Craftsman 921.16474, 921.16475 Pulley Alignment, Replacing or Cleaning the Check Valve, Risk

PULLEY ALIGNMENT

,_IL_RISKOF INJURY. This unit starts automatically. ALWAYS shut off the compressor, remove the plug from the outlet, and bleed all pressure from the system before servicing the compressor, and when the compressor is not in use. Do not use the unit with the shrouds or belt guard removed. Serious injury could occur from contact with moving parts.

Motor Compressor may yaw from one shown

Motor

bolts

To check pulley alignment, remove the belt guard and place a straightedge (see A) against the pump flywheel (see B) (See Fig. 9). Measure and record the distance from the straightedge to the edge of the drive belt at point C. Then measure the distance from the straightedge to the edge of the drive belt again at points D and E. Both distances should be the same as at point C. If D or E are different from C, there is a misalignment which must be corrected before the compressor is run. To correct a pulley misalignment, use the following procedure.

1.Remove the belt guard.

2.Loosen the motor mounting bolts.

3.Loosen the setscrew on the motor pulley.

4.Align the motor pulley with the pump flywheel (C-D-E must be equal ).

5.Retighten the motor pulley setscrew.

6.Adjust the proper belt tension.

7.Retighten the motor mounting bolts.

8.Reinstall the belt guard. All moving parts must be guarded.

Motor'

C

REPLACING OR CLEANING THE CHECK VALVE

__RISK		OF INJURY. This unit starts
automatically.		ALWAYS shut off the compressor,
remove	the plug from the outlet, and bleed		all
pressure	from	the system before servicing	the

compressor, and when the compressor is not in use. Do not use the unit with the shrouds or belt guard removed. Serious injury could occur from contact with moving parts.

1.Turn air compressor off, remove the power cord from the outlet or lock out the power supply and relieve all the air pressure from the tank. Make sure the compressor has cooled down before servicing.

2.Loosen the compression nut fitting on the check valve and

pump head using an adjustable wrench. Remove the transfer tube.

3.Loosen the compression nut fitting on the side of the check valve and pressure switch using an adjustable wrench. Remove the bleeder tube.

4.Making note of the orientation for reassembly, unscrew the check valve from the tank (counterclockwise) using a 7/8" open end wrench.

5.Using a pencil or screwdriver, carefully push the valve disc up and down. If the valve disc does not move freely up and down, the check valve needs to be cleaned or replaced.

6.Clean the check valve with warm soapy water and make sure to dry thoroughly before reinstalling. If the disc valve still does not move freely up and down, it will need to be replaced.

7.Apply thread sealant to the check valve threads and reinstall into the tank by turning clockwise. Make sure it is the same orientation as when it was removed.

8.Replace the bleeder tube and tighten compression nuts.

9.Replace the transfer tube and tighten compression nuts.

10.Perform the "Break-in of the pump" procedure in the operating instructions to make sure there are no leaks and it'sworking properly.

Open position

Screwdriver

ot

penc_i

C_oselposition

10 200-2792