Forum Discussion
gfemling
Jun 08, 2013Explorer
gfemling wrote:69 Avion wrote:
Fortunately all of mine were able to be cleaned up. I ran some Breakfree in them and worked them for a while until the 45 years of gunk came out and then I cleaned the outside and painted them. I really think that you need that bearing in order to reduce friction. I would have suggested calling Cayo, but they claim that these jacks never came on our campers. My next guess is to take a bearing down to one of the large bearing companies and see if they can match it. I'll bet that they are still available, you just need a make and number. I didn't see any numbers on mine. I looked for numbers just in case I needed new ones. Let us know what you find out.
I was able to read the bearing make & model off the original and did try to have both NAPA and a major bearing supplier cross the numbers but no good. (I don't remember what the make/ numbers were right now and on-the-road so can't refer to my notes) Anyway, yes the drag gets pretty large when my stacked thrust washer assembly gets dry so agree that having good roller thrust bearing is important-- now just need to find where to obtain-- anyone out there have some ideas??
OK back home and dug up the numbers on the original thrust bearings-- NICE 7299 USA (assume they were from a domestic manufacturer-- NICE?; that the "USA" isn't part of part number also as it is on opposite diameter from other part number). The bearing appears to be a sealed roller thrust type with ID measured at 1.013" (1" nominal), OD measured at 1.570" (1 9/16" nominal), and thickness measured at 0.300" (5/16" nominal). Appears from examination that all of these dimensions are critical-- ID to fit over threaded shaft without excessive clearance; OD to allow crank handle spur gear clearance-- any larger OD and side gear won't slide onto the side shaft enough to mate with other spur gear on the threaded main lift shaft; thickness critical to allow proper engagement of two mating spur gears.
Anyone have any ideas; searched the suggested VXB.com without success.
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