Improved Transmission Intermediate Speed Sensor Is Now Used on Certain 700 Series Articulated Trucks {1408, 1439, 3030, 3073, 3167, 3175} Caterpillar


Improved Transmission Intermediate Speed Sensor Is Now Used on Certain 700 Series Articulated Trucks {1408, 1439, 3030, 3073, 3167, 3175}

Usage:

745 3F6
Articulated Truck
735C (S/N: LFJ1-254; TFJ1-333)
740 EJECTOR (S/N: 3F71-273; 3T71-165)
740C EJECTOR (S/N: LFN1-278; TFN1-202)
745 (S/N: 3F61-517; 3T61-436)
745C (S/N: JE81-90122; JE91-102; LFK1-1113; TFK1-1693)

Description Of Change: An improved transmission intermediate speed sensor is now used on the products listed above. The improved sensor is more robust to internal transmission dynamics and has better sensor resolution. This improvement aids in reducing occurrence of 674-8 and 675-8 (Abnormal Frequency, pulse width, or Period) codes and increases reliability of the sensor.

Adaptable To:

Table 1
Parts List 
Item  Qty  Part 
546-5409 Speed Sensor Gp 
8T-6912 Bolts 
354-5137 Spacers 
549-7410 Sensor Harness As 
The improved transmission intermediate speed sensor is adaptable to the products within the listed serial numbers, and is effective with all products after the listed serial numbers.

Rework Procedure for Sensor Replacement

------ WARNING! ------

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.


  1. Park the machine safely for service per the Operation and Maintenance Manual (OMM).

  2. Ensure the system is Locked Out and all stored energy is discharged per the Operation and Maintenance Manual (OMM).


    Illustration 1g06266516
    (A) Plate


    Illustration 2g06266518
    (B) Speed group sensor

  3. Locate speed group sensors (B) under plate (A) at the top of the transmission as shown in Illustration 1 and Illustration 2.


    Illustration 3g06266522
    (A) Plate
    (C) Bolt
    (D) Spacer

  4. Remove plate (A) by removing two bolts (C) and two washers (D) as shown in Illustration 3.

  5. Ensure the area is clean and free from debris.


    Illustration 4g06266518
    (B) Speed group sensor

  6. Remove the former speed group sensors (B).


    Illustration 5g06266549
    (1) 546-5409 Speed Sensor Gp
    (2) 8T-6912 Bolt
    (3) 354-5137 Spacer

  7. Install two new sensors (1) using bolt (2) and washer (3) as shown in Illustration 5.


    Illustration 6g06266803
    (4) 549-7410 Sensor Harness As

  8. Install new sensor harness assembly (4) as shown in Illustration 6.


    Illustration 7g06266804

  9. Reinstall plate (A) using two bolts (2) and two spacers (3) as shown in Illustration 7.

  10. Secure sensor harness assembly (4) and connector to plate (A) at the provided clip points.

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