| Required Tools | ||
| Part Number | Description | Quantity |
| 198-4240 | Digital Pressure Indicator | 1 |
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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 |
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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, "Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on products. Dispose of all fluids according to local regulations and mandates. |
- Prepare the machine for troubleshooting.
Reference: Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
- Connect the 198-4240 Digital Pressure Indicator to pressure taps (2) and (4) .
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| Illustration 1 | g00864813 |
Typical Example (1) Implement pump. (2) Pressure tap (discharge pressure). (3) Load sensing valve. (4) Pressure tap (load signal pressure). | |
- Warm the hydraulic oil to normal operating temperature. Normal operating temperature is 45 °C (115 °F) to 70 °C (160 °F). Use the following procedure in order to warm the hydraulic oil.
- Operate the engine at 1800 RPM to 2000 RPM.
- Extend the lift arms until the cylinders bottom out.
- Operate the tilt cylinders back and forth until you reach the normal operating temperature.
- Lower the work tool to the ground.
- Move the hydraulic lockout control to the LOCKED position.
- Operate the engine at high idle. High idle is 2350 ± 50 RPM.
- Record the readings from pressure taps (2) and (4) .
- Measure the difference between the two pressure tap readings. The differential pressure setting should be approximately 2600 ± 150 kPa (375 ± 25 psi).
- To adjust the differential pressure setting, loosen the locknut on load sensing valve (3). Turn the adjustment screw on load sensing valve (3) until the differential pressure setting is approximately 2600 ± 150 kPa (375 ± 25 psi).
- Tighten the locknut on load sensing valve (3). Confirm the new differential pressure setting. Repeat Step 9, if necessary.
- Stop the engine. Remove the test equipment.