I understand you have not noticed any mechanical /noises the way the motor works.
Is this click after applying regen brake /after releasing brake lever/ still the same ? Or is it louder?
I would pay more attention to lubricate bearings if I rode in winter.
Bearings on EPLUS are high quality sealed Japanese ones just like on Tidal Force bikes, but I still lubricate them.
I place EPLUS on its side ,squirt 5 droplets of Mobil 1 motor oil to the centre of motor and next I rotate wheel to allow oil to flow down.
I do it on both sides of EPLUS.
High quality full synhetic Mobil 1 is one of the best if not the best motor oil in the world. It not just lubricate but also seals your EPLUS hub center from moisture penetration.
I know EPLUS motor stands out of many DD motors , because its mechanical design /example wires do not enter through axle like in your typical cheapo China brand but through individual holes in stainless steal solid centre hub/
but still few squirts of such fully synthetic oil from both sides keeps both sides centres oily - very good.
I'm not positive but I wouldn't use Mobil1 for a bearing (I do use it in my car) It is engine lube and even though engines may have two main bearings these are toleranced and engineered to run in an oil bath and Mobile 1 is engineered to be a bath in a gas engine for piston rings, high temps & etc and is not designed for a dry bearing. A bearing should have a thicker grease specified for this application to stay in the bearing for the long term. If I suspected the original grease was dry or displaced I would give it squirts of Triflow teflon lube twice a year. I think the Mobile 1 will just be pushed out of the bearing races soon and leave it dry and very vulnerable. Again, Mobile 1 is an engine lube and may not be optimal for a dry bearing. Bones makes lubes for skateboard bearings that are a thicker cream meant to remain in the bearing but skateboarders and rollerbladers want speed and very low rolling resistance so they use light greases ("cream").
I would consider taking the bearing seal off on the inside of the motor because it is clean in there and doesn't need the seal. With the seal off I could spray-clean the bearing with bearing cleaner or even WD-40 (as a cleaner NOT as a lube--it is a very light weight lube for some non-critical things) and then after it dries apply a thicker teflon grease which would last. Taking the inner seal off on the inside of the wheel has been done millions of times on skate boards and some top of the line bearings even come without a seal on one side for skateboards and rollerblades for this purpose. Campognolo and other companies make bicycle bearing lubes but these are often for racing and they get renewed regularly--not left for 11k miles.
I agree that after 11,000 miles some lube should be added and bearings should be cleaned. One could replace them but I'd look into the price for this size as some odd sizes can be expensive and sometimes require a press to get them in and out as they must be completely seated. Good grease can substantially prolong the life of a bearing. Some greases are intended to stay in place and last long in this application. This particular bike is carrying a lot of weight but all of our ebikes have more load than a bicycle.
It would be nice for a dry bearing engineer to chime in with info for all our ebike bearing maintenance needs.
Last edited by nimbuzz; 01-06-14 at 06:58 AM.
I can see your point, especially about that oil can be thown out of bearings.
everthing depends...how often you do it and for what weather conditions.
I want this oil to splash and lubricate also metal seals, snap rings and get it inside motor and
I don't do it once in a season, more often than that. I squirt untill it flows out.
Kris King /golden standard in bicycle parts - the best/ manufacturer actually recomends motor oil for lubrication for its expensive hubs in certain weather conditions.
Check this out
page from CHRIS KING manual.
My comment above was about riding in winter.
Here what KRIS KING says about lubrication of its sealed bearings built into front hub.
They do mention Tri-flow lubricant. 002.jpg