I have a Bigfoot with Happijacs. One of them keeps blowing the fuse. The jack moves freely when manually cranking the jack. Do any of you know if all the jacks use the same drive motor assembly? I have 4500 series jacks on mine, and I am looking to replace the bad one. I don't know for sure what the part number would be. I have found 600510. Will that work?

Have a look at the front of this section in Truck Campers under Truck camper University. Go way down to the section on Camper Jacks and look in there. There is complete take apart and lubricate instructions, parts lists, etc available there.I took apart and lubed all four of my jacks in a day.. first one was 3 hours careful... by the fourth it only took an hour. I came up with a rig into my battery drill so that I could run the screw up and down with one hand as I applied grease lube to the threads. Check it out, hope you find your answers.

Thanks for the reminder Artum. I have read through the jack section and there is excellent info there. The one topic not discussed is the drive motor system itself. I suspect all the Happijac motor drives are the same as they appear to be the same from model to model. The ones on my 4150's look and run just like the ones on my 4500. I would just like for someone to confirm.

On my prior bigfoot, 4500 jacks were fitted to the front and 4150 to the back. They had the same motors.

Make sure you inspect the wiring all the way from the drive motor all the way back to the controller. Look for damage to the wiring and feel the harness for where there could be breaks in the wire or where the manufacturer put in splices in the wire.You could have a short in the windings of the motor - but you could also have bad wiring going between the controller and the motor.I got messed up on one of my jacks due to a bad splice. The wire from the motor one the jack was connected to two wires with wire nuts. Then 6" down that wire they had spliced the wire again and covered the entire length with electrical tape down to where the plug goes into the back of the camper. The splice they had hidden with tape (and it was a horrible splice) was hidden well and was causing me problems to the point I thought I had a bad motor. I found the bad splice only after a very close inspection of the cable.If you have a volt/ohm meter and know how to use it, test the wiring first. If you dont have a meter or dont know how to use it, find a friend who knows how to do low voltage electrical work and have him help you test it. It might just save you the cost of buying something you dont need.

I replaced both 4500 motor heads 3 months ago. Both were front jacks on camper,full of water and rust. Happi jac said the seal goes bad on motor covers. Motors kept blowing fuses,rear jacks were fine. No problems with jacks,just motors. I keep them all covered when possible! Part number I have is182515Bob

Happijac motor drive | Good Sam Community

23 Replies

HMS_Beagle
Explorer
Dec 12, 2015
On my prior bigfoot, 4500 jacks were fitted to the front and 4150 to the back. They had the same motors.
racedrvr
Explorer
Dec 12, 2015
Thanks for the reminder Artum. I have read through the jack section and there is excellent info there. The one topic not discussed is the drive motor system itself. I suspect all the Happijac motor drives are the same as they appear to be the same from model to model. The ones on my 4150's look and run just like the ones on my 4500. I would just like for someone to confirm.
Artum_Snowbird
Explorer
Dec 12, 2015
Have a look at the front of this section in Truck Campers under Truck camper University. Go way down to the section on Camper Jacks and look in there. There is complete take apart and lubricate instructions, parts lists, etc available there.

I took apart and lubed all four of my jacks in a day.. first one was 3 hours careful... by the fourth it only took an hour. I came up with a rig into my battery drill so that I could run the screw up and down with one hand as I applied grease lube to the threads.

Check it out, hope you find your answers.

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Happijac motor drive

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