DeVillbiss Air Power Company SP-100-F Troubleshooting Guide download pdf (Page 15)

5. If belt tension is not correct, readjust as in step 2

of this procedure.

6. When proper belt tension is achieved, tighten the

remaining motor mounting bolts.

NOTE

Once the motor pulley has been moved from its

factory set location, the grooves of the flywheel

and pulley must be aligned to within 1/16" to

prevent excessive belt wear. Verify the align-

ment by performing the following Pulley and

Flywheel - Alignment procedure.

Pressure Switch - Replacement

PRESSURE LOADS BEYOND DESIGN LIMITS MAY

CAUSE AIR TANK RUPTURE OR EXPLOSION.

PRESSURE SWITCH OPERATION IS RELATED TO

MOTOR HP, AIR TANK RATING AND SAFETY

VALVE SETTING. DO NOT ATTEMPT TO ADJUST,

REMOVE OR DEFEAT THE PRESSURE SWITCH,

OR CHANGE AND MODIFY ANY PRESSURE CON-

TROL RELATED DEVICE. IF REPLACEMENT OF

PRESSURE SWITCH IS NECESSARY, THE SAME

RATED SWITCH MUST BE USED. DO NOT AT-

TEMPT TO REPLACE THE PRESSURE SWITCH.

CONTACT A DEVILBISS AIR POWER AUTHORIZED

SERVICE CENTER FOR REPLACEMENT OF THIS

SWITCH.

Motor Overload Protector - Reset

The motor has a manual thermal overload protector. If

the motor overheats for any reason, the overload pro-

tector will shut off the motor. The motor must be allowed

to cool down before restarting. First, move the "OFF/

ON-AUTO"lever on the pressure switch to the "OFF"

position. To restart, depress the red "RESET" button

located on the end of the motor, then move the "OFF/

ON-AUTO" switch to the "ON-AUTO" position. If mo-

tor does not start allow more time for the motor to cool

down and try the "RESET" button again.

NOTE

If the overload protector shuts the motor off fre-

quently, check for a possible voltage problem.

Low voltage can be suspected 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.

If voltages are correct and motor will not start, re-

place motor.

Pulley and Flywheel - Alignment

The air compressor flywheel and motor pulley must

be in-line (in the same plane) within 1/16" to assure

belt retention within flywheel belt grooves. To check

alignment, perform the following steps:

1. Unplug air compressor from power source.

2. Remove belt guard

3. Place a straightedge against the outside of the

flywheel and the motor drive pulley. Refer to

Figure 6 as required.

Figure 6 – Pulley and Flywheel Alignment

Servicing Intake and Exhaust Valves

The air compressor's 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 pump. These components should be inspected

whenever a problem is suspected and they should be

cleaned or replaced with new parts. Refer to the Parts

Manual if required. Use the following procedure to

inspect these components.

1. Unplug the compressor from power source and

relieve all air pressure from the air tanks.

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.

4. Measure the distance between the edge of the

belt and the straightedge at points A1 and A2 in

Figure 6. The difference between measurements

should be no more than 1/16".

5. If the difference is greater or less than 1/16"

loosen the set screw holding the motor drive

pulley to the shaft and adjust the pulley’s position

on the shaft until the A1 and A2 measurements

are within 1/16" of each other.

6. Tighten the motor drive pulley setscrew to

70-80 in.-lbs.

7. Visually inspect the motor drive pulley to verify

that it is perpendicular to the drive motor shaft.

Points B1 and B2 of Figure 6 should appear to be

equal. If they are not, loosen the setscrew of the

motor drive pulley and equalize B1 and B2, using

care not to disturb the belt alignment performed in

step 2.

8. Retighten the motor drive pulley setscrew to 70-

80 in.-lbs.

9. Reinstall belt guard.

SERVICE INSTRUCTIONS (cont'd)

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DeVillbiss Air Power Company SP-100-F Troubleshooting Guide Page 15

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