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Center locking diff transfer case diaphragm

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YYC.cars
Posts: 22

Center locking diff transfer case diaphragm

Post#1 » Sun Aug 18, 2019 12:10 pm

Hi guys, My diffs are not locking. I have tried on dirt roads at low speed making wide turns and nothing. I can hear the pump running, but the center lock will not engage. I have a new diaphragm to install but could use a little help on the procedure. I have read you need a "special puller"? what is it pulling? also does anyone know the socket size to get the electric switch sensor thing off, located in the center of the diaphragm housing? I am guessing 27mm or 28mm deep socket? I will have to go out and buy one would be nice to confirm the size.

thanks a ton,
Joel
2001 G500

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Chris
Posts: 3023

Re: Center locking diff transfer case diaphragm

Post#2 » Sun Aug 18, 2019 1:03 pm

27mm, yes you can’t remove the front driveshaft yoke to replace the diaphragm without the special puller.
Generic 2 or 3 arm puller may damage/distort the $300 yoke so proceed with caution.

YYC.cars
Posts: 22

Re: Center locking diff transfer case diaphragm

Post#3 » Sun Aug 18, 2019 6:16 pm

Thanks Chris,
Does anyone know where to get this “special puller” or have a part number? I would like to do this job my self as it seems pretty straightforward with the right tools. Otherwise I guess I am off to the stealership.
2001 G500

User avatar
mogwild
Posts: 3647

Re: Center locking diff transfer case diaphragm

Post#4 » Sun Aug 18, 2019 6:48 pm

Not sure if this is the right one (would need a VIN and more info) but I found this browsing, maybe Chris can say if it's the correct tool or not?
Attachments
puller_maybe.jpg
-trev

User avatar
Chris
Posts: 3023

Re: Center locking diff transfer case diaphragm

Post#5 » Sun Aug 18, 2019 8:13 pm

Yes, that’s the puller, that other tool is also needed now that I think about it.

$230 in tools.

YYC.cars
Posts: 22

Re: Center locking diff transfer case diaphragm

Post#6 » Fri Aug 23, 2019 4:41 pm

Ok I am a little lost, still looking to replace the diaphragm in TC (part 23 in photo) looks easy as can be. I can get the 6 bolts off no problem. But part 50 seems to be a 9 sided bolt and about 27mm. I thought it was 27 or 28mm 6 sided socket but not the case. How do I remove part 50? Is this where the “special puller” is used? I assume it’s the switch that tells the computer that the center diff is locked.
Let me know what you guys think.
Attachments
9A0FBDCC-D337-4FBC-A9E3-2C9566BA8E96.jpeg
2001 G500

YYC.cars
Posts: 22

Re: Center locking diff transfer case diaphragm

Post#7 » Fri Aug 23, 2019 4:47 pm

Vin# WDB46324117114051
2001 G500

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AlanMcR
Posts: 4283

Re: Center locking diff transfer case diaphragm

Post#8 » Fri Aug 23, 2019 6:35 pm

Not as easy as it looks. One of the shaft flanges has to come off in order to get the cover off. It looks like it might clear, buy it won't. I did not use the special puller, in fact the flange came off relatively easy. Make sure you mark the flange position on the shaft.
...Alan

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mogwild
Posts: 3647

Re: Center locking diff transfer case diaphragm

Post#9 » Mon Aug 26, 2019 1:47 pm

Some reading:
Attachments
Remove shift cylinder.pdf
(33.6 KiB) Downloaded 6 times
Remove_install shift mechanism differential lock.pdf
(48.61 KiB) Downloaded 4 times
Disassemble_assemble transfer case.pdf
(69.13 KiB) Downloaded 4 times
-trev

User avatar
mogwild
Posts: 3647

Re: Center locking diff transfer case diaphragm

Post#10 » Mon Aug 26, 2019 2:16 pm

Sorry, Editing expired, try this document:
Attachments
flange.jpg
Removing coupling flanges.pdf
(30.18 KiB) Downloaded 3 times
-trev

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