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bottom of the sander. The softness of these pads helps to blend the
graining. (See the accessories listed in the back of this manual for
catalog numbers of these pads.)
To replace the steel shoe, (1) remove the retaining screws and clamp bar,
and (2) attach the graphite pad.
MAINTENANCE
KEEP TOOL CLEAN
Periodically blow out all air passages with dry compressed air. All plastic
parts should be cleaned with a soft damp cloth. NEVER use solvents to clean
plastic parts. They could possibly dissolve or otherwise damage the material.
CAUTION: Wear safety glasses while using compressed air.
FAILURE TO START
Should your tool fail to start, check to make sure the prongs on the cord plug
are making good contact in the outlet. Also, check for blown fuses or open
circuit breakers in the line.
DRIVE PULLEY
The rubber-covered drive pulley at the rear of the machine is tapered
from the center to either side to make the abrasive belt run in line with
the idler pulley at the front of the machine. After considerable use, the
crown of the pulley will wear away and the belt will begin to run off the
side of the pulley and cut into the guide block or frame. When this
happens, have the drive pulley replaced by your Authorized Porter-Cable
Service Station. Check the crown each time the abrasive belt is replaced
and tracked. After the belt is tracked to the front pulley, watch it for a few
seconds to see that it stays in place on the back pulley. Avoid getting oil
and grease on the rubber cover.
BELT GUIDE
The belt guide, or traction block, is made of hardened steel, and is
located to the left and to the rear of the idler pulley, fastened to the
frame. This block protects the frame of the machine. Always readjust the
belt so it moves evenly across (without rubbing) the guide block. This
block can be turned over for further use when it becomes worn and
uneven. Once both sides are worn and uneven, replace the block. Look
for the correct part, specified in the parts list for your sander.
LUBRICATION
Although all PORTER-CABLE tools have been thoroughly lubricated with
a sufficient amount of high grade lubricant at the time of manufacture,
check the oil level in the gear chamber prior to using your tool and
periodically thereafter as follows:
MODEL 503 – CHECKING THE OIL IN THE GEAR CHAMBER:
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