CAT Excavator 312B Proportional Reducing Valve Sweept- Test

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1 de 2 16/04/2010 06:39 p.m.

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Producto: EXCAVATORModelo: 312B L EXCAVATOR 2KWConfiguracin: 312B & 312B L Excavators 2KW00001-UP(MACHINE) POWERED BY 3054 Engine

Pruebas y Ajustes 308B, 311B, 312B, 315B, 317B, 318B, 320B, 322B, 325B, 330B, M325B and W330B Excavators Engine and Pump ControlNmero de medio -RENR1998-06 Fecha de publicacin -01/10/2004 Fecha de actualizacin -06/10/2004

i01256515

Proportional Reducing Valve Sweep - Test

SMCS - 5473-081-QY

This function is used to check that the proportional reducing valve is activating with a current signal from the controller.

Procedure

Table 1

Tools Needed

9u-7401 Multitach

9u-7506 Magnetic Adapter Cable

6v-7070 Digital Multimeter (Heavy Duty) 132-7842 Adapter Cable (Breakout) 4c-4892 ORFS Fittings Group

Stop the engine. Disconnect the proportional reducing valve solenoid from the machine harness. Connect one connector of the test harness to the machine harness at connection point of the proportional reducing valve. Connect the other connector of the test harness to the connector of the proportional reducing valve solenoid.

1.

Install a 4900 kPa (710 psi) pressure gauge at the power shift test port of the main pump. In order to find the location of the pressure tap, see the Testing And Adjusting section in the module for the Hydraulic System of the machine.

2.

Place the pump backup switch in the AUT position. 3.

Set the engine speed dial at the 10 position.4.

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The hydraulic oil should be warmed to a temperature of approximately 50 C (122 F).5.

Place all control levers to the NEUTRAL position. 6.

Activate the service mode and select the sweep test signal for the power shift pressure.

Enter service code 60. The character display shows "oF". This display indicates that the sweep test signal for the power shift pressure is not valid.

a.

The fine control mode switch (25) is pressed in order to shift the blinking positions to the righttwo character.

b.

Press the travel alarm cancel switch (22). "on" should be displayed in the two right characterpositions. This display indicates that sweep test signal of power shift pressure is valid.

c.

Press the travel alarm cancel switch (22) again. "oF"should be displayed. This display indicatesthat the sweep test signal of power shift pressure has stopped.

d.

7.

Perform the following measurement at the test harness. During the sweep test, the reading of the multimeter should be within a range from 0.2 to 0.75A in approximately 20 seconds. The simultaneous reading of the pressure gauge should be from 490 kPa (71 psi) to 3450 kPa (500 psi).

8.

Make sure that the multimeter and the readings of the pressure gauge cycle at a uniform rate of increase or decrease (no spike or quick changes).

9.

Note: In order for this function to operate properly, the engine must be running and the engine speed dialshould be in the position of 10. The temperature of the hydraulic oil must be approximately 50 C (122 F).

Perform the following instruction in order to enter the service code "60". The user mode switch is pressed in order to move the flashing character to the left position. The boom priority mode switch is pressed in order to change the first number to a flashing "6". The second number will be a "0". The two characters on the right side will show "oF". This display indicates that the sweep test signal for the power shift pressure is not activated. The fine control mode switch is pressed in order to move the flashing character to the right side of the display. The alarm cancel switch should be pushed and the display will show "on" in the two rightpositions.

Copyright 1993 - 2010 Caterpillar Inc.Todos los derechos reservados.Red privada para licenciados del SIS.

Fri Apr 16 2010 18:39:31 GMT-0300

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1 de 3 16/04/2010 06:41 p.m.

Cerrar SIS

Pantalla anterior

Producto: EXCAVATORModelo: 312B L EXCAVATOR 2KWConfiguracin: 312B & 312B L Excavators 2KW00001-UP(MACHINE) POWERED BY 3054 Engine

Pruebas y Ajustes 308B, 311B, 312B, 315B, 317B, 318B, 320B, 322B, 325B, 330B, M325B and W330B Excavators Engine and Pump ControlNmero de medio -RENR1998-06 Fecha de publicacin -01/10/2004 Fecha de actualizacin -06/10/2004

i01261370

Proportional Reducing Valve - Calibrate

SMCS - 5473-524-QY


2 de 3 16/04/2010 06:41 p.m.

Illustration 1 g00667434

This function is used to calibrate the proportional reducing valve. This calibration must be performed when the proportional reducing valve or the controller is replaced.

Note: For proper operation of this function, the engine must be running with the engine speed dial switch in position 10 and the hydraulic oil must be at approximately 50 C (122 F).

Attach a 4900 kPa (711 psi) pressure gauge to the power shift pressure port of the main pump.1.

Place the backup switch in the AUT position.2.

Activate the service mode in order to calibrate the proportional reducing valve.3.

Enter service code 71.

First, display (1) indicates the calibration point. "H" is displayed for the high pressure point and "L" isdisplayed for the low pressure point. The value of the correction is the last digit that is displayed.

4.


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The calibration is performed at the following two points:

High pressure point 2500 kPa (363 psi)

Low pressure point 500 kPa (73 psi)

Perform the following operations in order to calibrate the low pressure point and the high pressure point.

Depress fine control mode switch (4) in order to shift the blinking character. Position the blinkingcharacter to the third position from the right.

a.

Depress boom priority mode switch (2) in order to shift the calibration point. Shift to the highpressure point. "71H0".

b.

Depress swing priority mode switch (3) in order to shift the calibration point. Shift to the highpressure point. "71L0".

c.

Depress fine control mode switch (4) in order to shift the position of the character that is blinking.Shift the position of the character that is blinking to the position to the right.

d.

Depress boom priority mode switch (2) or swing priority mode switch (3) in order to locate thepoint that provides the most adequate pressure gauge reading.

e.

When boom priority mode switch (2) is depressed, the power shift pressure will INCREASE by 1step.

f.

When swing priority mode switch (3) is depressed, the power shift pressure will DECREASE by1 step.

Note: The power shift pressure changes approximately 9 kPa (1.3 psi) per step.

g.

5.

Set the increments of the step for the power shift pressure.

Depress travel alarm cancel switch (6) in order to set the new values.

When the new value is set, the position of the blinking character does not change. The third position from the right flashes "H" to "L".

a.

6.

Copyright 1993 - 2010 Caterpillar Inc.Todos los derechos reservados.Red privada para licenciados del SIS.

Fri Apr 16 2010 18:41:36 GMT-0300

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CAT Excavator 312B Proportional Reducing Valve Sweept- Test