L4740 stalled this afternoon

[Husaberger]

Tractor has about 1500 hours and has always been reliable
Was running it all day today and noticed engine was not as responsive as normal this afternoon
Half an hour later it stalled
I could restart it but it would not rev normally, stumble, and then stall
Cleaned air filter and fuel filter- both looked ok
Noticed engine would run better with air vent cock on fuel injection pump open
What should I be checking next?

 

[5030]

Try replacing the spin on fuel filter located behind the sediment bowl at the rear of the engine against the firewall. If that don't do it, check the fuel cap and make sure it's passing air and if none of that gets it, you have a pinhole in the fuel line between the spin on filter and the tank outlet.

 

[jeff9366]

Did you inadvertently turn off STALL GUARD?

Is the PARKING BRAKE engaged?

When was the FUEL in the tank purchased?

 

[Husaberger]

Try replacing the spin on fuel filter located behind the sediment bowl at the rear of the engine against the firewall. If that don't do it, check the fuel cap and make sure it's passing air and if none of that gets it, you have a pinhole in the fuel line between the spin on filter and the tank outlet.

Did not know there is a filter back there. Do you have any more info on it?

 

[Husaberger]

Did you inadvertently turn off STALL GUARD?

Is the PARKING BRAKE engaged?

When was the FUEL in the tank purchased?

I appreciate the questions Jeff
Answers:
1. Did not. In fact cycled through the options and no change
2. Nope. And wished it worked that well but stalls even in neutral
3. Within the past two months

 

[seville009]

Did not know there is a filter back there. Do you have any more info on it?

Check the fuel cap like 5030 suggested.....hopefully it will be that simple

 

[Husaberger]

Follow-up:
Removed the fuel cap- Still ran rough
Looked in tank- everything looked clean
Removed line from tank at fuel filter- it only trickled
I blew air back into tank and then it flowed well
Removed all fuel from tank and diesel look clean
Not sure where obstruction was but runs fine now
Will probably have to do a better cleaning of tank at some point down the road

 

[seville009]

Glad you got it running smooth again.

Never know - may have been a little bit of gunk that was just big enough to cause the problems

 

[rScotty]

Follow-up:
Removed the fuel cap- Still ran rough
Looked in tank- everything looked clean
Removed line from tank at fuel filter- it only trickled
I blew air back into tank and then it flowed well
Removed all fuel from tank and diesel look clean
Not sure where obstruction was but runs fine now
Will probably have to do a better cleaning of tank at some point down the road

If there was enough crud in the line to block flow to the filter, would the filter be clogged as well?
rScotty

 

[amhicks21]

I actually had this happen with a low hour l3200 a few months ago. I think all it would take is a bug, leaf or other little piece of debris to fall in the tank while fueling to cause the fuel line to plug.

 

[5030]

Kubota sells a really nice drop into the filler neck plastic mesh removable filter you can buy from your dealer than eliminates any trash in the tank. I have one in each of my filler necks. Think the are around 6 bucks each.

 

[5030]

Did not know there is a filter back there. Do you have any more info on it?

Get yourself an owners manual it shows that in there. If you already have one, I suggest you read it.

You can also purchase the WSM for about 250 bucks from your dealer or, download a pdf copy from www.kubotabooks.com if it's listed. Not sure it is.

 

[ptsg]

Kubota sells a really nice drop into the filler neck plastic mesh removable filter you can buy from your dealer than eliminates any trash in the tank. I have one in each of my filler necks. Think the are around 6 bucks each.

Yeah, they used to include that on the older Kubota tractors. Apparently it was too expensive to for them to keep including a screen that costs them cents, but somehow they price of their tractors keep increasing even though they keep removing more stuff and turning everything into an option.

 

[jonsstihl]

i also have a l4740 and I have read the owners manual and I have the shop manual for it. I am not aware of any spin on fuel filter on this tractor. I may have missed it but the only fuel filter I know of is the one in the sediment bowl. What do you mean by spin on filter? I"m thinking a canister filter like an engine oil filter. I have not noticed one but will take a look around my engine.

 

[5030]

Just looked and it may not which is kind of unusual for Kubota.

 

[5030]

Yeah, they used to include that on the older Kubota tractors. Apparently it was too expensive to for them to keep including a screen that costs them cents, but somehow they price of their tractors keep increasing even though they keep removing more stuff and turning everything into an option.

Yes, they did, no, not now. I don't believe any make or model of tractor has went down in cost, least none that I've seen.

 

[ptsg]

Yes, they did, no, not now. I don't believe any make or model of tractor has went down in cost, least none that I've seen.

Specially in the last 2 years... My tractor costs about $4000 more than the day I bought it in 2017.

 

[5030]

Interesting how inflation works, isn't it? The value increases but the value of the currency decreases so in reality, you pay more but don't get anymore. Like my 97 Ford diesel. It's worth presently about 3 grand less than I paid for it new but if I sold it, it would cost me 80 to replace it, so I keep it. Not about to spend 80 for a truck that in reality is worth maybe 20.

 

[Smokeydog]

Kubota sells a really nice drop into the filler neck plastic mesh removable filter you can buy from your dealer than eliminates any trash in the tank. I have one in each of my filler necks. Think the are around 6 bucks each.

My old Kubotas had those filler screens. Good for large crud. Not available for my newer tractors. Just checked Messicks online parts. Sad because tractors are used in dirty environments.

My WWII, 1944 WC63 truck had a pull out screened trough on the filler neck where you could use your helmet to 55 gallon drum to gas up.

 

[Husaberger]

Kubota sells a really nice drop into the filler neck plastic mesh removable filter you can buy from your dealer than eliminates any trash in the tank. I have one in each of my filler necks. Think the are around 6 bucks each.

Good suggestion