dragginbaet
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Re: Happijac lubrication
I had the same experience. The likely reason is the tubes are stuck is because there is a build up of rust and grit between both tubes. You are on the right track; it's a slow process. Try using a better quality penetrating oil applied from the bottom. Stand the jack upside down for hours. You may have to repeat this several times before you get results. I separated the pieces using two techniques (the trick is you don't want to hammer pieces so hard as to cause damage). 1) I locked the jack in a vise and tapped the foot of the jack to get some movement. 2) With all the gears removed you'll notice a hole at the top end. I used a piece of rebar about 1 1/2 times the length of the jack and tapped it against the inside of the foot. Once thngs start moving the effort required will decrease. Before reassembly I cleaned the tubes with acetone and steel wool. Upon reassembly I greased the running surfaces of both tubes (it's messy). The root of the problem is that the recommended lubrication method is not effective. Little to no oil gets into the tube area and over time moisture and road dust causes gunk inside the tube. Happijac owners are left with no joice but to disassemble the jacks every 2-3 years to clean and lube the tubes.1KViews0likes0CommentsRe: Happijac slow leg
Everyone who responded scores 10/10. I had a similar problem and jumped to buy a new motor. That was a mistake. The best operational fix is to be patient, run the front at little-run the back a little and tweak when necessary. Unfortunately the jack causing me the most grief had nothing to do with the motor; the bearings are NFG. The bearings on this jack are seized (4150 model) others are in poor shape. I learned a lot from this forum and can confirm that these jacks need to be dismantled every 2-3 years for cleaning and regreasing. I dismantled my set and am looking for bearings from a local shop because Happijac isn't so happy when it comes to details about the components. New jacks are $2070 online and $3000 from retailer. The bearings must be less expensive.654Views0likes0CommentsRe: Happijac lubrication
Thanks for sharing your Happijack experiences. My jacks have given me grief for a few years; really noisy, non-sychronized lifting and getting stuck. Tried to get professional service this year and all the shops are booked until the end of August. I did recieve great advice from one service provider suggesting the tube and shaft could be rusty. Then I found this forum which led me to a link for taking the jack apart. Genious. I'm on jack#1 and found a shreaded "O" ring hanging on to the screw. Looks like it came from where the screw meets the top of the leg. Can't find details regarding the size of the "O" ring. Any suggestions?1KViews0likes0Comments
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