cardan shaft bearing lubrication
cardan shaft bearing lubrication
(OP)
Hi guys I got such a good response from from last thread so I want to put this one to the experts too. We have four large axial flow circulation pumps coupled to 350kW 6600 volt motor/gearbox via a large cardan shaft rotating at 330 rpm.
Bearing failure on the cardan shafts is far too frequent, often resulting in catastrophic failure of the cardan shaft.
In accordance with OEM specs we use a multi purpose lithium calcium grease. Engen super multi purpose grade 2.
Now we have had the cardan shafts repaired and the local repairer uses Chevron Caltex Molytex Ep which has molybdenum disulphide additive.
Yet the OEM specifically recommends against molybdebum additives.
Any ideas/recommendations out there. I personally believe the OEM recommended lubricant has delivered poor results so I am tempted to go with the Caltex Molytex EP ( one sdhaft already in use with this lube)
Bearing failure on the cardan shafts is far too frequent, often resulting in catastrophic failure of the cardan shaft.
In accordance with OEM specs we use a multi purpose lithium calcium grease. Engen super multi purpose grade 2.
Now we have had the cardan shafts repaired and the local repairer uses Chevron Caltex Molytex Ep which has molybdenum disulphide additive.
Yet the OEM specifically recommends against molybdebum additives.
Any ideas/recommendations out there. I personally believe the OEM recommended lubricant has delivered poor results so I am tempted to go with the Caltex Molytex EP ( one sdhaft already in use with this lube)





RE: cardan shaft bearing lubrication
(less than a year?)
Are these all OEM built shafts that are failing?
what is the recommended re-lube schedule?
what is the actual re-lube schedule?
What is the failure mode?
Do you see rust dust powder collecting on the guard inline with the joints a while before the failure?
Why does the OEM recommend against moly? How about other EP type additives?
(once upon a time an SKF application engineer stated that moly creates a thin but measureable layer on surfaces)
How much parallel offset misalignment exists between the input and output shafts?
Has anyone done a torsional analysis?
RE: cardan shaft bearing lubrication
RE: cardan shaft bearing lubrication
Mike Halloran
Pembroke Pines, FL, USA
RE: cardan shaft bearing lubrication
Are these all OEM built shafts that are failing? Yes
what is the recommended re-lube schedule? 6 months
what is the actual re-lube schedule? 3 months
What is the failure mode? Total destruction of one UJ usually diagnosed as lack of lubcrication
Do you see rust dust powder collecting on the guard inline with the joints a while before the failure? No
Why does the OEM recommend against moly? How about other EP type additives? Not established reason yet
(once upon a time an SKF application engineer stated that moly creates a thin but measureable layer on surfaces)
How much parallel offset misalignment exists between the input and output shafts? This has been covered. There does appear to be sufficient to allow sufficient movement and rotatio n of the needles in the bearings (Hopefully)
Has anyone done a torsional analysis? Not sure what that is? Please elaborate.
Many thanks for the response, please see my replies.
RE: cardan shaft bearing lubrication
http://www2.dana.com/pdf/IJ900-02.pdf
RE: cardan shaft bearing lubrication
"What is the failure mode? Total destruction of one UJ usually diagnosed as lack of lubrication"
This one has lots of internal rust on 2 dried out caps, and the other bearing journals still a little greasy but etched and maybe dented
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The journal surfaces still look pretty good on this one.
http://128.83.80.200/TACO/grenade.jpg
http://www.todaystrucking.com/images/rr_3272-2.pdf
RE: cardan shaft bearing lubrication
RE: cardan shaft bearing lubrication