TROUBLESHOOTING
588/A page 21/24
PROBLEM STEP PROBABLE CAUSE WHAT TO CHECK
IF PROBLEM
STILL EXISTS
GO TO STEP ...
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
Liquid Relief Valves Need
Adjusting
Adjust per instructions in "Valve Replacement." 6
6 Compressor Drive Slipping
Tighten belts, check for sheared keys, loose keys
or loose flywheel.
7
Low
Transfer
Rate
7
Piping Improperly Designed or
Installed
Use proper pipe sizes. 8
8 Liquid Trap Full
Drain liquid trap through drain valve. Relieve
vacuum through bleeder valve on top of liquid trap.
9
No
Flow
9 Excess Flow Valves Slugged
Stop the compressor to let the excess flow open.
Installation of a valved bypass line between the
suction and discharge lines my be necessary.
6 & 7
10 Loose Valves Tighten valve hold-down screws. 11
Knocks or
Other
Noises
11 Worn Internal Parts
Inspect through inspection plates and repair as
necessary.
4
12
Oil Pump Relief Valve Not Properly
Set.
Set oil pump relief valve. 13
13 Oil Pump Not Working
Check the Oil Pump drive tab or stop pin for
damage.
14
14 Low Oil Level Check and fill as necessary 15
No Oil
Pressure
15 Dirty Inlet Strainer Clean Inlet Strainer
16 Faulty/Worn Packing Replace Packing. 17
17 Piston Rod Scored Replace crosshead assemblies and packing. 18
Gas
Leaking
from
Crankcase
Breather
18 Improper Seal Arrangement See "Seal Arrangements." ---
19
Valve Closed Downstream of the
Compressor
Open Valve 20
Relief
Valve
Actuates
20
Line Blockage Downstream of the
Compressor
Locate Blockage and Correct ---
21
Loose/Broken Mounting or Anchor
Bolts
See “Mounting the Compressor Unit“ 22
22 Improper Mounting
Ensure base is supported full length. See
"Mounting the Compressor."
23
23 Improperly Aligned V-belt Sheaves See "V-Belt Drives" 24
24 Improperly Installed Flywheel See "Compressor Flywheel" 25
Shake
or Vibration
25 Nonfunctioning Valves Replace or repair valves. ---
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