Happijac lubrication
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Forum Discussion
There is something I don't quite get about the clinch spring. Can someone help me out with my thinking?
It seems to function in one direction to tighten down on the cyclinder that mates against the square thrust plate? The added friction of the cyclinder against the plate then adds resistance to prevent the worm gear from freewheeling under the weight of the camper and slowly lowering the jack? So in this case it would seem that friction is good and little lubricant would be a good thing and that is why there is no needle bearing there.
When turning the gear to raise the camper, the spring would unwind and the cyclinder would not rotate. However when turning the gear to lower the camper the spring would lock tightly and spin the cyclinder against the square thrust plate. With no or little lubrication, gauling of the parts would occur in this direction.
So if you lubricate it really well, it may freewheel? If you don't, it gauls and won't rotate in one direction. Then when the roller needle bearing fails it gauls in both direction without lubricant. Do I have this right?
To put this is perspective, has freewheeling been a problem for people who have rebuilt their jacks and heavily greased the mating faces of the square thrust plate and the cyclinder?
It would seem that with electric motor driven jacks, there is added resistance to freewheeling vs. the manual jacks.
Seems I've read more gauling, noisy, locked up jacks vs. freewheeling jacks and collapsed campers. Does this reflect the relative value / risk cost of jacks vs. cost of camper.
It seems to function in one direction to tighten down on the cyclinder that mates against the square thrust plate? The added friction of the cyclinder against the plate then adds resistance to prevent the worm gear from freewheeling under the weight of the camper and slowly lowering the jack? So in this case it would seem that friction is good and little lubricant would be a good thing and that is why there is no needle bearing there.
When turning the gear to raise the camper, the spring would unwind and the cyclinder would not rotate. However when turning the gear to lower the camper the spring would lock tightly and spin the cyclinder against the square thrust plate. With no or little lubrication, gauling of the parts would occur in this direction.
So if you lubricate it really well, it may freewheel? If you don't, it gauls and won't rotate in one direction. Then when the roller needle bearing fails it gauls in both direction without lubricant. Do I have this right?
To put this is perspective, has freewheeling been a problem for people who have rebuilt their jacks and heavily greased the mating faces of the square thrust plate and the cyclinder?
It would seem that with electric motor driven jacks, there is added resistance to freewheeling vs. the manual jacks.
Seems I've read more gauling, noisy, locked up jacks vs. freewheeling jacks and collapsed campers. Does this reflect the relative value / risk cost of jacks vs. cost of camper.
