How to deal with the fault of Caterpillar excavator 320C oil temperature being too high

 What to do if the oil temperature of Carter excavator 320C is too high?

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 During the use of excavators, many drivers have encountered the "problem of oil 

temperature being too high", and even the "mechanical thermal deformation, the moving 

parts with different thermal expansion coefficients in the hydraulic components are stuck 

due to the smaller matching clearance, causing the action to fail, affecting the transmission 

accuracy of the hydraulic system, and causing the working quality of the parts to 

deteriorate." A series of problems such as "Analysis of causes:

1 The hydraulic oil of the excavator has not been replaced for too long 

2 The hydraulic pump has failed

 3 The computer board is faulty or the setting is wrong 

4 The oil tank capacity is too small, the heat dissipation area is not enough, the oil cooling device is not installed, or the cooling device is too small 

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Solution: 

1 If your excavator hydraulic oil has not been replaced for more than 6000 hours, the hydraulic oil must be replaced 

2 Have professionals inspect and debug the hydraulic pump

 3 Reset or repair the computer board 4 Install a cooling device with a capacity that matches the oil tank

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What to do? There is a coolant smell in the cab of the 311B EXCAVATOR 2LS.

 This article describes how to handle a coolant smell in the cab of a 311B EXCAVATOR 2LS.

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Possible Cause 1

There is a leak in the hose or hose clamp. 

 

1. Check the connection between the heating coil and the heater hose. 

 

 2. Check the hose for damage. 

 

3. Check to make sure the hose clamp is tightened to the torque value shown in the dimensional 

drawing.

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  Possible Cause 2 

There is a leak in the heating coil. 

 

1. Check the heating coil for obvious cracks or holes in the tubing. 

 

2. Check to make sure the hose clamp is tightened to the correct torque. 

 

 

Possible Cause3

 There is a leak in the water valve. 

 

1. Check the water valve for any damage. 

 

 2. Check to make sure the hose clamp is tightened to the correct torque. 

 

3. If the water valve is OK during these two initial tests, refer to Troubleshooting, SENR5664, 

"Troubleshooting for Heating and Air Conditioning Control Systems".

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how to deal with the heat in the 311B EXCAVATOR 2L cab.Control Failure

This article describes how to deal with the heat in the 311B EXCAVATOR 2L cab.Control Failure

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Possible Cause 

1 The water valve is not installed correctly, or the valve is installed backwards. 1. If the machine is equipped with a water valve control, check the water valve to make sure it is installed correctly. 

2. Some water valves have an arrow on the side of the valve body indicating the direction of water flow. Make sure the arrow points to the line leading to the heating coil. 

3. If the machine is equipped with a cable-actuated water valve, make sure the cable is not wrapped around the water valve or the frame. 

4. If the machine is equipped with an electric water valve, make sure the actuator is securely attached to the water valve. 

 Possible Cause 2 

There is an electrical problem with the control panel. 

1. Check the control panel to make sure that power is being supplied to the control panel after the machine is started. 

 2. Check to make sure that the wiring harness is connected to the control panel. 

3. Check the wiring harness for any damage and exposed wires. 

4. Check the circuit breaker or fuse to make sure there is no open circuit in the system.

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Possible Cause 3 

The water valve cable or potentiometer is faulty. 

 1. Determine the type of water valve control used on the machine. 

2. If the water valve has a cable connected, proceed to step

 3. If the machine has a built-in potentiometer, proceed to step 5. 3. Check to make sure the cable is connected to the water valve handle. 

4. Check the water valve to make sure it fully opens when the temperature control knob is turned to the hottest position. 

 5. Check to make sure the potentiometer is connected to the wiring harness in the cab instrument panel.

  6. Check the water valve to make sure it fully opens when the temperature control knob is turned to the hottest position.

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311B EXCAVATOR 2LS excavator heating system fault diagnosis and troubleshooting

 All Air Conditioning and Heating Products for Caterpillar Machines with R134a 

The following problem-solving information applies to locating and correcting problems in the heating system. Different problems may cause the same or similar system conditions (symptoms). Refer to Testing and Adjusting, SENR 5664, "Heater Performance - Tests" to evaluate the performance of the system before beginning the procedures to correct the problem. The problem must be diagnosed first. If any parts are found to be damaged during the inspection, repair or replace them. 

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Possible Cause 1 Blower motor does not operate.

  1. Check circuit breaker or fuse box to make sure there is no open circuit in the system. 

2. Visually inspect wiring harness for broken wires and missing connectors. Refer to each machine's electrical schematic to make sure connections are correct. 

 3. Check fan blades to make sure they are not obstructed or stuck.

  4. Check fan switch for proper operation at each setting. The blower motor should be able to operate at a variety of settings and temperatures.

 

Possible Cause 2 There is a leak in the system. 

 1. Check the hose clamps to make sure they are not missing and are tightened to the torque values ​​shown in the diagram. 

 2. Check the heating coils for obvious cracks or leaks. 

3. Check the water valves to make sure they are installed correctly and functioning properly. 

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Possible Cause 3 The inlet/outlet of the engine cooling system is closed. 

 1. Check the valve connecting the heater hose to the engine block. 

2. Make sure the valve is adjusted to fully open. Possible Cause 

4 The hose connecting the system is kinked or blocked. 

 1. Check the hose for blockages or bends. Blockages and bends in the heater hose will restrict the flow of coolant, and blockages will also reduce the performance of the entire heating system.

  2. Replace any hoses that may restrict the flow of coolant.

Possible Cause 5

 The heater's controls are malfunctioning. 

 1. Determine the type of controls used on the machine. 

2. If the system is equipped with a water valve, proceed to step 

3. If the system is equipped with a blend door, proceed to step 6. 3. Inspect the water valve for signs of damage. 

4. Inspect the water valve to make sure it fully opens when the temperature control knob is turned to the hottest position. 

 5. If the water valve will not open or close, go to "Possible Cause 6". 

6. Inspect the blend door. 

7. Inspect the blend door for any damage. 

 8. Make sure the insulation on the blend door is intact. 

9. Make sure the actuator is connected to the blend door. 

10. Inspect the blend door to make sure it fully opens when the temperature control knob is turned to the hottest position.

 

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 Possible Cause 6 

The water valve cable or potentiometer is faulty. 

 1. Determine the type of water valve control the machine has. 

 2. If the water valve has a cable attached, proceed to step 

3. If the machine has a built-in potentiometer, proceed to step 5. 3. Inspect the machine to make sure the cable is connected to the water valve handle. 

4. Inspect the water valve to make sure the water valve is fully open when the temperature control knob is turned to the hottest position. 

 5. Inspect the machine to make sure the potentiometer is connected to the wiring harness in the cab instrument panel. 

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 6. Inspect the water valve to make sure the water valve is fully open when the temperature control knob is turned to the hottest position.

 

 

311B EXCAVATOR 2LS FAULT CODE MID 161 - CID 1251 - FMI 03 FAULT CODE RESOLUTION

 This article describes the solution to the 311B EXCAVATOR 2LS fault code

Situation where this code is generated:

The PL522 or 523 module tracks machine hours for reporting to the office. The alternator R-terminal signal is used to detect when the machine is operating. If the input continuously receives a voltage signal above the normal range, machine operation will not be detected. The reported service meter hours (SMU) will also be inaccurate.

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TEST STEPS 1. Check if the R-terminal cable is shorted to the battery. A. Disconnect the PL522 or 523 cable (P1) from the PL522 or 523 module. 

B. Measure the resistance of the alternator R-terminal input J1-4 (403MC9-GN-18) to the battery (J1-1). Expected Results: The resistance should be greater than 5000 ohms.

 Results:  

• OK - The PL522 or 523 harness appears normal. Go to Test Step 2. • Not OK - The PL522 or 523 cable may be shorted to the battery. Repair: Repair the cable and verify that the problem has been corrected.

Stop 

Test Step 2. Check the PL522 and 523 harnesses for shorts to the voltage source. 

A. Disconnect the PL522 or 523 cable (P1) from the PL522 or 523 module. 

B. Start the engine. 

C. Measure the alternator R-terminal input (J1-4) to verify that there is a square wave of 11 VDC to 32 VDC. The measurement result should be in the range of 5Hz to 2 kHz, or a stable DC voltage equivalent to the battery voltage is present. 

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Expected Result: No stable DC voltage equivalent to the battery voltage is measured when measuring the alternator R-terminal input.

Result: • OK - The signal is a square wave of 11 VDC to 32 VDC. The measurement result should be in the range of 0Hz to 2 kHz , or a steady DC voltage equal to the battery voltage is present. The PL522 or 523 harness may not be faulty.  

Go to Test Step 3.  

• Not OK - The PL522 or 523 cable may be shorted to a DC power source other than the battery power source. Repair: Repair the cable and verify that the fault has been corrected. Stop Test Step 3. Check the Machine Alternator. A. Disconnect the PL522 or 523 machine cable from the alternator. B. Start the engine. C. Use a multimeter to measure the alternator R-terminals to verify that there is an 11 VDC to 32 VDC square wave. The measurement results should be in the range of 0 kHz to 2 kHz. Expected Results: There should be an 11 VDC to 32 VDC square wave at the alternator R-terminals at 0 kHz to 2 KHz.

Result: • OK - A 0 kHz to 2 KHz 11 VDC to 32 VDC square wave is present at the alternator R-terminals. Go to Test Step 4. • NOT OK - A 0 kHz to 2 KHz 11 VDC to 32 VDC square wave is not present at the alternator R-terminals. Repair: Repair or replace the alternator. 

Stop Test Step 4. Check if this diagnostic code is still active. A. Clean all contacts at the harness connectors. B. Reconnect all harness connectors. C. Turn the key start switch to the ON position and operate the machine. D. Use Caterpillar Electronic Technician (Cat ET) to determine if a "CID 1251 FMI 03" diagnostic code is present.

Expected Result: A "CID 1251 FMI 03" diagnostic code is present. 

Result: https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis... Wednesday, October 17, 2018

• Yes - The fault has not been corrected. An ECM fault is unlikely. Repair: Repeat this diagnostic test procedure. If the cause of the diagnostic code is not found, replace the Product Link ECM. Before replacing the PL522 or 523, contact your Caterpillar Technical Communicator. Refer to System Operation, Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop

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• No - No diagnostic code exists. The fault does not exist at this time. The original fault may have been caused by a poor electrical connection or short in a harness connector that was disconnected and reconnected. Resume normal machine operation. Stop 

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312D2 and 313D2 Excavators, Machine Systems Duo-Cone Universal Floating Seal - Installation

  This article describes the 312D2 and 313D2 excavators, machine systems Duo-Cone Universal Floating Seal - Installation

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Correct Assembly of Universal DuoCone Seals Assembly and Installation Procedures

Correct Assembly of Universal DuoCone Seals Assembly and Installation Procedures 1. Clean any oil film, dust or other foreign matter from the following components:

 ◦ Rubber Toric Ring (2)

 ◦  Housing Bevel (4)

 ◦ Seal Ring Bevel (7) 

◦ Housing Retaining Lip (3) 

◦ Seal Retaining Lip (8) 

◦ Seal Ring Housing (5)

Note: The seal has very sharp edges. Injury should be avoided by wearing protective gloves.

Use the cleaner in Tool (B) or isopropyl alcohol or other approved cleaner. Wipe with a clean, lint-free cloth. All components should be completely dry before continuing work.

Note: Be careful not to allow oil to come into contact with the rubber toric ring (2), housing bevel (4) or seal ring bevel (7) until both seals (1) are assembled in final position. 

 

 

 

 2. Place the rubber toric ring (2) onto the seal (1). Make sure the rubber toric ring is at the bottom of the seal bevel (7). The rubber toric ring must seat onto the retaining lip (8). The rubber toric ring must be straight inside the seal. The rubber toric ring must not be twisted.

Note: Handle the rubber toric ring with care. Nicks, cuts, and scratches can cause leaks 

 

 4. Install the rubber toric ring (2) onto the seal (1) using the installation tool (9). Lightly lubricate the lower portion of the rubber toric ring (2) with a suitable lubricant. Refer to "Acceptable assembly lubricants" in this document for more information.

Lubricate the rubber toric ring using the following steps: ◦ Wipe the seal with a lint-free cloth. ◦ Place a foam towel or pad in the bottom of the container. Saturate the towel or pad with lubricant. Immerse the rubber toric ring in the container.

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 5. Ensure that the lower part of the rubber toric ring (2) is still wet. Using the installation tool (9), press the seal (1) and rubber toric ring (2) straight against the seal housing (5). When pressing down on the smaller diameter toric ring, ensure that you apply sudden and even pressure. Press the rubber toric ring (2) under the housing retaining lip (3) that is part of the seal housing (5). Install the larger diameter rubber toric ring using the following steps:

 ◦ Push the rubber toric ring over the seal retaining lip on one side. 

 ◦ Use a rubber hammer to tap the installation tool on the opposite side of the rubber toric ring. Keep tapping until the rubber toric ring slides over the housing seal retaining lip.

 

 

 6. Use Tool (A) to check the assembly height (B) at four locations at 90 degrees. The height difference must not exceed 1.0 mm (0.04 in). Refer to Figure 6.

 

 7. Never adjust the seal (1) by pushing or pulling it. Use the installation tool (9) to press the seal down.

 

 8

The rubber toric ring (2) may be twisted during installation if the seal is not fully wetted or if the housing retaining lip (3) that is part of the seal housing (5) has burrs or fins. Misalignment, twisting and bulging of the rubber toric ring will cause damage to the DuoCone seal. If improper installation is suspected, remove the toric ring from the housing and repeat the installation process.

 

9

Wipe the seal face (6) which is part of the seal (1) with a lint-free cloth. No particles should remain on the sealing surface. A small piece of paper towel can separate the seal face and cause leakage. Note: The rubber toric ring (2) must not slip on the bevel of the seal (1) or the bevel of the seal housing (5). To prevent slipping, allow sufficient time for the lubricant to evaporate before continuing the procedure. Once the rubber toric ring is properly positioned, it can only roll on the bevel.

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10

Apply a thin coat of clean oil to the entire face of the seal ring on one or both of the two seals. Use a lint-free cloth or brush to distribute the oil evenly. Be careful not to allow the oil to contact the rubber toric ring. Lubricate the seal faces with the same lubricant used in the assembly. The oil used in the assembly may have dye added to it. Lubricate the seal faces with the same lubricant that does not contain dye.

 

11. Make sure the two seal housings (5) are correctly aligned and concentric. Move the parts slowly and steadily.
Note: Do not press the seal and seal housing together suddenly. If the seal parts are pressed together suddenly, it may cause scratches or cracks on the seal parts.

12. After the parts are correctly in place, tighten the bolts.

Consequences of Improper Assembly

   

Slipping of the rubber toric ring on the housing bevel or seal bevel can cause uneven pressure on the seal surface. Uneven pressure on the seal surface can cause abrasions, scratches and leaks.
If the rubber toric ring slips locally on the seal ring, the toric ring will be twisted.
A rough toric ring may be distorted.
A warped seal will cause uneven bed force on the seal surface. A warped seal can also cause abrasions, scratches and leaks.
A twisted toric ring will oscillate when it rotates. An oscillating seal may allow dirt to enter the seal joint. This is caused by the suction effect caused by the oscillation of the toric ring.

 

 

The above image shows a misassembled toric ring. The upper housing is stationary. The lower housing rotates.

 

    The figure above shows the same seal  after the lower body has been rotated 180 degrees. At this point, high pressures will exist at points () and 0. These high pressure points can cause scratches on the toric ring - low pressures will exist at points () and (Y) which may cause leaks.