MECHANISM GP 3343751 - Caterpillar

Part Description
Table 2
Base Metal Ductile Iron
Hardness - Flame Spray Equipment and Procedure
Table 3
Maximum Surface Finish 2.5 to 3.6 Micrometer (100 to 140 Microinches)
Reason for Spraying Wear from load applied to ring gear
Mating Part Contact Area & Material Ring gear
Oerlikon Metco Equipment Type 6P-II
Oerlikon Metco Material 452 or 453
Finished Thickness As Required
Finishing Allowance 0.51 to 0.64 mm (0.020 to 0.025 inch) per side
Spray Angle 70° to 90°
Substrate Pre-Heat Temperature 66° C (150° F)
Substrate Temperature During Spraying Not to Exceed 148° C (300° F)
Auxiliary Cooling If desired
Rotation/Traverse Device Lathe or turntable
Rotation/Traverse Speed 10.5 SMPM (300.00 SFPM)
Surface Preparation Method Undercut and Grit Blast
Finishing Method Machine
Machining Equipment Type Lathe
Recommended Cutter Grade 883 Carboloy, or equivalent
Table 4
Flame Spray Process (6P) Procedure Check List
Clean Part Degrease in hot caustic solution
Undercut To "tru-up" surface
Chamfer 45°
Remove Oxide Clean/strip disc or fiber flap brush
Mask for Blast Use metal mask or duct tape
Blast Equipment Pressure
Grit Type and Size 25/40 steel angular grit
Blast Air Pressure 620 kPa (90.0 psi)
Blast Nozzle to Work Distance 50 mm (2.0 inch)
Mask for Spray Anti-bond
Spray Equipment Type 6P-II
Auxiliary Cooling If desired
Nozzle 6P-C7A-K "K" Nozzle
Air Capacity/Pressure 6P-3/Cooling Air 140 to 170 kPa (20.0 to 25.0 psi)
Oxygen Pressure 210 kPa (30.0 psi)
Oxygen Flow 1190 L/h (42.0 cfh)
Fuel Gas Pressure 100 kPa (15.0 psi)
Fuel Gas Flow 1415 L/h (50.0 cfh)
Carrier Gas Pressure 380 kPa (55.0 psi)
Carrier Gas Flow 1050 L/h (37.0 cfh)
Spray Rate/Build Up 5.5 kg (12 lb) per hour or 90 gr (3.2 oz) per min
Gun to Work Distance 230 mm (9.0 inch)
Rotation Speed of Part (RPM) 50 to 100 RPM (dependent upon diameter)
Rotation Speed of Part 10.5 SMPM (300.00 SFPM)
Traverse Rate of Gun 1.7 SMPM (50.000 SFPM)
Gun Fixturing Method Machine mount
Top Coat/Thickness 0.10 to 0.15 mm (0.004 to 0.006 inch) per pass
Finishing Equipment Lathe
Part/Cutter Rotation 5.2 to 6.3 SMPM (150.00 to 180.00 SFPM)
Traverse Speed 0.05 to 0.10 mm (0.002 to 0.004 inch) per revolution
Depth of Rough Cut 0.38 to 0.51 mm (0.015 to 0.020 inch) per side
Depth of Finish Cut 0.25 to 0.38 mm (0.010 to 0.015 inch) per side
Additional Finish Method Emery polish Specifications
For dimensional specifications refer to Special Instruction, SEBF8119, "Differential Housing Components for Wheel Loaders, Articulated Trucks, Wheel Tractors, Compactors, and Integrated Toolcarriers" and Special Instruction, SEBF8227, "Salvage of Differential Housing Assembly Used on Off-Highway Trucks".
Illustration 3 g03072956