Porter-Cable CLFRP350 - Manual (Page 23)

23- ENG A10055
PROBLEM CAUSE CORRECTION
Knocking Noise. Possible defect in safety
valve.
Operate safety valve manually
by pulling on ring. If valve still
leaks, it should be replaced.
Compressor mounting
screws loose. Tighten mounting screws,see
Parts manual for torque
specifications.
Carbon build-up in pump. Have checked by a Trained
Service Technician.
Squealing
sound.
Compressor pump has no
oil. See "Oil-Checking" paragraph
in the "Maintenace" section.
Defective check valve. Remove and clean, or replace.
Refer to the "To Replace or
Clean Check Valve" in the
"Service and Adjustment"
section.
Air vent on
dipstick is
blocked. Air vent clogged with
debris.
Clean air vent or replace
dipstick.