450 LXi
Owner Manual
5-3 Engine Maintenance
Rev. “C”
~ 5-3-41 ~
5-3.45 Severe Service Application - Check
Operation and maintenance practices affect the service life of the components when the engine is operated in severe service
applications.
The level of maintenance is crucial to the service life of the engine. Other major factors that affect service life are operating
speed and loads.
The conditions that follow can indicate severe service operations:
Operation above 36,320 kg (80,000 lb) gross vehicle weight (GVW) and other high load factor operations (such as
off-highway)
Frequent high altitude operation above 1525 m (5000 ft)
Extended operation at low idle
Arctic operation (regular cold starts at temperatures below -18°C (0°F))
Extending maintenance beyond the recommended maintenance intervals
Frequent hot shutdowns (minimum fi ve minute cool down periods after high load factor operation)
Use of fuels that are NOT recommended by Caterpillar in the Fuel Specifi cations
Extreme ambient temperature conditions that may cause the lubricating properties of the fuel to diminish
Frequent plugging of the fuel fi lter
Extended maintenance intervals of the fuel system
Inadequate maintenance of fuel storage tanks (excessive water, sediment, microorganism growth, etc.)
5-3.46 Turbocharger - Inspect
Periodic inspection and cleaning is recommended for the turbocharger compressor housing (inlet side)
If the turbocharger fails during engine operation, damage to the turbocharger compressor wheel and/or to the engine may
occur. Damage to the turbocharger compressor wheel can cause additional damage to the pistons, the valves, and the
cylinder head.
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A periodic inspection of the turbocharger can minimize unscheduled downtime and the chance for potential damage to other
engine parts.
5-3.46.1 Removal and Installation
For options regarding the inspection, removal, installation, repair and replacement, consult your authorized Caterpillar
service center.
NOTICE:
Turbocharger bearing failures can cause large quantities of oil to enter the air inlet and exhaust
systems. Loss of engine lubricant can result in serious engine damage.
Minor leakage of a turbocharger housing under extended low idle operation should not cause problems as long as a
turbocharger bearing failure has not occurred.
When a turbocharger bearing failure is accompanied by a signifi cant engine performance loss (exhaust smoke or
engine rpm up at no load), do not continue engine operation until the turbocharger is repaired or replaced.
NOTE:
Turbocharger components require precision clearances with proper balancing in order to support
high operating speeds. Severe Service Applications can accelerate component wear. Therefore, more frequent
inspections of the cartridge are required.
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