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post #16 of 26 Old 03-04-2019, 11:34 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

I wonder if it is simply the quality of the bearings I am getting. I try to buy good quality, but, those seem to be in short supply lately. The races press into the housings fairly tight, but, I have never seen shims for the bearings..... according to theory, the spindle itself is machined to the 'correct' tolerance, so the bearings have the proper pre-load. Is there a spec for rotational torque on new bearings?? I have never found one......

I have been a mechanic in the automotive field for several decades, so, I like to think I have at least some clue of what I am doing....
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post #17 of 26 Old 03-04-2019, 08:20 PM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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I wonder if it is simply the quality of the bearings I am getting. I try to buy good quality, but, those seem to be in short supply lately. The races press into the housings fairly tight, but, I have never seen shims for the bearings..... according to theory, the spindle itself is machined to the 'correct' tolerance, so the bearings have the proper pre-load. Is there a spec for rotational torque on new bearings?? I have never found one......

I have been a mechanic in the automotive field for several decades, so, I like to think I have at least some clue of what I am doing....
You have the shoulder or spacer on the spindle with a large nut tensioning the inner races, and you also have the housing with shoulders positioning the outer races. It would not be unusual for the inner races to slowly spin on the spindle shaft, and over a period of time wear the shoulders down a little bit on the spindle. I would think shims would be the prudent thing to use, even if they were not available from Gravely. McMaster Carr may have some that would work.

I would think you would want some tension on the bearings, just like the pinion bearings in a rearend or the bearings in a steering box.
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post #18 of 26 Old 03-07-2019, 09:46 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by franklin2 View Post
You have the shoulder or spacer on the spindle with a large nut tensioning the inner races, and you also have the housing with shoulders positioning the outer races. It would not be unusual for the inner races to slowly spin on the spindle shaft, and over a period of time wear the shoulders down a little bit on the spindle. I would think shims would be the prudent thing to use, even if they were not available from Gravely. McMaster Carr may have some that would work.

I would think you would want some tension on the bearings, just like the pinion bearings in a rearend or the bearings in a steering box.
Could all well be. I may dig thru my spindle pile, and see if I can't get some stock dimensions for them. I have a local machine shop that has been doing various things for me, and their prices are reasonable.... Might have a chat with them.

The bearings are ostensibly trailer wheel bearings..... I have done them on cars for decades, and not had this much trouble with them.... and the ones on cars are carrying a LOT more weight. I should not have to change these fellers every couple years.....
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post #19 of 26 Old 03-08-2019, 10:55 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Could all well be. I may dig thru my spindle pile, and see if I can't get some stock dimensions for them. I have a local machine shop that has been doing various things for me, and their prices are reasonable.... Might have a chat with them.

The bearings are ostensibly trailer wheel bearings..... I have done them on cars for decades, and not had this much trouble with them.... and the ones on cars are carrying a LOT more weight. I should not have to change these fellers every couple years.....
I put new deck bearings on the belly mower for a Economy tractor, and they actually were trailer bearings and hubs. The hubs had the wheel studs in them and the deck was drilled for that 5 on 4.5 pattern and that mounted the hub. They used the standard trailer wheel bearings and Economy made a custom axle shaft to accept the pulley and to mount the blade underneath.
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post #20 of 26 Old 03-08-2019, 11:39 PM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by HeyYou View Post
Could all well be. I may dig thru my spindle pile, and see if I can't get some stock dimensions for them. I have a local machine shop that has been doing various things for me, and their prices are reasonable.... Might have a chat with them.

The bearings are ostensibly trailer wheel bearings..... I have done them on cars for decades, and not had this much trouble with them.... and the ones on cars are carrying a LOT more weight. I should not have to change these fellers every couple years.....
Yes, they are trailer/wheel bearings, but they are not "preloaded" in this application. If the shaft/housing relationship is not correct, they will fail prematurely.

It does pay to invest in new shafts for these hubs if needed.

In my improvement thread I go over the details of my rebuild, and how I created a hybrid spindle assembly that has worked out well. I have rubber seals on the bottom, and the metal labyrinth seals on the top.

Starting on page 34, you can read about my rebuild here:

https://www.mytractorforum.com/24-gr...rovements.html

Not sure if yours are exactly the same, but it is the same design principle on your deck. The spindle shafts on the 40"/50" decks went thru some design evolution and the newest version is better.

Same may be true for yours as well.

Sheldon

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post #21 of 26 Old 03-09-2019, 02:01 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by REDGRAVELY 8199KT View Post
Was wondering how often you Gravely owners grease your mower deck? Mine has a 60 inch floating deck and it has a lot of Grease fittings on it! Do you grease it before every use or otherwise? Am mowing 1 acre. Also what wt oil are you using in the winter. Thanks for the input!
if ur mow 1 acre I would say to grease the deck every time before u mow..

on the oil it depends on the engine.. the Kohler Commands use 10 W 30 oil.. the cast iron Kohlers use straight 30 weight.. if it a B & S engine use straight 30 weight.. the Commands & the V twins PRO' have HYD lifters..


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post #22 of 26 Old 03-09-2019, 07:55 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

Here is a good read on tapered roller bearings and pre-loading them. I didn't read the whole thing, but I did read they say the ideal setting is zero clearance for the bearings upon assembly. Some pre-load can be applied if your application requires it, but it must be kept to a minimum. So a critical application like rearend gears in a car or the steering box, can have some pre-load. From what I am reading, a mower deck would not be a very critical application, and for the best bearing life, a near zero clearance in the bearings would be the best.

https://www.timken.com/wp-content/up...Brochure-1.pdf
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post #23 of 26 Old 03-09-2019, 09:58 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by ATLANTIC CENTRAL View Post
Yes, they are trailer/wheel bearings, but they are not "preloaded" in this application. If the shaft/housing relationship is not correct, they will fail prematurely.

It does pay to invest in new shafts for these hubs if needed.

In my improvement thread I go over the details of my rebuild, and how I created a hybrid spindle assembly that has worked out well. I have rubber seals on the bottom, and the metal labyrinth seals on the top.

Starting on page 34, you can read about my rebuild here:

https://www.mytractorforum.com/24-gr...rovements.html

Not sure if yours are exactly the same, but it is the same design principle on your deck. The spindle shafts on the 40"/50" decks went thru some design evolution and the newest version is better.

Same may be true for yours as well.

Sheldon
Your spindles look exactly the same as mine. I wouldn't mind just putting all new parts into it, but, that gets expensive in a hurry, and is a major undertaking on the 72" deck. I just don't have the scratch for that kind of behavior. (much as I would love to.)
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post #24 of 26 Old 03-09-2019, 05:33 PM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by HeyYou View Post
Your spindles look exactly the same as mine. I wouldn't mind just putting all new parts into it, but, that gets expensive in a hurry, and is a major undertaking on the 72" deck. I just don't have the scratch for that kind of behavior. (much as I would love to.)
Well, yes, the spindle shafts cost about $68.00 each.

But how long will it take to equal that in replacement bearings every few years? And your time and effort?

Again, my deck was bought new and went over 500 hours/14 years before needing the spindles overhauled.

If we assume the overhaul will last 14 years, lets call the shaft and bearings $100 per spindle, divided by 14 years = $7.14 per year per spindle.

I checked some prices on genuine Timken #14 sets, about $15 each or $30 per spindle - I'm sure there are cheaper brands but.......

If you have to replace them every two or three years, that is 5 replacements x $30 = $150 per spindle, divided by 14 years = $10.71 per year per spindle.
I think I will save both my money and my valuable time over the long run.......

Changing the shaft is no more work then changing just the bearings?

The bearings, races and shafts are the only needed parts? The metal seals do not go bad unless the thing really blows up?

When you are changing these bearings are you changing the race? If not, you are asking for them to fail early.

Sheldon


Last edited by ATLANTIC CENTRAL; 03-09-2019 at 06:06 PM.
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post #25 of 26 Old 03-11-2019, 10:15 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by ATLANTIC CENTRAL View Post
Well, yes, the spindle shafts cost about $68.00 each.

But how long will it take to equal that in replacement bearings every few years? And your time and effort?

Again, my deck was bought new and went over 500 hours/14 years before needing the spindles overhauled.

If we assume the overhaul will last 14 years, lets call the shaft and bearings $100 per spindle, divided by 14 years = $7.14 per year per spindle.

I checked some prices on genuine Timken #14 sets, about $15 each or $30 per spindle - I'm sure there are cheaper brands but.......

If you have to replace them every two or three years, that is 5 replacements x $30 = $150 per spindle, divided by 14 years = $10.71 per year per spindle.
I think I will save both my money and my valuable time over the long run.......

Changing the shaft is no more work then changing just the bearings?

The bearings, races and shafts are the only needed parts? The metal seals do not go bad unless the thing really blows up?

When you are changing these bearings are you changing the race? If not, you are asking for them to fail early.

Sheldon
Yes, the race gets changed as well. Would be pointless to do it any other way.
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post #26 of 26 Old 03-13-2019, 09:07 AM
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Re: 2 Questions , How often do you grease your deck, and what wt of oil do you use!

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Originally Posted by mcsquish View Post
WH401, what would you recommend for the gearbox?
Redgravely, I grease my deck whenever I scrape the underside of the deck to remove the grass build up. My theory is that if there is grass build up, Iíve beeen in wetish grass. And yes the grease fittings are on the underside of the deck.
I prefer to use 00 grease, which is a thinner consistency of grease, but not as thin as oil. I only use it though if the bottom seal is in good shape, otherwise the grease can go right past the seal.

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