Happijac lubrication
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Forum Discussion
wnjj wrote:jjinatx wrote:
Curiously, the 4100 jacks do not have this drag brake mechanism.
This is probably because the camper weight cannot backspin an acme thread but can backspin the recirclating ball setup. Notice how much steeper the threads are? Steeper = easier to backspin. The drag brake adds enough extra resistance that the camper will not fall while the motors can still power it down.
WNJJ,
Pardon my ignorance, but I'm not sure exactly what a recirculating ball mechanism is. The 4500 and the 4100 appear to have the same acme screw, thrust bearing and gears and are pretty much the same except for the clinch spring drag brake mechanism. Is the bottom end of these jacks, the part inside the lower leg, different somehow? Is that where the recirculating ball mechanism resides? I haven't wanted to cut mine apart until the new 4600s arrive on my doorstep.
-jj
