mjncad
Super Member
This guy did.... LiveLeak.com - Idiot Tries To Navigate Tractor Down Stairs
(not my title by the way....)
I hope that dolt hasn't bred.
This guy did.... LiveLeak.com - Idiot Tries To Navigate Tractor Down Stairs
(not my title by the way....)
First off Im glad you got off the machine and didnt get hurt...With that said Im goingto go out on a limb here and say that given your explanation of what happened,my educated guess is that the machine may be slightly low on hydraulic oil,<sinp>
One of the things I experimented with was turning the key off on the hill as a emergency brake. Works OK. .relaqbr
After reading your post about a run away machine using hydraulics drive, I thought of the following things. If the machine is using a hydrostatic driven transmission, about the only thing I can think of is that the lever controlling the camplate came loose, or was jammed, forcing the camplate to maximum and increasing speed. The camplate in the hydro has a spring that keeps it in neutral until you push or pull the lever to go fwd or rev. The cable controlling that camplate could have jammed, and the accident caused it to become unstuck. .
You might never know what caused it if things are working correctly.
There is probably an emergency stop, which is used to kill the engine.
Thanks for the post J_J I got some useful info googling toro hydrostatic camplate problem. The unit seems to run the same as it did before the problem. I don't have a speedometer but I believe that it was actually going faster than "top speed" when I hopped off.relaqbr
After the accident, did the machine operate normally?
I had a similar situation with a stuck control cable, controlling a hydrostatic transmission. It caused max speed with no control.
I have a new cable on order now.
I hope that dolt hasn't bred.This guy did.... LiveLeak.com - Idiot Tries To Navigate Tractor Down Stairs
(not my title by the way....)
"I had a thought...which is rare enough in itself..." Oh I am sure NOTI know this is an older thread, but I had a thought...which is rare enough in itself...
<snip> What if at that same operating temperature, and a negative pressure (a vacuum) the volatiles bubble out making so when you reverse the swashplate, you don't really have bona fide fluid in the pump motor path to drive reverse direction forces.
Possible?
I know on a track motorcycle that runs really hot brakes that if you have one iota of water in your fluid it will boil and create an air bubble that will put you straight into a wall.
If the OP had old hydraulic fluid with contamination your theory could be right on. And running on hills would put more stress on it and make it heat up more.
It sounds to me as if you are running close to the limits of the machines on your drive (35 degrees is quite steep). I am not familiar with the machine in question but the manufactures maximum recommended angle will be based on twice the static tip angle.
As for how to tackle slopes safely<snip>...
I have had similar experences in the past but never actually lost the machine, the last one ws on a JD outfront rotary mower (1340?) which nearly ran out in heavy traffic.
He must mean a 35% grade. A car, even one that had enuf power, would need 4wd to climb 35 degree pavement if it were wet.It sounds to me as if you are running close to the limits of the machines on your drive (35 degrees is quite steep).