Specifications

Operation
IMPORTANT: Check motor rotation
before operating the compressor.
All lubricated compressor pumps dis-
charge some condensed water and oil
with the compressed air. Install appro-
priate water/oil removal equipment
and controls as necessaryfor the
intended application.
Failure to install
I NOTICE I a_onate
waterloil removal equipment may result
in damage to ma(hinery or workpiece.
GUARDING
The belt guard provided
must be installed before
operating the unit.
All moving parts must be guarded. All
electrical covers must be installed
before turning on the power.
LUBRICATION
THIS UNIT CON-
I_CAUTIONI TAINSNOOI--
Before operating compressor. Fill to the
center of the sight gauge or maximum
mark on dipst_ (see_gure 5).
Some residual oil may still be in the pump
leaving a thin coat on the sight glass,
however; there is not enough oil to oper-
ate the unit. Fill pump with single-viscosi-
ty, ISO100, non-detergent, compressor
oil. Recommended ST126700AVcom-
pressor oil or Mobil 1" 5W30 or 10W30
synthetic oil may also be used.Add oil
only through the oil fill plug. Pouring oil
into any other orifice will causeoil to leak
and spray out during operation. Fill to
the center of the sight gauge or max-
imum mark on dipstick (see Figure
5).
IACAUTiONI Usinganyother
type of oil may
shorten pump life and damage valves.
RECOMMENDED BREAK-IN PERIOD
The compressor should be run continu-
ously for one hour to allow proper
seating of the piston rings.
1. Open drain cock completely and run
the compressor for 60 minutes (See
Figure 6).
Cast Iron Series
Breather Breather
Cap
Oil
Fill
Plug*
SightGauge
OilDrainPlug
* The Oil FillPlug will be inone of the two
locationsshown.
ull
_il
"Fill Plug
Drain
Plug
Dipstick
Breather_
Add Oil Max _ F!II
I Dipstick
and Oil Fill
Figure 5 - Oil Fill Diagrams
2. Turn off the compressor and close
drain cock. The compressor is now
ready for use.
Figure 6 - Opening Drain Cock
If the compressoris run under humid
conditions for short periods of time, the
humidity will condense in the crankcase
and causethe oil to look creamy. Oil
contaminated by condensed water will
not provide adequate lubrication and
must be changed immediately. Using
contaminated oil will damage bearings,
pistons, cylinders and rings and isnot
covered under warranty. To avoid water
condensation in the oil, periodically run
the compressor with tank pressure near
150 psifor two-stage compressorsor 120
psi for singlestage compressorsby open-
ing the drain cockor an air valve con-
netted to the tank or hose. Runthe
pump for an hour at a time at least once
a week or more often if the condensa-
tion reoccurs.
IMPORTANT: Change oil after first50
hoursof operation.
PRESSURESWITCH, START- STOP
NOTE:Thiscompressor hasa maximum
operating pressureof 175 psifortwo-
stage compressorsor 135 psifor single
stagecompressors. Do not alter pressure
settingsoncontrol components above this
limit.
The compressor unit starts and stops
based on preset pressure switch set-
tings. The pressure switch contains an
unloader which isa small valve that
vents air to allow the motor to start
easily (See Figure 7).