4300 fan blades shredding coolant hoses

   / 4300 fan blades shredding coolant hoses #1  

tippsand

New member
Joined
Aug 25, 2019
Messages
2
Tractor
x740, 4300HST
Hey guys,

I've had this tractor for a few years, and it's got about 1000 hrs on it (250 from me). Just recently replaced both rubber coolant hoses leading to the radiator because they had ruptured. Turns out they ruptured because the fan blades were abrading them, bit by bit.

I think there's a problem with the steering that causes the entire radiator assembly (rad, fan, shroud / cowl) to push upwards when the wheel is turned all the way to either side. When I crank the wheel, the engine starts to sound bogged down, and when I look under the hood with the wheel cranked, I see the fan blades chipping away at the coolant hoses. Also, the plastic of the hood near the hood latch and fuel fill areas has also been shattered by what appeared at the time to be some random impact from underneath the hood. When it happened, I chalked it up to a tree branch, but I believe it was the radiator shifting and cracking the hood latch mount.

The fan blades don't really seem to be covered by the cowl / shroud that extends towards the rear of the tractor. This cowl looks like it attaches to the rear of the radiator, and it looks like the fan should be inside it, or at least most of the way inside it. The blades themselves are covered in melted rubber from the hoses, and my brand new hoses have a groove 0.5mm deep from the blades.

Something ain't right. Any idea what to start checking, or whether anyone's had this happen and how to fix it?

Thanks!
 
   / 4300 fan blades shredding coolant hoses #2  
The battery is up there and the tractor is about 20 years old. Check for corrosion damage from battery acid near the radiator mounts. The original battery has the vents plumbed below the area with a hose. Cheaper replacement batteries do not have the provision to do so, and then they become more corrosive to that area.
 
   / 4300 fan blades shredding coolant hoses #3  
Agree with xskier
I'd start by removing the radiator and checking all the mounts to find the cause.

I will look over my radiator area on my 4300 to see if anything similar is happening. It's a '98 and a thousand hours. Battery has the vent hose..
 
   / 4300 fan blades shredding coolant hoses #5  
The engine bogging is simply the hydraulics going into "relief" as you hold the steering wheel and the axle is at full lock.
 
   / 4300 fan blades shredding coolant hoses
  • Thread Starter
#6  
Thanks to everyone who responded. I'll try to get it indoors and tear into it this weekend.
 

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