Hydraulic lift system Hydraulic, mechanical and electrical components of the lift system
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Old 02-01-2017, 02:46 PM   #1
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Default hydraulic fluid in line

While under my rig today with it in the up position, I noticed that the hydraulic lines to the ram are not full of hydraulic fluid. Some places I could see red, and others clear. Is this normal? Will I need to put more mil-h-5606 hydraulic fluid in the reservior?
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Old 02-01-2017, 05:01 PM   #2
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I believe that if your top is raising and lowering ok, that your condition is normal. That translucent line is a bypass that I think only has fluid in it if the ram is leaking past the seals. If you check the fluid level or add fluid, ONLY do so with the top lowered.

Larry
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Old 02-01-2017, 05:17 PM   #3
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Brookside1954, Wow, Mil-H-5606! Haven't heard that since I left Naval Avaition. But don't put that in you hydraulic system. Hi Los use Dexron series automatic transmission fluid. Find the earliest series you can, ie, III, IV, V or even VI. I recently had my cylinder rebuilt and they serviced it with VI. Don't quote me, but 5606 is a natural petro product and is used with synthetic seals==tranny fluid is synthetic and is used with natural seals. Keep an eye on how much fluid amasses in that line and for safety, look for a hyd shop that can rebuild that cylinder. my rebuild was about $200.
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Old 02-01-2017, 05:21 PM   #4
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Default Clean line

A little more of a description, and a hydraulic cylinder diagram, can be found in this thread:

What is the Plastic Line For?

Look at the 6th post down, from Norton Rider.
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Old 02-02-2017, 05:44 PM   #5
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Thank you to all for your help with this issue. Alfred
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Old 09-07-2019, 10:00 PM   #6
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M hilo just went down. Before attempting to raise again today I noticed plastic line was half filled here n there. After a failed attempt to raise the top, I crawled under to find plastic line top be fully filled with fluid. I suppose i need to work on hydraulic shop now right??
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Old 09-08-2019, 06:49 AM   #7
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Motoman, As you suspect in both your posts, you have had an internal hydraulic cylinder failure. The cylinder needs to be removed, taken to a hydraulic shop and rebuilt. Testing to 2600 pis with Dextron A/T fluid. And of course, reinstalled.
Check the "search" heading at the top of the page for "cylinder removal".
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Old 09-08-2019, 06:53 AM   #8
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Moto, Search for "How to remove and replace the hydraulic lift cylinder" About the third one down labeled "Sticky" you'll find some guidance. Best of luck, I've been there.
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