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Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4378
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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I Have a cat d4g Dozer 2003 and when u put it in forward or

Customer Question

I Have a cat d4g Dozer 2003 and when u put it in forward or reverse at half throttle it bearly moves. It only goes when u rev the throttle all the way up I think it's a bad solenoid valve but which one is the question
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Dan replied 1 year ago.
Hi my name is***** will be glad to try to help. Are you getting and warning or fault indicators? Here is the procedure to access your fault codes and some troubleshooting information.
Using the Diagnostic Indicator to Determine Diagnostic Codes
Use the following tools in order to determine the diagnostic codes: Diagnostic Indicator and the ET. Determine the diagnostic codes. Perform the procedure that corresponds to the diagnostic code.
Table 1
The Quick Reference Table for the Operation of the Diagnostic Indicator
Operation Contact 1 (1) Contact 3 (1) Contact 5 (1)
The code is placed on hold. Open Open Open
Scroll through the active diagnostic codes. Ground (2) Open Open
Clear (3) the diagnostic codes Open Ground Open
( 1 ) The contact is located in the connector for the harness code. Remove the harness code plug.
( 2 ) Remove the ground in order to stop scrolling. The diagnostic code will be placed on hold.
( 3 ) An active diagnostic code can not be cleared. The diagnostic code must be on hold in order to clear the diagnostic code.
Use the following procedure when a problem is detected:
When a diagnostic code is detected, the diagnostic indicator is illuminated. Determine the diagnostic code. Use table 2 in order to find the correct component failure. The code is flashed on the diagnostic indicator.
Troubleshoot the diagnostic codes with the following procedures:
To enter service mode, disconnect the machine identification plug from the harness code connector. When the control module is in the service mode the control module's diagnostics are available in order to assist with troubleshooting.
A single diagnostic code is shown. The diagnostic code is on hold. Information is shown on the diagnostic indicator by flashing the indicator ON and OFF. The flashes represent a three digit number. A series of flashes represent the first digit. A one second pause follows the first digit. Another series of flashes represents the second digit. A one second pause follows the second digit. Another series of flashes represents the third digit. Count the number of flashes. The number of flashes determine each digit. A three second pause separates each three digit number. Use table 2 in order to find the correct CID.
When you scroll through the diagnostic codes, the codes for all of the active diagnostic codes are shown one at a time. Ground connector contact 1 in order to scroll through the active diagnostic codes. Remove the ground from connector contact 1 in order to stop scrolling. The diagnostic code that is shown is now on hold. A code of 222 indicates that diagnostic codes are NOT active or logged.
Perform the procedure that corresponds to the diagnostic codes.
Clearing a diagnostic code removes the diagnostic code from the control module's memory. When a problem is corrected, it is necessary to remove the diagnostic code from the memory of the control module. The diagnostic code must be on hold in order to clear an inactive diagnostic code. The control module does not allow active diagnostic codes to be cleared.
Place the diagnostic code on hold.
The diagnostic code is on hold. Ground connector contact 3 in order to remove the logged diagnostic code from the control module's memory. The diagnostic indicator is extinguished after the inactive diagnostic code has been cleared. The diagnostic indicator is extinguished until you scroll through the diagnostic codes. The control module does not allow active diagnostic codes to be cleared.
Repeat the procedure for any remaining diagnostic codes. Return to normal mode when you are finished by replacing the machine identification plug. A diagnostic code of 222 indicates that diagnostic codes are NOT active or logged.
Table 2
Conversion Table for the Diagnostic Codes
Codes Component Identifier Description
166 CID 0017 Fuel Shutoff Valve
124 CID 0041 Sensor Power Supply (8 DCV)
168 CID 0110 Engine Coolant Temp Sensor
222 None Not Active or Logged Diagnostic Codes
244 CID 0070 Rocker Switch (Parking Brake)
245 CID 0133 Solenoid Valve (Transmission Pilot Pressure)
246 CID 0153 Speed Sensor (Right Track)
251 CID 0154 Speed Sensor (Left Track)
411 CID 0168 Electrical System
141 CID 0190 Engine Speed Sensor
144 CID 0444 Magnetic Switch (Start Relay)
252 CID 0468 Position Sensor (Service Brake Pedal)
178 CID 0617 Relay (Intake Air Heater)
426 CID 0650 Harness Code
253 CID 0681 Solenoid Valve (Parking Brake)
434 CID 0817 ECM Internal Backup Battery
422 CID 1482 Sensor Power Supply (10 DCV)
254 CID 1693 Position Sensor (Deceleration Pedal)
255 CID 1699 Position Sensor (Forward/Neutral/Reverse)
256 CID 1700 Position Sensor (Steering)
261 CID 1701 Switch (Acceleration)
262 CID 1702 Switch (Deceleration)
263 CID 1703 Proportional Solenoid (Forward Left Drive Pump)
264 CID 1704 Proportional Solenoid (Reverse Left Drive Pump)
265 CID 1705 Proportional Solenoid (Forward Right Drive Pump)
271 CID 1706 Proportional Solenoid (Reverse Right Drive Pump)
272 CID 1707 Proportional Solenoid (Left Drive Motor)
273 CID 1708 Proportional Solenoid (Right Drive Motor)
435 CID 1960 Ignition Key Reader
Copy and paste this link in your browser to get the jumper plug pinout to see what pins to jump to access your codes without using the Cat ET software connected with a laptop. Let me know what you have for codes.
http://www.mediafire.com/view/gu7zx2t4rllu9gh/Cat_jumper_code_plug_d4g.jpg
Customer: replied 1 year ago.
Code 244 rocker switch parking brake
Customer: replied 1 year ago.
Just cleared code and it's still doing the same thing tried seeing if new code came up and nothing.
Expert:  Dan replied 1 year ago.
thanks for the update. According to the code definition it is a problem with the park brake switch itself. Check the harness and connections to the switch and if ok replace the faulty switch. Some calibrations on this machine if needed might require Cat ET to run through the calibrations for the transmission. Let me know
Customer: replied 1 year ago.
I have ordered the switch I will keep u updated thanks
Expert:  Dan replied 1 year ago.
Sounds good, Pleasure to help.
Customer: replied 1 year ago.
Installed new switch and still doing the same thing. I was wondering if it might be the hydrostatic override solenoid. Also no blink codes came up after I ran it forward and reverse a few times. It feels like there is something restricting the flow of fluid to the finial drives
Expert:  Dan replied 1 year ago.
Thanks for the update. Check the transmission filter for meatal/debris that would indicate an internal failure occurring. Let me know. If you have access to Cat ET, try running through the recalibrations for the transmission. Also here are some other troubleshooting steps.
D3G, D4G and D5G Track-Type Tractors Electrohydraulic/ Speed Indicator
Speed Indicator
System Operation Description:
As the operator presses the buttons for the accelerate/decelerate, the speed display does not respond properly.
The possible causes of this failure are listed below:
The voltage supply J1-69 (wire 709-OR) to the display is open.
The return circuit J1-70 (wire J764-BR) is open.
The signal circuit J2-20 (wire 899-BU) is shorted to the + battery.
The signal circuit J2-20 (wire 899-BU) is open or the speed display is disconnected.
The speed display has failed.
The ECM has failed. This is unlikely.
Test Step 1. CHECK THE SUPPLY CIRCUIT FOR THE SPEED DISPLAY AT THE ECM.
Place the disconnect switch and the key start switch in the ON position.
DO NOT DISCONNECT the machine harness from the ECM. At J1 and J2 connectors of the ECM, prepare to make a voltage measurement by using the 7X-1710 Multimeter Probe .
At the machine harness for the ECM, insert the probe into the back of connectors J1 and J2. Measure the voltage (VDC) between J1-69 (10 volt supply) and J1-70 (10 volt return). Make a note of the measurement.
Measure the voltage at the speed display. Measure the voltage between wire (709-OR) and wire (J764-BR). Make a note of the measurement.
Expected Result:
The voltage measures approximately 10 VDC.
Results:
OK - The voltage measures approximately 10 VDC. The speed display has failed.Repair: Replace the speed display gauge.
STOP
NOT OK - The voltage does NOT measure approximately 10 VDC. The supply circuit is shorted or the ECM has failed. Proceed to Test Step 2.
Test Step 2. CHECK THE SUPPLY CIRCUIT FOR A SHORT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect wire (709-OR) from the speed display.
Disconnect the J1 and J2 machine harness from the ECM.
At machine harness connector J1-69, measure the resistance to all other J1 and J2 contacts.
Expected Result:
The resistance should be greater than 5000 ohms for each measurement.
Results:
OK - The resistance is greater than 5000 ohms for each measurement. The machine harness is correct. Proceed to Test Step 5.
NOT OK - The resistance is not greater than 5000 ohms for each measurement.Repair: There is a short in the machine harness. The short is between the circuit with the low resistance measurement and wire 709-OR. Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN.
The key start switch and the disconnect switch remain in the OFF position.
At the speed display gauge, place a jumper from J2-20 (wire 899-BU) to J1-69 (wire 709-OR).
The J1 and J2 machine harness remains disconnected from the ECM.
At the machine harness connector for the ECM, measure the resistance. Measure the resistance from contact J2-20 to contact J1-69.
Expected Result:
The resistance measurement should be less than 5.0 ohms.
Results:
OK - The resistance measurement is less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 4.
NOT OK - The resistance measurement is not less than 5.0 ohms.Repair: There is an open circuit in the machine harness. The open is in wire 899-BU or wire 709-OR of the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT.
The key start switch and the disconnect switch remains OFF.
Remove the jumper from the speed display gauge.
The machine harness (J1 and J2) remains disconnected from the ECM.
At machine harness connectors, measure the resistance from contact J2-20 (signal) to all other contacts of J1 and J2.
Expected Result:
The resistance should be greater than 5000 ohms for each measurement.
Results:
OK - The resistance is greater than 5000 ohms for each measurement. The machine harness is correct. Proceed to Test Step 5.
NOT OK - The resistance is not greater than 5000 ohms for each measurement.Repair: There is a short in the machine harness. The short is between the circuit with the low resistance measurement and wire 899-BU. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK IF THE FAILURE IS STILL PRESENT.
Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the problem remains.
Expected Result:
The speed display is NOT operating properly.
Results:
YES - The speed display is NOT operating properly. Proceed to Test Step 6.
NO - The speed display is operating properly.Repair: The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP
Test Step 6. CHECK THE PARAMETER SETTING.
Use the Caterpillar Electronic Technician and enter the screen for Status Group 5. See Troubleshooting, "Using Caterpillar Electronic to Determine Diagnostic Codes".
View the parameter for the Current Maximum Speed Setting. Compare the value for the parameter and the value that is on the speed display.
Press and hold the speed down button. The parameter setting on the ET should read approximately 0.217 and the speed display should display the minimum position.
Press and hold the speed up button. The parameter setting on the ET should read approximately 1.0 to 1.35 and the speed display will display 2.25 to 3.Note: The value for the speed display can vary. The variation will depend on the programmed value that was entered with the ET.
Expected Result:
The Current Maximum Speed Setting and the speed display change to the correct values.
Results:
OK - The Current Maximum Speed Setting and the speed display change to the correct values. The indicator is working correctly.STOP
NOT OK - The Current Maximum Speed Setting is correct, but the speed display does NOT have the correct value.Repair: Replace the speed display.
STOP
NOT OK - The Current Maximum Speed Setting does NOT change correctly. Verify that no other diagnostic codes are present.Repair: The problem has not been corrected. It is unlikely that the ECM has failed. Perform the previous Steps again. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
D3G, D4G and D5G Track-Type Tractors Electrohydraulic/ Pressure Switch (Parking Brake)
Pressure Switch (Parking Brake)
System Operation Description:
Schematic of the pressure switch (low park brake)
Test Step 1. CHECK THE NORMALLY CLOSED CIRCUIT FOR PROPER OPERATION.
Turn the key start switch to the ON position. Do NOT start the engine.
Disconnect the pressure switch from the machine harness.
At the machine harness connectors, measure the voltage from contact 1 (wire C491-PU) to contact 2 (wire J764-BR).
Expected Result:
Voltage should be between 4.0 VDC and 5.25 VDC.
Results:
OK - The voltage is with an acceptable range. Proceed to test step 2.
NOT OK - The voltage is not with an acceptable range.Repair: The machine harness has failed. The return circuit (wire J764-BR) is open or the normally closed circuit (wire C491-PU) is open or shorted. Repair the machine harness or replace the machine harness.
STOP
Test Step 2. CHECK THE SWITCH FOR NORMAL OPERATION.
Remove the pressure switch and replace the switch with a gauge that is capable of at least 3000 kPa (435 psi).
Start the engine and run the engine at high idle.
Engage the parking brake. Measure the pressure.
Expected Result:
When the parking brake is engaged, the pressure should be greater than 400 kPa (58 psi).
Results:
OK - The pressure is correct.Repair: The switch has failed. Replace the pressure switch for the hydraulic system pilot. Verify that the new switch corrects the problem.
STOP
NOT OK - The pressure is not correct.Repair: There is a problem with the hydraulic system. Refer to Testing and Adjusting, "Initial Pressure Tests".
STOP
Test Step 3. CHECK IF THE PROBLEM REMAINS.
Clean the contacts of the harness connectors.
Reconnect all harness connections.
Expected Result:
The switch operates correctly.
Results:
OK - The switch operates correctly. The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP
NOT OK - The switch does not operate correctly.Repair: Replace the switch.
STOP
D3G, D4G and D5G Track-Type Tractors Electrohydraulic/ Diagnostic Code List
Diagnostic Code List
Use the Caterpillar Electronic Technician in order to determine the diagnostic codes for the ECM. After determining the diagnostic codes, refer to the corresponding test procedure for more information. Perform the procedure that corresponds to the diagnostic code (CID and FMI). The following table is a list of possible diagnostic codes for the ECM.
Table 1
Diagnostic Codes For Machine ECM (MID No. 079) (1)
For troubleshooting, see the procedure with the same CID And FMI No.
CID / FMI Description
CID 0017 Solenoid Valve (Fuel Shutoff)
FMI 03 Voltage above normal or shorted high.
FMI 05 Current below normal or open circuit.
FMI 06 Current above normal or grounded circuit.
CID 0041 Sensor Power Supply (8 DCV)
FMI 00 Data Valid but above normal operating range.
CID 0070 Rocker Switch (Parking Brake)
FMI 02 Data erratic, intermittent, or incorrect.
FMI 01 Data Valid but below normal operating range.
CID 0110 Temperature Sensor (Engine Coolant)
FMI 03 Voltage above normal or shorted high.
CID 0133 Solenoid Valve (Transmission Pilot Pressure)
FMI 03 Voltage above normal or shorted high.
FMI 05 Current below normal or open circuit.
FMI 06 Current above normal or grounded circuit.
CID 0153 Speed Sensor (Right Track)
FMI 08 Abnormal frequency, pulse width, or period.
CID 0154 Speed Sensor (Left Track)
FMI 08 Abnormal frequency, pulse width, or period.
CID 0168 Electrical System
FMI 03 Voltage above normal or shorted high.
FMI 04 Voltage below normal or shorted low.
CID 0190 Engine Speed Sensor
FMI 08 Abnormal frequency, pulse width or period.
CID 0444 Magnetic Switch (Start Relay)
FMI 03 Voltage above normal or shorted high.
FMI 05 Current below normal or open circuit.
FMI 06 Current above normal or grounded circuit.
CID 0468 Position Sensor (Service Brake Pedal)
FMI 03 Voltage above normal or shorted high.
FMI 04 Voltage below normal or shorted low.
FMI 08 Abnormal frequency, pulse width or period.
CID 0617 Relay (Inlet Air Heater)
FMI 03 Voltage above normal or shorted high.
FMI 05 Current below normal or open circuit.
FMI 06 Current above normal or grounded circuit.
FMI 13 Out of calibration.
CID 0650 Harness Code
FMI 12 Bad device or component failed.
CID 0681 Solenoid Valve (Parking Brake)
FMI 03 Voltage above normal or shorted high.
FMI 06 Current above normal or grounded circuit.
FMI 05 Current below normal or open circuit.
CID 0817 ECM Internal Backup Battery
FMI 04 Voltage below normal or shorted low.
CID 1482 Sensor Power Supply (10 DCV)
FMI 00 Data Valid but above normal operating range.
FMI 01 Data Valid but below normal operating range.
CID 1693 Position Sensor (Deceleration Pedal)
FMI 03 Voltage above normal or shorted high.
FMI 04 Voltage below normal or shorted low.
FMI 08 Abnormal frequency, pulse width or period.
FMI 13 Out of calibration.
CID 1699 Position Sensor (Forward/Neutral/Reverse)
FMI 03 Voltage above normal or shorted high.
FMI 04 Voltage below normal or shorted low.
FMI 08 Abnormal frequency, pulse width or period.
FMI 13 Out of calibration.
CID 1700 Position Sensor (Joystick)
FMI 03 Voltage above normal or shorted high.
FMI 04 Voltage below normal or shorted low.
FMI 08 Abnormal frequency, pulse width or period.
FMI 13 Out of calibration.
CID 1701 Switch (Machine Acceleration)
FMI 02 Data erratic, intermittent, or incorrect.
CID 1702 Switch (Machine Deceleration)
FMI 02 Data erratic, intermittent, or incorrect.
CID 1703 Proportional Solenoid Valve (Forward Left Drive Pump)
FMI 03 Voltage above normal or shorted high.
FMI 05 Voltage below normal or shorted low.
FMI 06 Failure mode not identifiable.
CID 1704 Proportional Solenoid Valve (Reverse Left Drive Pump)
FMI 03 Voltage above normal or shorted high.
FMI 05 Voltage below normal or shorted low.
FMI 06 Failure mode not identifiable.
CID 1705 Proportional Solenoid Valve (Forward Right Drive Pump)
FMI 03 Voltage above normal or shorted high.
FMI 05 Voltage below normal or shorted low.
FMI 06 Failure mode not identifiable.
CID 1706 Proportional Solenoid Valve (Reverse Right Drive Pump)
FMI 03 Voltage above normal or shorted high.
FMI 05 Voltage below normal or shorted low.
FMI 06 Failure mode not identifiable.
CID 1707 Proportional Solenoid Valve (Left Drive Motor)
FMI 03 Voltage above normal or shorted high.
FMI 05 Voltage below normal or shorted low.
FMI 06 Failure mode not identifiable.
CID 1708 Proportional Solenoid Valve (Right Drive Pump)
FMI 03 Voltage above normal or shorted high.
FMI 06 Failure mode not identifiable.
FMI 05 Voltage below normal or shorted low.
CID 1960 ECM Cannot Communicate With the Electronic Key Reader
FMI 09 Abnormal Update.
( 1 ) For the Machine ECM, the MID is 079. This table pertains only to diagnostic codes with a MID of 079.
D3G, D4G and D5G Track-Type Tractors Electrohydraulic/ General Information
General Information
The diagnostics for a system's ECM can be accessed through the Caterpillar Electronic Technician (ET). Troubleshooting a system requires additional information from the machine's Service Manual. The additional manuals that may be required are the Electrical System Schematic, the Parts Manual and the Operation and Maintenance Manual for the machine that is being serviced.
As a guide, a simplified system schematic is included at the end of this manual. For an accurate representation of the machine that is being diagnosed, refer to Electrical System Schematic in the Service Manual for the machine that is being serviced.
When the troubleshooting procedure instructs you to "REPAIR THE HARNESS", use the Electrical System Schematic for the machine that is being serviced to trace the circuit. Perform continuity checks at the harness connectors in order to locate harness failures. At the connectors of the components, always check the ground circuit. Less than five ohms of resistance is required between the ground contacts of the connector and the frame ground. Excessive ground resistance that is greater than five ohms can cause incorrect diagnosing of problems.
During troubleshooting, inspect all connections before any component is replaced. If these connections are not clean and tight, permanent electrical problems or intermittent electrical problems can result. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are made.
If wire insulation is punctured during troubleshooting, repair the damage. Seal the damaged wires with 8T-0065 RTV Silicone Sealant. Cover the sealant with two layers of 1P-0810Tape .
Failure of an electrical component can cause the failure of other components. Also, failure of an electrical component can be caused by the failure of other components. Always attempt to correct the cause of an electrical system failure before you replace a component.
When you are removing the machine harness from any ECM, use the single screw in the center of the harness connector.
Visual Inspection
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.
----------------------
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 work tools have been lowered to the ground, 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.
----------------------
Perform a visual check on the hydrostatic system and a visual check on the components before troubleshooting a problem. Next, perform the performance tests and the operational checks. Finally, perform the instrument tests.
To remove the hydraulic tank's filler cap, slowly turn the filler cap. If oil begins to escape from the hydraulic tank, allow the tank pressure to decrease before the oil filler cap is completely removed. Before any operational checks are made to the hydrostatic system, visually inspect the system.
Measure the level of the oil in the hydraulic tank.
Look for air in the oil that is in the hydraulic tank. Look for air in the oil immediately after the machine is stopped and the pressure has been relieved. Use a clear bottle in order to obtain a sample of the oil. Look for air bubbles in the oil that is in the bottle.
Check all oil lines, hoses and connections for damage or leaks.
Check for restrictions of flow. Check for sharp bends and clamps that are not installed correctly. Check for physical damage to hoses and lines.
Remove the filter elements. Use a 4C-5084 Filter Cutter to cut the filter element open. Spread apart the pleats and inspect the element for metal and for other debris. An excessive amount of debris in the filter element can indicate a possible failure. If metals are found in the filter element, a magnet can be used to differentiate between ferrous metals and nonferrous metals. Ferrous metals can indicate wear on steel parts and on cast iron parts. Small amounts of debris may be found in the filter element. This could be caused by friction and by normal wear. Consult your Caterpillar dealer in order to arrange for further analysis if an excessive amount of debris is found. Using an oil filter element that is not recommended by Caterpillar can result in severe damage to parts. This can result in larger particles in unfiltered oil. The particles could enter the lubricating system and the particles could cause damage.
Operation Checks
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.
----------------------
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 work tools have been lowered to the ground, 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.
----------------------
The operation checks can be used to find leakage in the system and the operation checks can analyze the overall performance of the machine. The checks can be used to determine whether the pilot control valve is functioning properly. The checks can also be used to determine whether each pump or each motor is functioning properly.
The oil in the hydraulic system must be at an operating temperature of 40 to 55°C (104 to 131°F).
The crossover relief valves and the POR valves are specific to the individual track circuits. Each track circuit operates independently. The left side hydrostatic circuit operates independently of the right side hydrostatic circuit.
Direction, travel speed and steering are controlled electronically through the ECM. The ECM can cause the pumps to upstroke and the ECM can cause the pumps to destroke at the same time.
Each of the two charge circuits has a specific function. The front hydrostatic pump's charge circuit provides charge oil to the circuit of the left track and to the circuit of the winch. The rear hydrostatic pump's charge circuit provides charge oil to the circuit of the right track. The rear hydrostatic pump's charge circuit provides oil to the parking brake. The charge pumps provide cooling and flushing oil to the drive motors.
Customer: replied 1 year ago.
I tested at the speed gauge and wire 709 had 10 volts and j794 had .02 volts
Expert:  Dan replied 1 year ago.
Thanks for the update. If you did not get the expected 10 volts then move to step 2 and follow the step until it isolates the source of the problem. Let me know the results of the rest of the testing if you need more help
Customer: replied 1 year ago.
How many volts should the solenoids for forward and reverse be receiving when the machine is running parking brake off and in gear
Customer: replied 1 year ago.
I unplugged one of the forward solenoids and tested it it jumped up to around 5.5 and went back down to 1.3 vdc and had a constant 1.3 in or out of gear
Expert:  Dan replied 1 year ago.
Thanks for the update. It is starting to look like either a harness problem or ECM failure. Check the battery to starter connections and grounds to be sure you have full voltage to the ECM. Once confirmed Run through the tests above in order and if OK see the next step and if not ok it will tell you what component is as fault but you will need to follow the steps in order. Some of them unfortunately require Cat ET to diagnose. If you know someone with Cat ET it will help speed the process as it will take the guess work out of the troubleshooting process and also you will be able to run through the recalibration process through Cat ET to help confirm or eliminate an ECM problem. Let me know Also what is your serial number? Have you checked your pressures? This problem might be pump related. I would check to see if your pressures are within specs and if there is any metal/debris in your filter.
Customer: replied 1 year ago.
Tested J1-69 at the ECM individually and that had 10 volts. Tested J1-70 at the ECM individually and that had 0 volts. What do u think
Expert:  Dan replied 1 year ago.
thanks for the update. Just be sure you tested with the harness plug connected to the ECM and not unplugged as that is the 10V send and return. You should see 10 Volts ans if not you have either a failed ECM or short in the supply circuit. Continue on following the flow chart and steps below to narrow it down. Do not skip any steps. Let me know.
Expected Result:
The voltage measures approximately 10 VDC.
Results:
OK - The voltage measures approximately 10 VDC. The speed display has failed.Repair: Replace the speed display gauge.
STOP
NOT OK - The voltage does NOT measure approximately 10 VDC. The supply circuit is shorted or the ECM has failed. Proceed to Test Step 2.
Test Step 2. CHECK THE SUPPLY CIRCUIT FOR A SHORT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect wire (709-OR) from the speed display.
Disconnect the J1 and J2 machine harness from the ECM.
At machine harness connector J1-69, measure the resistance to all other J1 and J2 contacts.
Expected Result:
The resistance should be greater than 5000 ohms for each measurement.
Results:
OK - The resistance is greater than 5000 ohms for each measurement. The machine harness is correct. Proceed to Test Step 5.
NOT OK - The resistance is not greater than 5000 ohms for each measurement.Repair: There is a short in the machine harness. The short is between the circuit with the low resistance measurement and wire 709-OR. Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN.
The key start switch and the disconnect switch remain in the OFF position.
At the speed display gauge, place a jumper from J2-20 (wire 899-BU) to J1-69 (wire 709-OR).
The J1 and J2 machine harness remains disconnected from the ECM.
At the machine harness connector for the ECM, measure the resistance. Measure the resistance from contact J2-20 to contact J1-69.
Expected Result:
The resistance measurement should be less than 5.0 ohms.
Results:
OK - The resistance measurement is less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 4.
NOT OK - The resistance measurement is not less than 5.0 ohms.Repair: There is an open circuit in the machine harness. The open is in wire 899-BU or wire 709-OR of the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT.
The key start switch and the disconnect switch remains OFF.
Remove the jumper from the speed display gauge.
The machine harness (J1 and J2) remains disconnected from the ECM.
At machine harness connectors, measure the resistance from contact J2-20 (signal) to all other contacts of J1 and J2.
Expected Result:
The resistance should be greater than 5000 ohms for each measurement.
Results:
OK - The resistance is greater than 5000 ohms for each measurement. The machine harness is correct. Proceed to Test Step 5.
NOT OK - The resistance is not greater than 5000 ohms for each measurement.Repair: There is a short in the machine harness. The short is between the circuit with the low resistance measurement and wire 899-BU. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK IF THE FAILURE IS STILL PRESENT.
Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the problem remains.
Expected Result:
The speed display is NOT operating properly.
Results:
YES - The speed display is NOT operating properly. Proceed to Test Step 6.
NO - The speed display is operating properly.Repair: The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP
Test Step 6. CHECK THE PARAMETER SETTING.
Use the Caterpillar Electronic Technician and enter the screen for Status Group 5. See Troubleshooting, "Using Caterpillar Electronic to Determine Diagnostic Codes".
View the parameter for the Current Maximum Speed Setting. Compare the value for the parameter and the value that is on the speed display.
Press and hold the speed down button. The parameter setting on the ET should read approximately 0.217 and the speed display should display the minimum position.
Press and hold the speed up button. The parameter setting on the ET should read approximately 1.0 to 1.35 and the speed display will display 2.25 to 3.Note: The value for the speed display can vary. The variation will depend on the programmed value that was entered with the ET.
Expected Result:
The Current Maximum Speed Setting and the speed display change to the correct values.
Results:
OK - The Current Maximum Speed Setting and the speed display change to the correct values. The indicator is working correctly.STOP
NOT OK - The Current Maximum Speed Setting is correct, but the speed display does NOT have the correct value.Repair: Replace the speed display.
STOP
NOT OK - The Current Maximum Speed Setting does NOT change correctly. Verify that no other diagnostic codes are present.Repair: The problem has not been corrected. It is unlikely that the ECM has failed. Perform the previous Steps again. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
D3G, D4G and D5G Track-Type Tractors Electrohydraulic/ Pressure Switch (Parking Brake)
Pressure Switch (Parking Brake)
System Operation Description:
Schematic of the pressure switch (low park brake)
Test Step 1. CHECK THE NORMALLY CLOSED CIRCUIT FOR PROPER OPERATION.
Turn the key start switch to the ON position. Do NOT start the engine.
Disconnect the pressure switch from the machine harness.
At the machine harness connectors, measure the voltage from contact 1 (wire C491-PU) to contact 2 (wire J764-BR).
Expected Result:
Voltage should be between 4.0 VDC and 5.25 VDC.
Results:
OK - The voltage is with an acceptable range. Proceed to test step 2.
NOT OK - The voltage is not with an acceptable range.Repair: The machine harness has failed. The return circuit (wire J764-BR) is open or the normally closed circuit (wire C491-PU) is open or shorted. Repair the machine harness or replace the machine harness.
STOP
Test Step 2. CHECK THE SWITCH FOR NORMAL OPERATION.
Remove the pressure switch and replace the switch with a gauge that is capable of at least 3000 kPa (435 psi).
Start the engine and run the engine at high idle.
Engage the parking brake. Measure the pressure.
Expected Result:
When the parking brake is engaged, the pressure should be greater than 400 kPa (58 psi).
Results:
OK - The pressure is correct.Repair: The switch has failed. Replace the pressure switch for the hydraulic system pilot. Verify that the new switch corrects the problem.
STOP
NOT OK - The pressure is not correct.Repair: There is a problem with the hydraulic system. Refer to Testing and Adjusting, "Initial Pressure Tests".
STOP
Test Step 3. CHECK IF THE PROBLEM REMAINS.
Clean the contacts of the harness connectors.
Reconnect all harness connections.
Expected Result:
The switch operates correctly.
Results:
OK - The switch operates correctly. The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP
NOT OK - The switch does not operate correctly.Repair: Replace the switch.
STOP
Customer: replied 1 year ago.
When I tested J1-69 and 70 the key was in the on position and J1 J2 were plugged into the ECM
Customer: replied 1 year ago.
J1-70 should have 10 volts cause that's the return from the speed gauge correct?
Expert:  Dan replied 1 year ago.
Yes that is correct. Is the speed display responding but the problem you have is the machine is not moving? I would check the filter and suction screen for metal/ debris and the oil for burnt smell/discoloration and if found it is an indication of internal problems instead of electrical and a pressure test will also confirm a pump or converter problem. Let me know. This could be a mechanical problem.

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