Auxiliary Hydraulic Does Not Function in One Direction
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1 Page 1 of 7 Troubleshooting 247B, 257B, 267B, 277B and 287B Multi Terrain Loaders and 216B, 226B, 232B, 236B, 242B, 246B, 248B, 252B, 262B and 268B Skid Steer Loaders Auxiliary Hydraulic Electronic Control System Auxiliary Hydraulic Does Not Function in One Direction System Operation Description: Press the switch (A1) in order to enable the auxiliary hydraulics (A1). Press the switch (A2) in order to enable the auxiliary hydraulics (A2).
2 Page 2 of 7 Illustration 1 g Schematic of the auxiliary/high flow circuit Note: Check for any related diagnostic codes that are displayed on the Caterpillar ET before performing the following Test Steps. Test Step 1. CHECK FOR PUSH BUTTON SWITCHES Check the work tool joystick control for the type of control. The work tool joystick control should have push button switches for A1 and A2. OK - The work tool joystick control uses push button switches for A1 and A2. Proceed to Test Step 2.
3 Page 3 of 7 NOT OK - The work tool joystick control uses an auxiliary control in order to operate A1 and A2. Proceed to Test Step 10. Test Step 2. CHECK FOR PROPER OPERATION FOR A1 Enable the machine. Press the switch (A1). The auxiliary hydraulics (A1) should be active. OK - The auxiliary hydraulics (A1) are active. Proceed to Test Step 3. NOT OK - The auxiliary hydraulics (A1) are not active. Proceed to Test Step 4. Test Step 3. CHECK FOR PROPER OPERATION FOR A2 Release the A1 switch. The auxiliary hydraulics (A2) should be active. OK - The auxiliary hydraulics (A2) are active. Repair: There is no problem at this time. NOT OK - The auxiliary hydraulics (A2) are not active. Proceed to Test Step 7. Test Step 4. CHECK THE STATUS OF THE SWITCH Press the switch (A1). Release the switch. The switch status should have changed from the "CLOSED" status to the "OPEN" status. OK - The switch status changed from the "CLOSED" status to the "OPEN" status. Proceed to Test Step 5.
4 Page 4 of 7 NOT OK - The switch status did not change from the "CLOSED" status to the "OPEN" status. Proceed to Test Step 6. Test Step 5. CHECK THE OUTPUT OF THE ECM Locate the wires P978-GN and L998-OR coming out of the ECM. Enable the machine. Press the switch (A1). E. Measure the voltage from wire P978-GN to wire L998-OR. Measure the voltage on the back side of a connector or by penetrating the wire insulation. Note: Two people will be needed to perform the measurements. One person will need to occupy the seat in order to keep the machine enabled. The other person will take the measurement. The voltage should be greater than 10 VD OK - The voltage is greater than 10 VD Repair: The problem does not appear to be electrical. NOT OK - The voltage is less than 10 VD Test Step 6. CHECK THE SWITCH CIRCUIT Turn the key start switch to the OFF position. Remove the wire harness from the ECM. Press the switch (A1). Measure the resistance from contact 52 to contact 53 of the wire harnesse. connector. The resistance should be less than 5 Ohms.
5 Page 5 of 7 OK - The resistance was less than 5 Ohms. NOT OK - The resistance was greater than 5 Ohms. Repair: The circuit is open in the wire harness and/or the connector. Repair the wire harness and/or the connector or replace the wire harness and/or the connector. Test Step 7. CHECK THE STATUS OF THE SWITCH Release the switch. The switch status should have changed from the "CLOSED" status to the "OPEN" status. OK - The switch status changed from the "CLOSED" status to the "OPEN" status. Proceed to Test Step 8. NOT OK - The switch status did not change from the "CLOSED" status to the "OPEN" status. Proceed to Test Step 9. Test Step 8. CHECK THE OUTPUT OF THE ECM Locate the wires P979-YL and L998-OR coming out of the ECM. Enable the machine. E. Use a 7X-1710 Multimeter Probe in order to measure the voltage from wire P979-YL to wire L998-OR. Note: Two people will be needed to perform the measurements. One person will need to occupy the seat in order to keep the machine enabled. The other person will take the measurement.
6 Page 6 of 7 The voltage should be greater than 10 VD OK - The voltage is greater than 10 VD Repair: The problem does not appear to be electrical. NOT OK - The voltage is less than 10 VD Test Step 9. CHECK THE SWITCH CIRCUIT Turn the key start switch to the OFF position. Remove the wire harness from the ECM. Measure the resistance from contact 52 to contact 62 of the wire harnesse. connector. The resistance should be less than 5 Ohms. OK - The resistance was less than 5 Ohms. NOT OK - The resistance was greater than 5 Ohms. Repair: The circuit is open in the wire harness and/or the connector. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
7 Page 7 of 7 Test Step 10. CHECK THE STATUS OF THE AUXILIARY CONTROL Actuate the auxiliary control. Observe the status for the auxiliary hydraulics on the Caterpillar ET. The amperes for the auxiliary hydraulic status should be displaying values that are greater than "0.00". OK - The reading is displaying values that are greater than "0.00". Repair: If there are no diagnostic codes that are present, the problem does not appear to be an electrical problem. NOT OK - The reading is displaying "0.00" amperes.
Auxiliary Hydraulic Does Not Function in One Direction System Operation Description:
Auxiliary Hydraulic Does Not Function in One Direction System Operation Description: Press the switch (A1) in order to enable the auxiliary hydraulics (A1). Press the switch (A2) in order to enable the
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