Happijac 4150 problems

[@firefightershownealsnyder7228]

My front Jack was making the straining noise as I lifted my camper. Pulled the truck out from under camper, checked my level to be sure I was still good and level hit the all down and crack… front passenger side Jack went up inside and camper nose dived onto the box of my truck. Tore off both front jacks in the fall and severely dented my truck bed. DO NOT WAIT to replace or service a straining Jack. I replaced both front jacks. Makes a big mess of the camper attachment points and the truck. Fork lift with 8’ forks to get camper off the truck and back into truck bed so I could get home.

[@ericben-kiki451]

Hi Neil, Just saw this vid... A couple of weeks ago (memorial day 2024) a happyjac strut failed on me when I was leveling out our truck camper (with chuck and drill). A front one. When I say failed' it just gave way and the whole camper started to tip over but fortunately stopped before going all the way over (on me by the way!) scared the shit out of me. If the jacks had been fully extended, then that camper would definitely have rolled over and dinner would have been on the ceiling. I think your video is exactly what happened. The threads stripped out. Ordered a 4220 Jack and have to go back to Maine to replace it to get it back on the truck.

[@markrupp7174]

Thanks Neil, Best explanation I’ve found yet.

[@JJ-rt6xe]

Thanks for the video, mine are starting to strain as well and am researching solutions and this really helped me.

[@barryr4444]

Do you have a video on how to remove the foot from the casing?

[@bloodyeyeful]

Thank you for the information. My long screws just sheared off at the top. Any idea how to get a used Jack? they're very expensive

[@hanksch]

Thanks for the explanation. Mine are getting hard to turn and the motor is straining. Hope I caught it soon enough to fix befor the threads fail.

[@a.m.v.6938]

Thank you, that does help a whole lot.

[@brentmcmahon8188]

They have some factory blems for the legs 750 bucks for two brand new ones that 3000 lb legs complete use your motor and gears and I got 4 and the four of the plastic motor base and the top and it worked out great does not kick out the motor controller that you have to unplug and plug back in to reset power. And most of your weight is on your front jacks and the front jacks are bigger than the back. I had 4150 in the rear and 4500 in the front the back ones are like 1500lbs and front ones are like 3000lbs . So good luck hope this helps .

[@garryalee2337]

My Happy jack went past the red line and jammed. How did you get the head gears off only a cotter pin can be nocked out ?

[@iankendell8607]

Did you buy replacement legs? How much were they? I have the same problem

[@neilcarroll9333]

I bought 2 new jacks. I put the new ones on the front, 2 good ones on the rear and have one as a spare. I had to order them and I believe they were around $500 each.

[@josephnagle3852]

Have one side won't go up stuck in down on one side

[@trailcamadventures]

Same problem here. The main side goes up but the non motor side struggles with gear slippage.