IH-484 Lossing RPMs: Tractor Engine Repair Rebuild  -- Tractor Maintenance Discussion Forum and Review IH-484 Lossing RPMs: Tractor Engine Repair Rebuild -- Tractor Maintenance Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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 09-06-2004, 21:53 Post: 95743
SE Lou



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 IH-484 Lossing RPMs

I was pulling a 6'brush hog Saturday when I lost power, my RPM's dropped from 1950 to 1200 and could not be coaxed back to PTO speed. Fuel, Oil & Air filters are new. Tractor ran two hours before problem, so it was not bad fuel. I checked to radiator it was not hot. No warning lights, no stack smoke.

I bought some injector cleaner and ran the tractor for 2 hours at 1,000 and 1,200 RPMs. Seemed to improve engines ability to get up to 1,500 RPM, but still 1,950 is still out of reach. Suspect a fuel line clog or injector pump problem. Still don't know why the problem came on so fast.

Any Ideas as to the cause or possible solutions ?






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 09-06-2004, 22:17 Post: 95746
Chief



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 IH-484 Lossing RPMs

First place I would take a look at is what is in the bottom of the fuel tank. Have you tried draining the tank and cleaning out any debry the may be restricting the fuel tank pickup screen or potentiall blocking the fuel line? While the tank is empty I would recommend blow out all of the fuel lines from the injector pump to the fuel tank. Are you sure the fuel tank is being properly vented so a vaccum does not build up over time? I bad fuel cap can cause this or a plugged tank vent. If it still has problems; it could be in the injection pump but it sure doesn't sound like it in this case.






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 09-07-2004, 06:17 Post: 95759
TomG

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 IH-484 Lossing RPMs

In addition to Chief's suggestions you might want to check the throttle and max no-load rpm adjustments. It's not clear to me if the rpm loss is under loaded as well as unloaded conditions.






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 09-07-2004, 07:35 Post: 95763
SE Lou



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 IH-484 Lossing RPMs

Thanks for your thoughts. Sounds like my next step is to drain and check the fuel tank and blow out the lines. It's a bear on the IH-4X4 series! It has a saddle shaped tank behind the seat with cross over lines and limited access to feeder fuel lines.

When I first lost power I checked the fuel cap to see if it was pulling a vacuum. It was not the problem. The power/RPM loss first occured under load, but when I released the PTO the problem persisted, so it does not appear to be tied to the PTO load.

The throttle seems to be working; I do have good access to the throttle lines, not sure how to adjust the max no-load rpm. Why would it suddenly be this far out of adjustment?






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 09-07-2004, 08:01 Post: 95766
Art White



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 IH-484 Lossing RPMs

You also need to check the crossover line from the two bottoms of the tank. That will tend to plug from time to time giving you the fuel loss problem.






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 09-10-2004, 18:13 Post: 96185
drh1983



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 IH-484 Lossing RPMs

Check your shut off solenoid or shut off cable for
proper function,if that checks out pull off the fuel
return hose at the injection pump during the low power
problem and check for good fuel flow into a bucket.
If flow is good,your injection pump could be the
cause for low power.If not,check for restriction in
the filters or fuel line,then check transfer pump.
Good luck






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 10-01-2005, 09:59 Post: 117200
Chief



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 IH-484 Lossing RPMs

SE Lou,

I would imagine that you have fixed the problem by now. Just curious as to what you found. One of the guys I let cut hay on the ranch owns an IH 484 & 784, and his brother owns an IH 464. Might be a good bit of info. to keep for future reference.






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

Thread 95743 Filter by Poster:
Art White 1 | Chief 2 | drh1983 1 | SE Lou 2 | TomG 1 |

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