New PT425 and Trip

BobRip · Aug 30, 2017

http://www.tractorbynet.com/forums/...-noise.html?highlight=Improving+parking+brake
Look at the above link. There is a picture of my cam.

bol4fun · Sep 28, 2017

Slowly putting on the hours and getting much more comfortable with the machine. I did call Terry about a issue with curl UP on the joy stick not working right but since I didn't have the machine close, I told him I would call him back. He said something about making an adjustment under the dash but I couldn't see where unless I took some things apart. I noticed it when I had the brush cutter on ( I couldn't seem to get the front of it to lift up) then looking under the joystick, I could see where the other 3 movements engaged immediately but the curl UP one, kind of made a psssst sound and did nothing). A few days later I was filling pot holes with gravel with small bucket and it seemed to work fine but not quite sure if it curls as much as it is suppose to....... soooooo, either it didn't work correctly with brush cutter because of its weight so far forward or ?????. Any ideas.......

marrt · Sep 29, 2017

The curl should have a lot of power. Enough, for example, to lift the back of the tractor off the ground in some situations. It may be an adjustment. Or you may have a bad o-ring or other problem in the joy stick control.

Put a bucket on and go lift something very heavy using just the curl (i.e., curl the bucket back to lift the object 3 or 4 inches or until the back of the tractor starts to come off the ground). In general, the curl will lift a heavy object this way when the actual lift arms will not due to the greater leverage. At least in my experience.

MossRoad · Sep 29, 2017

Also, the steering has priority on that circuit. If you have the steering wheel cocked all the way to one side, its possible to disable the lift/lower and dump/curl functions. If you notice it again, see of the steering is cocked all the way to one side. Back off the wheel just a tad and FEL functions should return.

Hope its something that easy.

marrt · Sep 30, 2017

MossRoad said:
Also, the steering has priority on that circuit. If you have the steering wheel cocked all the way to one side, its possible to disable the lift/lower and dump/curl functions. If you notice it again, see of the steering is cocked all the way to one side. Back off the wheel just a tad and FEL functions should return.

Hope its something that easy.

Good point. Forgot about that. This confused me too (no lift or curl while turning the steering wheel) when I first bought the tractor.

MossRoad · Sep 30, 2017

I only have issues with the FEL functions at or near full lock on steering to one side or the other. But it definitely does happen.

MossRoad · Sep 30, 2017

It because the AUX PTO pump supplies the steering valve first, then the power beyond port on the steering valve feeds the three spool valve under the dash that operates the up/down, dump/curl, and aux PTO (quick attach), before dumping back to the tank.

bol4fun · Oct 1, 2017

Since we are talking right now about power.... if you have pto attachment on with pto on...... and if you are stuck, would it help to turn off pto so wheels are getting all the power. Does it work that way? I know that less speed is better traction..... but thought it might somehow help ... torque ??????
Also, what adjustments do you think Terry was talking about under the joystick (box?) to make the left curl Up work better.

BobRip · Oct 1, 2017

The PTO is on a separate pump, but it does take engine power to run the PTO so turning off the PTO should give you more horsepower for the wheel motors.

MossRoad · Oct 1, 2017

If you are running a hydraulically powered implement and you get stuck, turning off the powered implement would be the first thing I'd do just for the safety aspect.

By turning off the implement, you won't gain any hydraulic flow to the wheel motors, as the PTO pump is separate from the tram pump. However, you will get some more engine power available for the tram pump to use.

HOWEVER.... the main PTO pump is always pumping, wether you have it turned OFF or ON, it is ALWAYS PUMPING! The main PTO switch on the dash is not an ON/OFF switch for the pump; it's an ON/OFF switch for an electric diverted valve. When OFF, it diverts the output of the main PTO pump directly back to the tank. When ON, it diverts the output of the main PTO pump directly to one of the main PTO quick connects out on the FEL arms, through the implement, and then back to the tank through the other main PTO quick connect on the FEL arms.

So, if you're stuck, and leave the PTO pump ON with an implement running, the implement will consume some engine power that could be used by the tram pump if it were turned off. Even if the implement is just free spinning in space, its consuming engine power because of air drag and inefficiencies in the hydraulic motor on the implement, drag on the fluid in the fittings and hoses, etc...

Does that make sense?