How much grease?

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I just replaced the bearing on my mower deck and removed the inner seal on each so that they actually receive grease. How much grease should I pump into the spindles? Will it come out of the top and bottom when full, or will that pop out the top seals on the bearings?
 
Should have left the seals in.
I've had bearings on mower spindles that have seals on both sides, it appears to be a sealed bearing meant to keep the grease in and debris out and if that is what the op has than greasing the spindles wont do any good unless the inner seal is removed.

As far as how much grease to pump in after replacing bearings, my method is I pump grease in until I feel it start to pump harder than stop and add a couple pumps every 10 hrs of use after that.
I prefer not to pump it until it pushes out past the seal but did it a couple time over the years and it didn't seem to hurt anything.
 
I just replaced the bearing on my mower deck and removed the inner seal on each so that they actually receive grease. How much grease should I pump into the spindles? Will it come out of the top and bottom when full, or will that pop out the top seals on the bearings?
I would think if you see grease coming out the top or bottom the remaining seal is blown a grease gun makes a great amount of pressure 500-1000psi is nothing. All is not lost if you grease it often and don't mow in a lake or go crazy washing the deck, Best if you would have totally filled the spinel before you put the last bearing in, then a pump or 2 should be enough for 10 + hours of mowing. How long did the old bearings last?
 
I would think if you see grease coming out the top or bottom the remaining seal is blown a grease gun makes a great amount of pressure 500-1000psi is nothing. All is not lost if you grease it often and don't mow in a lake or go crazy washing the deck, Best if you would have totally filled the spinel before you put the last bearing in, then a pump or 2 should be enough for 10 + hours of mowing. How long did the old bearings last?
Not sure I got the mower from my father in law. I can always take the bearing out again and fill the spindles
 
Not sure I got the mower from my father in law. I can always take the bearing out again and fill the spindles

So I did this when I rebuilt my JD LT150 deck this spring. I assembled the spindles then filled with grease. If I did it again I would have left the top bearing out and filled with grease, then put the top bearing in. I figure every spring a couple pumps and she'll be good to go.

Here is actually an interesting video on the whole situation...


Just my $0.02
 
Should have left the seals in.
Agree, now dirt and grit will enter and shorten the spindle's life.

If it has fittings, I usually pumped just a few pumps into the fitting. You don't want the grease blowing out the seals and getting all over the belt and pulleys.
 
Agree, now dirt and grit will enter and shorten the spindle's life.

If it has fittings, I usually pumped just a few pumps into the fitting. You don't want the grease blowing out the seals and getting all over the belt and pulleys.
What’s the point of having grease fitting on the spindle and having bearings that are completely sealed? Seems counter productive to me. I’m leaving the top and bottom seals in so it keeps dust and dirt out while still being able to active grease the bearings. The people who make the spindles want to sell more spindles, hence the sealed bearings. 🤦🏻
 
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What’s the point of having grease fitting on the spindle and having bearings that are completely sealed? Seems counter productive to me. I’m leaving the top and bottom seals in so it keeps dust and dirt out while still being able to active grease the bearings. The people who make the spindles want to sell more spindles, hence the sealed bearings. 🤦🏻
I agree with you. You have left the outside seals on so dirt won’t get in and now the zerk actually has a purpose! 🤣

just my $0.02
 
You just shortened the life of the bearings by removing a seal. Contaminants can come in and damage the bearing. You would have done better by ignoring the zerk.

During manufacture, grease should occupy no more than 30% of the bearing cavity. The zerk allowed a minimal amount of new grease to be introduced periodically, not to fill the cavity.
 
You just shortened the life of the bearings by removing a seal. Contaminants can come in and damage the bearing. You would have done better by ignoring the zerk.

During manufacture, grease should occupy no more than 30% of the bearing cavity. The zerk allowed a minimal amount of new grease to be introduced periodically, not to fill the cavity.
Exactly true.
 
You just shortened the life of the bearings byremoving a seal. Contaminants can come in and damage the bearing. You would have done better by ignoring the zerk.

During manufacture, grease should occupy no more than 30% of the bearing cavity. The zerk allowed a minimal amount of new grease to be introduced periodically, not to fill the cavity.
How would the grease be added to a sealed bearing?
 
You don't. Not every application requires grease to be added. Grease can last a long time (as evidenced by automotive wheel bearings). You would have been better off running the bearings as is for life, instead of allowing contaminants to shorten life.
 
You don't. Not every application requires grease to be added. Grease can last a long time (as evidenced by automotive wheel bearings). You would have been better off running the bearings as is for life, instead of allowing contaminants to shorten life.
Personally I’ll take a zerk over a sealed unit any day. I’d rather maintain my stuff than trust LFL.

This feels kinda like the ole no oil change argument needed…

just my $0.02
 
Personally I’ll take a zerk over a sealed unit any day. I’d rather maintain my stuff than trust LFL.

This feels kinda like the ole no oil change argument needed…

just my $0.02
The two are not comparable. Contaminants from the products of combustion and elsewhere are continually getting into your motor oil. The purpose of a sealed bearing unit is to keep contaminants out. My experience has been exactly the opposite of what you stated. The only greased joints I’ve ever had fail prematurely are ones that had a zerk fitting, perhaps it was just that they were cheap units I don’t know. They weren’t supposed to be cheap however.
 
The two are not comparable. Contaminants from the products of combustion and elsewhere are continually getting into your motor oil. The purpose of a sealed bearing unit is to keep contaminants out. My experience has been exactly the opposite of what you stated. The only greased joints I’ve ever had fail prematurely are ones that had a zerk fitting, perhaps it was just that they were cheap units I don’t know. They weren’t supposed to be cheap however.

I guess that’s the diversity of this forum. The only joints I’ve had fail in my life are LFL sealed joints or non lube u-joints. To each their own I guess. I’ll let you know how my spindle bearings work out, but so far so good.

Just my $0.02
 
I just replaced the bearing on my mower deck and removed the inner seal on each so that they actually receive grease. How much grease should I pump into the spindles? Will it come out of the top and bottom when full, or will that pop out the top seals on the bearings?
You did the right thing. Now drill a small hole in the spindle housing opposite the grease fitting, just bellow the top bearing. When you grease
the spindle watch for the grease at the hole. Plug the hole with a self tapping screw. Grease about twice a year. My ZTR has greaseable spindles,
11 years old / 600+ hrs. and never a bearing problem.
 
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