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Heavy Duty Diesel Truck Mechanics Forum

For mechanics and owners of shops servicing semi trucks and Class 7-8 vehicles. Repairs, troubleshooting and business advice.

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  1. pushbroom

    Cummins Wiring Diagrams

    pushbroom, Nov 20, 2019 ... 2
    Replies:
    16
    Views:
    46,977
    envycarz
    Jun 4, 2024
  2. pushbroom

    Cat Wiring Diagrams

    pushbroom, Jan 13, 2019 ... 2 3
    Replies:
    27
    Views:
    47,718
    Greenlee63
    Feb 13, 2024
  3. pushbroom

    Detroit Wiring Diagrams

    pushbroom, Jan 8, 2020 ... 2 3
    Replies:
    25
    Views:
    54,664
    Keepforgettingmypassword
    Sep 14, 2023
  4. City-Boy

    Eaton 8LL

    City-Boy, Apr 29, 2025 at 4:36 PM ... 2
    Replies:
    13
    Views:
    392
    City-Boy
    Apr 30, 2025 at 10:20 AM
  5. ljesko13

    ‘21 Cascadia with DD15, not using DEF.

    ljesko13, Apr 11, 2025 ... 2
    Replies:
    12
    Views:
    522
    Antinomian
    Apr 29, 2025 at 3:19 PM
  6. OFT2024

    C13 eco won’t communicate deleted

    OFT2024, Nov 11, 2024
    Replies:
    3
    Views:
    334
    OFT2024
    Apr 28, 2025 at 11:30 PM
  7. towtrucker

    2018 Freightliner secondary air leak only when moving

    towtrucker, Mar 18, 2019 ... 2 3 4
    Replies:
    33
    Views:
    13,360
    Levgenii
    Apr 27, 2025 at 7:22 PM
  8. eysyey

    2013 T660 ELECTRICA/ECU COMMUNICATION ISSUES

    eysyey, Apr 27, 2025 at 9:14 AM
    Replies:
    1
    Views:
    111
    eysyey
    Apr 27, 2025 at 9:14 AM
  9. W923

    L9000 ford air filters

    W923, Apr 24, 2025 at 10:33 PM ... 2
    Replies:
    10
    Views:
    339
    SmallPackage
    Apr 26, 2025 at 9:53 PM
  10. Shane1993

    2016 Peterbilt 579

    Shane1993, Apr 24, 2025 at 7:50 AM
    Replies:
    1
    Views:
    216
    LongHaulTrailer
    Apr 25, 2025 at 3:13 PM
  11. Binderdavemays1

    84 IH 9670 front hub swap

    Binderdavemays1, Apr 24, 2025 at 6:40 AM
    Replies:
    3
    Views:
    197
    Binderdavemays1
    Apr 25, 2025 at 2:09 AM
  12. Dmdra1

    Oil in water and water in oil cummins is 15

    Dmdra1, Jan 3, 2022
    Replies:
    1
    Views:
    891
    Pitboss428
    Apr 24, 2025 at 11:33 PM
  13. Juanyi

    TRANSMISSION FAULT ABS J1939 FAULT CODE 369 KENWORTH (2020) T680.

    Juanyi, Feb 1, 2022 ... 2
    Replies:
    10
    Views:
    4,522
    Rodeorowdy
    Apr 24, 2025 at 3:48 AM
  14. mile marker 27

    Injector push tube screw; small cam vs. big cam 1-3 vs. big cam 4

    mile marker 27, Feb 19, 2024
    Replies:
    5
    Views:
    812
    Doublemint-k100
    Apr 23, 2025
  15. rolls canardly

    How is this possible??

    rolls canardly, Apr 21, 2025 ... 2
    Replies:
    13
    Views:
    788
    Ridgeline
    Apr 23, 2025
  16. ran99

    A/c cycling on and off

    ran99, Apr 18, 2025 ... 2 3 4
    Replies:
    33
    Views:
    1,147
    Rideandrepair
    Apr 22, 2025
  17. kleese2

    And, Stability and hill assist lights

    kleese2, Apr 1, 2025
    Replies:
    2
    Views:
    264
    kleese2
    Apr 22, 2025
  18. montrose818

    California CARB smog check software

    montrose818, Dec 3, 2024
    Replies:
    5
    Views:
    697
    biofumes
    Apr 21, 2025
  19. Ol’ Son

    3406B/C Frankenstein

    Ol’ Son, Feb 6, 2025 ... 5 6 7
    Replies:
    61
    Views:
    2,956
    wore out
    Apr 20, 2025
  20. sonnyca

    SPN 520342 FMI 17 - Cascadia

    sonnyca, Apr 20, 2025
    Replies:
    4
    Views:
    196
    sonnyca
    Apr 20, 2025
  21. north60

    X15 Misfire on All 6 Cylinders

    north60, Aug 13, 2021
    Replies:
    8
    Views:
    12,350
    Trkn4u
    Apr 20, 2025
  22. Trenton325

    One Box Emissions

    Trenton325, May 7, 2024
    Replies:
    7
    Views:
    696
    cascadia4life
    Apr 20, 2025
  23. Diesel Dave Australia

    N14 Block 855 build.

    Diesel Dave Australia, Aug 23, 2023 ... 2
    Replies:
    15
    Views:
    2,495
    hatchhero
    Apr 19, 2025
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