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JoeH

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Everything posted by JoeH

  1. JoeH
    Go to the Mack EMedia website and search for book 8-211, click View File. Everything you need should be in it.
  2. JoeH
    Could you imagine being shot wearing that? You're basically guaranteeing further injury by having one of your own bullets exploding against you, lol.
  3. JoeH
    Congratulations on the baby and the truck too! We have a 79 R686ST, fantastic truck, but ours has reached the end of it's hard working days. We just had our 5th 4 months ago.
  4. JoeH
    If you need weight capacity/more surface contact to the ground you can run 315 dualies on 9"x22.5" rims. Tires rated usually from 8600 lbs to 10,000 lbs. 9"x22.5" rims are rated for 10,000 lbs, 8.25" rims are rated for 7500 lbs. I have a former trash truck now Volumetric Concrete Mixer that has 315's on the drives and lift, and I put 425's on the steering axle (rated around 12,000 lbs).
  5. JoeH
    Short of finding a good 5 speed that matches, staying with a manual trans of some variation makes the most sense.
  6. JoeH
    Have you put a test light to the wires on the headlight plugs? It is possible both highbeam filaments have failed. Just trying to think simplest/cheapest.
  7. JoeH
    It is possible someone wired everything onto the one switch on the right, but the switch isn't rated for that much electricity to go through it. Unless they wired it to control a relay instead. I know headlight switches melting is a common problem on older pickups, so they sell aftermarket relay kits where the headlight switch controls the relays instead.
  8. JoeH
    If you pick up that book I mentioned earlier it should largely have everything you need diagram-wise.
  9. JoeH
    You're missing your clearance lamp switch to the left of the dimmer. The switch to the right of the dimmer is park lamps down and park/headlights up. Middle is off. The Signal switch up top to left of steering wheel is forward flashes headlights, backward flashes taillights. Center dimmer switch controls the dash gauge brightness.
  10. JoeH
    Gear ratios should be stamped into the differentials. You can reach out to the Mack Museum in Macungie to get info on what tires the truck was originally built with.
  11. JoeH
    Headlight hi/lo beam switch should be a button on the floor, for your left foot to push. Is this the dimmer switch you're referring to or are you talking about the dash mounted interior lights dimmer?... Just want to make sure we're talking about the right switches here.
  12. JoeH
    What year are truck/engine is it?
  13. JoeH
    I like closed shoulder/open center for my tire treads. Closed shoulder really helps each pair of tires to wear evenly. Open center gives that occasionally needed off-road grip. We replace tires one pair at a time. New pair goes on, old pair goes out to get capped, then it'll replace the next pair to get thin or blow a tire.
  14. JoeH
    Is the software/EECU the same? Id expect some minor brand software differences.
  15. JoeH
    Pictures don't show you much other than a plethora of wires. Double check, but I don't think there's any TCM. Just data sensors for the engine ECU. Trans temp, neutral safety switch, VSS, etc. You can see the PTO plate on top. Your best bet on donor will be a trash truck or an Oshkosh front discharge concrete truck. I have a 2000 MR688 cutoff with the HT740 cable shift, my 2003 MR688 has an HD4560 which has all sorts of electronics onboard. Pictures not posting, I'll try and get them up....
  16. JoeH
    Any codes? Long cranks before start sometimes means your either your cam or crank position sensor isn't reading.
  17. JoeH
    Vmac I, ii or III is which generation of electronics the truck has.
  18. JoeH
    Flywheel housing and flywheel are likely your biggest obstacles.
  19. JoeH
    Cable shifted HT740 is probably your best bet. Do you need a pto? The port on the 740 is literally on top, which can be a pain in the @$$ on space. I'll snap a picture of the HT740 I have sitting behind a spare engine from a 2000 MR688.
  20. JoeH
    $7 through your local Mack Dealer, shop manual # 8-501.
  21. JoeH
    You changed the coolant level sensor or the coolant temp sensor?
  22. JoeH
    Are you low on coolant? Not sure about the 1997, but the E7 ETECH engines use 2 oil sensors, one for the dash gauge and the other for the EECU or VECU. You need to make sure you replace the one for computers if that's the cause of the shutdowns. I'm guessing this engine is vmac I or vmac ii, I don't think vmac III was rolled out yet. If by chance it's vmac III you should be able to pull blink codes out of the check engine light. Typically the engine shutdown light is controlled by low coolant level and low oil pressure. Possibly high water temp too.
  23. JoeH
    Get a Degree Wheel.
  24. JoeH
    I got a new phone so I don't have my pictures on it, but a crane is a fantastic toy to have. Got an engine to pull? No problem! Got frame rails on a truck inside the garage that need to come out? No problem! Got a dead tree you need to push over? No problem!
  25. JoeH
    I find that hard to believe. My '79 r686st doesn't have an hour meter it has an "engine revs x 100,000" meter. If you have a true hour meter on there then I expect it's not original, and not accurate.

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