Kubota Gr2020 stalling

[Carnate69]

I have a Kubota GR2020 (air cooled, gasoline version, it has 325 hours on it. New to me, and I'm new to the systems on this mower. When I turn the mower to full lock sitting or moving, the power steering (I think it’s the ps, could be the fuel pump?) makes a slight whine noise, is this normal?

The other problem is, whenever it's making this whining noise only when turning at full lock, and I keep the mower at full lock, the mower will die after a few seconds of driving in tight circles, engines shuts off, to restart I have to pull the choke to restart, almost like it's fuel was shut off from the engine not receiving enough fuel from the full lock turns? Is this the relief valve functioning incorrectly or malfunctioning or is this a fuel starvation issue? Fuel is new, fuel filter is new, fuel is in the fuel filter body whenever it dies, so it "Has" fuel. Carb is cleaned. Mower is clean overall but this one has me stumped.

I’m guessing a weak fuel pump under load anyone else have this problem?

 

[TheOldHokie]

I have a Kubota GR2020 (air cooled, gasoline version, it has 325 hours on it. New to me, and I'm new to the systems on this mower. When I turn the mower to full lock sitting or moving, the power steering (I think it’s the ps, could be the fuel pump?) makes a slight whine noise, is this normal?

The other problem is, whenever it's making this whining noise only when turning at full lock, and I keep the mower at full lock, the mower will die after a few seconds of driving in tight circles, engines shuts off, to restart I have to pull the choke to restart, almost like it's fuel was shut off from the engine not receiving enough fuel from the full lock turns? Is this the relief valve functioning incorrectly or malfunctioning or is this a fuel starvation issue? Fuel is new, fuel filter is new, fuel is in the fuel filter body whenever it dies, so it "Has" fuel. Carb is cleaned. Mower is clean overall but this one has me stumped.

I’m guessing a weak fuel pump under load anyone else have this problem?

I have no specific knowledge of that machine but I doubt this is fuel related.

Your tractor has hydrostatic power steering. When you hold the steering over at full lock the hydraulic system is maxing out (unloading though the PS pressure relief valve) trying to turn the wheels past lock. The whine is likely hydraulic in nature. Back off the wheel and the whine (and possibly the stalling) will likely stop.

Dan

 

[Carnate69]

I have no specific knowledge of that machine but I doubt this is fuel related.

Your tractor has hydrostatic power steering. When you hold the steering over at full lock the hydraulic system is maxing out (unloading though the PS pressure relief valve) trying to turn the wheels past lock. The whine is likely hydraulic in nature. Back off the wheel and the whine (and possibly the stalling) will likely stop.

Dan

Power steering was my first thought, something with the pressure relief valve or the fluid overheating or something? Is it putting too much load on the system and the mower is detecting this? The fuel pump on these is mechanically run by the exhaust gases, so couldn't it be wearing out and can't provide proper fuel at this higher engine load? I'm lost on this one.

Is it normal (I assume not) that the tractor would die under this scenario? I have no idea how the pressure relief valve works, but it seems really weird that the mower would die under this circumstance. That would mean no one could drive around a set of trees at full lock without the motor cutting out, that's not normal.

I'm literally only doing figure 8's or tight circles to make it die within 20-30 seconds, and the mower just cuts out. The problem started when mowing the grass - as you get to tighter and tighter turns to finish the job, the mower started stuttering, and dies, so I did more figure 8's at full lock and it does the same engine cut out thing over and over.

 

[TheOldHokie]

Power steering was my first thought, something with the pressure relief valve or the fluid overheating or something? Is it putting too much load on the system and the mower is detecting this? The fuel pump on these is mechanically run by the exhaust gases, so couldn't it be wearing out and can't provide proper fuel at this higher engine load? I'm lost on this one.

Is it normal (I assume not) that the tractor would die under this scenario? I have no idea how the pressure relief valve works, but it seems really weird that the mower would die under this circumstance. That would mean no one could drive around a set of trees at full lock without the motor cutting out, that's not normal.

I'm literally only doing figure 8's or tight circles to make it die within 20-30 seconds, and the mower just cuts out. The problem started when mowing the grass - as you get to tighter and tighter turns to finish the job, the mower started stuttering, and dies, so I did more figure 8's at full lock and it does the same engine cut out thing over and over.

Power steering was my first thought, something with the pressure relief valve or the fluid overheating or something? Is it putting too much load on the system and the mower is detecting this? The fuel pump on these is mechanically run by the exhaust gases, so couldn't it be wearing out and can't provide proper fuel at this higher engine load? I'm lost on this one.

Is it normal (I assume not) that the tractor would die under this scenario? I have no idea how the pressure relief valve works, but it seems really weird that the mower would die under this circumstance. That would mean no one could drive around a set of trees at full lock without the motor cutting out, that's not normal.

I'm literally only doing figure 8's or tight circles to make it die within 20-30 seconds, and the mower just cuts out. The problem started when mowing the grass - as you get to tighter and tighter turns to finish the job, the mower started stuttering, and dies, so I did more figure 8's at full lock and it does the same engine cut out thing over and over.

I would not think stalling is normal. It is also not normal to hold the steering at full lock for extended periods of time.

I have never seen a fuel pump run off exhaust gases. Are you sure its not electric?

EDIT: I see this tractor uses a Kohler small engine of some sort. Is the fuel pump perhaps vacuum operated?

I will add that when my my G2460 had stalling issues on side slopes it was related to safety switches.

Dan

 

[Russell King]

I would think that the shutdown is a safety switch operation

Does it die like the switch is turned off or starving for fuel?