7060

Have a customer with a 7060 that is complaining of low horse power.  Dyno'd @ 100 HP.  Check and re-set injectors, rebuilt pump, checked compression, set valves. Now it Dyno'd at 110 HP.  Found intake gasket to be blown, fixed that and now at 115 HP.  Have took intake hose off of turbo to eliminate inlet restriction and muffler off to eliminate exhaust restriction, fuel flow is fine.  Has 14lbs of boost under full load.  Turbo turns fine and has no play but that is what I am leaning to because of the low boost.  Also there is very little smoke at full load which is very abnormal for these tractors.  Anybody have any other suggestions.

I think it is supposed to be around 18 @ rated and max load, I agree about the smoke, but it has got me stumped and the turbo is about all that is left.  The tractor starts good and sounds good also.

have you checked the type of fuel they are using a friend of mine lost a lot of power in one of his tractors when he ran a tank of bio diesel through it.  He was pulling a 20 foot disk that he usually pulls in eighth gear at 3/4 throttle and had to drop a gear and run wide open to have enough power to run at the same speed. The only thing that changed was the type of fuel, when he filled it the next day he used regular diesel and had all of his power back.  I also noticed this with a diesel pickup, it had been filled with bio diesel and I though it felt gutless and when I stopped to refill it during the trip I used regular diesel and it came back to life, this was a couple years ago but I have not put bio diesel in anything since.

Bosch injectors, gonna hook it up to a 5 gallon bucket of our fuel tomorrow and re-check it, it also is one of them with the electric lift pump but everything checked out on it.

We had an electric lift pump that was pumping air in the fuel, like to have never found the problem - as stated, get a CLEAN supply of diesel and bypass all filters - go directly into the back of the pump for a short check.  If this fails to increase HP take the top of the pump and make sure the metering valve is contacting the smoke or torque screw -if equipped - also seeing a lot of gummed up metering valves that could be the problem.  I guess also a check of the transfer pump pressure would be in order as suppose these relief could stick open as well - but not likely. Worn blades or broke spings could hurt  though.

You have a fuel problem, is my guess.  I would say test your fuel pump on a test bench with the spec from an allis chalmers service manual, do not rely on the pump overhaul shops database as I have had two pumps set wrong by the same shop and when I took in my service manual it was quite clear why I had no power.  a 210 with 104 hp and a rebuilt pump set at 71 cc, book said 87 I think, boy did it change that tractor when the pump was set to what the service manual said.  It did not raise the boost pressure much, maybe two pounds.

I have seen this happen on an 8050, the pump had been replaced and timed correctly to the engine, the tractor had no power, but ran fine otherwise, it turned out the front dampner had moved so the timing of the pump showed correct, but in corilation to the crankshaft it was actully off.

Finally gave up  and put a different pump on it and it dyno'd perfect. so i am sending pump back to get re-checked, Thanks