Need a little ag help. McCormick CX105 w/4.0L Perkins no power and loping

[BigPapa]

I need a little ag help. I have a friend with a McCormick CX105. I think it's a 2003 with the 4.0L Perkins Tier 1 emissions.

He has been doing some pretty heavy bush hogging and after several hours it lost power and started loping at idle. He removed the fuel filter and found nothing there, put it back on and it started it again after a short time. He put a new filter on it and it did the same thing. I suspect trash or algae in his fuel clogging the pickup tube in the tank. It's not cold enough here yet for the fuel to gel. Anybody have any experience with this?

 

[jhenderson]

Loosing power under load sugjests fuel related problems. I'd try bypassing the fuel tank and supply the injection pump with an alternate fuel supply. A 2 gal can and an electric pump independent of the tractor could short cut a lot of trouble shooting.

 

[mwilson]

Any bush hogging I have done is always dusty and nasty with a ton of debris floating around. Air cleaner element????

 

[jgillott]

Any bush hogging I have done is always dusty and nasty with a ton of debris floating around. Air cleaner element????

My 5303 Deere acts like a big vacuum cleaner when running the brush hog, especially when it is very dry out. It has a dual stage air filter and the pre-filter has gotten to the point of completely clogged. I've never had a lope from it but I've definitely seen it loose power when plugged.

 

[BigPapa]

Forgot to mention they've also replaced the air filter.

 

[fest3er]

Fuel, air and compression. With fresh air filter, air shouldn't be the problem. Doesn't sound like compression is a problem. That leaves fuel. Hole in fuel line or loose supply fitting that allows air in? Do the various pumps produce enough pressure at high flow rates? Or fuel control; are there any sensors that can cause reduced fueling?

 

[TFucili]

I used to see rotten/algae laden fuel quite a bit when I was in the tractor business, especially when people who are not heavy users put in a skid-tank that gets big temperature fluctuations. As mentioned, I would be looking into the fuel tank/pickup first. Also, make sure there is not an inlet screen upstream from the air filter housing that was missed.

 

[BigPapa]

I talked to him last night. He got a deal on 1K gallons of diesel, THREE YEARS AGO, and he's down to the last 200 gallons. I'm betting on the algae.......

 

[Wayne M.]

I talked to him last night. He got a deal on 1K gallons of diesel, THREE YEARS AGO, and he's down to the last 200 gallons. I'm betting on the algae.......

Bingo. In my marine day's I experienced a lot of this. The Racors were hourglassed and looked like they came out of a swamp weighing 10 lb.