I also had a emergency pump repair rebuild yesterday and this morning. I had this pump feeding water to may course material screw and we lost a ton of volume and pressure. This turned into a emergency as i use this pump on my washplant and need to have that running between now and freeze up.
Shes kinda ugly but works awesome. Just float it out in the pond and give it power. No fucking with priming, suction pipes foot valves ect.
I first went to ag pump supply shop to see if they had one. Well they had a 20hp 480v horizontal pump. they wanted 1000 a week to rent or 12,500 to buy. I was out. So plan b do the worlds quickest rebuild/ repair. There is no getting parts in a day or two so I hoped I could just make what o needed.
Tearing it down i found my issue. The impeller was 3/16 away from the housing and to top it off I could push it up another 3/8” of a inch. I figured that lifting was causeing it to stall out .
Also the bronze bushing that is next to impeller was egged shaped 1/4”. So I started on fixing the bushing first. Called up the local metal supply house and found out they only had a 2.5” dia piece onhand. Fuck I needed a piece 2.75 in dia. So I tossed her on the Bridgeport and bushed the bushing lol. It got a press for, some locktite sleeve retainer and drilled and tapped the part line between them. Running a Allen screw in the parting line should keep them from spinning and help hold it into place.
Next I tossed 4 weld passes on the impeller to help build it back up.
Not pretty but it should work. The movement up and down come from a snap ring groove that got wore down. A simple .375 spacer and bingo the beating can’t float up. I got up this morning at 4:30 to reassemble and get it running as the boys were comming in to run washplant for a half day.
Got it back together and once I tightened everything up the fucking shaft wouldn’t turn. Once again I made my bushing tolerances too tight. So my options were take it back apart losing a day of running or loosen it up till the shaft turns and plug the bitch in and let it seat itself. Well I choose option two. I dumped some oil on the bronze bushing fire it up and slowly tightened everything up. It took about 10 mins but the bronze was no match for a steel shaft going 1800 rpm.
She has been going great for the last 5 hours. Hopefully it will go for another month until I can tear it back down and get the correct parts to do a proper rebuild.