Preparation
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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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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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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the bucket and/or attachments to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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The harvester head frame may tip when it is in the vertical position. Personal injury or death may result if this occurs. Secure the frame to the yoke with a chain or similar restraint prior to working on the harvester head. |
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| Illustration 1 | g00725561 |
| 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. |
Note: These steps must be performed prior to working on the harvester head.
Perform the following steps when the harvester head is attached to a harvester or to an excavator.
- Permit only one operator on the machine. Keep other personnel away from the harvester head.
- Move away from other operating machines and away from personnel. Park the machine on a smooth, level surface. Position the harvester head frame in the HORIZONTAL or VERTICAL position. Lower the harvester head to the ground. If the harvester head frame is in the VERTICAL position, secure the frame to the yoke before proceeding.
- If the machine has a parking brake, engage the parking brake. Place blocks in front of the wheels or tracks. Place blocks behind the wheels or tracks.
- Support the harvester head when the harvester head is raised for testing or for adjusting. The boom circuit and the stick circuit have high oil pressure when the harvester head is off the ground.
- Stop the engine by turning the engine start switch key to the OFF position. Turn the battery disconnect switch to the OFF position.
- If the machine has steering cylinders, install the steering frame locks so that the machine can not articulate. If the machine has a lock pin that will prevent rotation of the cab, install the lock pin.
- If the harvester head is mounted on an excavator, move the control levers through the full range of travel in order to relieve line pressure.
- In order to relieve all of the pressure in the hydraulic oil tank, slowly loosen the filler cap.
- Attach a wrench to stud (1) for manual movement of the valve spool. Slowly turn the wrench until the wrench is fully down. Slowly turn the wrench until the wrench is fully up.
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| Illustration 2 | g00451931 |
- Repeat step 1 for each stud on the hydraulic control valve. The HH45 Harvester Head, HH55 Harvester Head, and HH65 Harvester Head have seven studs. The HH75 Harvester Head has eight studs.
- Make sure that all oil pressure is released before you begin any work on the harvester head.
Perform the following steps if the harvester head is attached to a test stand or to a similar device.
- Attach a wrench to stud (1) for manual movement of the valve spool. Slowly turn the wrench until the wrench is fully down. Slowly turn the wrench until the wrench is fully up.
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| Illustration 3 | g00451931 |
- Repeat step 1 for each stud on the hydraulic control valve. The HH45 Harvester Head, HH55 Harvester Head, and HH65 Harvester Head have seven studs. The HH75 Harvester Head has eight studs.
- Make sure that all oil pressure is released before you begin any work on the harvester head.