lumbar pump repair - ZR-1 Net Registry Forums

MarvinE255 · 01-06-2006

In the past there were many posts on the ZR-1 net on how to repair the lumbar pumps using a piece of rubber glove. Need help in locating the repair proceedure or a description of the method. Thanks Doc

We Gone · 01-06-2006

Here ya go..did my 90 works good as long as the bags and fittings are good...This came from Corvette Forum under the C4 tips..

This tip provides additional information to the Tech Tip "FIXING YOUR C4 SPORT SEAT LUMBAR SUPPORT" authored by Bob Thibodeau on 6/15/2001. 1. An alternative source for material to replace the ruptured diaphragm is a bicycle inner tube. It is much thicker than the original diaphragm, and should provide longer "life". To prepare the tube, cut a square about 2" X 2". Locate the center of the square by intersecting the lines from each corner. This will provide the location for the center screw. If the screw is off center, you will develop a "rolling pulsation" , which is not as efficient as a "verical pulsation". 2. Using a compus placed at the center mark, draw a circle 11/4" in diameter. Cut out your circle precisely, and now you have your diaphragm replacement. 3. The pump is held in positon by three bolts. The heads of the bolts are located under the seat, and the nuts are recessed on the top, which requires removal from the under side of the seat. 4. When reinstalling the pump, it is recommended to replace the bolts with screws and self locking nuts. Installing the screws from the top will allow you to use a screw driver for ease of installation. I found that when using self locking nuts, only two were required to sufficiently fasten the pump to the seat. With the "inner tube" replacement diaphragm, I am able to compare pump production with the original diaphragm in the passenger seat. The inner tube diaphragm provides a more rapid inflation of the lumbar bladder.

WB9MCW · 01-06-2006

We gone u are so resouceful!!! Good going!!!

MarvinE255 · 01-07-2006

Thanks for the info. Doc

Z Factor · 01-07-2006

Welcome Marvin

, glad to see you posting.

WB9MCW · 01-07-2006

yes welcome.... mr marvin!!

evl_twn · 08-19-2006

I've got an intersting problem/question. My lumbar pump works fine, and all three center bladders are working. The problem I have is one of the side bolsters doesn't work. I've had the seat base off, and swapped the hoses so it's not a problem with that particular "port" under the seat, but a problem with the line/bladder itself. Any thoughts on the best way to tackle this? How hard is it to get to the "guts" of the seat and see what's happening?

We Gone · 08-23-2006

Side bolsters are electric.. You will have to pull the upper center section of the seat out.

evl_twn · 08-23-2006

Even on the sport seats on a '94? Looked like air tubes going to both sides, and only one side works. I swapped the connections, so it's not that "port" on the under seat unit, it's in the seat itself.

We Gone · 08-23-2006

Quote:

Originally Posted by evl_twn

Even on the sport seats on a '94? Looked like air tubes going to both sides, and only one side works. I swapped the connections, so it's not that "port" on the under seat unit, it's in the seat itself.

Well you got me on that one I know they are up to 93..and on my 04..I'll look in the parts book when I get home.

OK, you are right the book shows bladders for the sides on the newer style seats. The older ones are powered by an elec. motor.

Steve

01-06-2006	#1
MarvinE255 Join Date: Jul 2005 Location: Florida Posts: 3	lumbar pump repair In the past there were many posts on the ZR-1 net on how to repair the lumbar pumps using a piece of rubber glove. Need help in locating the repair proceedure or a description of the method. Thanks Doc

01-06-2006	#2
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,170	Re: lumbar pump repair Here ya go..did my 90 works good as long as the bags and fittings are good...This came from Corvette Forum under the C4 tips.. This tip provides additional information to the Tech Tip "FIXING YOUR C4 SPORT SEAT LUMBAR SUPPORT" authored by Bob Thibodeau on 6/15/2001. 1. An alternative source for material to replace the ruptured diaphragm is a bicycle inner tube. It is much thicker than the original diaphragm, and should provide longer "life". To prepare the tube, cut a square about 2" X 2". Locate the center of the square by intersecting the lines from each corner. This will provide the location for the center screw. If the screw is off center, you will develop a "rolling pulsation" , which is not as efficient as a "verical pulsation". 2. Using a compus placed at the center mark, draw a circle 11/4" in diameter. Cut out your circle precisely, and now you have your diaphragm replacement. 3. The pump is held in positon by three bolts. The heads of the bolts are located under the seat, and the nuts are recessed on the top, which requires removal from the under side of the seat. 4. When reinstalling the pump, it is recommended to replace the bolts with screws and self locking nuts. Installing the screws from the top will allow you to use a screw driver for ease of installation. I found that when using self locking nuts, only two were required to sufficiently fasten the pump to the seat. With the "inner tube" replacement diaphragm, I am able to compare pump production with the original diaphragm in the passenger seat. The inner tube diaphragm provides a more rapid inflation of the lumbar bladder. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

01-06-2006	#3
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: lumbar pump repair We gone u are so resouceful!!! Good going!!! __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln

01-07-2006	#4
MarvinE255 Join Date: Jul 2005 Location: Florida Posts: 3	Re: lumbar pump repair Thanks for the info. Doc

01-07-2006	#5
Z Factor Join Date: Dec 2003 Location: S. Florida Posts: 2,667	Re: lumbar pump repair Welcome Marvin , glad to see you posting.

01-07-2006	#6
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: lumbar pump repair yes welcome.... mr marvin!! __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln

08-19-2006	#7
evl_twn Join Date: Jul 2006 Location: Tennessee Posts: 116	Re: lumbar pump repair I've got an intersting problem/question. My lumbar pump works fine, and all three center bladders are working. The problem I have is one of the side bolsters doesn't work. I've had the seat base off, and swapped the hoses so it's not a problem with that particular "port" under the seat, but a problem with the line/bladder itself. Any thoughts on the best way to tackle this? How hard is it to get to the "guts" of the seat and see what's happening?

08-23-2006	#8
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,170	Re: lumbar pump repair Side bolsters are electric.. You will have to pull the upper center section of the seat out. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

08-23-2006	#9
evl_twn Join Date: Jul 2006 Location: Tennessee Posts: 116	Re: lumbar pump repair Even on the sport seats on a '94? Looked like air tubes going to both sides, and only one side works. I swapped the connections, so it's not that "port" on the under seat unit, it's in the seat itself.