540 to 1000 rpm pto on a 1850

super99

Well-known Member
I bought a stalk cutter with 1000rpm pto. 1850 #2 has a 2 speed pto. I bought a used 1000rpm shaft and a new bearing. I followed the direction in the operators manual and changed it over to 1000rpm this evening. When I try to engage the pto, I get a grinding sound and no shaft movement. When I shifted it, I screwed the bolt in and wiggled the shaft to make sure the shift lever was in the right place. The shifter has about 1/8th " showing outside the housing. Now I'm wondering if I have the right 1000 rpm shaft? I didn't think to hold the 2 shafts side by side to compare lengths. Did I do something wrong or are there different length shafts for different tractors? Any ideas? Thanks, Chris
 
Mine does exactly the same thing. Maybe somebody will help both of us. I even asked the service manager at the dealer and he didn't know what was going on.
 
First the 1000 shaft will be an inch or so shorter on the inside end. This is so it does not push the cam inside the unit that prevents you from installing the 540 shaft when the shifter is in the 1000 position. Most of them when the shifter is in the 1000 position the shifter shaft is flush or a little in the housing. Pull your lock bolt out and make sure you can see the detent groove in the shifter to be certain it is all the way in gear.
 
Our 1855 will do that from time to time, just means you don't have the shifter pulled all the way.

Our 18 came with a lift eye welded to the shifter rail. Helps get a pry bar on it off it wants to stick.

Donovan from Wisconsin
 
Mine won't shift in unless I go way in past the groove. If you screw that tapered bolt in though,it goes in to the groove and pulls it back out. I tried a different bolt with a flat end,but then it grinds.
What about that cam you mention? Can you go in to more detail on that? Is there a chance that it might be stuck?
 
Chris & Randy: This is not big PTO country and we had very few users of the 1000 RPM units. But one thing we found that helped was release the PTO brake. You want to be able to install the shaft in just far enough to catch the gear and then rotate the shaft as you move the shifter. You are trying to engage the gear set and you don't have the teeth on the shift collar and the gear lined up. So you need to turn the shaft till the shift collar slide on the other gear. Probably at least 30% of the farmers that tried to shift them the first time screwed up the cam so we would need to remove the unit and grind the rough edges off of the cam. Also Chris you will find that chopper will vibrate more than a 540 shaft due to the theory of non uniform velocity. J.
 
Got it working now. As John said, I had to put the shaft in and turn it a little to make the splines line up. Works good, but I did notice it seemed to vibrate a lot more than I remember 540 cutters did. I started mowing rye stubble grown up in weeds as tall as the hood on the 1850, yea, I should have mowed it a month ago. The chopper is a Lundell flail chopper and the left side wasn't cutting as good as the right side. I'll check the belt tomorrow after work for tightness. In 3rd, the left side didn't cut much but the right side did. Slowed down to 2nd direct and it mowed well unless the weeds were really thick. Thanks for the help, Chris
 
That is because the U-joints have half the time to do their work. If you can reduce the driveline angle it will help. J.
 

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