Dave Downs Posted May 14 Share Posted May 14 Replacing a pump on neighbors vineyard sprayer. The shafts on the pump and driveshaft are 3/4” dia with ‘flats’ on them. The coupling is 3-1/4” long and has 4 set screws that go on the ‘flats’. 2 of them are corroded so badly that the hex sockets stripped when I tried to turn them out. I was able to remove the pump with BFH….but now I need a coupler since those socket head set screws are not coming out. Problem is I don’t know what to call it when looking for a new one. I can find couplers for keyed shafts, hex shafts and even 2 piece compression couplers but so far none for flat shafts. Any ideas on what to call it - it seems to me to be the most basic shaft coupler there is but I can’t find one. Quote Link to comment Share on other sites More sharing options...
nate Posted May 14 Share Posted May 14 Rigid shaft coupling Quote Link to comment Share on other sites More sharing options...
Paystar5000 Posted May 14 Share Posted May 14 McMaster carr has a good selection of those. The ones I have gotten are split but I’m pretty sure they had those ones also Quote Link to comment Share on other sites More sharing options...
TN Hillbilly Posted May 14 Share Posted May 14 I would search "hypro pump coupler" Quote Link to comment Share on other sites More sharing options...
E160BHM Posted May 14 Share Posted May 14 Here is page from a Sprayer Specialties catalog. Looks like the Hypro roller pumps are mostly 5/8” or 15/16” diameter. If so, the top line, 1320-0015 might work. The prices shown are usually discounted. Or have a machine shop make one. Brian Quote Link to comment Share on other sites More sharing options...
nomorejohndeere Posted May 14 Share Posted May 14 drill and tap reuse 3 Quote Link to comment Share on other sites More sharing options...
Dave Downs Posted May 14 Author Share Posted May 14 51 minutes ago, nomorejohndeere said: drill and tap reuse Can't get the coupler off the pump shaft - yes I used heat..... Quote Link to comment Share on other sites More sharing options...
nomorejohndeere Posted May 14 Share Posted May 14 since your replacing the pump cut the shaft at the bottom of the coupler and pound it out 2 Quote Link to comment Share on other sites More sharing options...
yellowrosefarm Posted May 14 Share Posted May 14 https://www.sprayerdepot.com/ This has been my go to place for all things sprayer pump related for about 25 years. Not sure about your specific coupler, but it wouldn't hurt to call and ask. Quote Link to comment Share on other sites More sharing options...
stronger800 Posted May 15 Share Posted May 15 Looks like a piece of pipe with four tapped holes in it to me. as suggested above, cut the shaft, heat it and hammer it out , drill straight through those Allen screws, (That will give them room to expand inward) get them them red hot and they will come out. If not, drill beside them and tap new holes. Hours worth of work, opposed to half an hour on the phone and then waiting for parts Quote Link to comment Share on other sites More sharing options...
Ihfan4life Posted May 15 Share Posted May 15 4 hours ago, Dave Downs said: Can't get the coupler off the pump shaft - yes I used heat..... Thermo-cycle it with cold water. Repeatedly until it breaks, or it comes apart. The trouble with heat is the heat will expand everything. You need to heat and rapidly cool the outer portion to get it to release. Not an expert- just my limited experience… Quote Link to comment Share on other sites More sharing options...
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