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

    Detroit Wiring Diagrams

    pushbroom, Jan 8, 2020 ... 2 3
    Replies:
    26
    Views:
    87,586
    Oleg D
    Jun 2, 2025
  2. pushbroom

    Cummins Wiring Diagrams

    pushbroom, Nov 20, 2019 ... 2
    Replies:
    16
    Views:
    59,382
    envycarz
    Jun 4, 2024
  3. pushbroom

    Cat Wiring Diagrams

    pushbroom, Jan 13, 2019 ... 2 3
    Replies:
    27
    Views:
    65,626
    Greenlee63
    Feb 13, 2024
  4. KFF

    12.7l Detroit stumble on first take off

    KFF, Aug 27, 2026 ... 2 3
    Replies:
    21
    Views:
    799
    KFF
    Oct 7, 2026 at 10:23 AM
  5. o1reb

    09 columbia htr mtr fuse location

    o1reb, Oct 6, 2026 at 5:17 PM
    Replies:
    1
    Views:
    104
    Concorde
    Oct 6, 2026 at 6:24 PM
  6. Willis Inc.

    440G ?

    Willis Inc., Oct 5, 2026 at 1:10 PM
    Replies:
    0
    Views:
    162
    Willis Inc.
    Oct 5, 2026 at 1:10 PM
  7. spindrift

    Volvo Eco-Torque

    spindrift, Sep 28, 2026
    Replies:
    1
    Views:
    265
    MRMTRANS
    Sep 30, 2026
  8. tnc110

    Cat 475 vs 550 vs 625

    tnc110, Nov 2, 2017 ... 4 5 6
    Replies:
    58
    Views:
    66,628
    HISPEED428
    Sep 27, 2026
  9. Perchie15

    Bypass ABS wires?

    Perchie15, Sep 26, 2026
    Replies:
    9
    Views:
    464
    Zeus 49
    Sep 27, 2026
  10. Mwwade

    1993 international hydraulic brake problem

    Mwwade, May 29, 2018 ... 2
    Replies:
    11
    Views:
    18,816
    SpragO
    Sep 25, 2026
  11. Almach

    Liner protrusion 60 series Non-EGR

    Almach, Aug 25, 2026
    Replies:
    5
    Views:
    449
    Big Road Skateboard
    Sep 23, 2026
  12. Rideandrepair

    Yikes!!

    Rideandrepair, Sep 13, 2026 ... 2
    Replies:
    13
    Views:
    840
    Flat Earth Trucker
    Sep 23, 2026
  13. mariutzs

    23 Pete 579 – constant vibration gets much worse when braking

    mariutzs, Sep 22, 2026 ... 2
    Replies:
    14
    Views:
    660
    mariutzs
    Sep 23, 2026
  14. DieselDeck

    Techs who went independent or started mobile what tripped you up?

    DieselDeck, Sep 14, 2026 ... 2
    Replies:
    15
    Views:
    996
    Diesel Dave
    Sep 20, 2026
  15. mocandrei

    Metal in oil pan Detroit s60 12.7

    mocandrei, Sep 16, 2026
    Replies:
    2
    Views:
    299
    Big Road Skateboard
    Sep 16, 2026
  16. Adisiwaya

    1985 kenworth w900b project

    Adisiwaya, Apr 9, 2024 ... 11 12 13
    Replies:
    128
    Views:
    17,560
    Adisiwaya
    Sep 16, 2026
  17. frenchbrokers

    Spn1347 fmi16 / p0094 on mx13

    frenchbrokers, Sep 8, 2026
    Replies:
    1
    Views:
    292
    WitchingHour
    Sep 14, 2026
  18. TallJoe

    Front differential metal shavings.

    TallJoe, Feb 23, 2021 ... 4 5 6
    Replies:
    50
    Views:
    12,149
    outlaw12
    Sep 14, 2026
  19. Zamistro

    Is this a service body crane a roll of stinger or what?

    Zamistro, Sep 14, 2026
    Replies:
    0
    Views:
    275
    Zamistro
    Sep 14, 2026
  20. Pilot53

    Freightliner Columbia shaking above 60

    Pilot53, Oct 3, 2025 ... 2
    Replies:
    17
    Views:
    2,154
    2021 western star
    Sep 11, 2026
  21. Ninja2813

    2009 Kenworth T8 series leveling valve problems

    Ninja2813, Sep 10, 2026
    Replies:
    3
    Views:
    295
    Ninja2813
    Sep 11, 2026
  22. Westrada1982ok

    2019 Kenworth T680 / Cummins X15 – Intermittent throttle issue

    Westrada1982ok, Aug 31, 2026
    Replies:
    4
    Views:
    390
    Raffito
    Sep 5, 2026
  23. columbia684

    Rear axle

    columbia684, Sep 1, 2026
    Replies:
    5
    Views:
    467
    columbia684
    Sep 1, 2026
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