PRECLEANER G. 7F5721 - Caterpillar

Illustration 1 g02728033
(1) A typical view of the location of the bracket assembly or the plate assemblyThe bracket assemblies and plate assemblies help prevent the truck bodies from lowering during service on the machines. The parts can be ordered through the Cat dealership.
Table 1
New Parts
Model Part Number Description Body Configuration
770, and 772 283-3395 Bracket As Flat Floor
287-8121 Plate As Dual Slope
770G and 772G 364-2840 Bracket As Flat Floor
320-7065 Bracket As Dual Slope
773D and 773E 370-7578 Bracket As Dual Slope
773F, 773G, 775F, and 775G 284-5118 Bracket As Flat Floor and Dual Slope
368-5567 Bracket As Coal Body
777D, 777E, 777F, and 777G 321-5364 Plate As Coal Body
327-0411 Plate As X-Body
377-6265 Bracket As Dual Slope Refer to Table 1 for the new part numbers required for the machines based on the body configuration.Use the following procedure to install the new parts on the truck body of the listed machines. Refer to the above listed documents for the proper welding instructions.Mark the location of the parts before you remove the parts. Attach the new parts in the same location as the former parts. You will need to preheat the area to a temperature of 125° C (250° F). Use E7018 welding electrodes to weld the parts to the truck body. Use the following procedure to weld the new parts to the truck body.
Clean the area to be welded of oil, grease, paint, and dirt.Note: Protect all machined surfaces from sparks or spatter that will be produced by the welding, chipping, and grinding.
Attach the weld ground directly to the truck body as close to the weld area as possible.
Weld the new parts in place by use of weld passes that do not exceed two times the electrode diameter. Slag each pass to avoid the possibility of slag inclusions. The completed welds should be a 10 mm (0.4 inch) fillet weld with 1.5 mm (0.06 inch) penetration.
Clean and inspect the weld. The weld should be free from cracks, porosity, undercuts, and incomplete fusion. Weld a minimum of a 5 mm (0.2 inch) radius weld around the toe of the existing weld.
Use a small grinder to blend the toe of the radius weld to create a smooth transition from the weld to the rail.
Paint the repaired area.