bds1984 1,500 #1 Posted December 24, 2015 So, as the title states, I have an early 520H that I've given a new lease on life with a 390-hour M18 engine from a Cub. The only issue I have with this is the PTO shaft is just big enough for the drive pulley and an accessory pulley. Since this engine only has bushings in place of ball bearings, it cannot accept a tradtional WH PTO. My question is, can I, or is it a good idea to machine a 1.125'' diameter extension to bolt onto the PTO shaft to allow me to put an electric clutch on it? 1 Share this post Link to post Share on other sites
BESTDOGEVER 218 #2 Posted December 24, 2015 I replaced my 418A engine with a m18 that I think was a replacement for a jd that I had used on a commercial powerwasher that application had considerable side stress from the pump and the generator if you have enough space to attach the clutch disk and sleeve I don't think that it really would harm the engine as the magnum series are commercial grade engines and the force of the pto only pushes against the clutch in a straight line. Share this post Link to post Share on other sites
pfrederi 18,707 #3 Posted December 24, 2015 (edited) Some M series came with thrust bearings You have to look up th spec number in the parts manuals to see. The sideways stresses are handled by two 1 inch long sleeve bushings. The straight line end loading is the issue and with out a thrust bearing there is only a small lip on one sleeve bushing to handle the loading. May work for awhile but probably not for long. Insert other media Edited December 24, 2015 by pfrederi Share this post Link to post Share on other sites
JAinVA 4,638 #4 Posted December 24, 2015 If your are talking about butting a 1.125" extension up to the existing shaft I would not do it.The bolt(3/8") if memory serves would be under a load it was not intended to take.If it got loose or broke you could be eating the clutch assembly.If you were sleeving a 1" shaft then I would do that.The horse could still do a lot of work without the PTO.JMHO,Luck,JAinVA Share this post Link to post Share on other sites
can whlvr 994 #5 Posted December 25, 2015 I agree with paul,it wont last long,remember the drive pulley will be constantly pulling towards the back of the motor,most of these type engines the crank slides into a pump,or generator,or a transmission 1 Share this post Link to post Share on other sites
bds1984 1,500 #6 Posted January 3, 2016 Well according to the interwebs and a parts manual, with a spec number of 24647, it should have a thrust bearing so this engine can handle a WH pto. Now to source out the bits to make that happen. Share this post Link to post Share on other sites
pfrederi 18,707 #7 Posted January 3, 2016 10 hours ago, bds1984 said: Well according to the interwebs and a parts manual, with a spec number of 24647, it should have a thrust bearing so this engine can handle a WH pto. Now to source out the bits to make that happen. I am not so sure about that. From my read Spec 24647 is crankcase variant #162 Thrust bearings are only in variants 118,120,175,197,206 1 Share this post Link to post Share on other sites
bds1984 1,500 #8 Posted January 3, 2016 Well I am glad that you pointed that out. The reference sheets I found made no mention of specific parts breakdown like that. Share this post Link to post Share on other sites
pfrederi 18,707 #9 Posted January 3, 2016 3 minutes ago, bds1984 said: Well I am glad that you pointed that out. The reference sheets I found made no mention of specific parts breakdown like that. Sorry...but you can see that without the thrust bearing the only thing to deal with the end loading (inward pressure ot the PTO) is the tiny flange on the sleeve bearing #23 Share this post Link to post Share on other sites
bds1984 1,500 #10 Posted January 3, 2016 Oh I completely agree and that was my thoughts from the beginning of this project. Share this post Link to post Share on other sites
