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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
| NOTICE |
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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. |
| NOTICE |
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When the compensator is rebuilt, make sure that the pressure compensator adjustment is backed out to a low pressure setting before the engine is started. Otherwise, severe pump and system damage can result. |
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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. |
| 966M/972M XE Implement Pump Pressure | ||
|---|---|---|
| Date | Equipment ID Code | |
| Pump Pressure | Setting | Actual |
| Implement Pump Discharge Pressure | |
|
| Implement Pump Load Sense Pressure | |
|
| 966M/972M XE Torque Specifications | |
|---|---|
| Callout | Torque |
| Locknut (3) | |
This information includes the following test:
- Implement Pump Discharge Pressure
- Implement Load Sense Pressure
This information includes the following adjustment procedure:
- Adjustment Procedure
| |
| Illustration 1 | g03630357 |
|
Tooling (A) 198-4240 Digital Pressure Indicator Gp | |
| Tool | Item | Qty | Part No | Description |
|---|---|---|---|---|
| A | 198-4240 | Digital Pressure Indicator Gp | ||
| A1 | 1 | 198-4234 | Digital Indicator | |
| A2 | 1 | 198-4237 | Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi)) |
|
| A2 | 1 | 198-4238(1) | Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi)) |
|
| A2 | 1 | 198-4239 | Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi)) |
|
| A2 | 1 | 251-9600(2) | Pressure Sensor Gp
(0 to 68,900 kPa (0 to 10,000 psi)) |
|
| A3 | 1 | 198-4236 | Adapter Cable As | |
| (1) | This sensor must be purchased separately. The sensor is not included in the 198-4240 Digital Pressure Indicator Gp |
| (2) | This sensor can only be used on large diameter pressure taps like 6V-3965 Fitting. |
Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting".
Refer to Testing and Adjusting, "System Pressure Release".
- Move steering frame lock to the LOCKED position.
- Prepare the machine for testing by completing the procedure that is specified in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
| |
| Illustration 2 | g03630356 |
|
Steering Frame Lock in the LOCKED Position | |
Load sense pressure can be checked in the same way as implement discharge pressure. Checking the load sense pressure will provide an accurate reading of the pressure signal that is being sent to the implement pump. The implement discharge pressure should be equal to the load sense pressure plus the added margin pressure. Theoretically, adding the pump margin to the load sense pressure reading should yield the discharge pressure. However, machine level interactions cause inaccuracies in these readings.
- Attach a pressure gauge that can sustain pressures up to
34450 kPa (5000 psi) to the implement pump discharge pressure tap (1). If testing load sense, attach a pressure gauge that can sustain pressures up to34450 kPa (5000 psi) to the implement pump load sense pressure tap (2). The implement pump discharge pressure tap (1) is located on the right side of machine in the articulated hitch as shown in Illustration 3. The implement pump load sense pressure tap is located on the left side of machine in the articulated hitch as shown in Illustration 4.Note: The pressure will need to be released out of the system to attach the pressure gauge.
- Start the machine.
- Turn off the Ride Control for the machine.
- Increase the engine speed to high idle.
- Raise the linkage until the machine stalls out in the raised position.
- Observe the pressure reading. The implement pump discharge pressure should be
31000 ± 700 kPa (4496 ± 100 psi) . The implement pump load sense pressure should be28900 ± 700 kPa (4192 ± 100 psi) . If the discharge pressure or load sense pressure is not correct, proceed to the following section for instructions to adjust the pressures. - If the discharge pressure or load sense pressure is correct, turn off the machine, release the pressure to the hydraulics to disconnect the pressure gauge.
| |
| Illustration 3 | g03717189 |
|
Location of implement pump discharge pressure tap. Right side of machine in the articulated hitch. (1) Implement pump discharge pressure tap. | |
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| Illustration 4 | g03635398 |
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Location of implement pump load sense pressure tap. Left side of machine in the articulated hitch. (2) Implement pump load sense pressure tap. | |
Adjustments are made to the load sense relief valve located on the main implement valve. The main implement valve is located in the front loader frame. The best way to access the valve is from the right side of the machine in the hitch.
| |
| Illustration 5 | g03635636 |
|
(3) Implement load sense relief valve.
(4) Locknut. | |
- Turn off machine.
- Locate the implement load sense relief valve (3) as shown in Illustration 5.
- Loosen locknut (4) and use an internal hex wrench to adjust the pressure. Turn the adjuster screw clockwise in order to increase the pressure setting. Turn the adjuster screw counterclockwise in order to decrease the pressure setting.
- Tighten locknut (3).
- Start the machine and measure the new pressure setting with the engine at high idle.
- Repeat steps 3 through 5, as needed.
- Turn off the machine, release the pressure to the hydraulics to disconnect the pressure gauge.