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Changing Hydraulic Fluid in convertibles with automatic tops

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Changing Hydraulic Fluid in convertibles with automatic tops

Post by 69_RAG_TOP on Wed Jun 02, 2010 11:15 pm

If you are having problems with your automatic convertible top such as slow to rise, leaking fluid, not opening or closing in full, then you may want to change your hydraulic fluid. If you have a leak you may need replacement hydrulic cylinders.

If your top still doesn't go all the way closed, you may want to refill the pump. You may try to open the pump reservoir and disengage the cylinder arms from the top and cycle them back and forth. Then make sure you fill up the reservoir with hydraulic fluid. The 1969 Fisher Body Pontiac Service manual states to fill the reservoir unit with Dexron or Type "A" transmission fluid. The Chevrolet Service manual for first gen Camaros states use either Hydraulic fluid or ATF. On a refilled system I used Dexron®️ ATF. I would check your service manual and use what ever matches what is in the system. You can remove the plug from the pump and inserted a clear 1/2" rubber hose into a bottle of ATF. The important thing is to have your ATF sitting below the pump. As you turn the switch up and down, fluid will be pulled into the lines and air will release back into the pump where it escapes through the plug opening and you can get rid of almost all of the air. The top off the pump with fluid to the plug level. You should use about 48 ounces of fluid.

Get your motor runnin'. Head out on the highway Lookin' for adventure. And whatever comes our way. 1978 Pontiac Trans Am WS6, W72 Engine. bored .030 over Coded WC, 4-speed, Forged rods, pistons, 6X Heads Hays performance clutch, Flowmaster 40 Series 3" stainless dual exhaust, Hooker super competition, Ceramic coated long tube headers, 4 core HD radiator, Edelbrock Performer Series Carb
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Re: Changing Hydraulic Fluid in convertibles with automatic tops

Post by mr71transam on Thu Jun 03, 2010 7:49 am

Great Info, Thnaks for the Post.

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