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Personal injury or death can result from machine articulation or movement. Machine frames can move and a person can be crushed. Connect the steering frame lock link between the front and rear frames before working on machine. |
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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. |
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The drive shaft rotates between the torque converter and the transmission whenever the engine is running. Contact with the rotating shaft can result in personal injury or death. The rotating shaft is located under the implement and steering pumps. Do not allow personnel into the pump bay area behind the cab when the engine is running. |
| 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. |
| 950M/ 962M Steering Pilot Pressure | ||
|---|---|---|
| Date | Equipment ID Code | |
| Pump Pressure | Setting | Actual |
| Steering Pilot System Pressure | |
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This information includes the following test:
- Steering Pilot System Pressure
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| Illustration 1 | g02571852 |
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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)) |
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| A2 | 1 | 198-4238(1) | Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi)) |
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| A2 | 1 | 198-4239 | Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi)) |
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| A2 | 1 | 251-9600(2) | Pressure Sensor Gp
(0 to 68,900 kPa (0 to 10,000 psi)) |
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| 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. |
Reference: For more information about preparing the machine for troubleshooting, refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
Reference: Refer to the Service Manual module Testing and Adjusting, "System Pressure - Release".
- Park the machine on a smooth, level surface. Move the machine away from other operating machines and away from personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in sight of the operator.
- Position the work tool on the ground.
- Engage the parking brake.
Show/hide table
Illustration 2 g03137299 - Place the steering frame lock in the LOCKED position.
- Release the hydraulic pressure.
- Ensure that the engine start switch is in the OFF position. Install a 8T-0850 Pressure Gauge from 1U-5481 Pressure Gauge Group or a 198-4240 Digital Pressure Indicator to pressure tap (1).
- Ensure that the engine start switch is in the OFF position. Install a 8T-0850 Pressure Gauge from 1U-5481 Pressure Gauge Group or a 198-4240 Digital Pressure Indicator to pressure tap (1a).
- Start the engine and warm the hydraulic oil to a normal operating temperature of approximately
54 to 70°C (129 to 158°F) . - Run the engine at low idle and the fan control at minimum fan speed.
- Observe the pressure gauge from both gages.
- The pressure reading should be at least
3650 ± 350 kPa (530 ± 50 psi) . - If the pressure is correct, turn the engine start switch to the OFF position.
- Release the hydraulic pressure. Refer to the Service Manual module Testing and Adjusting, "System Pressure - Release".
- Remove the test equipment from the machine.
- If the pilot oil pressure is not correct, turn the engine start switch to the OFF position.
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| Illustration 3 | g02198436 |
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Location of hydraulic service center | |
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| Illustration 4 | g03581821 |
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Location of steering pilot supply pressure tap in the bottom of the hydraulic service center (A) (Right side view) (1) Primary steering pilot supply pressure tap | |
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| Illustration 5 | g03581824 |
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Location of implement/redundant steering pilot supply pressure tap is on the front differential lock valve. The front differential lock is located on the left side of the front frame. (1a) Implement/redundant steering pilot supply pressure tap | |
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| Illustration 6 | g03137301 |
In order to adjust the pressure reducing valve, refer to the instructions below on adjusting the pressure reducing valve.
Adjusting the Pressure Reducing Valve for the Steering Pilot Supply.
- Locate the pressure reducing valve for the primary steering pilot supply. The pressure reducing valve is located on the control manifold in the hydraulic service center.
- Before adjusting the pressure reducing valve (2), release the hydraulic system pressure. Refer to Testing and Adjusting, "System Pressure - Release".
- Ensure that the work tool is on the ground. Turn the engine start switch to the OFF position.
Note: Always, turn adjustment screw clockwise in order to adjust the pressure. Turning clockwise will compensate for any internal friction inside the valve that would oppose the setting of the bias spring. For example, if the adjustment screw needs a 1/2 turn counterclockwise to decrease the pressure, turn the adjustment screw counterclockwise by one full turn. Then, turn the adjustment screw clockwise by 1/2 turn
- Loosen the locknut on the pressure reducing valve. Turn the adjustment screw clockwise in order to increase the pressure setting. Turn the adjustment screw counterclockwise in order to decrease the pressure setting of the pressure reducing valve.
- After the adjustment screw is turned for an adjustment, hold the adjustment screw in place and tighten the locknut.
- Repeat the pressure test Steps 4 through 7.
- If pressure setting is not correct, repeat Steps 4 and 5.
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| Illustration 7 | g03137744 |
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Control manifold located in hydraulic service center. Side removed for clarity. (2) Pressure reducing valve for the primary steering pilot supply | |