5400 chopper

[kevin71]

Just bought a 5400 Chopper with a 531 engine. The Chopper had sat for 5 years, it has 3600 hours,we put new fuel, fuel filters, and air cleaners and took it to the field. The Chopper runs great until we get into heavy hay. Then it bogs down and sounds like a gas motor. Does anybody know where to start to solve my problems?

 

[M w J]

Does it smoke ? can you hear the turbo when you shut it off ? Maybe the govenor is sticky But if you can hear the turbo and you have smoke Then maybe injectors.

 

[wilamayb]

You may need to check your filters again already. This ultra low sulphur diesel will clog filters for the first few uses. It is a solvent cutting loose any residue in your tank and lines.

If you think it may be your injector pump gov. control you may be able to double dose some ULS fuel lubricant additive to get it loosened up. You can also add a substaintail amount of ATF to do the same thing. If your aim is to lube the pump it would not hurt to add 12 quarts to 30 gal. It may or may not help. It has helped some in the past.

I have not been around a forage harvester, but make sure you are getting adequate fuel flow from your supply pump. I assume it is electric on the tank, but it may be mechanical driven by the cam. It sounds to me that you are just lacking fuel flow.

Good luck!

 

[Canadian Ken]

I have a Fox Super D with a 4-71 Detroit that was also bogging down. It turned out my rubber fuel hose from tank to pump which operates on vaccum had a hole and was pulling in air. I replaced the line and I was back in business.

Ken

 

[buickanddeere]

Seen a NH self propelled forage harvestor with similar problems. The fuel tank bottom was covered and fuel lines full with bits of corn leaves.