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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. |
| 950M/962M Steering Pump Pressure | ||
|---|---|---|
| Date | Equipment ID Code | |
| Pump Pressure | Setting | Actual |
| High Pressure Cutoff (High Idle) | |
|
| 950M/962M Torque Specifications | |
|---|---|
| Callout | Torque |
| Locknut (7) High Pressure cutoff | |
This information includes the following test:
- High Pressure Cutoff
This information includes the following adjustment procedure:
- Adjustment Procedure (High Pressure cutoff)
| |
| Illustration 1 | g03131836 |
|
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.
- Engage the parking brake. Move the transmission direction selector to the NEUTRAL position.
- Operator present in seat.
- The left armrest must be down.
| |
| Illustration 2 | g03131616 |
|
Steering Frame Lock in the LOCKED Position | |
- 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 in the hydraulic service center. - Start the engine. Operate the engine at high idle. Move the tilt control lever to the TILT BACK position 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.
Note: During the following step, do not keep the steering pump at stall condition for more than 10 seconds. If necessary, release the STIC steering control lever and wait for 30 seconds before you repeat the step.
- Move the STIC steering control lever to the right to command full articulation. Continue to move the STIC steering control lever in the full articulation position in order to obtain a reliable pressure reading.
- Record the pressure reading on the pressure gauge. The reading should be
23400 ± 700 kPa (3395 ± 102 psi) . - Lower the work tool to the ground. Stop the engine.
- Relieve the hydraulic pressure.
Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the steering system, refer to the Service Manual module for Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being tested.
- If the pressure reading is correct, remove the hose assembly and the pressure gauge from pressure tap (2).
| |
| Illustration 3 | g03131636 |
| (1) Location of the remote pressure taps (hydraulic service center). Right side of machine. | |
| |
| Illustration 4 | g03719442 |
| (2) Pressure tap for the steering pump pressure | |
Adjustment Procedure (High Pressure Cutoff)
| |
| Illustration 5 | g03719464 |
|
Right side view of machine. Parts removed for clarity. (3) Pressure and flow compensator valve (4) Adjustment screw for the pressure compensator | |
| |
| Illustration 6 | 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), hold adjustment screw in place and tighten locknut (7) to a torque of
17 ± 3 N·m (150 ± 26 lb in) . - Repeat Steps 1 through 2 until you obtain the correct pressure.
- Replace the cover on adjustment screw (4).
- Lower the work tool to the ground. Stop the engine.
- Relieve the hydraulic pressure.
Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the steering system, refer to the Service Manual module for Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being tested.
- Remove the hose assembly and the pressure gauge from pressure tap (2).