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Midland Oilfield

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About Midland Oilfield

  • Rank
    Engine Started

Profile Information

  • Location
    Midland Texas

Forum Info

  • Make
    Fleet
  • Model
    Fleet
  • Year
    1992 to 2017
  • Other Trucks
    Mack, Pete, KW, International

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  1. There are 2 double check valves on the foot valve, I replaced these valves when I changed the foot valve. Also this is doing the same thing with the second trailer I hooked up to it. I have changed valves on the trucks brake system also just to see if by some chance if air was leaking through. This truck is plumbed a bit different to me. Also I don't think it will matter but this truck started life as a bobtail dump truck and then someone converted the truck to haul a trailer and turned it into a kill truck. We've had this truck for about 10 years and this just started a few weeks ago, so I don't think it has anything to do with the way they rigged it up just giving information. Also I put a gauge on the double check again with this separate trailer and if I have 120 psi in my air tanks the blue line will send around 110 psi to the trailer, and when you let off the brake pedal the valves and the quick release only drop around 30 psi. Then the ABS valve on the trailers will start to slowly open and close dropping around 10 psi every time they open until all the air is gone. I have hooked up to other trucks and trailers with the gauge and when you hit the pedal with them it will pressure up the same but will drop all of the air to zero on the blue line as soon as you let off the brake pedal.
  2. 432-742-5400 is their head office in Midland, Tx 432-683-1888 is the number to 1 of their yards in Midland also. Hope this helps.
  3. I have a 2001 Mack RD688S I am hoping someone can help. The truck brakes are working fine on this truck, but the trailer brakes are locking down after you hit the brake pedal 4 to 5 times. I have hooked a gauge to the blue line and it builds up pressure every time you use the brake pedal instead of releasing it all. I have gone through and replaced the trailer supply button in the cab, the foot pedal, the tractor protection valve (twice), and added a quick release between the tractor protection valve and the glad hands to the trailer. I have also replaced both air valves on the trailer for other reasons, and ran a new line from the tractor protection valve and the quick release to the glad hands just to see if the air line itself was causing it. I have also tested the hand valve and it works fine. I've searched and asked around my area and nobody has any idea what might be causing this, any help from the BMT community would be awesome.
  4. Could that cause the other issues I’m having with the truck?
  5. If that's on the blink codes then 5-7 is the engine oil level and 7-5 is Battery/Alternator voltage. Batteries could be bad or your alternator could be going out. And the oil level could be low or the sensor could be going bad.
  6. I am working on a 2013 Mack GU713, with an MP8 in it. Over the last 2 weeks or so I've put in a new radiator, engine wiring harness, DEF wiring harness, DEF level sensor, engine oil level sensor, water pump, fan clutch, and new batteries. I have also pulled all grounding cables and polished them and the studs they connect to. Now the issue in having is that the truck will run, but for a unknown amount of time before it shuts itself off. When the truck shuts itself off the DEF gauge on the dash goes to empty and the truck will not turn over. Disconnecting the batteries will not reset anything to get the engine running again. The only way I have found to reset everything to get the truck started again is to pull fuse F38 for the engine ECU under the kick panel. When I pull this fuse every time the fuse isn't blown, I've swapped it with other fuses just to be sure. But once I put it back in the Def gauge goes to where it should be and the truck will fire up and run. Sometimes it runs for a few minutes or for a few hours before it shuts itself down again. And I have checked all my connections multiple times from the 2 harnesses I replaced and I have checked all fuses and relays and have wiggled more wires than I knew were there. Also when the truck dies Premium Tech Tool (PTT) doesn't show any codes or problems on the truck, but if you go through the dash to pull codes the only 1 I get is for the engine, its SPN 102 FMI 2. I have searched online and in my books and cannot find this code anywhere. If anybody can help it would be much appreciated to get this truck back to work.
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