2013/04/15 Caterpillar

Integrated Toolcarrier:

IT62H (S/N: M5G1-UP)

Wheel Loader:

950H (S/N: N1A1-UP; JAD1-UP; M1G1-UP; J5J1-UP; K5K1-UP; MXL1-UP; JLX1-UP)

962H (S/N: N4A1-UP; SSA1-UP; M3G1-UP; J6J1-UP; K6K1-UP; MAL1-UP; PCW1-UP)

Service Magazine SEPD1596, 15 April 2013, "Improved HMU Steering Lines are Now Available on Certain 950H and 962H Wheel Loaders". Disregard this article. Refer to the article that follows.

Description of Change: A new routing and improved hoses are now available for the machines listed. The new routing of the steering line will address an objectionable cab noise while articulating the machine.

Adaptable To: The new routing configuration is accomplished by redesign of the HMU return line to route directly to the hydraulic tank instead of the steering valve.

The modification procedure for replacing and rerouting the HMU hoses is included below.

Table 1

Parts List
Item	Qty	Part Number	Description	Former Part Number
For Serial Number Prefixes (N1A, JAD, M1G, J5J, K5K, N4A, M3G, J6J, K6K, MAL)
1	1	434-8825	Hose As	248-7467 (A)
2	1	434-8826	Hose As	250-0790 (B)
For Serial Number Prefixes (MXL, JLX, PCW, SSA)
1	1	435-5501	Hose As	154-1711 (A)
2	1	148-0913	Hose As	228-6422 (B)
All Machines
3	1	148-8433	Tee As	N/A
4	1	148-8411	Plug	N/A

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates.

1. Prepare machine for service. Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced for more details.

   1. Park the machine on a smooth, level surface. Move away from other operating machines and away from personnel. Lower the implements to the ground. Turn the engine start switch to the OFF position.

   2. Permit only one operator on the machine. Keep other personnel away from the machine or in sight of the operator.

   3. Lower the bucket and/or work tool to the ground.

      Note: When the bucket and/or work tool is raised for testing or adjusting, make sure that the work tool is supported correctly. Also, make sure that the work tool is in the full DUMP position.

   4. Engage the parking brake. Put blocks in front of the wheels and behind the wheels.

   5. Install steering frame lock in the LOCKED position so the machine cannot articulate.

   6. Release system pressure. Refer to Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced before performing the following procedure.

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Illustration 1	g03355235
(A) Hose (B) Hose (E) 349-6093 Metering Pump Gp

Note: Refer to 1 for the part number by serial number.

2. Remove Hose As. (A) from the 349-6093 Metering Pump Gp (E).

   Remove retaining hardware and set aside for reuse.

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Illustration 2	g03355275
(A) Hose (C) 142-4000 Steering Valve Gp (D) 357-4371 Connector As

3. Remove the other end of Hose As. (A) from the 142-4000 Steering Valve Gp (C) and set the hose aside.

4. Remove the 357-4371 Connector As (D) from the 142-4000 Steering Valve Gp (C) and set the connector aside.

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Illustration 3	g03355318
(4) 148-8411 Plug (C) 142-4000 Steering Valve Gp

5. Install the 148-8411 Plug (4) in place of the 357-4371 Connector As (D) in the 142-4000 Steering Valve Gp (C) .

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Illustration 4	g03355348

6. Remove Hose As. (B) and set aside.

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Illustration 5	g03355527
(1) Hose As. (3) 148-8433 Tee As (G) 357-4371 Connector As (H) 6V-8398 O-Ring Seal

7. Add the 148-8433 Tee As (3) to the straight end of Hose As. (2) .

   Install the Tee As (3) onto the existing 357-4371 Connector As (G) left open when Hose As. (B) was removed.

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Illustration 6	g03355499
(2) Hose As. (3) 148-8433 Swivel Tee As (F) 296-5662 Steering Neutralizer Valve (right-hand side)

8. Attach the 90 degree fitting of Hose As (2) to the right-hand 296-5662 Steering Neutralizer Valve. (F)

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Illustration 7	g03355455
(1) Hose As. (E) 349-6093 Metering Pump Gp

9. Install Hose As. (1) in place of Hose As. (A) at the 349-6093 Metering Pump Gp (E). Secure hose to machine with original hardware.

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Illustration 8	g03355390
(1) Hose As. (2) Hose As. (3) 148-8433 Swivel Tee As

10. Connect the Hose As. (1) to the 148-8433 Swivel Tee As (3) .

11. Refill hydraulic tank, if necessary. Verify machine operation. Check for any leaks. Complete any repairs. Return machine to service.

The new routing and improved hoses are adaptable to the following machines;

• IT62H (S/N: M5G1-UP)

• 950H (S/N: N1A1-UP; JAD1-UP; M1G1-UP; J5J1-UP; K5K1-UP; MXL1-521; JLX1-262)

• 962H (S/N: N4A1-UP; SSA1-228; M3G1-UP; J6J1-UP; K6K1-UP; MAL1-UP; PCW1-246)

The new routing and improved hoses are in effect with the following machines;

• 950H (S/N: JLX263-UP; MXL522-UP)

• 962H (S/N: SSA229-UP; PCW247-UP)