Craftsman D21245 Belt Replacement, Belt Guard Removal and Installation, Adjust Belt Tension

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.

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.

13 — ENG D21245