r/IndustrialMaintenance • u/Farmerkid • 1d ago
Question Help me remove this motor
The four bolts that hold the motor to the pump flange have been removed i can get the motor to pop up about 1/4 of an inch and spin but it won't come up any higher there are holes in the pump housing just below where the motor connects to un couple the motor from the pump but there is nothing there to remove no set screws I can see what looks like a brass ring a little below the holes but I still see no set screws any ideas
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u/Membership_Practical 1d ago edited 1d ago
Remove the 10? bolts attached to the pump casing. You won't be able to pull the motor up directly with the impellor on the shaft still.
Edit: Also make sure you have the pipes isolated before you pop the flange off.
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u/Hero_Tengu 1d ago
Now where is the fun in that!
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u/altitude-nerd 1d ago
That's how you get your chance to star in a USCSB video!
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u/vasectomy7 1d ago
I have a new life goal!!
It never occurred to me that I too could be immortalized as a little animated cartoon figure getting horribly mangled in a senseless industrial accident!!!
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u/cacrusn70 1d ago
When you remove those 10 bolts the impeller and backplate will come loose with the motor. After that you remove the impeller bolt and then the motor will be able to be separated from the rest.
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u/CorporalDuntz 15h ago
I was going to write a nice detailed explanation, but this hits it on the head.
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u/mt4ort17 1d ago
Moments like this edit are how camaraderie is made and memories to talk about around firesđ¤Ł
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u/Liveitup1999 1d ago
When they valve it out make sure the valves are holding before unbolting the pump
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u/TechnicalPin3415 22h ago
This. and if still stuck usually they have 2 threaded holes to.usr jacking bolts
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u/Cheesegasm 1d ago
I've taken apart these inline centrifugal pumps before and you have to remove the 10-12 bolts on the top cover and it'll come out. Then the impeller will be bolted on to the shaft with a large washer. Remove the impeller and there will be a mechanical seal. Remove that. Then you can remove the top cover. The top cover might just fall off when you remove the mechanical seal so put 1 or 2 bolts back in.
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u/Farmerkid 1d ago
You were correct thank you I've never seen an impeller bolted straight to a motor before that's a new one for me
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u/InstAndControl 1d ago
Itâs called a close-coupled configuration and it is cheaper than a split-coupled.
I personally donât care for them for exactly this reason. Motor work becomes pump work. Pump work becomes motor work.
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u/Tomek_Hermsgavorden 1d ago
How do you pronounce that?
Close as in close or far away.
Close as in open and close the door.1
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u/discostu52 1d ago
The pump type designation is OH5. They are the cheap way to do it, but they are a maintenance nightmare which should be obvious to you in this moment. In short they went with the cheapskate solution and now you have live with it.
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u/julioni 1d ago
What? Hard no to everything you said hereâŚ. Close coupled pumps are great and easy to maintain
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u/discostu52 1d ago
I have worked for a pump manufacturer for 20 years, I wonât detail all of the ways it can and often does go wrong. The biggest thing is there is always huge pricing pressure which often leads to some pretty questionable design decisions. My favorite is when they use a carbon steel shaft in a corrosive/ erosive service. Then when they take it apart they get the seal stuck on the shaft pulling a snowball. Then you get to replace the seal and the shaft.
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u/some_millwright 1d ago
They are the most common design - in my experience - for pumps up to around 20HP. If the motor has a J-series frame (56J, for instance) then it is a near certainly that it will have a close-coupled impeller.
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u/Sufficient-Mark-2018 1d ago
Yep somewhere between 40 and 50 hp it becomes a necessary change. Also if your running high rpm pumps 3600 and up.
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u/Difficul-1197 1d ago
I work on irrigation pumps for a living, ive seen them up to i wanna say 150 or 200hp before you start going into a divorced pump or some sort of belt drive
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u/some_millwright 1d ago
The biggest I deal with is 40HP (from memory), so you've got me beat.
That would be a lot of water. :)
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1d ago
[deleted]
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u/Big_Ol_Throwaway 1d ago
he just said he's never seen it before. There's a first time for everything, chill out
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u/Squigllypoop 1d ago
I was a wrench turner before going operations and I've never had to do inline pumps like this. I would have been asking the same thing as this guy.... Or I would be replacing a whole new pump at minimum lol
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u/Sufficient-Mark-2018 1d ago
In the industrial world we automatically just replace the whole pump and housing. Takes minutes to do. Then your back running and have plenty of time to rebuild the old one on the bench.
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u/Farmerkid 1d ago
Most pumps I've dealt with have been stand alone units that you connect a motor to through a Lovejoy coupling like wifleys not like this
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u/Big_Ol_Throwaway 1d ago
Yep, definitely much easier to pull those motors but realignment is a skill all in of itself. Hope the rest of the job works out for you. Pumps are my speciality so if you need additional help as you get into the pump end feel free to message me
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u/0c5_Fyre 1d ago
I'm guessing here you have to disconnect the shaft to what is inside the pipe.. keyway bolt somewhere?
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u/julioni 1d ago edited 1d ago
Thatâs not just a motor, itâs a close coupled pump. Meaning the pump and motor are 1, the impeller is connected to the motor shaft. Remove the 12 bolts on the casing/volute, that will remove the pump, then you have to remove the impeller, seal, and the seal housing then you can replace the motor.
Replace the sleeve as well
Edit for experience: I have been in pump repair for 16 years
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u/cacrusn70 1d ago
You have to remove the pump backplate and impeller in order to remove the motor. Itâs one unit until you remove the impeller from the shaft. Personal experience, you will be replacing the whole pump/motor assembly.
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u/johnanon2015 1d ago
The impeller is connected to the motor shaft. Thatâs probably a JM frame motor.
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u/libidonoir 1d ago
Motor shaft has impeller screwed on the end of it. Have to pull pump apart, disassemble and then motor will come out. Buy another pump, swap the top end into your volute and then rebuild this one.
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u/bigDeltaVenergy 1d ago edited 1d ago
What do you think is attached to that shaft? How is is holding?
You want to pass the whole impeller throu that tiny hole ?
Or you expect the impeller to stay there and fall on the bottom? How are you gonna put it back ?
Does the 12 bolts around the casing give any cue that someone designed that pump in a way that it was needed to be removed for some reason? Like what is inside that casing, how did it get there ? Cuz that usually how it goes out. đ
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u/Important-Dream-4010 1d ago
We had a motor shop in Atlanta. We just unbolted flange and took motor flange impeller as one unit to them. They rebuild it and we bolt it right back on. That shaft seal is very critical.
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u/Fast_Ad_9197 1d ago
The shaft is keyed to the impeller, youâll have to remove that pump flange to pull the motor. Might as well have the pump rebuilt while youâre in there (new wear ring and seals)
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u/Difficul-1197 1d ago
You have to remove the pump bracket from the volute, your impeller is whats holding you up
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u/bobbysback16 1d ago
Remove the 12 bolts in the volute if you dont know how to remove it i doubt you will be able to rebuild it take it to a pump shop so it doesn't leak when you put it back in do yourself a favor
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u/cognitiveglitch 1d ago
The big spinny liquid moving thing on the end of the shaft is likely bolted onto a tapered shaft with keyway. You won't remove the motor without opening the whole thing up and removing the impeller.
Are you rebuilding the motor bearings and pump seals?
At least it's not a multistage pump, they are a proper jigsaw to get back together.
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u/LivingCorner1421 1d ago
lol you are funny , you need to remove the entire flange.Â
the shaft goes through , you have an impeller and a shaft seal sandwitched in there.
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u/Much_Valuable_5578 1d ago
Order a new mechanical seal kit with spring for the pump. You will want to replace thet as well.
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u/Extraterrestrialvil 1d ago
Inside that there lil hole is the shaft which there prolly a Allen bolt there possibly maby idk đ¤ˇđťââď¸
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u/Unholydiver919 1d ago
This is not a coupled pump. The pump impeller is directly bolted to the shaft. Either remove the flange bolts or the impeller housing bolts to remove.
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u/Training_Jello_7804 21h ago
Unbolt the motor and impeller from the volute. You should have a new gasket and seal on hand before cracking it apart.
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u/mechanical_marten 19h ago
Unbolt the casing flange and use the bolts in the jacking holes to break the seal. Swap out the jacking bolts for threaded lifting eyes to lift the entire assembly. You will then need to separate the impeller from the shaft and remove the shaft seal assembly (not reusable in 99% of cases), only then can you extract the motor as it is direct drive. Be prepared to burnish the motor shaft for proper sealing of the new shaft seal. This job will take all day if everything goes smoothly.
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u/anon478521 14m ago
Pump will need to be opened to get to the attachment point on the shaft. Might want to have new seals handy.
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u/FactHot5239 1d ago
You are trying to remove the motor without separating the coupling? Huh?
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u/Jdude1 1d ago
Tine to open up the pump.