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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

    Detroit Wiring Diagrams

    pushbroom, Jan 8, 2020 ... 2 3
    Replies:
    26
    Views:
    74,909
    Oleg D
    Jun 2, 2025
  2. pushbroom

    Cummins Wiring Diagrams

    pushbroom, Nov 20, 2019 ... 2
    Replies:
    16
    Views:
    54,484
    envycarz
    Jun 4, 2024
  3. pushbroom

    Cat Wiring Diagrams

    pushbroom, Jan 13, 2019 ... 2 3
    Replies:
    27
    Views:
    58,850
    Greenlee63
    Feb 13, 2024
  4. City-Boy

    99 freightliner differential temps

    City-Boy, Feb 17, 2026 at 1:12 AM
    Replies:
    2
    Views:
    78
    City-Boy
    Feb 17, 2026 at 8:52 AM
  5. mile marker 27

    400 BC build

    mile marker 27, Jan 21, 2026
    Replies:
    8
    Views:
    513
    mile marker 27
    Feb 17, 2026 at 7:24 AM
  6. Mr79W900A

    1994 Kenworth t800 headliner screw locations

    Mr79W900A, Feb 11, 2026 at 12:12 PM
    Replies:
    1
    Views:
    176
    Inderjit
    Feb 14, 2026 at 9:57 AM
  7. skoontz

    TSBs search for newer Cascadia

    skoontz, Feb 13, 2026 at 1:00 PM
    Replies:
    0
    Views:
    121
    skoontz
    Feb 13, 2026 at 1:00 PM
  8. MRMTRANS

    RTV Silicone Removal

    MRMTRANS, Feb 6, 2026 ... 2
    Replies:
    13
    Views:
    481
    W923
    Feb 12, 2026 at 8:21 PM
  9. flatbed85

    Detroit series 60 oil pressure question .

    flatbed85, Jan 15, 2021 ... 2
    Replies:
    13
    Views:
    15,905
    cgandara2318
    Feb 12, 2026 at 12:03 PM
  10. Flatbed4Ever

    DD15 Oil Suction Manifold Modification

    Flatbed4Ever, Feb 12, 2026 at 8:13 AM
    Replies:
    0
    Views:
    176
    Flatbed4Ever
    Feb 12, 2026 at 8:13 AM
  11. istumped

    S13 Engines Good or Bad

    istumped, Feb 9, 2026
    Replies:
    2
    Views:
    268
    Otr Traveler
    Feb 11, 2026 at 8:14 AM
  12. Mr79W900A

    Headliner removal screw locations

    Mr79W900A, Feb 10, 2026
    Replies:
    2
    Views:
    198
    Mr79W900A
    Feb 10, 2026
  13. Notiller12

    N14 Boost pressure

    Notiller12, Feb 10, 2026
    Replies:
    0
    Views:
    150
    Notiller12
    Feb 10, 2026
  14. Dwight Goertzen

    Repairing steel a/c line

    Dwight Goertzen, Feb 7, 2026
    Replies:
    7
    Views:
    311
    W923
    Feb 9, 2026
  15. rosnorter

    Repairing Paccar ECM

    rosnorter, May 20, 2022 ... 2
    Replies:
    15
    Views:
    8,245
    Goodysnap
    Feb 9, 2026
  16. 91flattop378

    1991 378 looking for info

    91flattop378, Dec 16, 2021
    Replies:
    4
    Views:
    1,307
    Bigpiney
    Feb 9, 2026
  17. mile marker 27

    Bore brush recommendations for Cat and Cummins blocks

    mile marker 27, Feb 7, 2026
    Replies:
    4
    Views:
    357
    mile marker 27
    Feb 8, 2026
  18. parkway

    3406B coolant in oil (oil analysis), fuel in coolant

    parkway, Feb 6, 2026
    Replies:
    5
    Views:
    274
    mtoo
    Feb 8, 2026
  19. Ricardo Trucking

    CAT C15 NXS JAKE WEAK

    Ricardo Trucking, Feb 6, 2026
    Replies:
    4
    Views:
    260
    Ricardo Trucking
    Feb 8, 2026
  20. 1Logger1

    Parking brake slow to engage

    1Logger1, Feb 7, 2026
    Replies:
    8
    Views:
    301
    Star Rider
    Feb 7, 2026
  21. EasttxDT

    NoSlack II 5th Wheel handle not locking open

    EasttxDT, Feb 3, 2026
    Replies:
    8
    Views:
    362
    MRMTRANS
    Feb 7, 2026
  22. PE_T

    How long is the Detroit One-Box supposed to last?

    PE_T, May 23, 2020 ... 6 7 8
    Replies:
    78
    Views:
    37,504
    xsetra
    Feb 7, 2026
  23. SIVRTNGE2

    CAT 256-8753 Seal

    SIVRTNGE2, Feb 6, 2026
    Replies:
    9
    Views:
    241
    SIVRTNGE2
    Feb 6, 2026
Showing threads 1 to 20 of 9,680

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