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Vecchio 13-02-2014, 10.53.15
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Esperto Mmt
 
Data registrazione: 30-01-2006
Residenza: Ferrara
Messaggi: 856
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Proportional Reducing Valve Sweep - Test
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.

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.

Place the pump backup switch in the AUT position.

Set the engine speed dial at the 10 position.

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

Place all control levers to the NEUTRAL position.

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.

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

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

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

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).

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).
Note: In order for this function to operate properly, the engine must be running and the engine speed dial should 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 right positions.
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