I have found a
good way to repair UltraFab levelers that pull the motor mount
studs out of the base of the jack.
1
This is what the completed jack looks
like after repairs have been made. The original problem is that
the black plastic drive unit pulls (1) away from the top of the
silver plate that is the drive plate (6) on top of the jack leg.
This is caused by the drive pin (5) inside the unit breaking and
exerting a lifting force on the drive unit. This force pulls the
mounting studs (4) from the jack leg causing the drive unit to
rise and the broken drive pin to disengage.
2
To remount the unit you have to find
a way to re-secure the drive unit (1) to the jack leg (6) and keep
it there. The first problem is that the rear bolts are actually
inside the jack leg. You will have to grind enough of a space in
the jack leg to allow you to insert a nut. I used self locking
nuts.
3
You will either have to cut the bolts
to the exact length you need (or they will run into the jack leg)
or you can leave them a bit long and use an adjusting nut on the
top to tighten the assembly once the lock nut is fully engaged
with the lock nut. Make sure to use washers or the plastic will
soon start to gall.
4
This is one of the four mounting
studs that serve to keep the drive unit (1) from turning on the
jack leg (6) and to secure the two together. The stud will have to
have the internal threads drilled out so that it will slide over
the new mounting bolts (7) and slip back into the holes in the
jack leg.
5
This is a pair of the drive pins, the
bottom one is an intact pin and the one in three pieces is one of
the three I have had break.
6
This is the top of the jack leg. The
four holes you see are the ones that the mounting studs have
pulled out of. You can see the difference in the hole locations
making the rear ones difficult to work with. The slotted shaft in
the center is what the drive pin (5) engages with to raise aln
lower the jack.
7
As the mounting studs (4) are no
longer welded to the jack leg (6) they are free to ride up on the
bolts allowing the drive unit (1) to turn back and forth on the
leg. In order to keep the mounting studs fully engaged in the jack
leg you have to keep them pressed down. I did this with lengths of
copper tubing slipped over the bolts. The length is critical, they
must force the mounting stud firmly into the jack leg holes but
not interfere with tightening the drive unit to the jack leg.
8
This is the home of the culprit, the
drive pin. It can be seen inside the central gear sleeve and
extending to the drive gear's internal notches.
Contact UltraFab
for assistance or to order a replacement drive pin.
ultra-fab.comThey are a great
help.
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