PRODUCT SUPPORT PROGRAM FOR REPLACING THE MAIN STEERING CONTROL VALVE ON CERTAIN 834G, 834H WHEEL DOZERS AND 836G, 836H LANDFILL COMPACTORS THAT ARE EQUIPPED WITH STANDARD STEERING Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE MAIN STEERING CONTROL VALVE ON CERTAIN 834G, 834H WHEEL DOZERS AND 836G, 836H LANDFILL COMPACTORS THAT ARE EQUIPPED WITH STANDARD STEERING

Usage:

REBE3126-01

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17Dec2007

(Revised 10Sep2009)

U-662

A-539

D-542

O-580

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*After Failure Only*	PRODUCT SUPPORT PROGRAM FOR REPLACING THE MAIN STEERING CONTROL VALVE ON CERTAIN 834G, 834H WHEEL DOZERS AND 836G, 836H LANDFILL COMPACTORS THAT ARE EQUIPPED WITH STANDARD STEERING
4307		PS51420

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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 "PS51420" 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 Caterpillar product analyst.

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NOTE:	This Revised Service Letter replaces the 17Dec2007 Service Letter. Changes have been made to correct the Main Steering Control Valve part number in the Problem and Rework Procedure. The part number changed from 149-0932 to 149-0392.

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TERMINATION DATE

31Dec2009

PROBLEM

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The main steering control valve may cause hydraulic instability when the machine is articulated to the left on certain 834G, 834H Wheel Dozers and 836G, 836H Landfill Compactors that are equipped with Standard Steering.

If the main control valve is experiencing this issue the operator may notice a somewhat slow steering response up to approximately the mid-articulation position of the steering input command (STIC Position). At this point the machine may jerk as it transitions to a normal steering response. This will normally get worse as the hydraulic fluid warms to normal operating temperature.

AFFECTED PRODUCT

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Model	Identification Number
834G	BPC00168-00171, 175-177, 182, 189-191, 193, 195, 200
834H	BTX00153-00157, 160, 162-164, 168-169, 171-172, 175, 178-179, 183-185, 189-190, 192, 194-195, 197, 200-201, 203, 205, 207-208, 210-213, 217, 220, 222-229, 231-233, 235, 237-239, 241-243, 245, 249, 251, 300-302, 307, 310, 313, 316
836G	7MZ75001 BRL00447-00535, 75001-75002
836H	BXD00244-00512, 600-610, 10347

PARTS NEEDED

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Qty	Part Number	Description
3	1P3704	SEAL-RECTANGULAR
5	3J1907	SEAL-O-RING
2	3K0360	SEAL-O-RING
2	4J0524	SEAL-O-RING
4	6V8397	SEAL-O-RING
1	1553683	HOSE AS.
1	3069397	VALVE GP-STER

ACTION REQUIRED

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If the machine is experiencing the described symptoms the 149-0392 Main Steering Control Valve can be replaced with an improved 306-9397 Control Valve.

Since machines can be field converted from standard steering to secondary steering, you need to identify the steering configuration of the main steering control valve. In order to determine which configuration the machine is equipped with, refer to Images 1 and 2. Image 1 is for standard steering, and Image 2 is for secondary steering.

NOTE: This program only applies to machines with standard steering. If the steering configuration has been modified please contact the local Dealer Technical Communicator (T/C). The Dealer Technical Communicator (T/C) will contact the Caterpillar Hydraulic & Hydraulic Systems (H&HS) Service Engineering Group for additional instructions.

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Image1

Image2

SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-4000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
4001-8000 hrs, 25-48 mo	100.0%	50.0%	0.0%	0.0%	0.0%	50.0%

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NOTE: This is a 6.0-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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1. Park the machine on a flat surface away from operating equipment.

2. Connect the steering frame lock. Refer to Disassembly and Assembly Manual "Steering Frame Lock - Separate and Connect".

3. Release the hydraulic system pressure. Refer to Disassembly and Assembly Manual "Hydraulic System-Pressure Release".

NOTE: Cleanliness is an important consideration when servicing any hydraulic component or system. Before the disassembly procedure, the exterior of the component(s) should be thoroughly cleaned. This will prevent contamination from entering the system.

NOTE: Put identification marks on all lines, tubes, hoses, and wiring harness assemblies for installation purposes. Plug all lines, hoses, and tubes. This helps to prevent fluid loss and keeps contaminants from entering the system.

4. Remove the 149-0392 Main Steering Control Valve. Refer to Disassembly and Assembly Manual, RENR2193 for the 834G, 836G and RENR6224 for the 834H, 836H for instructions.

NOTE: If the machine has previously been modified with an external pilot drain line, the 191-6248 and 4E3664 Hose Assemblies along with the 7X0872 Swivel Tee and 6V8636 Connector will have to be removed from the hydraulic tank bulkhead. (See Image 1.1.1 Modified Configuration and Image 1.2.1 Original Configuration)

Image1.1.1

5. Install cap on tank bulkhead until you are ready to install the 155-3683 Hose Assembly as part of the normal installation procedure.

6. Install 306-9397 Steering Control Valve.

NOTE: If machine has been modified with an external pilot drain line, install a new 155-3683 Hose Assembly (See Image 1.2.1) when new steering control valve is installed.

Image1.2.1

7. Check the hydraulic fluid level. Add hydraulic fluid if necessary.

8. Remove the steering frame lock.

9. Perform functional steering test prior to re-commissioning machine.