Caterpillar recommends this additional maintenance for the following engine components. Consult your Cat dealer for further information.
The quantity of burned fuel that is shown with the service hours assumes a load factor of 40 percent. If the load factor is higher than 40 percent, the number of service hours for the overhaul interval will be lower. If the load factor is lower than 40 percent, the number of service hours for the overhaul interval will be higher. The quantity of consumed fuel is a better indicator for the overhaul interval than service hours.
- All Seals, Gaskets, and O-rings
- Aftertreatment SCR Catalysts - Catalysts Assembly
- Bellows Assembly
- Camshaft Bearings
- Coolant Hoses and Clamps
- Coolant Diverter Valve
- DEF Back Flow Valve
- DEF GLF Heating Element
- DEF Ground Level Fill Valve
- DEF Headers
- DEF Injector Coolant Hoses
- DEF Pressure Hose
- DEF Pump
- DEF Suction and Return Hose
- Double Wall Tubing
- Engine Mounts
- Engine Software
- Flex Pipe Clamps
- Flex Pipe Gaskets
- Fuel Pressure Regulating Valve
- Fuel Priming Pump
- Gear Train Bushings, Bearings, and Thrust Plates
- Main Bearings, Rod Bearings, and Crankshaft Thrust Plates
- Piston Rings
- Wiring Harness
Rebuild Components and/or Install Remanufactured Components
- Cylinder Heads
- Turbochargers
- Oil Cooler Cores
- Oil Pump
- Scavenge Oil Pump
- Water Pumps
- Starter(s)
- Refrigerant Compressor
- Injectors
- Air Compressor (If Equipped)
Clean Components and Inspect Components for Reusability
- Aftercooler
- All Covers, Brackets, Latches, Seals, Clips
- Camshaft
- Camshaft Lifters
- Clean Emissions Module (CEM) Housing - Structural
- Connecting Rods
- Crankshaft
- Cylinder Block
- Cylinder Liners
- Damper
- Electrical Harnesses and Cables
- Fill/Vent Hoses and Clamps
- Gear Train
- Pump Electronics Tank Unit (PETU) Housing - Structural
- Piston Crowns and Piston Skirts
- Piston Pins
- Spacer Plates
- Tube Assembly
The following table correlates approximate engine hours based on load factor and target fuel burn number.
| Engine Overhaul | ||||
|---|---|---|---|---|
| Load Factor | <28% | 28%-32% | 33%-37% | >37% |
| Hours | 24,000 | 20,000 | 18,000 | 16,000 |
| Gallons | 1,125,000 | 1,125,000 | 1,125,000 | |
Note: Below a 28% Load Factor, engine operating hours will become the limiting factor.
Severe operation may reduce the hours to overhaul per chart above.
Severe operation can accelerate component wear. Engines that are operating under severe conditions may need more frequent maintenance intervals for the following reasons:
- Maximum reliability
- Retention of full service life
Because of individual applications, it is not possible to identify all the factors which can contribute to severe operation. Consult your Cat dealer about the maintenance that is needed for your specific engine.
The following factors can contribute to severe operation: environment, improper operating procedures, and improper maintenance practices.
High altitude operation may increase the soot level in the engine oil. Increased levels of soot can cause oil deterioration, deposit formation, and abnormal wear. More frequent oil drains and premium performance lubricants can offset these negative factors.
Note: Refer to Special InstructionREHS3797 for more information.
Extended operation in environments that are extremely cold or hot can damage components. Valve components can be damaged by carbon buildup if the engine is frequently started and stopped in very cold temperatures. Extremely hot inlet air reduces the performance capabilities of the engine.
Note: Refer to Special Publication, SEBU5898, "Cold-Weather Recommendations" for more information.
Unless the equipment is cleaned regularly, extended operation in a dirty environment and in a dusty environment can damage components. Built up mud, dirt, and dust can encase components. This can make maintenance difficult. The buildup can contain corrosive chemicals. Corrosive chemicals and salt can damage some components.
- Extended operation at low idle
- Minimum cool down periods after high load factor operation
- Operating the engine beyond the guidelines for the engine rating
- Operating the engine at loads that are greater than the rated load
- Operating the engine at speeds that are greater than the rated speed
- Use of the engine for an application that is not approved
Improper Maintenance Practices
- Extension of maintenance intervals
- Not using recommended fuel, lubricants, and coolant/antifreeze