Hub
Size
Diameter
in . (cm)
Bolt Torque
Ft-lb (kg-meter)
Set Screw
Torque Ft-lb
(kg-meter)
SF
4.625 (11.7)
12–18 (1.7–2.5)
22 (3.1)
E
6.0 (15.2)
30–36 (4.1–4.9)
22 (3.1)
J
7.25 (18.4)
75–81 (10.3–11.1)
109 (15.1)
Figure 3.2B
Tighten the belts until they are taut, but not extremely
tight. Consult the V-belt supplier for specific tension
recommendations. Belts that are too tight may cause
premature bearing failure. Refer to figure 3.2B.
3 .3 Crankcase Oil Pressure
Adjustment
The compressor is equipped with an automatically
reversible gear type oil pump. It is essential to ensure
the pumping system is primed and the oil pressure is
properly adjusted in order to assure smooth operation.
Before starting the compressor, check and fill the
crankcase with the proper amount of lubricating oil
(see figure 1.6B for details).
When the compressor is first started, observe the
crankcase oil pressure gauge. If the gauge fails to
indicate pressure within 30 seconds, stop the machine
and loosen the oil filter. Restart the compressor and
run until oil comes out and tighten the filter.
The oil pressure should be about 20 psi (1.4 bars)
minimum for normal service. If the discharge pressure
is above 200 psi (13.8 bars) the oil pressure must be
maintained at a minimum of 25 psi (1.7 bars). A spring-
loaded relief valve mounted on the bearing carrier
opposite the flywheel regulates the oil pressure. As
shown in figure 3.3, turn the adjusting screw clockwise
to increase the oil pressure and counterclockwise to
lower it. Be sure to loosen the adjusting screw locknut
before trying to turn the screw and re-tighten it after
making any adjustment.
Oil pressure relief valve
adjustment screw
Locknut
Oil pressure guage
Bearing carrier
Figure 3.3
Figure 3.2C
NOTE:
1) When using
five individual V-belts
(5V or 5VX), 1/4 to 3/8 inches (6.4 to 9.5 mm) of movement is normal.
2) When using
five banded V-belts
, movement will be much less due to the stiffness of the banded V-belt design.
14
