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07-30-2016, 07:49 AM
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#1
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Member
Join Date: Apr 2016
Location: Washington
Posts: 31
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Bleeding the hydraulic cylinder
Does anyone know the proper way to bleed any air out of the hydraulics? I'm pulling a 2005 17T.
I've tried the suggestions with the lowering knob but our top still creeps down. We were so low on fluid when the problem began I can't help but think there might be some air in the system.
Thanks!
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07-31-2016, 06:32 PM
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#2
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Senior Member
Join Date: Nov 2011
Location: reno, nv
Posts: 406
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I had issues with my hydraulic and replaced several parts.(rebuilt )
Never had to bleed system, and I don't know of a bleed port anyway.
If you look at the system, it is such a short travel from the pump to the hydraulic ram body , and uphill, that I don't think that is an issue.
Just maintain your fluid level. In the down position!!!!!
Creep is not really an issue.
Let it rest on the safety bar
I have for years
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2002 ford f350, 7.3 diesel
1985 hi-lo funchaser
kb0nai
kd7ctk
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07-31-2016, 10:41 PM
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#3
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Member
Join Date: Apr 2016
Location: Washington
Posts: 31
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Thanks for the input. Glad to know I'm not only one relying on the safety bar.
The weird thing is that it wasn't creeping down for some time until recently.
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08-01-2016, 02:07 PM
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#4
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Senior Member
Join Date: Mar 2010
Location: Far West Texas
Posts: 1,370
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Quote:
Originally Posted by montana
Does anyone know the proper way to bleed any air out of the hydraulics? I'm pulling a 2005 17T.
I've tried the suggestions with the lowering knob but our top still creeps down. We were so low on fluid when the problem began I can't help but think there might be some air in the system.
Thanks!
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Try this procedure. I do this every six months as preventative maintenance.
http://www.hilotrailerforum.com/f61/...o-trailer-129/
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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas
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08-01-2016, 03:08 PM
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#5
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Senior Member
Join Date: Nov 2011
Location: reno, nv
Posts: 406
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My hi-lo is much older.
The seal and lowering pin can get contaminated with small debris in the fluid and doesn't get a good seal. So pressure is lost and the top creeps down from its own weight.
You can try purging/flushing the fluid to reduce this problem...but it may still remain. Least costly!
You can rebuild/replace the lowering pin and seal on front of pump...but it may still remain. This was not my choice since mine is sooooo old.
Now it is getting more costly.
Ruben's listed procedure is good and does work.
or you can just live with it and call it good.
My call
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2002 ford f350, 7.3 diesel
1985 hi-lo funchaser
kb0nai
kd7ctk
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08-02-2016, 12:06 PM
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#6
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Member
Join Date: Apr 2016
Location: Washington
Posts: 31
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Thanks RCR. I've tried this procedure a few times to no avail
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08-02-2016, 12:20 PM
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#7
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Member
Join Date: Apr 2016
Location: Washington
Posts: 31
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I may try replacing the fluid. That's not a bad idea.
Have you replaced a lowering pin? I wonder how much trouble that would be.
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06-26-2018, 12:07 PM
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#8
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Member
Join Date: Jun 2013
Location: South Carolina
Posts: 27
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Montana, Did you ever figure out the problem and accomplish a repair? I am having the same problem after the transmission fluid being low in the hydraulic system. Never had a problem before this happened. Can't find a leaking source and have followed the debris removal procedure noted earlier in this post without success. The top will only very slowly raise to the safety bar if I physically help it the last couple inches. Once the raise button stops raising, the top immediately begins to lower but not as fast as when the lowering button is pushed.
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06-26-2018, 05:50 PM
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#9
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Member
Join Date: Apr 2016
Location: Washington
Posts: 31
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I never did figured it out. Mine lowers so slowly, that, even in the unlikely event that the safety bar were to fail, a person would have plenty of time to remedy the problem before being squashed.
I would still like to correct the issue. I might get it to a service joint one day.
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06-26-2018, 07:59 PM
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#10
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Site Team
Join Date: Feb 2015
Location: SWFL Bonita Springs/Andrews, NC
Posts: 1,264
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Is there fluid in the plastic hose, the one going back to the resv? Or on the ground? It kinda sounds like an internal leak in the piston. A local heavy equipment repair place can rebuild it in a day or so. Here in FL, it cost about $200. Ensure they test it to 2600 PSI with Dextron 2 thru 4 AT fluid.
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Treeclimber
2703 Tow Lite
2002 Escalade
Bonita Springs, Fl. &
Andrews, NC
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