0303442 JOHNSON HOUSING, Impeller

Air Compressor
Rebuild or Exchange
Visually check for fluid leaks.Our recommendation to maintain your air compressor before it fails will be less costly than repairing the air compressor after failure.If the engine is operated until the air compressor fails, additional damage to the engine could result. For example: A failed air compressor could contaminate the engine oil with particles of materials since engine oil also lubricates the air compressor. The circulation of these engine oil with particles of materials since engine oil also lubricates the air compressor. The circulation of these contaminates through the engine lubricating system could damage the engine's main and connecting rod bearings.Maintenance Options
Repair Kits - These useful kits can be obtained from your Caterpillar dealer. These kits include all the necessary parts, special tools and instructions to repair your air compressor in either your own maintenance shop or at your servicing dealer's facility. Repair kits simplify parts ordering, help speed repairs and reduce parts cost. Exchange - This is a cost cutting service that permits exchanging a worn air compressor for a dealer or OEM factory rebuilt air compressor on an over-the-counter basis. They are available when needed at a substantial savings in both time and money. New - Replace with a new air compressor.Caterpillar Recommendation
The most cost effective repair option is to rebuild the air compressor with a repair kit that can be obtained from your Caterpillar dealer.Refer to the Service Manual for your engine to remove and install the air compressor.Turbocharger
Rebuild or Exchange
The cost incurred to maintain your turbocharger before failure as recommended could be significantly less than if you wait until your turbocharger fails.By maintaining your turbocharger before failure, you will minimize unscheduled downtime and reduce the chances for potential damage to other engine parts. When you reduce the risk of unscheduled downtime and costly repairs, you conserve cash that can be budgeted for use more profitably elsewhere.If you choose to operate your engine until the turbocharger fails, your repair costs could be as much as twenty-five times or more compared to the repair before failure cost. This excessive cost is due to additional engine damage that could have been prevented.If the engine is operated until the turbocharger fails, severe damage to the turbocharger's compressor wheel and/or engine could result.For example: severe damage to the turbocharger compressor wheel could cause parts from the compressor wheel to enter the engine cylinder that could result in cracks in the cylinder head and cause additional damage to the piston, a piston seizure orother potential damage to valves and cylinder head.Our recommended maintenance intervals for performing preventive maintenance on your turbocharger are based on experience and gathered data relative to the expectant life of the engine and its components. These maintenance intervals were developed as a service for your use to minimize unexpected and costly repairs as well as to serve as an aid to reduce your operating costs.Failure to follow our recommendations could result in unexpected, costly repairs and unscheduled downtime.Caterpillar recommends that the most cost effective method for the turbocharger is to rebuild or exchange the unit before it fails.Maintenance Options
Repair KitsThese useful kits can be obtained from your Caterpillar dealer. These kits include all the necessary parts and instructions to repair the turbocharger in either the owner/operator's maintenance shop or at a servicing dealer's facility. Repair kits simplify parts ordering, help speed repairs and reduce parts costs. RemanufacturedThis process uses manufacturing techniques and procedures to restore the turbocharger to like-new performance capability. This process always involves an end product which conforms to the manufacturer's "original" functional specification NewReplace with a new turbocharger.Before deciding which method is best, make sure you have considered all of the options and costs associated with repair. Some considerations are:* The costs associated with using separate parts from inventory versus the cost of a repair kit.* Downtime costs while the product is being rebuilt or repaired.* Total parts and labor costs for repairs versus the actual Remanufactured cost.* Remanufactured components from Caterpillar are covered by a national factory warranty.Caterpillar Recommendation
To minimize downtime, Caterpillar recommends the use of a Remanufactured turbocharger.There are two levels of pricing for Remanufactured turbochargers. The first level is primarily based on damage to the turbocharger before failure. The second level is primarily based on damage to the turbocharger after failure. If you choose to operate the engine until the turbocharger fails, repair costs could be as much as ten times the repair before failure cost due to additional turbocharger and engine damage that could have been prevented.Refer to the Service Manual for your engine to remove and install the turbocharger.Engine Mounts
Inspect/Check
Front engine mounts
Rear engine mount.Caterpillar recommends checking the engine mounts for deterioration and proper bolt torque. This will prevent excessive engine vibration caused from improper mounting. See your Service Manual or OEM truck manufacturer for recommended torque values.Throttle Position Sensor
Check/Adjust Calibration
Caterpillar recommends that the Throttle Position Sensor be checked and calibrated at this time. Refer to Special Instructions SEHS8741, SEHS8743, and SEHS8746 for the procedure to mechanically and electronically check and calibrate the proper sensor type for your particular arrangement. Slow engine response and low power may indicate a need for adjustment or repair. This adjustment should not be attempted by untrained personnel. Your Caterpillar dealer is equipped with the necessary tools, personnel and procedures to perform this service.
These adjustments are to be made only by an authorized Caterpillar dealer or mechanic that has the correct training. Your Caterpillar dealer has all of the necessary equipment. Failure to follow this recommendation could result in excessive fuel consumption.