TROUBLESHOOTING
CB9A-021 page 23/24
PROBLEM STEP PROBABLE CAUSE WHAT TO CHECK
IF PROBLEM
STILL EXISTS
GO TO STEP ...
Low
Transfer
Rate
1
4-Way Valve Leaking
(when equipped)
Lubricate with a stick lubricant compatible with
material being transferred.
2
2 Worn or Broken Piston Rings
Check condition of rings by restricting discharge
line. If pressure increases slowly, rings are
probably faulty.
3
3 Plugged Strainer Clean screen as necessary. 4
4 Compressor Valve Faulty
Remove and inspect for broken or worn springs,
discs, or bodies.
5
5 Compressor Drive Slipping
Tighten belts, check for sheared keys, loose keys
or loose flywheel.
6
6
Piping Improperly Designed or
Installed
Use proper pipe sizes. 7
Knocks or
Other
Noises
7 Loose Valves Tighten valve hold-down screws. 8
8 Worn Internal Parts
Inspect through inspection plates and repair as
necessary.
4
No Oil
Pressure
9
Oil Pump Relief Valve Not Properly
Set.
Set oil pump relief valve. 10
10 Oil Pump Not Working
Check the Oil Pump drive tab or stop pin for
damage.
11
11 Low Oil Level Check and fill as necessary 12
12 Dirty Oil Inlet Strainer Clean Oil Inlet Strainer
Gas
Leaking
from
Crankcase
Breather
13 Faulty/Worn Packing Replace Packing. 14
14 Piston Rod Scored Replace crosshead assemblies and packing. 15
15 Improper Seal Arrangement See "Seal Arrangements." ---
Relief
Valve
Actuates
16
Valve Closed Downstream of the
Compressor
Open Valve 17
17
Line Blockage Downstream of the
Compressor
Locate Blockage and Correct ---
Shake
or Vibration
18
Loose/Broken Mounting or Anchor
Bolts
See “Mounting the Compressor Unit“ 19
19 Improper Mounting
Ensure base is supported full length. See
"Mounting the Compressor."
20
20 Improperly Aligned V-belt Sheaves See "V-Belt Drives" 21
21 Improperly Installed Flywheel See "Compressor Flywheel" 22
22 Nonfunctioning Valves Replace or repair valves. ---
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