BOLT 0817571 - Caterpillar

Never remove the fill/vent plug from the hydraulic tank if the oil is hot.Air can enter the system and cause pump damage.
Release the pressure in the hydraulic system. Refer to Disassembly and Assembly, "Machine Preparation for Disassembly and Assembly".
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: Install caps and plugs on all openings in order to prevent dirt or debris from entering the system. Cleanliness is an important factor. Before the removal procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal components.Note: For easier assembly, mark all hose assemblies, tube assemblies, wire harnesses and cables for identification purposes.
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Disconnect hose assemblies (1) and (2) from the ripper mounting group.
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Remove bolts (3) and lock (4) from link assembly (5) .
Remove pin (6) from the rod end of cylinder (7) and link assembly (5) .
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Remove bolts (9) and locknuts (10) from bearings (8) and (11) .
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Use caution when removing the bearings. The cylinder will come free as one of the bearings is removed.
Position a suitable lifting sling around cylinder (7). Secure the lifting sling to a hoist. Use forcing bolts in order to remove bearings (8) and (11) from carriage assembly (12) .
Remove cylinder (7) from carriage assembly (12). The weight of cylinder (7) is 27 kg (60 lb).Installation Procedure
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Position a suitable lifting sling around cylinder (7). Secure the lifting sling to a hoist. The weight of cylinder (7) is 27 kg (60 lb). Position the ripper lift cylinder to carriage assembly (12) .Note: The fittings for the hydraulic hose assembly must face upward.
Install bearing (8), bearing (11), carriage assembly (12), and cylinder (7) .
Install bolts (9) and locknuts (10) that hold bearings (8) and (11). Tighten bolts (9) to a torque of 135 20 N m (99 15 lb ft).
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Position the rod end of cylinder (7) into link assembly (5). Align the pin retention holes.
Install pin (6) into the rod end of cylinder (7) and link assembly (5). Keep the lock retention slot in pin (6) aligned in order to match lock (4) .
Install lock (4) and bolts (3) to link assembly (5). Tighten bolts (3) to a torque of 135 20 N m (99 15 lb ft).
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Install hose assemblies (1) and (2) to the original locations on the mounting fittings.