BLACKMER HD172A, Installation, Operation & Maintenance Instructions Manual

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CB-9A-040 page 22
TROUBLESHOOTING
PROBLEM STEP PROBABLE CAUSE WHAT TO CHECK IF PROBLEM
STILL
EXISTS GO
TO STEP ...
Low Transfer
Rate 1 Worn or Broken Piston Rings Check condition of rings by restricting
discharge line. If pressure increases slowly,
rings are probably faulty. 2
2 Compressor Valve Faulty Remove and inspect for broken or worn
springs, discs, or bodies. 3
3 Compressor Drive Slipping Tighten belts, check for sheared keys, loose
couplings or flywheel. 4
4 Piping Improperly Designed or
Installed Use proper pipe sizes.
Knocks or
Other Noises 5 Loose Valves Tighten valve hold-down screws. 6
6 Worn Internal Parts Inspect through inspection plates and repair as
necessary. 2
No Oil
Pressure 7 Oil Pump Relief Valve Not
Properly Set. Set oil pump relief valve. 8
8 Oil Pump Not Working Check the Oil Pump drive tab or stop pin for
damage. 9
9 Low Oil Level Check and fill as necessary 10
10 Dirty Inlet Strainer Clean Inlet Strainer
Gas Leaking
From
Crankcase
Breather 11 Faulty/Worn Packing Replace Packing. 12
12 Piston Rod Scored Replace crosshead assemblies and packing. 13
13 Improper Seal Arrangement See "Seal Arrangements".
Shake or
Vibration 14 Improper Mounting Ensure base rails are supported full length (see
"Mounting the Compressor Unit"). 15
15 Nonfunctioning Valves Replace or repair valves. 16
16 Unbalanced Load Consult Factory-See Notes Below
ADDITIONAL NOTES FOR INTERSTAGE PRESSURE:
Interstage pressure is an important indicator of the proper operation or condition of a two-stage compressor.
* Low interstage pressure may indicate problems with the first stage valve or piston rings.
* High interstage pressure may indicate problems with the second stage valves or piston rings.
Low compression ratios can cause high interstage pressures. Two-stage compressors are not normally
recommended for operation below 5 compression ratios.
Consult factory for further information
.