AP-1055D and BG-2455D Asphalt Pavers Auxiliary System Caterpillar

Pump Control Valve (Auxiliary) - Test and Adjust

Usage:

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Personal injury or death can result from sudden machine movement.
Sudden movement of the machine can cause injury to persons on or near the machine.

To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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Personal injury can result from hydraulic oil pressure and hot oil.
Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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Table 1
Required Tools
Tool	Part Number	Description	Qty
A ⁽¹⁾	198-4234	Pressure Gauge Tool Gp	1
B ⁽¹⁾	198-4236	Adapter Cable As	1
C	198-4238	Pressure Sensor Gp	1
D	4C-6500	Digital Thermometer	1

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The 198-4234 Pressure Gauge Tool Gp and the 198-4236 Adapter Cable As are part of the 198-4240 Digital Pressure Indicator .

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Table 2
Optional Tools ⁽¹⁾
Tool	Part Number	Description	Qty
E	8T-0860	Pressure Gauge 0 to 40000 kPa (0 to 5800 psi)	1
F	6V-3989	Fitting	1
G	6V-4143	Quick Connect Coupler	2
H	177-7860	Hose As	1

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The optional tools can be used in place of the digital pressure measurement tools which are specified in the required tool list.

Drive the machine to a smooth, horizontal surface.

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Illustration 1	g01163003

Move propulsion lever (2) into the NEUTRAL position.

Rotate speed dial (3) to the MINIMUM position.

Move parking brake switch (4) to the ON position.

Move screed lower switch (6) to the DOWN position. Lower the screed to the ground.

Move throttle control switch (5) to the LOW IDLE position. Hold the switch in this position for less than 1 second.

Move engine start switch (1) to the OFF position after the engine reaches low idle.

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Illustration 2	g01163004

Move key switch (7) to the OFF position.

Open the access door to the pump compartment. The access door is on the left side of the machine.

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Illustration 3	g01163005

Install Tool (C) on tap (8) of the left grade and slope control valve.

Move key switch (7) to the ON position. Move engine start switch (1) to the START position. Release the engine start switch after the engine starts.

Move throttle control switch (5) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2310 rpm.

Monitor the hydraulic oil temperature with Tool (D) . Operate the machine until the oil temperature reaches 43 ± 5.6°C (110 ± 10°F).

Read the pressure on Tool (A) . The pressure should be 13780 ± 172 kPa (2000 ± 25 psi).

Stop the engine. If the pressure is within the specified range, go to Step 18. If the pressure is outside the specified range, go to Step 16.

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Illustration 4	g01163006

If the pressure is out of the specified range, use a 4 mm hex wrench in order to loosen the set screw on the bottom of pump control valve (9) . Use a 6 mm hex wrench in order to manipulate the adjustment screw which is located on the left side of the pump control valve. Rotate the adjustment screw clockwise in order to increase the pressure. Rotate the adjustment screw counterclockwise in order to decrease the pressure.