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  1. P

    CHALLENGER A/C not cooling

    tx shouldn’t be blocked as it’s brand new. I bridged high pressure switch but gauge got to 450 and I plugged it back in. I’ve let a bit of gas out and it seems to have stabilised. High side is on 350psi and low side is on 20psi. The compressor is now engaged constantly Cab is much cooler now...
  2. P

    CHALLENGER A/C not cooling

    30psi when cut in 60psi when cut out Ambient temp is 39 degrees Celsius
  3. P

    CHALLENGER A/C not cooling

    Hi all, Any air con gurus out there? I have a Cat challenger 875c and have just replaced the compressor drier and TX valve. (Front seal of last compressor failed) after replacing the parts I vacuumed the system down and checked for any leaks. Once I knew the system was tight I put 2.2kg of...
  4. P

    3408 leak down test

    Hey guys, has anyone done a cylinder leak down test on an old 3408? Or a better way to test for a blown head gasket or cracked head?
    • PHDiesel
    • Thread
    • 3408 631d cat cylinder gasket head overheating scraper
    • Replies: 2
    • Forum: Scrapers
  5. P

    CAT 631D overheating

    I have had the water pump off and it’s in good condition. Is it possible to get a pressure test kit for those old radiator caps?
  6. P

    CAT 631D overheating

    Hey guys, Got a 631D with a 3408 engine overheating. Top radiator hose measures 110-120 degrees Celsius. But the bottom hose is back at 70 degrees Celsius. Engine is still overheating into the red and the top tank seems to be pressurised severely. Just had the radiator out and flushed at a...
    • PHDiesel
    • Thread
    • 3408 cat caterpillar overheating scraper
    • Replies: 6
    • Forum: Scrapers
  7. P

    A25c no gear select

    Can anyone tell me what pin on the trans ecu feeds power to sensors inside trans (turbine speed etc)
  8. P

    A25c no gear select

    And what was your fate?
  9. P

    A25c no gear select

    Got the contronic working, found one of the fuse holders that supplies power to ECU2 loose. Service display is showing transm.comm ER
  10. P

    A25c no gear select

    I am wondering if it is linked to the display unit not having any power, because I also found that the ECU2 which provides information to the display also has no power. Transmission ecu has 24v supply in pins 2, 20, 16 and 17, and the gear selector has power going in and out
  11. P

    A25c no gear select

    truck is idling at 800rpm. Building up to 700kpa air presssure
  12. P

    A25c no gear select

    Hi all, Have a volvo A25C. Truck will not select any gears forward or reverse, and the alarm buzzer sounds when you try and select a gear. Contronic display unit also not working so am unable to retrieve a code Cheers
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