My son, who works as a Global Supply Chain Manager at Timken Bearing, sent me this article that Timken authored and which recently appeared on the Machine Design.com website.
Some interesting fresh thoughts about what causes bearing failure.
He also sent Timken's bearing failure wall chart. Feel free to download both below.
Bill
http://www.cckw.org/pdf/timken_bearing_killers.pdf
http://www.cckw.org/pdf/timken_bearing_damage_chart.pdf
Timken Bearing Failure information
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- Brigadier General
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Timken Bearing Failure information
1945 GMC DUKW
1942 Chevy 125 Crash Truck from Dow AAFB,
1944 Chevy 325 Fire Truck
1942 WC-54 Ambulance
1944 M29C Weasel (x6)
1945 CCKW 353 A2 Open Cab "Air-portable"
1943 M5 High Speed Tractor
1942 Sperry Searchlight setup with GE Generator
1942 M-1 Fruehauf Searchlight Trailer (G221)
1942 M-17 Fruehauf Quad 50 Trailer (G221)
1942 M-10 Ammo Trailer (x3)
194? Steel Ben Hur (x4) 194? Wood Ben Hur (x2)
1945 Case VAIW-3 Aircraft Tug
1943 Case VAI USAAF with Mower
1944 Clark CA-1 Airborne Dozer
1944 PE-95G, 1944 PE-99B
1942 Chevy 125 Crash Truck from Dow AAFB,
1944 Chevy 325 Fire Truck
1942 WC-54 Ambulance
1944 M29C Weasel (x6)
1945 CCKW 353 A2 Open Cab "Air-portable"
1943 M5 High Speed Tractor
1942 Sperry Searchlight setup with GE Generator
1942 M-1 Fruehauf Searchlight Trailer (G221)
1942 M-17 Fruehauf Quad 50 Trailer (G221)
1942 M-10 Ammo Trailer (x3)
194? Steel Ben Hur (x4) 194? Wood Ben Hur (x2)
1945 Case VAIW-3 Aircraft Tug
1943 Case VAI USAAF with Mower
1944 Clark CA-1 Airborne Dozer
1944 PE-95G, 1944 PE-99B
- Barry Churcher
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Re: Timken Bearing Failure information
Thanks for that Bill. Very interesting.
1944 Chev. C15TA
DAF YA314 ----- Chev. G506
Ford F15A (4)
Chev C15A (2)
Ben Hur Fuel Transfer
Polynor Trailer
Drone Winch Trailer
GE Searchlight
Nekaf
1953 M38A1
Telephone Reel Hand Cart
British GS Trailer
M101
M101 with Water Tank
101 CDN-2 (2)
WW2 Water Trailer
M-274 A5 Mule
DAF YA314 ----- Chev. G506
Ford F15A (4)
Chev C15A (2)
Ben Hur Fuel Transfer
Polynor Trailer
Drone Winch Trailer
GE Searchlight
Nekaf
1953 M38A1
Telephone Reel Hand Cart
British GS Trailer
M101
M101 with Water Tank
101 CDN-2 (2)
WW2 Water Trailer
M-274 A5 Mule
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Re: Timken Bearing Failure information
One thing that they didn't mention is brinelling. That is when a bearing (ball is probably the worst) sits in the same place for a long period of time under load. The small contact point tends to harden and is prone to shattering when in use later on.
Brinelling typically results from a heavy or repeated impact load, either while stopped or during rotation. It can also occur from a heavy load remaining on the bearing for a length of time in a stopped position.
There is also false Brinelling
Brinelling typically results from a heavy or repeated impact load, either while stopped or during rotation. It can also occur from a heavy load remaining on the bearing for a length of time in a stopped position.
There is also false Brinelling
Dr Deuce Over 50,000 driven miles in a CCKW
1942 CCKW closed cab shopvan
1943 CCKW closed cab cargo w/M32 MG mount
1944 CCKW open cab LeRoi Kompressor
1944 CCKW open cab F1 Aircraft fueler tanker
1945 CCKW open cab cargo w/artic cab
1942 Chev cargo
1942 Chev K51 Panel
1944 Chev M6 Bomb Truck
1942 GPW Jeep
http://home.comcast.net/~cckw/wsb/html/ ... 59870.html
1942 CCKW closed cab shopvan
1943 CCKW closed cab cargo w/M32 MG mount
1944 CCKW open cab LeRoi Kompressor
1944 CCKW open cab F1 Aircraft fueler tanker
1945 CCKW open cab cargo w/artic cab
1942 Chev cargo
1942 Chev K51 Panel
1944 Chev M6 Bomb Truck
1942 GPW Jeep
http://home.comcast.net/~cckw/wsb/html/ ... 59870.html
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Re: Timken Bearing Failure information
Very interesting. Thanks for sharing this.
I especially liked the part about lubricant compatibility. I have had the debate for years with various mechanics concerning the correct way to repack bearings. I have always cleaned them with solvent and removed as much old grease as possible from the hub and other components before repacking. Many insist that just repacking the bearing with new grease is good enough - because, after all, grease is grease. (Not to mention that thoroughly cleaning the bearings also provides an opportunity to thoroughly inspect them.)
In addidtion to the above links, Mobil has more to say regarding comptability:
http://www.mobilindustrial.com/ind/engl ... bility.pdf
BTW, the second of Bill's links does have some information on brinneling and false brinneling.
Best Regards..
I especially liked the part about lubricant compatibility. I have had the debate for years with various mechanics concerning the correct way to repack bearings. I have always cleaned them with solvent and removed as much old grease as possible from the hub and other components before repacking. Many insist that just repacking the bearing with new grease is good enough - because, after all, grease is grease. (Not to mention that thoroughly cleaning the bearings also provides an opportunity to thoroughly inspect them.)
In addidtion to the above links, Mobil has more to say regarding comptability:
http://www.mobilindustrial.com/ind/engl ... bility.pdf
BTW, the second of Bill's links does have some information on brinneling and false brinneling.
Best Regards..
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Re: Timken Bearing Failure information
Yes brinelling is covered and is relevant to the G508. It's to be found in the upper and lower steering knuckle bearings, in the third axle oscillator bearings (I've seen the rollers embedded in the outer race to half its thickness) and in the banjo T/fer case hi range constant mesh gear which spends most of its time locked to the shaft and is supported on needle rollers.
These equate to applications where there is no spinning motion but at most only rocking back and forth.
David
These equate to applications where there is no spinning motion but at most only rocking back and forth.
David
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Re: Timken Bearing Failure information
I'm still kinda new to these trucks, so you need to help me out...
What exactly are the "third axle oscillator bearings" ?
Thanks..
Best Regards...
What exactly are the "third axle oscillator bearings" ?
Thanks..
Best Regards...
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- First Lieutenant
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Re: Timken Bearing Failure information
Third axle, oscillator axle or trunnion shaft refers to the axle unit bolted to the frame that the rear suspension pivots on or from. The CCKW has the spring seats attached to each end mounted on tapered roller bearings.
It is not a good application of tapered rollers because the spring seats just rock back and forth slightly when the intermediate and rear axles move up and down in relation to each other. As stated, I have seen these bearings with the rollers embedded to a depth of half the thickness of the outer race or cup. Some truck makes with a similar suspension arrangement use bronze bushings in this location.
David
It is not a good application of tapered rollers because the spring seats just rock back and forth slightly when the intermediate and rear axles move up and down in relation to each other. As stated, I have seen these bearings with the rollers embedded to a depth of half the thickness of the outer race or cup. Some truck makes with a similar suspension arrangement use bronze bushings in this location.
David
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Re: Timken Bearing Failure information
Ahhh... Gotcha.. Thx...
Yes, I can see how this, and the other examples you mentioned, would be tough applications for roller bearings.
Best Regards...
Yes, I can see how this, and the other examples you mentioned, would be tough applications for roller bearings.
Best Regards...
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Re: Timken Bearing Failure information
The 4 ton WW2 Diamond-T uses a bushing
Dr Deuce Over 50,000 driven miles in a CCKW
1942 CCKW closed cab shopvan
1943 CCKW closed cab cargo w/M32 MG mount
1944 CCKW open cab LeRoi Kompressor
1944 CCKW open cab F1 Aircraft fueler tanker
1945 CCKW open cab cargo w/artic cab
1942 Chev cargo
1942 Chev K51 Panel
1944 Chev M6 Bomb Truck
1942 GPW Jeep
http://home.comcast.net/~cckw/wsb/html/ ... 59870.html
1942 CCKW closed cab shopvan
1943 CCKW closed cab cargo w/M32 MG mount
1944 CCKW open cab LeRoi Kompressor
1944 CCKW open cab F1 Aircraft fueler tanker
1945 CCKW open cab cargo w/artic cab
1942 Chev cargo
1942 Chev K51 Panel
1944 Chev M6 Bomb Truck
1942 GPW Jeep
http://home.comcast.net/~cckw/wsb/html/ ... 59870.html