75XT horsepower change

[davidchamness]

I just purchased a 1999 Case 75XT. In several places it notes the 1998-2000 models before SN JAF0318922 only have 57hp and after it is 69hp. One mechanic told me they only raised the rpm to get the higher hp and maybe modified the pump a little. Is this true, I did see the spec sheet for the early model was rated at 2000 rpm and the later model at 2200. Is there a way for me increase the rpm on my machine to get better hp without causing damage or excessive wear to the unit. I just don't want to be underpowered on an otherwise pretty stout machine. Any help would be greatly appreciated. Dave

 

[skidsteer.ca]

Does it seem short on power, or is this just because you want it. I take it they are the same engine in both cases?
Generally power can be increased just by setting the injection pump fuel rate higher, the rpm should have less to do with the increase then the fuel. Any increase in engine power will shorten life some. Why the original design called for less hp on yours and more on the later models only the engineers would know.
My advise would be leave it alone if it it works for what you need it for. Setting a engine hp higher will test the limits of every other component in the machine. While it can be interesting to improve things, it can often be expensive.
This coming from a guy who has a 13.07 second vintage Mustang. The pursuit of higher hp and lower elapse times generally comes with a price attached.
Ken

 

[davidchamness]

Does it seem short on power, or is this just because you want it. I take it they are the same engine in both cases?
Generally power can be increased just by setting the injection pump fuel rate higher, the rpm should have less to do with the increase then the fuel. Any increase in engine power will shorten life some. Why the original design called for less hp on yours and more on the later models only the engineers would know.
My advise would be leave it alone if it it works for what you need it for. Setting a engine hp higher will test the limits of every other component in the machine. While it can be interesting to improve things, it can often be expensive.
This coming from a guy who has a 13.07 second vintage Mustang. The pursuit of higher hp and lower elapse times generally comes with a price attached.
Ken

Yes they are the same engine, the Cummins 4-390 engine. I think when it came out the first round of buyers were expecting a stronger machine (engine hp) than the 1845C to compliment the increase in lift capability and weight. I have not had a chance to put it to the test yet, but I think your suggestion is best. I will wait to see if if becomes an issue and determine if the need outweighs the risks. Thank you for your insight. Dave

 

[skidsteer.ca]

Yes they are the same engine, the Cummins 4-390 engine. I think when it came out the first round of buyers were expecting a stronger machine (engine hp) than the 1845C to compliment the increase in lift capability and weight. I have not had a chance to put it to the test yet, but I think your suggestion is best. I will wait to see if if becomes an issue and determine if the need outweighs the risks. Thank you for your insight. Dave

Those engines where available up to @ 125 hp with a turbo I believe.
A Cummins mechanic could likely confirm what is reasonable to adjust it too.
Then it would also be a matter of if the machine had any components lest strong then the newer models. Also sometimes the hydraulic pumps volume or pressure was increased on newer model putting a larger draw on the engine power so the engine is set up to compensate.
Still all things considered the joy of extra hp goes pretty quick if something breaks. It is always best if the engine the engine backs off first.
You may well find other owners that went down that path with no ill effects though.
Ken