Dear all, lately I was in my field with TNF75A.
All of a sudden the transmission lamp started flashing and the tractor shifted to high automatically and moved in forward only.
It seems that all of a sudden it went crazy.
Now I am in hold of a circuit diagram and I am checking the solenoid Valves one by one, and by powering the forward solenoid manually I managed to drive the tractor out of the field.
My question is regarding the combination of solenoid valves the tractor has as I do not know clearly their function.
It has two , which are labelled as forward and reverse which I assume are the forward and reverse driving solenoids.
Another is the dump solenoid which seems to dump all the hydraulic pressure to off load the pump ( actually I do not know its main purpose)
Another is the HI-LO solenoid which I think shifts from LOW to HIGH range and versa, although when I applied power on this solenoid when in forward I saw no difference in speed.
The last valve which is present and I have no idea at all of its operation is the shuttle mode solenoid valve
. Can anybody explain what is the purpose of this solenoid please and at which instant it is suppose to operate please.
Thank you
All of a sudden the transmission lamp started flashing and the tractor shifted to high automatically and moved in forward only.
It seems that all of a sudden it went crazy.
Now I am in hold of a circuit diagram and I am checking the solenoid Valves one by one, and by powering the forward solenoid manually I managed to drive the tractor out of the field.
My question is regarding the combination of solenoid valves the tractor has as I do not know clearly their function.
It has two , which are labelled as forward and reverse which I assume are the forward and reverse driving solenoids.
Another is the dump solenoid which seems to dump all the hydraulic pressure to off load the pump ( actually I do not know its main purpose)
Another is the HI-LO solenoid which I think shifts from LOW to HIGH range and versa, although when I applied power on this solenoid when in forward I saw no difference in speed.
The last valve which is present and I have no idea at all of its operation is the shuttle mode solenoid valve
. Can anybody explain what is the purpose of this solenoid please and at which instant it is suppose to operate please. Thank you
