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SERWCE NsTRUcT ONs i
Air Filter - Inspection
and
Replacement
Check Valve - Inspection and
Replacement
NOTE
Keep the air filter clean at all times. Do not
operate the compressor with the air filter re-
moved.
A dirty air filter will not allow the compressor to operate
at full capacity. Before you use the compressor, check
the air filter to be sure it is clean.
If it is dirty, replace it with a new filter. On some models,
the filter may be removed by using a pair of needle
nosed pliers or a screwdriver.
Pull or pry out the old
filter. Push in the new air filter. Other models require
removal of the belt guard and/or filter retainer.
Remove and inspect the check valve at least once a
year or more often if the compressor
is heavily used.
Moisture and other contaminants
in the hot com-
pressed air will cause an accumulation of a carbon-like
residue on the working parts.
If the valve has heavy
carbon build-up, it should be replaced. Use the follow-
ing procedure to inspect, clean or replace the check
valve.
1. Unplug compressor. Release air pressure from the
air tank.
2. Loosen the top and bottom tube nuts and remove
the outlet tube.
3. Unscrew the check valve (turn counterclockwise)
using socket wrench (7/8").
4. Check that the valve disc moves freely and that the
spring holds the disc in the upper, closed position.
The check valve may be cleaned with a solvent.
5. Apply sealant to the check valve threads. Reinstall
the check valve (turn clockwise).
Do not over-
tighten.
6. Replace the outlet tube and tighten top and bottom
tube nuts.
Oil- Checking and Changing
Safety Valve-
Inspection
and
Replacement
Overfilling
with oil will cause premature
compressor
failure. Do not overfill.
Check oil level in the crankcase daily. Remove the oil
fill plug. The oil level should be even with the top of the
fill hole and must not be allowed to be lower than 3/8"
from the top (6 threads) at any time. It is recommended
that the oil be changed
after every 100 hours of
operation. To drain the oil, removethe oildrain plug and
collect the oil in a suitable container. Be sure to replace
the plug securely before adding new oil. Use a special
compressor oil such as Sears 9-16426 orSAE 20-20W
SF motor oil. [Crankcase oil capacity is 16 fluid ounces
(473.2 ml).] Under winter-type
conditions use SAE
10W.
IF THE SAFETY VALVE DOES NOT WORK
PROPERLY, OVER-PRESSURIZATION
MAY
OCCUR, CAUSING
AIR TANK RUPTURE
OR EXPLOSION.
OCCASIONALLY
PULL
THE RING ON THE SAFETY
VALVE TO
MAKE SURE THAT THE SAFETY VALVE
OPERATES
FREELY.
IF THE VALVE IS
STUCK
OR
DOES
NOT
OPERATE
SMOOTHLY, IT MUST BE REPLACED WITH
A VALVE HAVING THE SAME PRESSURE
RATING.
15
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