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SEAL-U-CUP 4415663 - Caterpillar

4415663 SEAL-U-CUP Caterpillar parts SEAL
Alternative (cross code) number:
Caterpillar 4415663 SEAL-U-CUP
Weight: 0.25 pounds 0 kg.

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Release the hydraulic system pressure.ReferenceRefer to your host machine service literature, Disassembly and Assembly, "Hydraulic System Pressure - Release" or Test and Adjust, "Hydraulic System Pressure - Release" for the correct procedure for releasing system pressure.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, 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 to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations.
Disconnect auxiliary hydraulic connecting lines from the cylinder.
Test and adjust the maximum flows and pressures of the auxiliary hydraulic system, as needed. Refer to Table 5 at the end of this instruction.Note: If the pressure and flows are not tested at this time it will be necessary to repeat the purging of air from the system.Final Assembly
Illustration 32 g01777315
Right Side View
The linkage can move and form a pinch point which can cause personal injury. Keep hands away from the linkage.
Remove the thumb cylinder from the mounting bracket.Note: Support the thumb idler links in order to prevent the links from falling.
Use a suitable lifting device in order to remove the thumb cylinder from the thumb. Refer to Table 4 for the weight of the cylinder.
Illustration 33 g01777317
Right Side View
Use a suitable lifting device in order to raise the thumb linkage off the stick.
Illustration 34 g01797783
View of Welded Bracket
Weld the bracket using a 12 mm (0.47 inch) fillet weld as shown. Do not weld across the stick.
Allow the welded area to cool. Prepare the welded area for the application of paint.
Apply a coat of rust prevention and a finish coat to the work area that has been completed. Use Caterpillar authorized paint.
Install the thumb cylinder by following the procedures listed above.
Connect the auxiliary hydraulic lines to the cylinder.
Tighten all fasteners to the proper torque specification.
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.
Start the engine of the host machine. Cycle the hydraulic controls and check for leaks.Requirements for the Thumb Circuit
The Caterpillar thumb is hydraulically operated through a three-position control valve. The center position blocks the cylinder ports. This maintains clamping force when the control valve is not actuated. Both working ports must be protected by a relief valve and a make-up check valve. This prevents damage to the thumb cylinder from excessive pressure.The relief valves must be set at the provided flow and pressure settings, or at least a lesser value. Refer to Table 5 for the specified settings. This will allow the auxiliary hydraulic circuit to be over powered by the bucket circuit. The

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