Milton Roy Haskel 8AGD-1, Operating And Maintenance Instructions Manual

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Air Driven Gas Booster Compressor, 8” Drive AG Series • OM-12J
13
7. Troubleshooting Guide
7.1 Symptom 7.2 Possible Cause 7.3 Remedy
Drive will not start nor
cycle with at least 25
psi drive pressure. Air supply blocked or inadequate. Check air supply and regulator.
Cycling valve spool binding. Clean spool by following cycling
valve disassembly instructions.
(Ref. paragraph 5.2)
Either pilot valve stem too short. Replace defective pilot valve.
Exhaust or vent “iced up”.
Too much moisture in drive air.
Install better moisture reduction
system.
Mufflers plugged. Remove, disassemble and clean
mufflers.
Drive will not cycle
under load and pilot
vent leaks air
continuously. Broken pilot charge valve spring (cycling
valve end) causing it to stick open. Then
the pilot vent valve cannot “dump” enough
pilot pressure so it remains held open by
the drive piston. Replace spring.
Defective o-ring on pilot charge valve
(cycling valve end) causing high leakage
into the pilot system. Replace o-ring.
Drive will not cycle.
Mufflers leak drive air
with very audible
“hiss”. Insufficient drive air volume causing
cycling spool to hang up in midstroke or
drive-piston o-ring to bypass air. Increase drive air line size.
Shrinkage or damage to spool seals
and/or large drive piston seal. Inspect spool seals first.
(paragraph 5.2 ) If damaged,
replace and retest. If not
damaged, disassemble drive
and check large o-ring size per
Figure 9 and paragraph 5.5.5.
Drive cycles but gas
section(s) does not
pump. (End cap does
not heat up) Check valve(s) not seating, and/or
leakage of plunger or piston seal
(paragraphs 5.6, 5.7). See compression check
procedure and analysis
(paragraph 6).