Power seat back tilt doesn't move, although the hydraulic motors engage.

Asked by Apr 17, 2017 at 09:28 PM about the 1995 Oldsmobile Ninety-Eight 4 Dr Regency Elite Sedan

Question type: Maintenance & Repair

Oddly, both left and right are doing the same thing... nothing.  It is not
electrical as both hydraulic motors engage.  More like the gear or shaft they
drive is stuck.  I'm certainly no expert, but catch on quick.  Just need a hint.  
Also, if some of the hydraulic fluid has leaked out, what kind is it, and how do
you charge it.  There appears to be a small fitting on the back end of the
motor, I would assume is a grease fitting.

2 Answers


Probably low on hydraulic fluid. There should be a reservoir somewhere - probably in the trunk. I am guessing the rams are leaking so you probably need to have them rebuilt.

I will look for a reservoir... didn't know they shared one. I should probably have mentioned that all the other hydraulic motors are working fine. There are four under each seat. It is only the one responsible for the seat back tilt that is stuck. Of course, is has the largest load on it as well, as the gear mechanism seems to be a long rod with sort of a worm gear on one end. Keep in mind this is me looking upside down with a flashlight, no manual.

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