PRODUCT SUPPORT PROGRAM FOR REPLACING AND IMPROVING THE AUTOMATIC ENGINE SPEED CONTROL SWITCH CIRCUIT ON CERTAIN M313C, M315C, M316C, M318C, M322C, AND M322C MH WHEELED EXCAVATORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING AND IMPROVING THE AUTOMATIC ENGINE SPEED CONTROL SWITCH CIRCUIT ON CERTAIN M313C, M315C, M316C, M318C, M322C, AND M322C MH WHEELED EXCAVATORS [REBE4307]

HYDRAULIC SYSTEM

LINES GP-HYDRAULIC

PRODUCT SUPPORT PROGRAM FOR REPLACING AND IMPROVING THE AUTOMATIC ENGINE SPEED CONTROL SWITCH CIRCUIT ON CERTAIN M313C, M315C, M316C, M318C, M322C, AND M322C MH WHEELED EXCAVATORS

REBE4307-00

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30Oct2008

U-549

A-454

D-466

O-503

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*After Failure Only*	PRODUCT SUPPORT PROGRAM FOR REPLACING AND IMPROVING THE AUTOMATIC ENGINE SPEED CONTROL SWITCH CIRCUIT ON CERTAIN M313C, M315C, M316C, M318C, M322C, AND M322C MH WHEELED EXCAVATORS
1915 5059 5057		PS51579

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NOTE:

This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS51579" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS 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 AVSpare product analyst.

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TERMINATION DATE

31Oct2010

PROBLEM

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The existing automatic engine speed control (AEC) pilot pressure switch can fail on certain M313C, M315C, M316C, M318C, M322C, and M322C MH Wheeled Excavators. If the existing switch fails, it can result in loss of automatic engine speed control function and loss of oil.

AFFECTED PRODUCT

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Model	Identification Number
M313C	BDR02001-02223 H2A00256-00447, 449-706
M315C	BDM02001-02227 H2B00189-00552
M316C	BDX02001-02322 H2C00197-00673
M318C	BCZ02001-02246 BEB02001-02067 H2D00258-00794 H2F00128-00254
M322C	BDK02001-02096 H2E00247-00447
M322C MH	BDY02001-02082 H2G00247-00423

PARTS NEEDED

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Qty	Part Number	Description
2	3J1907	SEAL-O-RING
2	4J5477	SEAL-O-RING
1	6V9828	CAP AS
1	7X2444	TEE-SWIVEL-SPL
1	2015348	CONNECTOR
1	3095769	SWITCH AS-PRESS.
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 4% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

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Refer to the attached Rework Procedure.

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	AVSpare		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-6000 hrs, 0-48 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 3.0-hour job

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PARTS DISPOSITION

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Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Rework Procedure

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Remove the failed 167-3466 Switch Assembly, the 108-7516 Fitting, and the 3J-1907 Seal-O-Ring. Discard the switch assembly and seal-o-ring but retain the adapter fitting for reuse.

Replace the previous components with those shown in Image 1.1.1 below. Tighten the 309-5769 Switch Assembly to a torque of 12+/-2 Nm. Final installation will look similar to Image 1.1.2. However, the location and/or orientation of the components may vary when a medium pressure control valve is not present.

Image1.1.1

Image1.1.2

With the engine off, use the 6V-9828 Cap Aaaembly (labelled "A" in Image1.1.2) and the 197-7930 Bolt-Socket Head screws in the 224-2983 Valve Group-Pressure Reducing (labelled "B" in Image 1.1.2, only present if medium pressure control valve is installed) to bleed the air from the pilot pressure reducing valve and the automatic engine control pressure switch cavities.

Refer to Testing and Adjusting Manual, RENR9125, and adjust the 224-2983 Valve Group-Pressure Reducing (Pilot control pressure) to 3000 kPa and the 148-7291 Valve Group (Pilot Relief) to 3400 kPa.

After these adjustments, repeat the bleed procedure above to ensure that any remaining air is removed from the pilot pressure reducing valve and the automatic engine control switch cavities.

Switch failure is accelerated by operation at high hydraulic oil temperatures. Ensure that all coolers are clean and free of obstruction and debris.