Kinda depends on what engine you are using for the repower. Some engines have higer tork values than others and that is what I found gets you in trouble quicker. I have an 1850 Oliver with a 5.9L Cummins engine in it. We set the power to 145HP on the 540 PTO and ran it like that for about a year. As long as the RPM's were up and it was pulling it was fine, let the RPM's down to 1500 or so and lug the engine and the coupler chain would fly apart after a few hours (my grandfather grrrrr ). The Cummins engine has a HUGE amount of tork down low RPM,s and that can distroy a chain. After the chain comes apart three or four times it takes the transmission input shaft with it. Thats not an easy or cheap fix.... I let the power down to 135 on the PTO on the 1850 and have been running it ever since with only one chain failure, corse we are keeping the RPM's up more now too when pulling. You will find the coupler chain is the weak point in the drive line, if the chain and the input shaft can hold the power the rest of the rear end should be good to go. But I dont think you can hold more than 135Hp on the chain for a long time, at least not with Cummins tork agenst it. Now a Waukesha or Perkins engine my be different and you may be able to hold a little more HP but you will have to play with it and see. Now if you get a tractor like my 2150 with a trunion mount instead of a coupler chain, now that is a different story. :-)
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