Ok I have 2 other threads, originally I thought wire harness was the problem I repaired it all lights and service codes went out . What's happening is machine is stopping locks up like brake applied every 5-10 feet in first gear only both foward and reverse 2nd and third machine runs fine and only after machine warms up about 15 minutes after starting . When machine is first started it runs fine . I really appreciate all the help I got so far thanks in advance
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D6N stopping
- Thread starter KWhauling
- Start date
Dave Neubert
Senior Member
The R models had a electric switch in the brake pedal that would cause this
Nige
Senior Member
But wouldn't that stop it in all three gears in both directions and not just in 1st speed.?
It's only in 1st gear and only when warmed up
Dave Neubert
Senior Member
does it stop like drive you thru the windshield I had one that the harness to the transmission wore thru and it would engage in 2 gears at one time. it took putting it on the laptop and watching the shifting to find it
Yes but only when warmed up so you'd think harness would be any time and only when in first gear thanks
Nige
Senior Member
Talking about wire harnesses it might help if you knew the back story Dave.
https://www.heavyequipmentforums.com/threads/d6n-wire-harness.91986/
https://www.heavyequipmentforums.com/threads/d6n-how-to-read-fault-codes.92106/
Ok follow up had a mechanic come pressure test everything only thing he can find is when put in 1st gear the pressure drops from 370 down to 200 which the brake applies then all other pressure are good 2nd and third gear thanks were not sure what way to turn next short of pulling transmission
Nige
Senior Member
If the pressure drops the same way in both forward & reverse then the first speed clutch is on the point of failing and you will have no option but to pull the transmission.
It might pay to look at the pump while you are at it, and also replace the transmission cooler.
It might pay to look at the pump while you are at it, and also replace the transmission cooler.
We just went and changed clutch actuator valves around it still does it we're going to cut the filter apart yet and I guess the transmissions coming out
We cut filter apart nothing is there any possibility the control valve could be leaking we already switched clutch solenoids to rule out that thanks
BigWrench55
Senior Member
If I remember right. The brakes are supplied oil from the transmission pump and there is a priority valve that ensures that the brakes are supplied with oil. If you had a problem with your brakes passing oil then you would lose pressure to the first speed clutch. But I can’t remember what the symptom would be if the problem was reversed. I would check the operation of the priority valve. Don’t ask me where it is it’s been too long to remember. Nige will correct me if I’m wrong and steering you in a wrong direction.
Thanks we want to rule everything out possible before we pull that transmission we spent all day today troubleshooting that when we cut the filter apart there was nothing in the filter you would think if the clutches were failing there would have been broken pieces in the filter
Nige
Senior Member
Have you pulled the magnetic screen at the bottom of the transmission to look for debris yet.?
What colour is the oil.? Does it smell burned.?
What colour is the oil.? Does it smell burned.?
One dumb question why does machine operate fine when cold this has me confused you think it should do it always my mechanic said maybe when the oil gets warmer it gets thinner I want to fix it properly but just don't understand why it's acting the way it is thanks again really appreciate your help
We cut the filter on the back of machine nothing it looks new has a couple hundred hours on it oil looks new smells fine
Where is screen located ?
Nige
Senior Member
In the suction line for the transmission pump inside housing #8. To get at it will require taking down the belly guard. #10 is the magnet assembly, #11 is the screen.
Nige
Senior Member
Just make sure you drain the transmission oil before you pull the end cover off ............