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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

    Cat Wiring Diagrams

    pushbroom, Jan 13, 2019 ... 2 3
    Replies:
    27
    Views:
    35,125
    Greenlee63
    Feb 13, 2024
  2. pushbroom

    Detroit Wiring Diagrams

    pushbroom, Jan 8, 2020 ... 2 3
    Replies:
    25
    Views:
    38,021
    Keepforgettingmypassword
    Sep 14, 2023
  3. pushbroom

    Cummins Wiring Diagrams

    pushbroom, Nov 20, 2019 ... 2
    Replies:
    15
    Views:
    36,513
    gthompson97
    Sep 26, 2023
  4. Goodysnap

    Click Click Boom!!!!!

    Goodysnap, May 14, 2020 ... 61 62 63
    Replies:
    626
    Views:
    61,967
    Shawn2130
    Apr 23, 2024 at 6:47 AM
  5. Gix1k

    Truck won't start

    Gix1k, Mar 1, 2020 ... 39 40 41
    Replies:
    403
    Views:
    29,382
    lwlevens
    Aug 25, 2020
  6. Gix1k

    Me again…this truck #%#%*!!!!!

    Gix1k, Feb 10, 2022 ... 34 35 36
    Replies:
    356
    Views:
    21,656
    terryt
    May 3, 2022
  7. truck 307

    CAT C15 /6NZ trouble continues

    truck 307, Dec 20, 2017 ... 32 33 34
    Replies:
    334
    Views:
    77,817
    Troy_
    Sep 3, 2020
  8. JoeyJunk

    12.7 Series 60- Issues after rebuild

    JoeyJunk, Aug 8, 2022 ... 24 25 26
    Replies:
    256
    Views:
    18,328
    Big Road Skateboard
    May 3, 2023
  9. Guntoter

    Need help understanding "New" codes in Paccar engine.

    Guntoter, Jul 26, 2015 ... 19 20 21
    Replies:
    205
    Views:
    151,494
    Noremorse
    Apr 21, 2022
  10. Wanabe1

    12.7 questions

    Wanabe1, Jun 17, 2019 ... 19 20 21
    Replies:
    203
    Views:
    9,380
    lwlevens
    Jul 7, 2019
  11. Modrob

    1986 GMC Astro rebuild...questions

    Modrob, Nov 8, 2017 ... 17 18 19
    Replies:
    185
    Views:
    16,208
    Modrob
    Feb 18, 2020
  12. 85COE

    question(s) for the Mechanics

    85COE, Mar 25, 2020 ... 16 17 18
    Replies:
    172
    Views:
    16,516
    85COE
    Apr 23, 2022
  13. Gix1k

    New trucker, new truck..big oil leak

    Gix1k, Dec 11, 2019 ... 16 17 18
    Replies:
    171
    Views:
    15,046
    Lowboy456
    Dec 23, 2019
  14. Kawi027

    FUEL IN OIL 2010 CUMMINS ISC 8.3

    Kawi027, Feb 22, 2018 ... 15 16 17
    Replies:
    160
    Views:
    34,734
    Kawi027
    Jul 3, 2018
  15. A5¢

    C15 Severe Coolant Loss

    A5¢, Jan 24, 2018 ... 13 14 15
    Replies:
    148
    Views:
    27,028
    Shawn2130
    Jul 10, 2020
  16. Rich W

    Which old engines??

    Rich W, Jun 7, 2022 ... 11 12 13
    Replies:
    128
    Views:
    7,795
    SmallPackage
    Jun 17, 2022
  17. Magnetic379

    3406e shutter missing

    Magnetic379, Jan 13, 2019 ... 11 12 13
    Replies:
    126
    Views:
    13,297
    lwlevens
    Dec 9, 2019
  18. Adisiwaya

    Big cam 3 400

    Adisiwaya, Aug 17, 2022 ... 10 11 12
    Replies:
    119
    Views:
    10,171
    Adisiwaya
    Mar 2, 2024
  19. Soon2BeOwnerOperator

    2000 KW W900 vs 2000 FREIGHTLINER FLD132 CLASSIC XL

    Soon2BeOwnerOperator, May 27, 2023 ... 10 11 12
    Replies:
    114
    Views:
    5,633
    Rideandrepair
    Jun 9, 2023
  20. WREN

    My recaps

    WREN, Nov 9, 2019 ... 10 11 12
    Replies:
    112
    Views:
    7,696
    PE_T
    Nov 20, 2019
  21. 704mover

    3406b turbo upgrade???

    704mover, Mar 8, 2018 ... 10 11 12
    Replies:
    111
    Views:
    45,744
    OldRed98
    Jan 6, 2021
  22. God prefers Diesels

    Clutch R&R questions

    God prefers Diesels, Dec 3, 2020 ... 9 10 11
    Replies:
    107
    Views:
    9,503
    BoxCarKidd
    Dec 11, 2020
  23. markk

    Dirty road water covering mirrors, glass

    markk, Dec 22, 2023 ... 9 10 11
    Replies:
    103
    Views:
    4,120
    shatteredsquare
    Feb 3, 2024
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