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(Another) Hardin pump issues thread...

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Old 06-20-2019, 07:32 AM
  #31  
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Mine looked the same and did not wear the impeller. Changed the impeller out this spring after 2 seasons and the impeller still looked new. Never had any pressure issues running this pump. In fact, my pressure picked up over stock at idle. And yes, that inner wear plate would be easy to miss. And on my pump was a bear to get the old one out to replace with the rebuild kit.
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Old 06-20-2019, 11:52 AM
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Fair enough then! And thanks for everybody’s help on sorting out my boneheaded oversight.

Ive ordered the plate and will post the results. I may still run a small hone in that baby just because. ;p
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Old 06-20-2019, 05:10 PM
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I have the same pump. I change my impeller once a year as maintenance . Never have had a problem with any part of it. Jeff Wurl
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Old 06-20-2019, 05:13 PM
  #34  
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Originally Posted by Baja Rooster

It looks like nearly an 1/8” gap. This is the oem Merc impeller. I got a Sierra one laying around and brand new measures even smaller.

your going to need very thick grease. I hope harden gives you something for the pain
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Old 06-20-2019, 08:11 PM
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Originally Posted by 14 apache
I hope harden gives you something for the pain
They did give him something for the pain... the wear plate that he forgot to install. lol

Glad it was an easy fix.
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Old 06-20-2019, 08:32 PM
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Originally Posted by Rookie
They did give him something for the pain... the wear plate that he forgot to install. lol

Glad it was an easy fix.
I didn't see the part where he left it out lol.
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Old 06-21-2019, 07:08 AM
  #37  
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Thin coat of white lithium is all I have ever used to pre-lube any impeller in any housing. I believe the Hardin rebuild kit also suggests using lithium grease.
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Old 06-21-2019, 07:35 AM
  #38  
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Originally Posted by Baja Rooster
Fair enough then! And thanks for everybody’s help on sorting out my boneheaded oversight.

Ive ordered the plate and will post the results. I may still run a small hone in that baby just because. ;p
you threw it away
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Old 06-21-2019, 08:11 AM
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I've been running this pump on my 525 for years with no problem. Used to change impeller every year but it always looks like new so now I do it every 2 years.
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Old 06-21-2019, 08:56 AM
  #40  
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water base KY or glycerin to install impellers, Johnson pumps has done many studies on this and have found glycerin to be the best for installing impellers. Glycerin -- It washes out at start up very very quickly - many other products do not wash out very quickly. And dish soap exacts the oil out of impellers. All rubber products are a form of an oil base .

Johnson includes the glycerin in every impeller kit they sell for a reason. Like I said they tested everything

Actually tech speaking clean water is the best for impellers no matter how you slice it because thats what they live in 24 / 7

Impellers and the housing is all about tolerances - when wrong it does not work nor flow correctly

Last edited by BUP; 06-21-2019 at 09:01 AM.
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