Tracking problems Yanmar vio 75

[garyrs200]

I have a yanmar vio 75 year 2004 with 5000 hrs on it. I have owned it for 7 years with no problems. It has had very low usage in the last few years. The engine runs perfect with plenty of power to main arm, dipper arm, bucket crowd, blade and slewing.It has recently developed a problem with the right hand track motor, it wont track forwards unless I feed a bit off the left hand track lever at the same time as I feed the right lever and then its in fast track mode with no pushing power . If I track it in reverse it all works ok with plenty of power and goes in and out of normal speed and fasttrack speed. The right hand motor is feed off pump1 and the left hand motor is feed off pump 2.the fast track pedal / switch on the floor that controls the solenoid all works ok as does the solenoid. I don't think its the pump 1 as it works ok in reverse. Anybody have an idea whats wrong with it.I suspect its the track motor ?. Thanks Gary

[v8druid]

I have a yanmar vio 75 year 2004 with 5000 hrs on it. I have owned it for 7 years with no problems. It has had very low usage in the last few years. The engine runs perfect with plenty of power to main arm, dipper arm, bucket crowd, blade and slewing.It has recently developed a problem with the right hand track motor, it wont track forwards unless I feed a bit off the left hand track lever at the same time as I feed the right lever and then its in fast track mode with no pushing power . If I track it in reverse it all works ok with plenty of power and goes in and out of normal speed and fasttrack speed. The right hand motor is feed off pump1 and the left hand motor is feed off pump 2.the fast track pedal / switch on the floor that controls the solenoid all works ok as does the solenoid. I don't think its the pump 1 as it works ok in reverse. Anybody have an idea whats wrong with it.I suspect its the track motor ?. Thanks Gary

couple of galleries cross flowing in the rotary coupling ... oils seal/O ring split between two, I'd guess, from standing about

[Muz]

I'd go with orbital valve too, since, if its the same bank/feed that powers that motor, it will use a different journal in the valve when the flow is reversed, that said, it could just be a dodgy valve slice .. or some shit in it causing the same problem too, possibly a bit of rubber crumb if she been sitting a while

[garyrs200]

Thanks for your replies, I will bypass it to try first before stripping

[britches40353]

Garyrs200 Did you ever find out the problem Mine is doing the same thing, It would be so helpful if you could tell me

[britches40353]

Mus where would the orbital valve be located and do you have a part number ty

[Muz]

Its the valve below your seat that distributes oil to the track motors and dozrer but you should start your own thread for further info

[v8druid]

Mus where would the orbital valve be located and do you have a part number ty

orbital is also known as a rotary coupling .... it's in the centre of the rotation of the machine ... some examples
https://www.dsti.com/landing/hydraul...IaAq_-EALw_wcB