ARM AS- 20R2159 - Caterpillar

Rework Procedure
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, do the procedure that follows before testing and adjusting the automatic lubrication system.
Move the machine to a smooth horizontal location. Move away from operating machines and move away from all personnel. Place blocks in front of the wheels and behind the wheels.
Put the transmission direction and speed control in the NEUTRAL position. Activate the parking brake. Stop the engine.
Remove the bucket. Remove the bearing in the bore of the B-pin if the machine has already been converted to a greased B-pin.
Illustration 1 g01076736
Arm assemblyRight side view
Remove existing 8X-0712 Plates (4) that are located in the saw cut.
Illustration 2 g01076550
All dimensions in millimeters
Install the new spacer plates. Use the dimensions in Illustration 2 as a reference when you fabricate the new spacer plates. You may grind the thickness of the plate as needed.
Install eight 6V-8198 Bolts (1), eight 6V-8237 Washes (2), and eight 7X-0851 Nuts (3). Torque the bolts to 800 100 N m (590 75 lb ft).
Illustration 3 g01076730
Top view
Create a 90° V-groove with an air carbon arc at the saw cut. Create the groove inside the bore and around the outside of the bore. If an air carbon arc is not available, use a similar tool. The groove should be to the edge of the spacer plate that was added in Step 5. The spacer plate has a depth of 20 mm (0.787 inch) except across the front of boss (5). At this location, the depth is only 15 mm (0.591 inch). Grind the surface of the V-groove in order to clean the groove.
Preheat the area to a minimum temperature of 177 °C (350 °F). The minimum interpass temperature is 177 °C (350 °F).
Weld the groove with a 7018 electrode. Use a similar electrode if a 7018 electrode is not available.
Grind the weld across the faces of the boss flush with the existing faces of the boss.
Proceed with the normal rework procedure. Ensure that the alignment of the bore is maintained according to the specifications.