Ingersoll-Rand 2475 Owner's Manual page 12

Position of weight and thrust pin when unit is stopped.
PILOT VALVE ADJUSTMENT
If the pilot valve tube line is excessively hot, it is a good indication that
the pilot valve is leaking and adjustment is required.
To adjust the pilot valve, proceed as follows:
1. Stop the unit and disconnect and tag the electrical supply main
switch to prevent accidental start-up.
2. Remove the pilot valve tube and the tube fittings.
3. Remove the pilot valve body and all existing shims.
4. Screw the pilot valve body back into the frame end cover (without
any shims) until contact with the thrust pin is felt. Advance the
pilot valve body 1/4 to 1/2 turn more.
If contact with the thrust pin cannot be felt, the following steps may
be necessary to locate the contact point:
1. Insert a small instrument (punch, rod, nail, etc.) into the end of the
pilot valve until it contacts the valve stem.
2. While still inserted in the pilot valve, make a mark on the
instrument even with the outside edge of the pilot valve body.
3. Keeping the instrument pressed lightly against the valve stem,
screw the pilot valve body into the frame end cover. When the
mark on the instrument starts moving out away from the edge of
the pilot valve body, contact has been made with the thrust pin.
4. Advance the pilot valve body 1/4 to 1/2 turn more and proceed
with step five.
5. Measure the gap between the pilot valve body and the frame end
cover.
6. Remove the pilot valve body and add enough shims to fill the gap
measured in step five.
7. Screw the pilot valve body back into the frame end cover until the
body is tight on the shims.
8. Reconnect the pilot valve tube and tube fittings.
BREATHER/UNLOADER BY-PASS
The breather/unloader by-pass tube lines eliminates air pressure
build-up in the compressor frame by providing a passage for the air
to escape through the inlet unloader (if opened) or (if closed) through
the check valve, therefore, by-passing the inlet unloader and escaping
to atmosphere through the inlet filter/silencer.
12
OIL CONSUMPTION CHECK
A rule of thumb in determining a "passing grade" for oil consumption
is to consider consumption at or above 50 horsepower-hours per
ounce to be acceptable.
The formula is as follows:
Horsepower X Hours of Operation
Ounces of Oil Used
To apply this formula, consider the size of the machine. In the
following example, a 5 horsepower compressor uses 2 ounces of oil
every 20 hours of operation.
5 Horsepower X 20 Hours of Operation
2 Ounces of Oil Used
The compressor in the example passes the oil consumption test.
New or rebuilt compressor pumps will discharge higher
than normal amounts of oil until the piston rings are seated
(approximately 100 operating hours).
START-UP (GASOLINE ENGINE COMPRESSORS)
Do not operate gasoline engine compressors in an enclosed
area.
1) Release any residual tank pressure by slowly opening the
manual drain valve.
2) Turn on the engine gasoline supply.
3) Put the choke in the "on" position.
4) Close the service valve and put the unloader lever in the
"unload" (A) position.
Unloader
5) Start the engine, release the choke, and allow the engine to warm
up for two to three minutes.
6) Return the unloader lever to the "load" (B) position.
Some gasoline engine driven compressors require 5-8 break-in
hours of operation before reaching full capacity and speed.
Horsepower Hours per
=
Ounce
50 Horsepower
=
Hours per Ounce
NOTICE
WARNING
Unloader
NOTICE
22607402 Rev.D