BUSHING 1944017 - Caterpillar

Illustration 8 g02334817
Position frame assembly (4) underneath the boom of the excavator by using a suitable lifting device. The approximate weight of frame assembly (4) is 198 kg (436.51 lb). Install pin assembly (7) through frame assembly (4) and the rod end of cylinder (3). Secure pin assembly (7) using bolt (13) and washer (11) .
Install pin assembly (7) through frame assembly (4) and bracket assembly (5). Secure pin assembly (7) using bolt (13) and washer (11) .
Connect the auxiliary hydraulic lines to the cylinder.
Do not allow the cylinder to contact the thumb frame or any part of the stick. Failure to prevent contact will result in damage to the cylinder, thumb frame, and stick.
Slowly open and close the thumb four times to purge air from the system. Do not apply pressure to the thumb at this time. Ensure that the cylinder barrel does not contact the stick or any part of the thumb.
Make final adjustments to bracket (5) and bracket (6) in order to meet the conditions described below.
Cylinder (3) must not come in contact with the boom when the stick is fully curled.
Cylinder (3) must not come in contact with the stick during operation of the thumb.
The hydraulic cylinder (3) must maintain approximately 6 mm (0.24 inch) of remaining stroke when the thumb is fully opened in order to prevent damage to the hydraulic cylinder.
All pin assemblies must not bind during the complete range of motion of the thumb.
Either remove the hydraulic cylinder from the stick or take measures in order to protect the hydraulic cylinder from weld spatter.
Weld brackets (5) and (6) in place. Refer to Illustration 1.Note: Do not weld completely 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.
Tighten all fasteners to the proper torque specification. Verify that all of the pins are secured.
Verify that all grease fittings (1) have been installed. Apply grease to all fittings and pins.
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.Setting Flows and Pressures
Check valves in the hydraulic system may allow pressure to exist in the hydraulic lines after the engine has been stopped. Pressure must be relieved prior to servicing the components of the hydraulic system. Failure to relieve pressure prior to servicing may result in personal injury.
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