Craftsman 919.728000 - Manuel (Page 13)

13 — ENG D21245
NOTE
If the overload protector shuts the motor
off frequently, check for a possible voltage
problem. Low voltage can also be sus-
pected when:
1. The motor does not get up to full power or
speed.
2. Fuses blow out when the motor is started.
3. Lights dim when motor is started, and
remain dim while it is running.
Pulley and Flywheel - Alignment
The compressor flywheel and motor pulley grooves
must be in-line within 1/32" to assure belt alignment
within sheave grooves. To check alignment, unplug
compressor and remove the beltguard. Place a straight
edge against the outside of the flywheel and measure
the distance from it to the nearest groove. Alignment is
achieved when the other end of the straight edge is
within 1/32" of the measured dimension at the pulley
grooves.
Servicing Intake and Exhaust Valves
The intake and exhaust valves as well as the valve
plates and cylinder head will, over a period of time,
accumulate a residue of carbon-like material on their
surfaces. The material will decrease the efficiency of
the compressor. These components should be in-
spected whenever a problem is suspected and
cleaned or replaced with new parts. Refer to "Outfit
PartsListing", if required. Use the following procedure
to inspect the parts.
1.
Unplug compressor and relieve all air pressure
from the air tank.
2. Disconnect the pressure release and outlet lines
from the air compressor.
3. Remove the hardware securing the cylinder head
and remove the cylinder head and valve plate.
MANY SOLVENTS ARE HIGHLY FLAMMABLE
AND A HEALTH HAZARD IF INHALED. ALWAYS
OBSERVE THE SOLVENT MANUFACTURER'S
SAFETY INSTRUCTIONS AND WARNINGS.
4. Clean carbon deposits in head cavities and valve
plates with lacquer thinner or other suitable
solvent.
5. Clean the intake and exhaust valves with lacquer
thinner or other suitable solvent. Inspect valves;
replace if necessary.
NOTE
Do not use gasket cement on any gasket
surface as this may clog compressor valve
cavities and air flow areas.
6. Reinstall valve plate and gaskets.
7. Install the cylinder head. Snug mounting screws
and studs tight, then torque to 25 to 30 foot
pounds starting at the center and working toward
the outside.
8. Reconnect the pressure release and outlet lines to
the compressor pump.
Belt - Replacement
SERIOUS INJURY OR DAMAGE MAY OCCUR IF
PARTS OF THE BODY OR LOOSE ITEMS GET
CAUGHT IN MOVING PARTS. NEVER OPERATE
THE OUTFIT WITH THE BELT GUARD RE-
MOVED. THE BELT GUARD SHOULD BE
REMOVED ONLY WHEN THE COMPRESSOR IS
UNPLUGGED.
Belt Guard - Removal and Installation
1. Move the "ON/AUTO-OFF" lever to the "OFF"
position. Unplug the compressor. Release all air
tank pressure.
2. On one-piece belt guards, remove the two
beltguard screws on the bottom front of the outfit.
3. On two-peice belt guards, remove the front of the
belt guard by disengaging the snaps. Insert a flat
bladed screwdriver at each snap location and pry
the beltguard apart.
Replace Belt
1. Unplug compressor.
2. Remove (one-piece) beltguard, or front of (two-
piece) beltguard as described above.
NOTE
Loosen the wing nut at the hold down plate. The
motor can be tilted to allow for easy removal or
installation of the belt.
3. Remove belt and replace.
NOTE
The belt must be centered over the grooves on
the flywheel and motor pulley.
Adjust Belt Tension
Adjust belt tension by tightening the wing nut until it
makes contact with the washer, plus one additional
turn.
Pressure Switch - Replacement
PRESSURE LOADS BEYOND DESIGN LIMITS
MAY CAUSE TANK RUPTURE OR EXPLOSION.
PRESSURE SWITCH OPERATION IS RELATED
TO MOTOR HP, TANK RATING AND SAFETY
VALVE SETTING. DO NOT ATTEMPT TO AD-
JUST, REMOVE OR DEFEAT THE PRESSURE
SWITCH, OR CHANGE AND MODIFY ANY
PRESSURE CONTROL RELATED DEVICE. IF
REPLACEMENT IS NECESSARY, THE SAME
RATED SWITCH MUST BE USED. CONTACT A
SEARS SERVICE CENTER FOR REPLACEMENT.
Motor Overload Protector - Reset
The motor has a manual thermal overload protector. If
the motor overheats for any reason, the overload
protector will shut off the motor. The motor must be
allowed to cool down before restarting. Turn the unit
off. To restart, depress the red reset button located on
the end of the motor and turn ON/AUTO-OFF switch to
the ON position.