| Required Tools | ||
| Part Number | Description | Qty |
| 8T-0859 | Pressure Gauge | 1 |
| 4C-4892 | ORFS Fittings Group | 1 |
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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing 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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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 attachments have been lowered, 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. |
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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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 1 | g00471201 |
Leveling Blade Cylinder (1) Hose. (2) Cylinder rod end port. | |
- Disconnect hose (1). Install a tee at cylinder rod end port (2). Connect a 25000 kPa (3600 psi) pressure gauge to one end of the tee. Connect hose (1) to the other end of the tee. This gauge measures the pressure setting of the relief valve.
- Start the machine and run the engine at high idle at 2350 ± 50 rpm until the hydraulic oil temperature reaches 38°C (100°F).
- Pull the blade control lever back to the RAISE position. Keep the blade control lever in the RAISE position after the blade is completely raised. Read the pressure on the gauge. The pressure should be 8600 ± 345 kPa (1247 ± 50 psi).
- The relief valve (4) must be adjusted if the pressure is not correct.
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| Illustration 2 | g00471247 |
Leveling Blade Control Valve (3) Control valve. (4) Relief valve. (5) Protective nut. | |
- Remove nut (5) from relief valve (4). Loosen the locknut and turn the adjustment screw clockwise in order to increase the pressure setting. Turn the adjustment screw counterclockwise in order to decrease the pressure setting.
- Check the relief valve pressure setting again. If the pressure is correct, tighten locknut (6) and install nut (5) .
- Remove the pressure gauge and the tee. Reconnect the hose (1) to the cylinder rod end port (2) .