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With the time it takes to build up the air brake pressure, move the other rigs out of the way to get it pulled out of its parking spot it usually gets a warm up period before I take it out. I had asked the crew at Peterson cat to do a filter and fluid change on the transmission but they just...

Well after some looking at the cables, linkages, and whatnot I didn't see anything that stood out as obvious to being the culprit for the hard downshift into first. I even had the local Peterson cat heavy equipment repair shop take a look at it. They said with the exception of maybe one of the...

Checking out Ccc cable, I see they have modulator cables for the mt600, I'm thinking that the transmission I have is the mt654? As I'm not familiar with allison transmissions. I can be completely wrong, does the mt600 cable modulator they have work on mine or do I need one specific to the mt654...

So then getting the replacement Ccc cable should help? Or would I need to replace the spring at the cable base as well if that's possible.

Okay, I'll use ATF in it when I do the change. And go with a Ccc cable, but when I say it hard shifts, it's more like a slam. I have thought that something is going to break or split, as it's just started to happen unlike any downshift before. I half expected to see the tailshaft come off the...

Air pressure always remains fairly consistent at around 110-120psi. I think I may have misdiagnosed what is going on. As today I drove it a few miles down the road to get a load of dirt and when I pulled into the quarry yard I wasn't even touching the brake pedal and noticed when the...

I am not hearing the two clicks at all. But will definitely check again to verify that. The truck has only sat for a couple weeks of no use, and I have been driving it several times before letting it sit for those two weeks. I'll get a temp gun today and get a reading on it to see which one is...

Thank you very much for the info, I will definitely check it out. I am sure there is a strong possibility that I could have blown the fuse when I shut it down incorrectly. At least I am hoping that is the case.

I noticed the abs dash light that's normally on is not lit up anymore. The brakes are grabbing really hard at the last part of braking. Any thoughts on how to correct this or get the pcb box to communicate with the system? Any thoughts or advice would be greatly appreciated. Thanks.

Finally got the m939 running and driving again, then today when we made a run to the recycling center the truck started a new issue. When slowing down while braking the truck feels like it has the rear brakes are coming on strong and grabbing. It only does it the last part of braking when coming...