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Sudden movement of the tilt cylinders and/or rotator is possible if the tilt and rotate functions are not disconnected. Sudden movement of the tilt cylinders and/or rotator could result in serious injury or death. When checking and/or adjusting any of the harvester head pressures, the tilt circuit solenoids must be disconnected. If equipped, the rotate circuit solenoids must also be disconnected. |
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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
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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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Dry nitrogen is the only gas approved for use in the accumulator. Charging the accumulator with oxygen gas will cause an explosion. This danger will not happen if nitrogen cylinders with standard CGA (Compressed Gas Association, Inc.) Number 580 connections are used. When you order nitrogen gas, be sure that the cylinders are equipped with CGA No. 580 Connections. Do not use color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. |
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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. |
The accumulator is connected to the feed roller arm cylinder CLOSE circuit. When the feed roller arms close, oil flows to the accumulator from the feed roller arm control valve. The accumulator is use to absorb pressure spikes when the rollers move over tree knots.
The following procedure is used to check the nitrogen charge pressure in the accumulator.
| Required Tools | ||
| Part | Description | Quantity |
| 175-5507 | Nitrogen Charging Group | 1 |
| 198-4240 | Digital Pressure Indicator Gp | 1 |
| 177-7861 | Hose As | 1 |
- Prepare the machine for test and adjust procedures. Refer to Testing and Adjusting, "Preparation for Troubleshooting".
- Start the engine. Lower the hydraulic activation control lever. Raise the harvester head approximately 0.3 m (1 ft) above the ground.
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| Illustration 1 | g02549477 |
The harvester head in the HORIZONTAL position. | |
- Shut off the engine.
- Attach a 0 to 16000 kPa (0 to 2300 psi) pressure gauge to the test port of accumulator (1). The accumulator is located under the lower rear cover of the head.
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| Illustration 2 | g02428257 |
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| Illustration 3 | g02435716 |
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| Illustration 4 | g02407257 |
- The nitrogen charge pressure should read 6200 kPa (900 psi). If the gauge does not read 6200 kPa (900 psi), recharge the accumulator to this value.