Forum Discussion
DWeikert
May 30, 2016Explorer II
Reinstalled the rear HJ motors that came back from being rebuilt after motor seizures. I don't remember if it was there when they went out but these came back with a stiff rubber o-ring where the motor slides over the jack leg.
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I'm guessing HJ did this to address their water intrusion problem, though the problem is water getting into the jack motor, not the jack leg. The top of the jack fits into a recess in the motor head but this o-ring completely fills that recess and even with my 6'2" 250lbs bearing down on the motor, I could not compress the o-ring enough for the screw holes to align. The hole on the rear was even worse.
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Without the o-ring everything aligned as expected.
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So, no o-rings. I may be wrong but the overlap without the o-ring seems like it would do a better job of stopping water intrusion than an o-ring that spaces the motor housing off the jack tube such that there is a gap instead of an overlap, that's assuming I could get the screws started...
I also noticed with the motor engaged I was able to turn the hand crank and manually turn the motor. It's easier if the jack is off the ground slightly so you're not trying to lift the camper and turn the motor. Next time I have a motor seize I'll see if I can unseize it that way.

I'm guessing HJ did this to address their water intrusion problem, though the problem is water getting into the jack motor, not the jack leg. The top of the jack fits into a recess in the motor head but this o-ring completely fills that recess and even with my 6'2" 250lbs bearing down on the motor, I could not compress the o-ring enough for the screw holes to align. The hole on the rear was even worse.

Without the o-ring everything aligned as expected.

So, no o-rings. I may be wrong but the overlap without the o-ring seems like it would do a better job of stopping water intrusion than an o-ring that spaces the motor housing off the jack tube such that there is a gap instead of an overlap, that's assuming I could get the screws started...
I also noticed with the motor engaged I was able to turn the hand crank and manually turn the motor. It's easier if the jack is off the ground slightly so you're not trying to lift the camper and turn the motor. Next time I have a motor seize I'll see if I can unseize it that way.
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