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Still Yet Another 6.9 Won't Rise Thread - after hanging 9 months

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raueda1:
Here’s yet another 6.9-raising thread.  I didn’t append to the other one cause the circumstances are somewhat different and the usual tips may not apply.  In my case the car has been hanging on a lift for the last 9 months.  That’s the exact opposite of the usual scenario of sitting bottomed-out for months or years, so maybe remedies are different.  Here’s the story:

I just replaced the front and central accumulators.  I tried to replace the rears but couldn’t find them (got wrong ones twice) and so just put the old ones back.  As far as I know they are OK.  When first starting the car pretty much everything leaked  to some extent.  After tightening up in one place another leak would reveal itself.  Several fittings just weren’t tight enough.  All that got fixed and the pump seems to be working fine.  Anyway, I can’t get the damn thing to rise (sound familiar?).   Here’s what happened:

1.   I topped off fluid before starting and directed the pump back into the tank to prime it.  That went OK.
2.   Reconnected pump to get the car up.  No luck, and I lost a lot of fluid to the leaks per above.
3.   Added more fluid (all I had left).  After a spell the front went up, but the back didn’t. 
        Oddly, the front seemed to go extremely high.  The level switch didn’t have any effect on anything.  The rear isn’t rising. 
4.   I tried going around and bouncing corners and all that.  No effect.
5.   Recall that the car is on a 4 point lift.  Per Rumb’s point on that the height needs to be within the range
        of the leveling valve, I swung the front lift arms out so just the rear was on the lift.  Hence I could
        vary the rear height by raising/lowering the lift a tiny bit.    After varying the rear height from bottomed-out to
        quite high, I still couldn’t get the rear up.
6.   Level switch still has no effect regardless of how high or low the rear is.

That’s where I am right now.  I do know fluid is still low, more is on the way.  Exactly how low I’m not entirely sure.  I won’t do more till I’m 100% sure that fluid level is right.  In the meantime maybe you suspension gurus have a few more ideas for when the fluid arrives in a day or so.  Thanks as always!

[sidebar comment: It’s so damn hard to read the damn dipstick!  The fluid is almost water-thin, colorless and doesn't really form a meniscus on the dipstick.  The only way I can really do it is to make sure the notches are absolutely dry, insert it and see it they’re wet in the notch.  They really should use a dye in that stuff, no excuse not to.  I'm going to play with that.]


daantjie:
Dave yes might just be low fluid or air in the system.  It should self purge the air over time whilst running.  Take a strong flashlight and shine into the tank to see where the level is at.  You might be very low and the pickup is raised above the floor of the tank to avoid debris entering the system.  So if you see the level very low then for sure you need to add.

raueda1:

--- Quote from: daantjie on 01 June 2020, 08:35 AM ---Dave yes might just be low fluid or air in the system.  It should self purge the air over time whilst running.  Take a strong flashlight and shine into the tank to see where the level is at.  You might be very low and the pickup is raised above the floor of the tank to avoid debris entering the system.  So if you see the level very low then for sure you need to add.

--- End quote ---
Turns out I was low. But it didn't matter, topping off didn't help.  Neither did running engine with the control in al it's respective positions, including "S".  S dropped the front, which immediately went extremely high in the N position while the rear remained bottomed out.

I'm now wondering if the leveling valves got cocked up somehow.  I'm toying with the idea of disconnect their arms so they can be moved by hand through their range.  Does this make any sense?  FWIW, while the car was suspended for 9 months the wheels were off so there wasn't much weight on the anything.  This is getting frustrating.  I've never had suspension issues that weren't quickly solved nad it all worked fine before going on the lift!

daantjie:
Maybe try bleeding the pump.

rumb:
I would be concerned disconnect the arms, if you have it in fill there is nothing to stop it from filling more once it reaches it's limit.

Since front raises, I would put 4 tires on ground, let front raise and then pull up rear / jack up  and then alternate down and up positions.  I think it is just a matter of time until the rear purges air and thing start working.

Does the red warning light turn off yet?

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