Yes, parts are available for the models of M37 series PTO's. There were two types used on the US versions. The M37 used a single to the front output type, while maintenance type series used a dual output type. They are identical except for the main output shaft, and the rear output bearing retainer with the shift lever attachment. They used identical bearings and seals. I am currently rebuilding two units, one is the standard and the other is the dual putput. The dual output PTO was very badly rusted and required all new gears and bearings and seals. The shift shaft had rusted in two and the output is badly pitted. I've turned and pressed on my own seal sleeves and am turining two shift shafts for both units from 304 stainless bars. A lot of work but they are in short supply and it gives me a good feeling to bring something back that was that far gone to a serviceable condition. AB Linn has a lot of parts as well as Vintage Power Wagons (VPW) as mentioned above. Memphis Equipment may have a number of parts. One word of caution, on reinstalling the PTO, care must be taken to make sure you have the correct backlash on the cluster and PTO drive gears, this can tear up a transmission pretty quick if you don't get it fairly close. Cones and cups are numbers 09195, 09062, 2631, and 2691. I bought new double lip viton seals from a local bearing house for 4 and 6 dollars apiece. I was patient and found good deals on new bearings and cups on eBay. Good luck.
Regards,
M376X6
