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91 XJS V12 Convertible Top Hydraulic Pump Question

XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

91 XJS V12 Convertible Top Hydraulic Pump Question

 
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Old 04-24-2019, 04:40 PM
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Default 91 XJS V12 Convertible Top Hydraulic Pump Question

I need to top off the hydraulic fluid for my top, as it's low and running slow. I doubt it's ever been serviced. Anyway, how does the cap to the fluid resevoir unscrew? Is it with an Allen wrench?
 
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Old 04-25-2019, 11:41 AM
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Not sure, but you will need special fluid. Do not use atf.
 
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Old 04-25-2019, 12:51 PM
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I looked more closely, I believe a hex key/Allen wrench, removes the cap to the resevoir. I also plan on using Pentosin to top off. I looked through many other forum posts, and the consensus is that Pentosin is compatible.

Originally Posted by malc4d View Post
Not sure, but you will need special fluid. Do not use atf.
 
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Old 04-25-2019, 07:47 PM
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That fluid is about twice as thick as what is called for. Aircraft 5606 hydraulic fluid is what you want.
 
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Old 04-25-2019, 07:59 PM
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Originally Posted by Jagboi64 View Post
That fluid is about twice as thick as what is called for. Aircraft 5606 hydraulic fluid is what you want.
Thanks for the info. I just ordered a pint of the aircraft 5606 hydraulic fluid from a aircraft supply company. It was cheaper than the Pentosin too.
 
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Old 04-27-2019, 11:08 PM
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When I purchased my XJS it had a half full tin of CHF 11S in the trunk, so I can only assume this is what is in the roof pump system.
And it works perfectly!

So do I continue to use the 11S? or the aircraft 5606?
That is my question.
 
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Old 04-28-2019, 02:26 PM
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Originally Posted by Dukejag View Post
When I purchased my XJS it had a half full tin of CHF 11S in the trunk, so I can only assume this is what is in the roof pump system.
And it works perfectly!

So do I continue to use the 11S? or the aircraft 5606?
That is my question.
I agree with you about using CHF 11S. Although the aircraft spec fluid may work, I have not seen anyone else recommending it. In fact, everyone apparently uses the Pentosin. The fact that you have it in your trunk, speaks volumes.
 
 
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