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Cub Cadet 7305 loses power after 15 minutes

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chashm
Join Date: Oct 2013
Posts: 67 United States
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2013-10-03          188066


Hi, I have a CC 7305 with about 750 hrs on it. Up until recently, it ran great.
Now, after about 15 minutes warm-up (during which it works normally) it loses power and eventually stalls. it runs rough for a minute or two, the RPMs drop and then quits. Once it's to the rough-running stage, trying to throttle it up doesn't do anything.
I've:
- replaced fuel filter, Old one was clean, just a little sediment in bowl. No water or algae in sight.
- replaced fuel pump (see below)
- checked air intake for blocks
- checked wiring to fuel pump
I got started thinking this was some form of fuel delivery problem because the rough running sounds just like when I forget to turn on the fuel shutoff valve before starting.
When it's cold, turning it on and cracking the bleed screw on the injector pump causes the fuel to really squirt out (i.e. plenty of pressure). Once it's warmed up it's more of a dribble and if I crack the bleed screw while it's running rough it'll run rougher. If I close it quickly enough it won't stall. So I think maybe it's starved for fuel.
There's a Mitsubishi tractor with this motor (and injector pump) that I found a manual online for. It appears that it has a gravity-feed fuel system - no fuel pump - so there shouldn't be a need for much input pressure at the injector pump.
I figured that the fuel pump seized up somehow when it got warm, so I put in a new one, but the behavior hasn't changed.
No obvious evidence of oil or fuel in the antifreeze, or colored smoke once it's warmed up a bit, so I don't think it's a warped head kind of leak.

Any ideas?


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____________________________________________________________________________________
Cub Cadet 7305 loses power after 15 minutes

View my Photos
chashm
Join Date: Oct 2013
Posts: 67 United States
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2013-10-07          188089


Well, got around to draining the tank, flushing the lines and putting in new diesel. It runs great again! ....

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