Chevy SSR Forum banner
  • Hey everyone! Enter your ride HERE to be a part of this month's Ride of the Month Challenge!
1 - 6 of 6 Posts

·
Registered
Joined
·
2,454 Posts
Discussion Starter · #1 · (Edited)
As many of you know, I have had my fair share of trouble on #856, 03 SSR, especially with the roof. My guy John at Priority has been a virtual saint and has the patience of Jobe. He recently installed my new hinges for the top and it does operate, however, there is still one very big problem. The tonneau cover opens higher on the passenger side and lower on the driver side. In other words, the tonneau is lifting diagonally and there are now scratches and rub marks of significant size on the passenger side as a result. I was looking at my GM Service manuals (which I should have taken with me today but did not) and they show the Roof Door Module (RDM) controls the amount of pressure that goes to the cylinder to move the tonneau in whatever direction it should go. It seems to me from what I have read in the tech. Helms service manual, that the RDM simply needs to be reset or else there is a very small leak somewhere in the system. I plan on dropping off my manuals for John to look through for a few days and try to identify the problem and then letting him have a shot at adjusting the top again to get her going right. Interestingly, after 3 or 4 roof cycles, she goes up evenly, indicating that pressure is built up after a few cycles. Any of you guys in the factory that may be reading this, or someone that is in the know mecanically with hydraulic systems, we sure would appreciate some feedback to resolve my roof problem. The helms manual sure has an awful lot of pages just on the roof!!!! :confused
also, John looked everywhere for a leak and none could be found. I have yet to find the master cylinder locks for the hydraulics in the manual. They are apparently in the rear wheel fender walls and require some disassembly of the vehicle to access them. Perhaps one of them is leaking?
 

·
Registered
Joined
·
1,502 Posts
Dosen't it seem odd to be loosing so much fluid without stains showing up somewhere?

You wounldn't be brewing some strange jungle juce would you? :party
 

·
Registered
Joined
·
2,454 Posts
Discussion Starter · #3 ·
I got my SSR in Nov. of 2003 and have been putting the top up and down a lot. Over time, a very small leak may not actually be evident. It does not take much to decrease the pressue in the lines somewhat. HOpefully John will find the problem.
 

·
Enjoying life as it comes
Joined
·
5,210 Posts
1 Of 2

You may have one of two things going on there. 0pting out the external leak.

One being some air in the system, which will compress at a different rate and allow loss of pressure after non use.

Two being a check valve not seating properly in the valvle block.
I haven't looked very closely at this system yet, seeing as how I don't have a hydraulics schematic for mine. With a little effort and a little reading I'm sure there is a solution.
 

·
Retired GM Program Manager/ Chief SSR Engineer
Joined
·
549 Posts
The RDM does not control the pressure of the hydraulics. It just turns things on and off. The hydraulic pressure is always at max (1500 psi). The cylinders and mechanicals are sized to produce the appropriate force. Each Tonneau cylinder sees exactly the same pressure at exactly the same time. If they do not act the same, then there is some mechanical (friction for example) or hydraulic issue (air in the line or a kinked line). There can be leaks that are not visible. These would come from the tonneau lock cylinders which are inside the quarter panels. The small amount of fluid would leak out of the bottom of the quarter panel and might not be noticed. The cylinders are attached to the tonneau locks and can be checked by removing the lock mechanism. These bolt in from inside the top storage area. You can see the hydraulic hoses go through the lock plate.
 
1 - 6 of 6 Posts
Top