Trouble Shooting - Champion A Series Operating And Service Manual

AIR PRESSURE SLOW TO BUILD UP:
1. Air filter clogged.
2. Leaks in air system.
3. Compressor too small
4. Worn suction or discharge valves -- the valve cov-
er feeling the hottest will indicate leaky valve.
Two stage compressor -- check interstage pressure.
High interstage pressure -- check H.P. Valves
Low interstage pressure -- check L.P. valves
5. Broken unloader plunger spring -- retards valve
action.
6. Unloading plunger stuck.
7. Blown valve seat O--rings.
8. Worn piston rings.
9. Suction valve unloader plunger O--ring leaking.
UNIT WON'T UNLOAD:
1. Air to control shut off.
2. Control improperly wired.
3. Filter in control line clogged (where used).
4. Filter in pilot clogged (where used).
5. Unloader line leaking.
6. Control stuck -- check for dirt or varnish.
7. Differential of pilot adjusted to jam valve piston
(where used).
8. Control coil burned out.
9. Control pressure switch diaphragm ruptured.
10. O--ring on suction unloader plunger leaking.
NOISY VALVES:
1. Loose assembly.
2. Unloader spring broken.
3. Broken valve spring(s).
4. Weak valve spring(s).
5. Badly worn parts.

TROUBLE SHOOTING

SHORT VALVE LIFE:
1. Dirt entering unit.
2. Heavy carbon deposits.
3. Corrosive vapors entering unit.
4. Uneven or worn valve seat.
5. Weak or collapsed valve spring(s).
6. Compressor over--speed.
7. Very rapid loading and unloading.
8. Broken unloader plunger spring.
COMMON CAUSES OF CONTROL MALFUNC-
TION:
1. Air line to control too small.
2. Dirt, moisture or varnish deposit.
3. Vibration.
4. Air leaks in control lines.
5. Line filters clogged (where used).
6. Pilot misadjustment (where used).
7. Pilot filter clogged (where used).
8. Seating faces of pilot parts nicked (where used).
9. Control improperly wired.
10. Pressure switch diaphragm ruptured.
11. Coil burned out.
12. Contact points burned.
LOW OIL PRESSURE:
1. Check pressure gauge.
2. Low on oil.
3. Clogged pump suction.
4. Clogged oil filter.
5. Worn inserts.
6. Worn oil pump.
7. Weak oil pump plunger spring.
8. Oil filter seal leaking.
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