Bear Posted August 14, 2008 Posted August 14, 2008 Hydro works great but hyd lift is very slow. What can I check for
Brent_Baumer Posted August 14, 2008 Posted August 14, 2008 Just a thought, try a thicker shim in the check valve. See this thread and the links within the thread: http://www.simpletractors.com/club2/topic.asp?TOPIC_ID=97270
Bear Posted August 22, 2008 Author Posted August 22, 2008 Put in thicker shim in pump hyd lift works great. thanks
HubbardRA Posted August 23, 2008 Posted August 23, 2008 One note of caution: If you are shimming to increase pressure on the hydrolift, you should put a gage in the hose to check the pressure. 800 psi is max. If you go above 800 psi you are taking the chance of cracking the housing at the pump. The charge pump can produce more than the housing can withstand. This is the reason for the factory settings on bypass valves.
SmilinSam Posted August 23, 2008 Posted August 23, 2008 I have the same slow problem in my DA917. Works quick enough with the deck, But progressively slower with heavier attachments, to where you need to grab the rototiller by hand and get it strted to going up. I was assuming its time fro new o rings in the lift valve. Yes/No??
richp Posted August 24, 2008 Posted August 24, 2008 Isn't there a relief valve built into the control (Cessna) valve. That should protect the pump also.
HubbardRA Posted August 24, 2008 Posted August 24, 2008 Sam, Only time I have heard of anyone rebuilding a valve is if it will not hold against a load when in the neutral position. I have that problem on the backhoe of my EF1 now, but it still has plenty of pressure to dig with.
SmilinSam Posted August 24, 2008 Posted August 24, 2008 quote:Originally posted by HubbardRA Sam, Only time I have heard of anyone rebuilding a valve is if it will not hold against a load when in the neutral position. I have that problem on the backhoe of my EF1 now, but it still has plenty of pressure to dig with. Must not be my problem then. Once up it stays up, even with the tiller. It just is reallllly slow trying to get the tiller lifted up
HubbardRA Posted August 25, 2008 Posted August 25, 2008 You should remove the check valve and check for a sludge buildup, or a piece of dirt keeping the valve from seating properly. If everything is clean, then insert a small shim behind the spring and see if that helps. Like I said above, do not shim very much without checking the pressure.
HubbardRA Posted August 26, 2008 Posted August 26, 2008 The one on top is the hydrolift check valve, the one on the side is for the tranny. [img]http://www.simpletractors.com/club2/attach/HubbardRA/ValveWriteup.jpg[/img]
SmilinSam Posted September 7, 2008 Posted September 7, 2008 Hehe I went to take the capscrew off to check the valve and the cap was almost one full turn loose to begin with. That was an easy fix Thanks Rod
Roy Posted September 7, 2008 Posted September 7, 2008 "That was an easy fix" Love it when I fall into an "easy fix". :)
bsadler Posted September 7, 2008 Posted September 7, 2008 Since you are all up to speed on the hydro please answer a question for me. I took your advice and put a gauge in the front port shown HubbardRA's diagram. This port did not have any spring in it but only the plug. I bottomed out the ram and the gauge went to 800 psi. Assuming the gauge is accurate I thought this was ok. Is the place I checked it the correct place? The hydrostat was out of a non hydraulic and now has a hydraulic cylinder installed. The cylinder works great. thanks,
HubbardRA Posted September 7, 2008 Posted September 7, 2008 I don't have a copy of the actual setup manual for a hydrolift. I am pretty sure it was D17_Dave who told me about the 800psi limit and how going higher than that could break the housing. Someone posted a copy of the manual showing the gauge hook up recently, but unfortunately I did not copy it.
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