Speedaire 3JR85 Manuel D'utilisation page 9

Speedaire Operating Instructions
Cast Iron Series
Troubleshooting Chart (Continued)
Symptom
Pump overheating causes air
filter to melt
Excessive noise
(knocking)
Large quanity 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. 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
Normal operation. The
amount of water increases
with humid weather
1. Use of extension cord
2. Malfunctioning check
valve or unloader valve
9
Corrective Action
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
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