Troubleshooting Guide - Jet JCP-601 Operating Instructions And Parts Manual

TROUBLESHOOTING GUIDE

SYMPTOM
Low discharge pressure
Pump overheating causes air
filter to melt
Excessive noise (knocking)
Large quantity of oil in the
discharge air
NOTE: In an oil lubricated
compressor there will always be
a small amount of oil in the air
stream.
Water in discharge air/tank
Motor hums and runs slowly or
not at all
POSSIBLE CAUSE(S)
1. Air demand exceeds pump capacity
2. Air leaks
3. Restricted air intake
4. Blown gaskets
5. Leaking or damaged valves
1. Insulating gasket between filter and
head is missing
2. Broken valves/blown gasket
1. Loose motor or compressor pulley
2. Lack of oil in crankcase
3. Worn connecting rod
4. Worn piston pin bores
5. Piston hitting the valve plate
6. Noisy check valve in compressor
system
1. Worn piston rings
2. Compressor air intake restricted
3. Excessive oil in compressor
4. Wrong oil viscosity
1. Normal operation. The amount of water
increases with humid weather
1. Use of extension cord
2. Malfunctioning check valve or unloader
valve
3. Low voltage
4. Malfunctioning pressure switch -
contacts will not close
12
CORRECTIVE ACTION
1. Reduce air demand or use a compressor with more
capacity.
2. Listen for escaping air. Apply soap solution to all
fittings and connections. Bubbles will appear at
points of leakage.Tighten or replace leaking fittings or
connections.
3. Clean the air filter element.
4. Replace any gaskets proven faulty on inspection.
5. Remove head and inspect for valve breakage,
misaligned valves, damaged valve seats, etc. Replace
defective parts and reassemble.
Install a new head gasket
each time the head is removed
1. Install gasket.
2. Replace valves or install new gasket.
1. Loose motor or compressor pulleys are a very common
cause of compressors knocking. Tighten pulley clamp
bolts and set-screws.
2. Check for proper oil level; if low, check for possible
damage to bearings. Dirty oil can cause excessive
wear.
3. Replace connecting rod. Maintain oil level and change
oil more frequently.
4. Remove piston assemblies from the compressor and
inspect for excess wear. Replace excessively worn
piston pin or pistons, as required. Maintain oil level and
change oil more frequently.
5. Remove the compressor head and valve plate and
inspect for carbon deposits or other foreign matter on
top of piston. Replace head and valve plate using new
gasket. See Lubrication section for recommended oil
6. Replace.
Do not disassemble check valve
with air pressure in tank
1. Replace with new rings. Maintain oil level and change
oil more frequently.
2. Clean filter. Check for other restrictions in the intake
system.
3. Drain down to full level.
4. Use Mobil 1 ® 10W-30
1. Drain tank more often. At least daily.
2. Add a filter to reduce the amount of water in the air line.
1. Do not use an extension cord. Use longer air hose with
larger diameter.
2. Replace check valve, unloader valve or pressure
switch.
Do not disassemble check valve
with air pressure in tank
3. Check with volt meter, check reset switch on motor. If
reset switch trips repeatedly, find and correct the cause.
See next item.
4. Repair or replace pressure switch.