2012/02/27 Caterpillar

Transmission:

TH55FT-E70 (S/N: PCJ1-UP)

Description of Change: A new improved torque converter inlet tube assembly that is more reliable is used with TH55 FT-E70 Petroleum Transmission.

Replace the existing torque converter inlet tube assembly with the new improved torque converter inlet tube assembly. Refer to Table 1 for the new tube assembly and seals.

Adaptable To: The new 371-2894 Tube As is a direct replacement for the former 304-3355 Tube As .

The procedure is effective with the following machines:

• TH55FT-E70 (S/N: PCJ1182)

• TH55FT-E70 (S/N: PCJ315-1181)

Safety Section

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility.

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Personal injury or death can result from improperly checking for a leak. Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

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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.

Required Parts

Procedure to Install New Torque Converter Inlet Tube

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Illustration 1	g02878857
Right side view

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Illustration 2	g02881516
View of Area A (3) 304-3354 Tube As (4) Hose assembly (5) Block (6) Elbow assembly (7) Bolt (8) Clamp assembly (9) Tube assembly

1. Remove clamp assembly (8) between tube assembly (3) and tube assembly (9) .

2. Remove tube assembly (9) at the barrel nut and split flange.

3. Remove tube assembly (3) at the barrel nut and split flange.

4. Remove one end of hose assembly (4) from elbow assembly (6) .

5. Remove elbow assembly (6), or loosen in order to access four bolts (7) in block (5) .

6. Loosen four bolts (7) in block (5) .

   Note: Loosening the four bolts will allow block (5) to be aligned properly when the new tube assembly (3) is assembled.

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Illustration 3	g02878858
View of Area A with parts removed (2) 228-7095 O-Ring Seal (3) 371-2894 Tube As (5) Block (7) Bolt (9) Tube assembly (10) Elbow Assembly

7. Assemble the new tube assembly (3) with a new o-ring seal (2). Start by tightening the nut end of tube assembly (3) hand-tight on the elbow assembly (10) .

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Illustration 4	g02878859
View B-B with parts removed (1) 7F-8267 O-Ring Seal (3) 371-2894 Tube As (11) Split flanges, washers, and bolts

8. Leave four bolts (7) loose in block (5). Position the opposite end of tube assembly (3) with o-ring seal (1) on the filter. Then install the split flanges, washers, and bolts (11) .

9. Torque four bolts (7) in block (5) .

10. Torque the barrel nut end of tube assembly (3) to final torque.

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Illustration 5	g02881516
View of Area A (3) 304-3354 Tube As (4) Hose assembly (5) Block (6) Elbow assembly (7) Bolt (8) Clamp assembly (9) Tube assembly

11. Reassemble elbow assembly (6) to block (5) .

12. Reassemble hose assembly (4) to elbow assembly (6) .

13. Reassemble tube assembly (9) with a new o-ring seal (1) and a new o-ring seal (2) .

14. Reassemble clamp assembly (8) between tube assembly (3) and tube assembly (9) .