jaybird

I have older trim pumps (late 80's) TRS setup w/ trim and tab pumps that do not have the separate reservoir. Do the drives / tabs need to be in a particular position (all the way up / down ) to correctly check the levels? Also what type of fluid should be used - brake / hydraulic fluid ?

Thanks!

stageharbor

Drive should be all the way down, tabs should be all the way up. You can use hydraulic fluid or motor oil. Never brake fluid.

jaybird

ok thanks.

What if I don't know what's in there, is it ok to mix hydraulic fluid and motor oil, or do you need to drain / bleed the system? If so that will be my next question - how to bleed?

Thanks.

H2Xmark

I would not mix them, a friend of mine had mixed and his fluid started to gel and get thick, bleed by operating unit up and down a few times and keep fluid level to the full mark

jaybird

Ok - I guess I should of asked how to drain these pumps 1st!