PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING TWO 244-8593 GEARS IN THE FRONT GEAR ASSEMBLY ON CERTAIN C175 REMAN ENGINES IN DEALER PARTS STOCK Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING TWO 244-8593 GEARS IN THE FRONT GEAR ASSEMBLY ON CERTAIN C175 REMAN ENGINES IN DEALER PARTS STOCK

Usage:

TEBE4840-00

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24Jun2016

U-331

A-251

D-293

O-289

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Parts stock action only	PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING TWO 244-8593 GEARS IN THE FRONT GEAR ASSEMBLY ON CERTAIN C175 REMAN ENGINES IN DEALER PARTS STOCK
7750		PI70632

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NOTE:	Caterpillar’s obligations under this Service Letter are subject to, and shall not apply in contravention of, the laws, rules, regulations, directives, ordinances, orders, or statutes of the United States, or of any other applicable jurisdiction, without recourse or liability with respect to Caterpillar.
NOTE:	When submitting claim for Parts Stock Action, Use the appropriate 99Z as the s/n, the appropriate Service Letter Program Number as the Part number in the Part Causing Failure field, "7751" as the Group Number, "56" as the Description Code.

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NOTE:

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

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TERMINATION DATE

30Sep2016

PROBLEM

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Two 244-8593 gears in Reman C175 engines may have been installed incorrectly (backwards) at the factory. If these gears are run in service, they may have increased wear and reduced life.

ACTION REQUIRED

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Inspect and possibly rework the following C175 Reman engines in dealer parts stock:
20R1362
20R1363
20R1492
20R4666
20R4667
20R4668

For Reman C175 engines in dealer stock, perform the following steps.

Inspect:
Use a boroscope to inspect for incorrectly installed gears.

On the right-hand side (high pressure fuel pump side), check the gap between the 244-8593 and 255-4445 gears, which should be approximately 3mm per Image 1. If incorrectly installed, the gap will be significantly smaller than 3mm (or non-existent).

On the left-hand side (oil pump side), inspect the 244-8593 gear (lower gear in Image 2). If a ~3mm offset is present per Image 2, the gear was installed backwards.

Rework gear on right-hand side:
If the gap was found to be incorrect during inspection, remove the high pressure fuel pump, remove the high pressure fuel pump adapter and lines, remove gears, clean parts, and flip gear 244-8593 180? (it was installed backwards). Reassemble. Tighten the bolts that hold the gear to the shaft to 55+/-10 Nm.

Rework gear on the left-hand side:
If a ~3mm offset was found between the gears during inspection, remove the oil pump, remove gears, separate, clean parts, and flip gear 244-8593 180? (it was installed backwards). Reassemble.

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Image1

Image2

SERVICE CLAIM ALLOWANCES

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Submit a claim for the engines reworked in dealer parts stock and/or dealer exchange inventory. Parts: When reworking gears found to be installed incorrectly, this Service Letter allows one new 165-4852 o-ring seal per gear reworked. Labor: 1 hour will be allowed for inspection of both gears. If an incorrectly installed 244-8593 gear is found on the right-hand side (high pressure fuel pump side side), 20 hours will be allowed for rework. One or both gears may be incorrectly installed. If an incorrectly installed 244-8593 gear is found on the left-hand side (oil pump side), 10 hours will be allowed for rework. One or both gears may be incorrectly installed. Include engine serial number, arrangement number, and work required in the service claim story for each Reman C175 engine inspected and/or repaired.