CAUTION: When adjusting the differential screw, do not
NOTE: If the differential is increased only by turning the
turn it farther than it will turn easily.
differential crew clockwise, the CUT-IN pressure
changes only slightly, and the CUT-OUT pressure
rises.
5. To increase the differential and maintain the same
CUT-OUT pressure, turn the differential screw
6. Turn on the outside power source to check the
clockwise and, at the same time, turn the pressure
adjustment. To check the CUT-IN pressure, open
adjusting screw counterclockwise.
the drain cock and allow air pressure to drain below
140 psi. Close the drain cock, and the compressor
should start immediately.
7. Install the cover on the magnetic starter.
SECTION V
OPERATION UNDER UNUSUAL CONDITIONS
A. OPERATION IN EXTREME COLD (Below 0 F.)
tightly closed. Do not lubricate excessively as dirt
1. Locate the air compressor in a shed or building
and sand will adhere to excess lubricant and may
whenever possible. If the unit is operated outdoors,
work into moving parts. Wipe off all lubrication
protect it from prevailing winds and cover it with a
points after lubricating.
tarpaulin when not in use.
2.
Keep the motor, magnetic starter, compressor, and
2. Lubricate the air compressor according to the
air receiver tank free from accumulations of dirt and
lubrication chart.
sand. Use compressed air for cleaning or a stiff
3. Avoid excessive handling, kinking, and sharp
brush where deposits re oily, gummy, or heavy.
bending of the air hose, which will become brittle at
3.
Protect the air compressor from dust with s-rt-4, built
low temperature
from tarpaulins, or other dustproof material Keep the
4. Clean and tighten all wiring connections. Make sure
unit covered when not in use.
there are no short circuits. As wiring insulation tends
4.
Clean the compressor air cleaner more often than
to become brittle at low temperatures, avoid
when operating under normal conditions
excessive handling and sharp bending of wires.
D.
OPERATION IN SALT WATER OR HIGH
Protect the electric motor and magnetic starter from
HUMIDITY AREAS
snow and ice.
1.
Protect the unit with a shelter of some kind. Keep
B. OPERATION IN EXTREME HEAT
the sides open for ventilation.
1. Locate the air compressor an operating are that is
2.
Wipe the unit dry at frequent intervals, with particular
well ventilated or provide intake and exhaust fans to
emphasis on the electric motor and magnetic starter.
ventilate enclosed area.
If the unit becomes encrusted with salt, wash it with
2. Lubricate the compressor in accordance with the
fresh water, taking care not to damage the electrical
lubrication chart.
system with water.
3. Check the drive-belt tension frequently. Improper
3.
Make sure all surfaces requiring lubrication are clean
drive- belt tension often results in overheating.
and dry before applying lubricant. Lubricate the unit
4. Keep the electric motor, compressor, and air
in accordance with the lubrication chart.
receiver tank clean.
4.
Coat exposed polished or machined metal surfaces
C. OPERATION IN DUSTY OR SANDY AREAS
with a suitable rustproof material after first remove
1. Lubricate the air compressor in accordance with the
any accumulations of rust.
lubrication chart, making sure that all lubrication
5.
Open the drain cock frequently to blow condensate
points re free from dirt and sand before applying
from the air receiver tank.
lubricant. Keep all lubricant containers clean and
SECTION VI
LUBRICATION INSTRUCTIONS
A. GENERAL LUBRICATION INFORMATION
all excess lubricant after lubricating.
1. Care of Lubricants.
When handling or storing
3. Points of Lubrication and interval. Refer to figure 10.
lubricants make
certain the containers are clean
Intervals are bed on normal operation Reduce to
and securely covered to prevent dirt, dust and other
compensate for abnormal operation and severe
foreign matter from entering. Be sure lubricant is
conditions. During inactive period intervals may be
clean before using.
extended. Drain crankcase only when hot after
2. Cleaning. Clean all s faces surrounding the point to
operation; replenish and check level when cool.
be lubricated before applying the lubricant. Remove
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