Ingersoll-Rand 2475, 3000, 7100, 2340 Maintenance, Breather/Unloader By-Pass, OIL Consumption Check

8

Position of weight and thrust pin when unit is operating.

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.

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 = Horsepower Hours

Ounces of Oil Used

per Ounce

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.

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	=	50 Horsepower
		Operation		Hours per Ounce

2 Ounces of Oil Used

The compressor in the example passes the oil consumption test.

NOTE	New or rebuilt compressor pumps will discharge
	higher than normal amounts of oil until the piston
	rings are seated (approximately 100 operating
	hours).

MAINTENANCE

•WARNING	Before performing maintenance, release air
	pressure from the system and disconnect, lock and
	tag the main power supply or disconnect the wire
	from the engine spark plug.
NOTE	All compressed air systems contain maintenance
	parts (e.g. lubricating oil, filters, separators) which
	are periodically replaced. These used parts may be,
	or may contain, substances that are regulated and
	must be disposed of in accordance with local, state,
	and federal laws and regulations.
NOTE	Take note of the positions and locations of parts
	during disassembly to make reassembly easier. The
	assembly sequences and parts illustrated may differ
	for your particular unit.
NOTE	Any service operations not explained in this manual
	should be performed by an authorized service
	representative.
NOTE	Reference the engine owner's manual for engine
	care information.
NOTE	The following maintenance schedule has been
	developed for typical applications. Maintenance
	intervals should be shortened in harsher
	environments.

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