Stalling an HST tractor

[slowzuki]

Stalled my HST Kubota many times no harm. Every stall is a low rpm stall. I'd rather is be at low fuelling than high fuelling as it will have reduced cylinder pressures/rod/crank loads.

 

[orezok]

No...a stall at a higher RPM doesn't reduce the engine speed to idle. The engine "dies" at the stall. Then it spins down (inertia) rapidly.

So you're saying that when the engine stalls at a high RPM (load exceeds power available), the engine stops fueling and firing at that point?

 

[RoyJackson]

So you're saying that when the engine stalls at a high RPM (load exceeds power available), the engine stops fueling and firing at that point?

Here you go:
http://en.wikipedia.org/wiki/Stall_(engine)

Google "Stalling an engine"...

 

[Chain Bender]

Definitely a broken crank

Kubota dealer called me Tuesday to let me know the crank was broken and had cause so much internal damage that Kubota is going to replace it rather than repair it.

Kubota is great when it comes to warranty work.:thumbsup:

Chain Bender

 

[orezok]

Here you go:
http://en.wikipedia.org/wiki/Stall_(engine)

Google "Stalling an engine"...

That has no relationship to what is being discussed here.

 

[RoyJackson]

That has no relationship to what is being discussed here.

Actually, it does...the effects of stalling an engine are the same regardless of the transmission type. That particular link was the first one I copied.
I guess I could have googled "stalling a tractor engine on a tractor with a hydrostatic transmission" but that one won't get too many pertaining links.

Do google "Stalling an engine" or words to that effect...see what you find.

 

[orezok]

Actually, it does...the effects of stalling an engine are the same regardless of the transmission type. That particular link was the first one I copied.
I guess I could have googled "stalling a tractor engine on a tractor with a hydrostatic transmission" but that one won't get too many pertaining links.

Do google "Stalling an engine" or words to that effect...see what you find.

Perhaps you missed the point. A stall occurs when load exceeds power available at any RPM thereby reducing the RPM to a point where combustion cannot be continued (0 RPM). At some point along that curve, the RPM will be at idle RPM and the engine will be fueling and producing power.

Doesn't matter much where the RPM's start, it will pass through idle range at some point.

 

[RoyJackson]

Perhaps you missed the point. A stall occurs when load exceeds power available at any RPM thereby reducing the RPM to a point where combustion cannot be continued (0 RPM). At some point along that curve, the RPM will be at idle RPM and the engine will be fueling and producing power.

Doesn't matter much where the RPM's start, it will pass through idle range at some point.

No, I didn't miss the point...of course it will pass through idle RPM for a fraction of a second, but that's just as the engine is spinning down. It's already stalled...the reciprocating and rotating components (crank, rods, pistons, cams, etc) just haven't come to a complete stop (again, due to inertia).
I'd written I've stalled trucks...and that was above idle RPM (just not enough above idle to keep running) and I didn't react fast enough to prevent or stop the stall.

 

[SPYDERLK]

No...a stall at a higher RPM doesn't reduce the engine speed to idle. The engine "dies" at the stall. Then it spins down (inertia) rapidly.

......:confused2:

 

[RoyJackson]

......:confused2:

Jeez, SpyderLK...you've never stalled a vehicle? Think about it...even at 2000 RPM (writing about automotive engines, not a tractor diesel) which is well above the typical idle speed, it doesn't slow the engine before stalling...it just flat out stops (caveat: the inertia of the components I noted previously).
If you have a manual transmissioned vehicle, try dumping the clutch sometime.