89 740 lumbar support

My driver seat lumbar adjustment knob just spins. I was sitting in the seat
when I heard a pop and the lumbar when back in. How would I repair the knob
so that the lumbar support is functional?

Thanks
Rob
89 745 GL

 

With a little ingenuity and a bit of hard work. The problem is that a metal clip
breaks on one side or the other thus releasing the tension on the nylon(?) belt
that is the lumbar support. IPD in Portland, Oregon sell repair kits for the
lumbar support which work well (about $US50) but I repaired the one on my 760 by
using two heavy gauge plastic straps to anchor one side of the belt to the seat
frame. Undoing the very heavy gauge wire clips, at the bottom rear of the seat,
is an arduous task and can lead to cuts of the skin on your hands and fingers,
so if tackling the job yourself protect any exposed skin/flesh on your person.
The back of the seat can be rolled up when the clips are undone, exposing the
mechanism and enabling your assessment of the job in hand.

Whichever method you choose the seat clips have to be undone and have very sharp
ends.

All the best, Peter.

: My driver seat lumbar adjustment knob just spins. I was sitting in the seat
: when I heard a pop and the lumbar when back in. How would I repair the knob
: so that the lumbar support is functional?
:
: Thanks
: Rob
: 89 745 GL
:
:

 

From a point at sea, to the circles of your mind, this is R Zych:

It is possible. You need to remove the seat and separate the
back-support from the base. You will see underneath the back-support
how the seat covering is secured - closed with small steel loops that
need to be prised open to release the covering.

Once inside you will find that the lumbar tensioner simply tightens up
a strap that goes across the back-support. On mine, the fitting at the
end had sheared. I repaired it by lashing it together with strong
nylon twine. It may be that on yours something else has broken, so you
may have to be inventive.


--

Stewart Hargrave

A lot faster than public transport


For email, replace 'SpamOnlyToHere' with my name

 

I always cut the metal clips with heavy diagonal cutters, then replace them
with nylon zip ties, it's easier than trying to unbend and remove them.

 

In addition to that clip, there is a plastic screw that the knob pulls
on that sometimes breaks. From what you say I think this is your
problem. However, either part is quite cheap from the dealer, the clip
is sold separately, the plastic screw comes with the assembly which
includes the clip. Have one on hand before starting the repair.