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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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| 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
| 950K and 962K Steering Pump Pressure | ||
|---|---|---|
| Date | Equipment ID Code | |
| Pump Pressure | Setting | Actual |
| High Pressure Cutoff (High Idle) | 20700 ± 700 kPa (3002 ± 102 psi) |
|
 | |
| Illustration 1 | g02696116 |
| 950K and 962K Torque Specifications | |
|---|---|
| Callout | Torque |
| Locknut (7) High Pressure Cut-off | 17 ± 3 N·m (150 ± 27 lb in) |
Introduction
This information includes the following test:
- High Pressure Cutoff
This information includes the following adjustment procedure:
- Adjustment Procedure (High Pressure Cut-off)
Required Tools
 | |
| Illustration 2 | g02571852 |
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 . |
Test Preparation
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.
 | |
| Illustration 3 | g02699498 |
- Engage the parking brake. Move the transmission direction selector to the NEUTRAL position.
Test Procedure
- Attach a 0 to 25000 kPa (0 to 3600 psi) pressure gauge to pressure tap (2). Pressure tap (2) is located on the right side of the machine.
 | |
| Illustration 4 | g02694580 |
(1) Location of the remote pressure taps | |
 | |
| Illustration 5 | g02694616 |
(2) Pressure tap for the steering pump pressure | |
- Start the engine. Operate the engine at high idle. Continuously stall the RACK BACK function while simultaneously raising the lift arms at full speed. When the lift arms are almost raised, cycle the tilt cylinder almost to the FULL DUMP position. Then move the tilt cylinders to the full RACK BACK position. Continuously stall the RACK BACK function and simultaneously lower the lift arms back to the ground level position. Without stalling the RACK BACK function, cycle the lift function to raise the lift arms fully. Then lower the lift arms in order to allow the pump to operate at low-pressure briefly and circulate oil through the system. Repeat this process in order to increase the temperature of the oil to normal operating temperature.
- After the oil has reached normal operating temperature, position the bucket and any attachments slightly off the ground. Run the engine at high idle.
- Turn the steering wheel to the FULLY TURNED position in order to obtain a reliable pressure reading.
Note: During the following step, do not keep the steering pump at stall condition for more than 10 seconds. If necessary, release the steering wheel and wait for 30 seconds before you repeat the step.
- Record the pressure reading on the pressure gauge. The reading should be 20700 ± 700 kPa (3002 ± 102 psi).
- Adjust the pressure compensator valve if the steering system pressure is not correct.
- Stop the engine. Lower the bucket and any attachment to the ground.
- Remove the hydraulic line and the pressure gauge from pressure tap (2) .
Adjustment Procedure (High Pressure Cut-off)
 | |
| Illustration 6 | g02695958 |
(3) Pressure and flow compensator valve (4) Adjustment screw for the pressure compensator | |
 | |
| Illustration 7 | g00462907 |
(3) Top view of pressure and flow compensator valve (4) Adjustment screw for the pressure compensator (5) Pressure compensator spool (6) Spring (7) Locknut | |
- Remove the cover from the adjustment screw (4). Loosen locknut (7). Turn the adjustment screw (4) clockwise in order to increase the high-pressure stall. Turn the adjustment screw (4) counterclockwise in order to decrease the high-pressure stall. One turn of the adjustment screw equals approximately 2800 kPa (406 psi).
- After you turn the adjustment screw (4), tighten locknut (7) to a torque of 17 ± 3 N·m (150 ± 27 lb in).
- Replace the cover on adjustment screw (4) .