PUMP GP-GEAR 1305643 - Caterpillar

Scheduling a Major Overhaul
The need for a major overhaul is determined by several factors. Some of those factors are the same factors that determine the in-frame overhaul:
An increase of oil consumption
An increase of crankcase blow-by
A decrease and variation of cylinder compressionOther factors must be considered for determining a major overhaul:
Power output
The service hours of the engine
Reduced oil pressure
The wear metal analysis of the lube oil
An increase in the levels of noise and vibrationAn increase of wear metals in the lube oil indicates that the bearings and the surfaces that wear may need serviced. An increase in the levels of noise and vibration indicates that rotating parts require service.Note: Oil analysis can indicate a decrease of wear metals in the lube oil. The cylinder liners may be worn so that polishing of the bore occurs. Also, the increased use of lube oil will dilute the wear metals.Monitor the engine as the engine accumulates service hours. Consult your Cat dealer about scheduling a major overhaul.Note: The generator or driven equipment may also require service when the engine is overhauled. Refer to the literature that is provided by the OEM of the driven equipment.Major Overhaul Information
A major overhaul includes all the work that is done for top end overhauls and in-frame overhauls. More parts and labor are required to rebuild the engine. Sometimes, the engine is relocated for disassembly.For the major overhaul, all the bearings, seals, gaskets, and components that wear are disassembled. The parts are cleaned. The parts are inspected. If necessary, the parts are replaced. The crankshaft is measured for wear. The crankshaft may require regrinding. Alternatively, the crankshaft may be replaced with a Cat replacement part.Your Cat dealer can provide