TM 5-3895-374-24-1
Excessive Belt Wear
1.
Pulley out of alignment
1.
Realign pulley with flywheel Check alignment
See page 14.
2.
Improper belt tension
2.
Readjust See page 14.
3.
Pulley wobbles
3.
Replace the pulley and check for a damaged
crankshaft or flywheel.
Compressor Won’t
1.
Too much back pressure In
1.
Open petcock when starting motor.
Start in Cold
tank
Temperature
2.
Using wrong grade oil
2.
Use ISO 100 (30W) premium compressor oil
See page 12.
3.
Compressor too cold
3.
Move compressor to a warmer location.
TROUBLESHOOTING THE MAGNETIC STARTER
PROBLEM
POSSIBLE CAUSE
SOLUTION
COMPRESSOR WON’T RUN
1.
Motor hums but
1
Fuse blown in main panel if
1
Check and replace fuse in main panel.
won’t turn
3 phase system
2
Low voltage to compressor
2
Motor wired for wrong voltage See ’footnote
3
Compressor starting under
3
Check head unloader ('bleeder”) valve system.
pressure
2.
Motor doesn't hum
a. Magnetic starter
a1. Power leads to motor
a1. Check wiring and reconnect as needed.
coil clicks
disconnected.
a2. Motor burned out a
a2. Replace motor.
b. Coil chatters
b1. Voltage to coil too low to
b1. See Low Voltage Note.
On & Oft
pull it in
c. Coil Does Not Click c1
c1.Overload tripped out
c1. Press 'RESET button on panel front to reset.
c2. Main power disconnected
c2
Reconnect or replace fuse.
or fuse blown
c3. Pressure switch contacts
c3. Check and free up or replace pressure switch.
stuck open
c4. Low oil level switch open,
c4. Check oil level or replace switch.
c5. Defective starter.
c5. Replace starter assembly.
COMPRESSOR RUNS AND
THEN STOPS
1.Stops shortly after
1
Overload misadjusted
1.
Turn white adjustment screw to a higher
starting or after
number (If applicable).
running awhile
2
Compressor overloading
2 Inspect compressor valves and tank valves
causing motor overload
for carbon build up.
a. Stops shortly after
a1. Low voltage causing
a1. See ' Low Voltage Note.
a2
Low oil level switch open,
a2
Check oil level or replace switch.
if installed.
motor overload.
b. Stops after
b1. Compressor or starter by
b1. Ventilate compressor room area or remove.
running awhile
overheating
starter from compressor and mount on wall.
*NOTE: LOW VOLTAGE - Low voltage can cause a multitude of problems The most common cause of low voltage is
when the wire size supplying power to the compressor is too small The longer the run of wire the larger the diameter must
be to overcome the inherent voltage loss caused by the wire resistance The supply voltage at the main panel could also be
low as supplied by your local power company, or you may have too many other pieces of equipment running off the same
line Your local electrician should be contacted to evaluate and correct the problem according to the National Electrical
Code.
200-2009
(page 3-640)
