad retaining nut (a) Fig. 8 counterclockwise and remove.
3. lift off the large metal washer (B) Fig. 8, and the abrasive pad (c) Fig. 8.
Note: when the abrasive pad (c) Fig. 8 is lifted from the sander, the abrasive back-up disc (a) Fig. 9
is exposed. note that this back-up disc is also covered with an abrasive material, and is used only to
prevent "slippage" between the back-up disc and the foam-backed abrasive pad. It is not suitable for
use as a sanding abrasive. Do Not Use tHe sANDeR WItHoUt A PRoPeR ABRAsIve PAD.
4. Position the new abrasive pad to the back-up disc, and center the hole of the disc on the hub (B)
Fig. 9 of the back-up disc.
5. Position the large metal washer (B) Fig. 8, and the retaining nut (a) Fig. 8, to the sander.
6. rotate the retaining nut clockwise to hand tighten (while holding the abrasive pad as described in
step 1).
FIG. 6
9
FIG. 7