DRIVE GP-PUMP 20R3475 - Caterpillar

Fuel Consumption Before A Top End Overhaul
The overhaul interval that is listed in this Operation and Maintenance Manual, "Maintenance Interval Schedule" is expressed in service hours. A more accurate figure to use is fuel consumption. Fuel consumption corresponds more accurately to the engine load. Table 1 lists an average range of fuel consumption for a reasonable load factor before a top end overhaul.
Table 1
Approximate Fuel Consumption Before A Top End Overhaul
Engine Model Fuel Consumption
C280-12 11370000 L (3003954 US gal) Remanufacturing or Rebuilding of Components
Rework the following components:
Air shutoff valve
Cylinder heads
Cylinder dowels
Exhaust valves
Exhaust valve seat inserts
Inlet valves
Inlet valve seat inserts
Inner valve springs
Outer valve springs
Unit injectors
Valve spring guides
Valve spring locks
Valve rotatorsNote: The angles of the valves and seats are different.If the valves and seats are not replaced, lap the valves and seats. The valve and the outer diameter of the seat must have 360 degrees of contact. If the valves and the seats require regrinding, see the Service Manual, "Specifications" module for the angles.Inspection and/or Replacement of Components
Inspect the following components according to the instructions that are in Caterpillar reusability publications. Refer to Guidelines for Reusable Parts and Salvage Operations, SEBF8029, "Index of Publications on Reusability or Salvage of Used Parts". Replace the components, if necessary.
Cylinder sleeves
Exhaust shields
Starting motor
ThermocouplesReplacement of Components
Replace the following components.
Connecting rod bearings
Cylinder head gaskets and seals
Exhaust manifold gaskets
Fuel transfer pump seals
Inlet air line seals
Oil cooler seals
Oil pump bearings and seals
Oil temperature regulators and seals
Turbocharger bearings, bushings, and seals
Valve lubricator pump (if equipped)
Water pump bearings and seals
Water temperature regulators and sealsCleaning and Inspection of Components
Clean the following components. Inspect the components for good condition. Replace the components, if necessary.
Oil cooler core
Oil suction screenOil Cooler Core
For cleaning the oil cooler core, see this Operation and Maintenance Manual, "Aftercooler Core - Clean/Test" procedure. The procedure may be used for cleaning both the aftercooler core and the oil cooler core.Oil Suction Screen
For cleaning the oil suction screen, see this Operation and Maintenance Manual, "Engine Oil - Change" procedure.