b. Remove motor cable by turning motor cable wire nuts counter clockwise and untwisting motor leads as shown in
figure 4-3. This step must
by a qualified electrician.
c. Remove motor pulley and motor pulley key from motor shaft by turning motor pulley set screw counter clockwise
d. Remove motor mounting nuts, lockwashers, and bolts as shown in figure 4-4.
f. Replace motor on to air receiver mounting bracket. (Figure 4-4)
g. Replace motor mounting bolts, lockwashers and nuts, figure 4-4, but do not tighten.
h. Replace motor pulley and motor pulley key on to motor shaft (figure 4-4).
j. Replace motor cable by twisting motor leads and motor cable leads together as shown in figure 4-3. This step
must be performed by a qualified electrician.
4-8. PRESSURE SWITCH ADJUSTMENT.
Use extreme caution during the following procedures as pressure switch carries
electrical charge which will cause personal injury.
Use extreme caution during the following procedures, as adjusting of pressure
switch will cause unit to start up to pressurize air receiver.
a. Remove pressure switch cover by turning pressure switch cover nut counter clockwise and lifting cover off.
b. Always adjust the range spring nut (A) first, until the operating point on falling pressure is 175 PSI (1210 KPa).
c. Turning nut (A) clockwise will increase setting. Turning it counter clockwise will decrease setting.
adjustment changes both high and low operating points.
d. To adjust operating point on rising pressure, turn differential spring nut (B) clockwise to increase the pressure
difference between high and low operating points and counter clockwise to decrease pressure difference.
e. Begin adjustments by first turning compressor unit off by pushing STOP button on starter switch.