Usage:
HH55 (3MZ),
HH65 (4RZ),
HH75 (5WZ) Harvester Heads
Description of Change: A new stump treatment hose assembly is being used in order to prevent interference with the cutting blade.
Effective With: The new 178-0379 Hose Assembly, 178-3070 Fitting, and 178-3794 Copper Washers replaces the 162-6033 Hose (canceled) and the 157-3287 Fitting (not canceled). The new hose assembly, fitting, and copper washers are effective with HH55 (3MZ219-Up), HH65 (4RZ268-Up), and HH75 (5WZ237-Up) Harvester Heads. All previous production is adaptable to the new assembly.
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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.
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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Care must be taken to ensure that fluids are contained during performance of inspection, testing, adjusting, and repair of the machine. 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 in Caterpillar machines.
Dispose of all fluids according to local regulations and mandates.
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Modification Procedure:
1. Permit only one operator on the machine. Keep other personnel away from the machine and harvester head.
2. Park the machine on a smooth, level surface. Move away from other operating machines and away from personnel. Tilt the harvester head into the HORIZONTAL position. Lower the head to the ground.
3. Engage the parking brake. Place blocks in front of the wheels or tracks. Place blocks behind the wheels or tracks.
4. Install the steering frame lock so that the machine cannot articulate. Install the cab lock pin.
5. Turn the attachment switch to the OFF position. Stop the engine by turning the engine start switch key to the OFF position.
6. Remove the 157-1742 Saw Blade.
Former Stump Treatment Hose Assembly
7. Remove the 162-6033 Hose (1) and 157-3287 Fitting (2).
New Stump Treatment Hose Assembly
8. Install the 178-0379 Hose Assembly (3). Install a 178-3794 Copper Washer (5) on each side of the implement end of the 178-0379 Hose Assembly.