Gardner Denver 40 HP, Operating And Service Manual

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13-8-638 Page 43
SYMPTOM POSSIBLE CAUSE REMEDY
Compressor starts too
slowly 1. Wye Delta switch time set
too long. 1. Contact your Gardner
Denver distributor.
2. Minimum Pressure/Check
Valve is faulty. 2. Repair or replace.
3. Supply voltage is too low. 3. Check the supply voltage.
Compressor is low on
delivery and pressure 1. Restricted air filter. 1. Clean or replace filter.
2. Sticking inlet valve. 2. Inspect and clean inlet
valve.
3. Minimum pressure valve
stuck closed. 3. Replace valve.
4. Oil separator clogged. 4. Replace.
5. Intervals of moisture
separator drainage
incorrectly set. 5. Check the setting in the
Air Pilot controller.
6. Condensate drain
solenoid valve is faulty.
6. Replace.
7. Leaks in the compressed
air system. 7. Check for leaks, fix any
leaks found.
8. V-Belts broken. 8. Replace.
9. V-Belts slipping. 9. Test belt tensioning.
10. Pressure limits incorrectly
set. 10. Check/correct pressure
limits in the Air Pilot
Controller.
11. Aftercooler is frozen 11. Thaw out. This machine
cannot operate in
temperatures below 32
°
F
(0
°
C).
High discharge air
temperature 1. Dirty or clogged cooler
face. 1. Clean cooler.
2. Insufficient cooling air
flow. 2. Provide unrestricted
supply of cooling air.
3. Clogged oil filter or cooler
(interior). 3. Replace filter or clean
cooler.
4. Low compressor oil. 4. Add oil to proper level.
5. Faulty temperature
sensor.
5. Replace sensor.
6. Thermostatic mixing valve
stuck open.
6. Repair or replace valve.
Excessive oil
consumption 1. Oil carryover through
lines.
1. See “Oil Carryover”, in this
section.
2. Oil leaks at all fittings and
gaskets. 2. Tighten or replace fittings
or gaskets.