2014/10/08 Caterpillar

Articulated Truck:

725 (S/N: B1L1-UP)

730 (S/N: B1M1-UP)

730 EJECTOR (S/N: B1W1-UP)

Description of Change: In certain operating conditions, the oil tubes between the retarder control valve and the power train oil cooler may leak due to corrosion. Materials may build up in the crankcase guard and contact the tubes. The tubes may be replaced with hoses which have a higher resistance to corrosion in certain environments.

Adaptable To: The hoses are not direct replacements for the tubes. Additional parts are required to replace the tubes with the hoses. Refer to Table 1 for a list of parts required to replace the tubes with hoses.

The hoses are adaptable to the following machines:

• 725 (S/N: B1L1-UP)

• 730 (S/N: B1M1-UP)

• 730 EJ (S/N: B1W1-UP)

Reference

ReferenceDisassembly and Assembly, RENR3446, "725, 730 and 730 Ejector Articulated Trucks Engine Supplement "

Rework Procedure

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Illustration 1	g03693867
(A) Retarder Control Valve (B) Power train Oil Cooler

1. Remove the crankcase guards and locate the tubes between the Retarder Control Valve (A) and the power train Oil Cooler (B). Refer to Disassembly and Assembly, RENR3446, "725, 730 and 730 Ejector Articulated Trucks Engine Supplement ".

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Illustration 2	g03693874
(C) Wiring Plug

2. Disconnect the Wiring Plug (C) for the transmission oil temperature sensor. Refer to Illustration 2.

3. Position a suitably sized container under the tubes between the retarder control valve and the oil cooler.

4. Remove tubes from the machine.

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Illustration 3	g03693880
(D) Transmission Oil Temperature Sensor (E) Block

5. Remove the Transmission Oil Temperature Sensor (D) from the Block (E). Retain the sensor. Refer to Illustration 3.

   Retain the following parts:

   • The support clips for the transmission temperature sensor wiring harness

   • The split flanges, bolts, and washers which secured the tubes to the retarder valve

   Note: The tubes and remaining hardware may be discarded.

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Illustration 4	g03693897
(D) Transmission Oil Temperature Sensor (3) 432-1401 Block (14) 3J-1907 O-Ring Seal

6. Install a new O-Ring Seal (14) on the Transmission Oil Temperature Sensor (D). Install the sensor in the threaded port in the upper face of Block (3). Refer to Illustration 4.

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Illustration 5	g03693920
(3) 432-1401 Block (9) 1P-3708 Rectangular Seal r

7. Install a Rectangular Seal (9) in the seal groove on the rear face of Block (3). Refer to Illustration 5.

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Illustration 6	g03693927

8. Clean the area around the lower port of the power train oil cooler. Ensure that all sealing surfaces are free of dirt and rust. Refer to Illustration 6.

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Illustration 7	g03693936
(3) 432-1401 Block (8) 8T-4223 Hard Washer (11) 0S-1573 Bolt

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Illustration 8	g03694596
Wiring Harness Clips (16) 3S-2093 Cable Strap

9. Bolt the Block (3) and sensor assembly onto the lower port of the power train oil cooler. Use Bolts (11), four Hard Washers (8), and support clips for the transmission temperature sensor wiring harness. Reconnect the wiring for the temperature sensor secure to the lower clip using two Cable Straps (16). Refer to Illustrations 7 and 8.

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Illustration 9	g03693971
(4) 460-2704 Plate (9) 1P-3708 Rectangular Seal

10. Install a Rectangular Seal (9) into the groove on the rear face of Plate (4). Refer to Illustration 9.

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Illustration 10	g03693988
(4) 460-2704 Plate (6) 2B-0947 Bolt (8) 8T-4223 Hard Washer

11. Clean the area around the upper port of the power train oil cooler. Ensure that all sealing surfaces are free of dirt and rust. Attach Plate (4) to the upper port using two Bolts (6) and Hard Washers (8). Install the bolts in the upper right-hand and lower left-hand holes. Refer to Illustration 10.

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Illustration 11	g03693993
(5) 5P-5581 Half Flange (6) 2B-0947 Bolt

12. Install one Half Flange (5) using one Bolt (6) and original washer. Refer to Illustration 11.

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Illustration 12	g03694000
(2) 432-8341 Hose As (5) 5P-5581 Half Flange (6) 2B-0947 Bolt (7) 4J-0524 O-Ring Seal (8) 8T-4223 Hard Washer

13. Install a new O-Ring Seal (7) into the seal groove at the 90-degree elbow end of Hose As (2). Attach the hose to the upper port of the power train oil cooler. Secure using one Half Flange (5), one Bolt (6), and Hard Washer (8). Refer to Illustration 12.

    Note: Do not fully tighten the bolts at this time

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Illustration 13	g03694007
(2) 432-8341 Hose As (7) 4J-0524 O-Ring Seal

14. Install a new O-Ring Seal (7) into the seal groove at the 45-degree swept elbow end of Hose As (2). Attach the hose to the upper port of the retarder valve using the retained hardware. Refer to Illustration 13.

    Note: Do not fully tighten the bolts at this time

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Illustration 14	g03694020
(1) 432-8340 Hose As (3) 432-1401 Block (8) 8T-4223 Hard Washer (10) 8T-4183 Bolt (12) 173-1437 Half Flange (13) 4J-0522 O-Ring Seal

15. Install a new O-Ring Seal (13) into the seal groove at the 90-degree elbow end of Hose As (1). Attach the hose to the open port of Block (3) using the two Half Flanges (12), four Bolts (10), and four Hard Washers (8). Refer to Illustration 14.

    Note: Do not fully tighten the bolts at this time

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Illustration 15	g03694040
(1) 432-8340 Hose As (7) 4J-0524 O-Ring Seal

16. Install a new O-Ring Seal (7) into the seal groove at the 45-degree swept elbow end of Hose As (1). Attach the hose to the lower port of the retarder valve using the original retained hardware. Refer to Illustration 15.

    Do not fully tighten the bolts at this time

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Illustration 16	g03694056
(E) Power train Oil Cooler Support Bracket (1) 432-8340 Hose As (2) 432-8341 Hose As (15) 6U-0456 Strap

17. Orient Hoses (1) and (2) to ensure no contact to any of the surrounding components of the machines. Tighten all bolts at this time. Refer to Illustration 16.

18. Tie Hoses (1) and (2) together using two Straps (15). Ensure that the hoses do not contact the power train Oil Cooler Support Bracket (E). Refer to Illustration 16.

19. Referring to the Operation and Maintenance Manual for your machine, start the engine and check for oil leaks.

20. Referring to the Operation and Maintenance Manual, check and top off the transmission oil as necessary.

21. Reinstall the crankcase guards.