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Old 10-06-2018, 10:10 PM   #1
Kenw
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Axle Maintenance FYI

To all,
This is an FYI
After reading many many posts here on axle maintenance I finally got into performing mine. I have a 2017 Montana HC 370 BR, 7000# axles with the e-z lube system, 18 months old now, approximately 4200 miles on the axles, stickered weight 11850 pounds, axles produced March 2, 2017. I did not use the e-z lube system and opted to pull the hubs, clean everything, replace the bearings with Timken and replace the grease seals. The grease in the hubs was red in color. Here is what I found...

Hubs 1-3 Everything was good, not a lot of grease and virtually none in the cavity between the bearings, no scaring but one small brown mark the size of my thumb nail in one of the outer bearings.

Hub#4 The front bearing had very very little grease in it. I could see through every cavity of the bearing as it didn't have any grease in it and a small brown mark in the interior race. The rear bearing troubled me! The amount of grease was OK but it was black in color and it seamed to have very small (shiney)particulates of metal in it. When I say black I mean black! There was a little wear on the bearing but if I were not replacing them I would have put it back in.

Dexter needs to put more grease in these assemblies and Keystone needs to tell their supplier to add more grease. Gee, Dexter/Keystone must be saving 50 cents per axle by providing the minimum amount of grease possible.

Ken
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Old 10-06-2018, 10:14 PM   #2
coachgrowl
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Part numbers for bearings please. Thanks in advance.
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Old 10-06-2018, 10:41 PM   #3
Montana Man
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I have the same axles and they were undergreased as well.
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Old 10-07-2018, 12:27 AM   #4
rohrmann
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Also, when replacing the bearings, the races must be replaced too. This is the Timken link to their catalog with a description of servicing these bearings starting on page 62 https://www.timken.com/wp-content/up...81.pdf#page=58
There does not need to be any grease in the hub, only at the bearings. There is a very good video on the Timken site that explains the adjustment of these bearings. Go to this link, http://www.timken.com/engineering-to...nds-on-videos/ and view the video titled
'Proper Tapered Roller Bearing Installation in the Hub Assembly"


For the 7,000 Dexter axle with the 12" X 2" brake drum assembly, and E-Z Lube design, the parts are:


Inner bearing- 25580
Inner race- 25520
Outer bearing- 14125A
Outer race- 14276
Wheel seal- 010-036-00, also known as 10-36, 3.376" OD X 2.25" ID double lip for E-Z lube





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Old 10-07-2018, 08:35 AM   #5
mhs4771
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Sounds like Dexter has done a complete Flip-Flop. For years many of us had totally grease covered Brake shoes because of over greasing that was found because of poor braking or at the first time the hubs were pulled.
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Old 10-07-2018, 02:53 PM   #6
RichR
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That's the reason I had the dealer re-pack the bearings when I bought the trailer- I don't trust the manufactor to do whats right
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Old 10-08-2018, 04:10 PM   #7
WaltBennett
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Quote:
Originally Posted by RichR View Post
That's the reason I had the dealer re-pack the bearings when I bought the trailer- I don't trust the manufactor to do whats right

Doesn't matter who you have do it, you had better know where the person lives that did it as there's absolutely no telling if they have a clue as to what they're doing. I do mine myself.
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Old 10-17-2018, 06:17 PM   #8
Randy E
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Angry Axle Maintenance

We Have a 2017 3791RD. I too decided to do my first years maintenance on the axles. I did use the EZ lube system. What I found was, when I added the red axle grease with my grease gun, it took 115 pumps to get old grease out the front of the discharge area. There must have been absolutely no grease inside the housing. I added 3- 1/2 tubes of grease in 4 hubs. I'm sure it only had enough grease on the bearing to keep it from rusting when it was in a box being shipped to Dexter for assembly. I agree, It would cost them 50 cents, and possibly another 15 seconds to use their air powered grease gun and fill the housing properly. This in turn would keep us, the customer, happy, making us to demand that the next new RV we purchase would have Dexter axles under it. As it stands, I don't think they care one bit about us. Why would you go through the process to build a quality product, only to have it all screwed up by the last person to touch it?
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Old 10-17-2018, 06:53 PM   #9
rohrmann
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Like I said, the grease only needs to be on the bearings. Grease inside the hubs does nothing, and if the hub is completely full, there is a real possibility that a seal will fail and grease will get on the brake shoes. A good packing of the bearings, either by hand or with a mechanical packer, them a small amount added at the races is all the grease needed. If the hub is full of grease, it is an extremely messy job pulling a drum off to inspect the brakes, and all that perfectly good, unused grease inside the center of the hub is trashed, along with a lot of rags used to clean up the mess.
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Old 10-17-2018, 07:08 PM   #10
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Quote:
Originally Posted by rohrmann View Post
Like I said, the grease only needs to be on the bearings. Grease inside the hubs does nothing, and if the hub is completely full, there is a real possibility that a seal will fail and grease will get on the brake shoes. A good packing of the bearings, either by hand or with a mechanical packer, them a small amount added at the races is all the grease needed. If the hub is full of grease, it is an extremely messy job pulling a drum off to inspect the brakes, and all that perfectly good, unused grease inside the center of the hub is trashed, along with a lot of rags used to clean up the mess.
I think you hit the nail right on the head.
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