PS-360C Pneumatic Compactor Machine System Caterpillar

Pressure Switch (Air on the Run System Pressure) - Test and Adjust

Usage:

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Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

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Table 1
Required Tools Digital Pressure Indicator
Tool	Item	Part Number	Description	Qty
A	A1	178-3832	Valve	1
A	A2	198-4238	Reducing Bushing	1
B	-	4C-6500	Tire Pressure Gauge	1

Note: Perform the following steps before conducting this procedure:

Park the machine in a flat, level spot.
Place the propel control lever in NEUTRAL.
Engage the parking brake.
Stop the engine.

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Illustration 1	g01081165
(1) Air tank (2) Drain valve

Open drain valve (2) on the bottom of air tank (1). Release all the air pressure in the tank.
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Illustration 2 g01081171

(3) Test port
Remove the plug from air tank (1). Insert Tool A in port (3). Close drain valve (2).
Start the engine. Operate the engine at 2250 rpm (high idle).
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Illustration 3 g01081181

(4) ON switch for the air compressor
Move switch (4) for the air compressor to ON.
After the air compressor stops, use Tool B to measure the pressure at Tool A. The gauge should register 930 ± 35 kPa (135 ± 5 psi).
Open drain valve (2) on the bottom of air tank (1). Record the air pressure in the tank at the point when the air compressor turns on. The pressure should be 760 ± 35 kPa (110 ± 5 psi).
Close drain valve (2). If the pressure is inside the specified range, stop the engine. Then open drain valve (2) and release the pressure in air tank (1). Remove the tooling. If the pressure is outside the specified range, you will need to adjust the switch for the pressure regulator.
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Illustration 4 g01081193

(5) Switch cover
Remove the compressor cover. Remove cover (5) for the switch to the pressure regulator.
If both the cut-in and cut out pressure are out of tolerance, go to Step 10. If the cut-in pressure is out of tolerance, go to Step 10. If cut out pressure is out of tolerance, go to Step 11.
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Illustration 5 g01081201

(6) Adjustment screw
(7) Adjustment screw
If the cut-in pressure is out of tolerance, use adjustment screw (7) to adjust the cut-in pressure. Recheck the cut-in pressure. Go to Step 11.
Note: Adjustment screw (6) adjusts the cut out pressure. Adjustment screw (7) adjusts the cut-in and cut out pressure together.
Check the cut out pressure, as described above. If the cut out pressure is outside the specified range, use adjustment screw (6) to adjust the pressure.
Recheck the cut-in and cut out pressure. If the pressure is inside the specified range, stop the engine. Then open drain valve (2). Release the pressure in air tank (1), and remove the tooling.