Porter Cable CFFN251N-P Manuel D'instructions page 17

PROBLEM
Pressure reading on
the regulated pressure
gauge drops when an
accessory is used.
Compressor is not
supplying enough air to
operate accessories.
Regulator knob has
continuous air leak.
Regulator will not
shut off air outlet.
CAUSE
It is normal for "some"
pressure drop to occur.
Prolonged excessive
use of air.
Compressor is not
large enough for
air requirement.
Hole in hose.
Check valve restricted.
Air leaks.
Damaged regulator.
Damaged regulator.
17 - ENG
CORRECTION
If there is an excessive
amount of pressure drop
when the accessory
is used, adjust the
regulator following
the instructions in
the Description of
Operation paragraph in
the Operation Section.
NOTE: Adjust the
regulated pressure
under flow conditions
(while accessory
is being used).
Decrease amount
of air usage.
Check the accessory
air requirement. If
it is higher than the
SCFM or pressure
supplied by your air
compressor, you need
a larger compressor.
Check and replace
if required.
Remove and clean,
or replace.
Tighten fittings.
Replace.
Replace.