[AT] Hydraulics Help

[Will Powell]

Is the cylinder extending while the pump is running? 

I'm not a hydraulic expert, but if its easy to pipe in a valve, or how about a plug? Somehow block the line and see if the cylinder still extends. That would tell you if the cylinder has a leak at the piston... 

My old HD6G dozer leaks, but not that fast. If I lift the bucket it will drop in about 4 hours. Not fast enough to bother fixing. 

Regards, 

Will 

----- Original Message ----- 
From: drupert at seanet.com 
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com> 
Sent: Friday, May 27, 2011 2:47:16 AM 
Subject: [AT] Hydraulics Help 

I have a question - Is there a relatively easy way to determine if a 
hydraulics problem I am having is in the Valve or in the Cylinder. 

The Bucket on an old Loader I have has a double acting Cylinder. Once the 
Bucket is curled up (i.e., the Cylinder is retracted) the Cylinder will 
slowly start extending on its' own and will be fully extended in a couple 
of minutes. The external leaking - although annoying - is relatively 
minor. I am thinking that maybe the seal on the Piston in the Cylinder is 
bad allowing the Piston to move through the fluid. If the Valve is the 
problem I guess I am not sure what the failure mode could be. 

I am hoping the problem is the Cylinder as it will be the easiest for me 
to fix but I don't want to waste time there if the problem is somewhere 
else. Any ideas on how to nail this down ... I am guessing someone has 
run into this before. 

Thanks - 
Dudley 

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