 |
Rotating fan blades can result in personal injury or death. Stop the engine and allow the fan to come to a complete stop before making any test or adjustment. Before starting the engine, make sure all of the finger guards are installed and the guard door is closed. Do not allow any tools or test equipment to protrude or vibrate into the path of the rotating fan blades. |
 |
|
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 attachments have been lowered, 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. |
|
|
Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
|
| NOTICE |
|---|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
Specifications
| Fan Pump Supply Pressure | ||
|---|---|---|
| Date | Equipment ID Code | |
| Pump Pressure | Standard | Actual |
| Margin Pressure | 1800 ± 100 kPa (261 ± 14 psi) |
|
| High Pressure Cutoff | 19388 ± 350 kPa (2812 ± 50 psi) |
|
| Hydraulic Fan Speed | |||
|---|---|---|---|
| Date | Equipment ID Code | ||
| Minimum Setting | Maximum Setting | Actual | |
| Hydraulic Fan Speed | 650 ± 50 rpm | 1500 ± 50 rpm | |
Introduction
This information includes the following test and adjust procedures:
- Margin Pressure
- High Pressure Cutoff
- Hydraulic Fan Speed
Required Tools
| Required Tools | ||
| Part Number | Description | Qty |
| 308-7264 | Multitach | 1 |
| 348-5430 | Multi-Tool | 1 |
| NETG5049 | Software License Card | 1 |
| 8T-0859 | Pressure Gauge (0 TO 25,000-KPA (0 TO 3,600-PSI)) | 2 |
Test Preparation
ReferenceTesting and Adjusting, "Machine Preparation for Troubleshooting"
ReferenceTool Operating Manual, NEHS1087, "348-5430 Multi-Tool Group 2"
ReferenceFor information about preparing a machine for troubleshooting, refer to the Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
- Move the machine to a smooth horizontal location. Move away from working machines and personnel. Lower the work tools to the ground.
- Allow only one operator on the machine. Keep all personnel away from the machine or in the view of the operator.
- Engage the parking brake.
- Place the steering frame lock in the LOCKED position.
 | |
| Illustration 1 | g00893065 |
Fan Speed (Test)
In order to check the speed of the hydraulic fan motor, use a 308-7264 Multitach. The multitach measures the hydraulic fan rpm by using reflective tape and a photo pickup.
- Ensure that the key start switch is in the OFF position. Access to the fan blade is through left side of radiator group. Remove access plate (1) .
 | |
| Illustration 2 | g00799694 |
Side View of the Radiator Group | |
- Place photo pickup (2) into the holder on magnetic base (3) and tighten the screw. Attach magnetic base (3) to the fan guard assembly.
Note: When you start the engine, vibration of the machine may cause the photo pickup to become misaligned. If necessary, adjust the position of magnetic base (3) in order to realign photo pickup (2) .
 | |
| Illustration 3 | g03094561 |
 | |
| Illustration 4 | g03094562 |
- Reflective tape is already installed on the fan blade. When the reflective tape and photo pickup (2) are in alignment, the LED indicator (red light) will come on. Position photo pickup (2) accordingly.
Margin Pressure (Testing and Adjusting)
- Connect 2 25000 kPa (3600 psi) pressure gauges to quick disconnects (7), (8) on the pump discharge line and on the load sensing line.
 | |
| Illustration 5 | g01197344 |
Location of Brake and Fan Drive Pump (Right Side View) (5) Engine. (6) 254-5146 Piston Pump Gp | |
 | |
| Illustration 6 | g01197348 |
254-5146 Piston Pump Gp (6) Pump. (7) Load Sensing Port. (8) Pump Discharge Port. (9) High Pressure Cutoff Spool. (10) Margin Spool. | |
Note: Ensure that the brake accumulators are fully charged before you begin the following procedure. While the brake accumulators are charging, high pressure will be at the load sensing port.
- Ensure that the hydraulic oil is at operating temperature. Place the transmission in NEUTRAL. Run the engine at low idle.
- The difference between the 2 gauges is the margin pressure. The margin pressure should be 1800 ± 100 kPa (260 ± 15 psi).
- If the margin pressure is out of the range, then remove the cap from margin spool (10) on the pump compensator. Adjust the margin spool until the differential is 1800 ± 100 kPa (260 ± 15 psi). Replace the cap on the margin spool.
High Pressure Cutoff (Testing and Adjusting)
- Connect a 25000 kPa (3600 psi) pressure gauge to the quick disconnect on pump discharge line (8) .
- Disconnect the fan solenoid.
- Run the engine at high idle.
- The pressure at the pump discharge port should be 19388 ± 350 kPa (2812 ± 50 psi).
- If the pressure at the pump discharge port is not 19388 ± 350 kPa (2812 ± 50 psi), then remove the cap from high-pressure spool (9) on the pump compensator. Continue to run the machine at high idle. Adjust the high-pressure spool until the gauge reads 19388 ± 350 kPa (2812 ± 50 psi). Replace the cap on the high-pressure spool.
- Reconnect the fan solenoid when the adjustment is completed.
Hydraulic Fan Speed (Testing and Adjusting)
- Place the transmission in the NEUTRAL position. Engage the parking brake. Connect Caterpillar Electronic Technician (ET) to the diagnostic connector (11) .
 | |
| Illustration 7 | g03095098 |
- Start ET. When ET initializes, select the engine ECM from the choices that are available. Refer to Illustration 8.
 | |
| Illustration 8 | g01197347 |
- Check all Fault Codes under the engine ECM. Ensure that no faults are present in the fan drive system. Ensure that no faults are present with the hydraulic oil temperature sensor, the engine coolant temperature sensor, or the inlet manifold temperature sensor. If no faults are present, begin the calibration. Select "Service > Calibrations > Engine Cooling Fan Calibration". Refer to Illustration 9.
 | |
| Illustration 9 | g01197353 |
- The screen that is shown in Illustration 10 will appear. Follow the instructions on the screen. Click on "OK".
 | |
| Illustration 10 | g01197346 |
- The "Calibrations" screen will appear. Select both check boxes and click on "Begin".
 | |
| Illustration 11 | g01197350 |
- Ensure that the parking brake is set. Run the engine at high idle. Click on "Next" in the lower left corner of the screen.
 | |
| Illustration 12 | g01197341 |
- Continue running the machine at high idle. Use the photo tach to measure the fan speed. Adjust the current for the fan solenoid by using the arrows at the bottom of the screen. Increasing the current will decrease the fan speed. Decreasing the current will increase the fan speed. Adjust the current until the fan speed is 1500 ± 50 rpm.
Note: The procedure on the screen may specify a different value for the fan speed. Do not use this value. Set the fan speed according to the above instructions.
When the fan speed has been set properly, click the "Next" button in the lower left corner of the screen.
 | |
| Illustration 13 | g01197357 |
- After setting the maximum fan speed, click on "Continue" in order to set the minimum fan speed.
 | |
| Illustration 14 | g01197355 |
- Continue running the machine at high idle. Use the photo tach to measure the fan speed. Adjust the current for the fan solenoid by using the arrows at the bottom of the screen. Increasing the current will decrease the fan speed. Decreasing the current will increase the fan speed. Adjust the current until the fan speed is 650 ± 50 rpm.
Note: The procedure on the screen may specify a different value for the fan speed. Do not use this value. Set the fan speed according to the above instructions.
When the fan speed has been set properly, click the "Next" button in the lower left corner of the screen.
 | |
| Illustration 15 | g01197354 |
- After setting the minimum fan speed, click on "Finish" in order to save calibration values. Exit ET.
 | |
| Illustration 16 | g01197358 |