6 - 2
99906549 rev 00 (JANUARY-2020)
SECTION 6: TROUBLESHOOTING
IOWA MOLD TOOLING CO., INC.
(641) 923-3711
CAS40PL, CAS40PL-CW, CAS40PLE, CAS40PLE-CW
6.2 TROUBLESHOOTING
GUIDE
MALFUNCTION/FAULT
POSSIBLE CAUSE
CORRECTIVE ACTION
Compressor will not start
PTO/hydraulics not engaged
Ensure hydraulics engaged.
Compressor switch OFF
Turn switch ON.
10A fuse blown
Check and replace fuse if necessary (
Section 5.5
).
Compressor pressure switch stuck
Replace; consult Service Department for reset instructions.
Diverter valve not operating
Check power and ground/replace valve.
Hydraulic motor stalled
Switch OFF and attempt to turn the motor by hand to
restart—replace if this fails.
No hydraulic GPM or pressure
Check hydraulic circuit.
Hydraulic relief valve set too low
Check with pressure gauge and reset.
Power unit speed is too low
Check and correct.
Hydraulic line obstructed
Check hoses for kinks, crimping, or damage.
Low hydraulic oil level
Check and re
fi
ll.
Faulty relay
I
Check for presence of power - if present, replace relay.
Compressor runs slow
Hose/connection leaks
Check for leaks or damage/repair (
Sections 7.13
through
7.16
, and the electrical and wiring diagrams,
Section 7.18
and
7.19
).
Low hydraulic
fl
ow/pressure
Check and reset. Refer to
Sections 7.11
and
7.12
for
fl
ow
regulator location and replacement info.
Hydraulic motor or pump worn
Replace.
Low hydraulic oil level
Check and re
fi
ll.
Hydraulic relief valve set too low
Check and reset.
Hydraulic oil line restriction
Check for blockages, kinks, or other obstructions.
Compressor runs hot
Cooling fan not operating
Check/power ground to fan motor wiring diagrams,
Sec-
tion 7.18
and
7.19
).
Insuf
fi
cient ventilation
Relocate unit for better ventilation/circulation.
Low compressor oil level
Re
fi
ll to correct level (
Section 5.4.3
).
Soiled compressor cylinder cooling
fi
ns
Clean.
Soiled air intake
fi
lters
Replace air
fi
lter element (
Section 5.4.4
).
Faulty compressor valves
Inspect and replace.
Low output air
Air
fi
lters soiled or plugged
Replace air
fi
lter element (
Section 5.4.4
).
Air line leak
Inspect and replace hose or tighten connections.
Discharge valve stuck
Remove and clean, or replace.
Faulty compressor valves
Inspect and replace.
Compressor RPM too slow
Check hydraulic circuit.
Safety/relief valve leak
Replace valve.
I
Compressor will not turn on if fan relay is not functioning/tripped. A restart should reset, but if not, the component (fuse or relay) that may need to be
replaced. Refer to
Sections 7.7
and
7.8
for relay location and part con
fi
rmations,
Continued on next page
Summary of Contents for CAS40PL
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