YM1500 Loss of Power: Yanmar Tractors  -- Other Tractor Brands Discussion Forum and Review YM1500 Loss of Power: Yanmar Tractors -- Other Tractor Brands Discussion Forum

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 09-03-2005, 20:34 Post: 115899
Debbie



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 YM1500 Loss of Power

I am having problems with my YM1500 losing power while mowing after a short period of time. The RPM's will drop below 1000 and I will have to push in the clutch and idle the tractor. Sometimes it will pick back up after about 5 minutes above 2000 and sometimes it just goes dead. Any suggestions as to what I can do?






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 09-03-2005, 20:48 Post: 115900
Chief



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 YM1500 Loss of Power

When was the last time the fuel filter was replaced?






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 09-03-2005, 20:50 Post: 115901
Chief



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 YM1500 Loss of Power

Another area to check is the fuel tank vent. Many fuel tanks are vented through the filler tank cap. If this vent becomes clogged; it can cause a vaccum to develop inside the tank and periodically starve the fuel injection pump for fuel.






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 09-04-2005, 07:53 Post: 115911
Debbie



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 YM1500 Loss of Power

I changed the fuel filter about a month ago, the problem has gotten worse since then. A vent in the filler cap? Should I actually look at the filler cap for a vent? Would love to purchase a operators manual online (download) if anyone knows where I can get one.






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 09-04-2005, 09:12 Post: 115912
bmlekki



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 YM1500 Loss of Power

Does it also happen if you let it sit and idle high/low?

some of the fuel filter/bowls have a valve on the input. i would check that too. I've had this problem when it was closed over a little.






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 09-04-2005, 11:38 Post: 115914
Chief



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 YM1500 Loss of Power

Debbie,

I have a suspicion that when the fuel filter was changed, some residual air may have been trapped in the fuel system. To iliminate this possibility; I would suggest purging or bleeding the air from the fuel system by purging any potential air from between the fuel tank and the injector pump. I am not familiar with your particular tractor so look in your owner's manual or shop manual if you have one. Typically there is a air bleed screw or purge vent on or just at the pump that you can open and purge the fuel and air bubbles until you get fuel and NO air bubbles. The rest of the system can be purged by loosening the fuel lines at each fuel injector and turning the engine over until each line has purged any air bubbles out (ie: only fuel comes out) This is a bit messy but there is just no way around it if there is air trapped in the fuel injection system.






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 09-04-2005, 12:41 Post: 115917
Debbie



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 YM1500 Loss of Power

2ndHandLion,

You're right, it is extremely messy. It seems to work as long as the tractor is just at idle. However, when I go to operate it, it stalls as if it is starving for fuel. I have bled all the lines the best I know how.






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 09-04-2005, 12:49 Post: 115918
Debbie



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 YM1500 Loss of Power

bmlekki,

Yes it does, I was cutting grass yesterday and it started acting up. I got off of it and idled it up and raised to hood to check fuel lines. Before I could get any fuel lines loose, the tractor went dead, the RPM's would not increase.






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 09-04-2005, 12:59 Post: 115919
kwschumm



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 YM1500 Loss of Power

Did you just buy this tractor? I'm wondering if the fuel system is contaminated. Does this machine have a clear fuel bowl? Does it look clean or are there little particles floating around in it?






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 09-04-2005, 12:59 Post: 115920
Chief



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 YM1500 Loss of Power

Sounds like you have checked all the things that can cause this. Something that can cause this that is a bit of a long shot is in some fuel tanks, there is a pickup screen or "filter sock" (for lack of a better term) that can become clogged with debry or contaminants. You may want to check and see if this is the case. The other unlikely but possible option is that the fuel itself is bad. Where did you get the diesel fuel from?






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Discussion Boards > Active Subjects > Messages as Posted > Yanmar Tractors Forum

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