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I would not be afraid of a IH 1100 mower. This farm has run IH pitmanless mowers since the early 1970's. They can cut a lot of hay in a day. If you are worried about the wobble box, there are two areas to check. First is the bearing behind the pulley. Loosen the drive belt and see if there is any play. The second is the lower bearing. Remove the pin from the knife head. See if there is any up and down free play in the arm that drives the pin. One other area to check is the bar itself. The design is such that there is a weak spot where the bar meets up with the wobble box. If it is cracked it is only a matter of time till the bar snaps off, destroying the knife in the process. Last check a bar was over $1000 canadian. Our local Rowse dealer(Rowse bought the design to this mower and has corrected some of the design problems) says customers that installed Rowse inner shoes have never broken any bars. If you have a wobble box go bad call, Leo in Aberdeen South Dakota (605) 225 8069. He is a Rowse dealer and has a large business rebuilding wobble boxes. He carries all parts in stock and if he knows your box is coming he can usually turn it around in under a day. He used to(and still might) charge a flat fee for labour and whatever parts were needed, and I thought his flat fee was very reasonable. He rebuilt a box for me several years back and it is still going strong. We pull our mowers with JD 510 tractors. 3 cylinder diesel, 152 cu. in. and about 40 Hp. They are adequate. I don't know how these compare HP wise to your Allis. If you buy a pitmanless you will not be sorry. Good luck! John
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