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Hydraulic Repair

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Andrew Bell

08-14-2000 06:24:47




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I've got a leak in the cylinder of my WL42. I guess I need to replace the seals. Before I start unscrewing the lines to the cylinder, how do I make sure that all the pressure is out of the system so that I don't take my hand off in the process? Am I supposed to drain the hydraulic fluid off?

Thanks for any info!




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george

08-14-2000 11:41:07




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 Re: Hydraulic Repair in reply to Andrew Bell, 08-14-2000 06:24:47  
AB:

Keep a bucket and some rags handy...that oil is MESSY!



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big fred

08-14-2000 09:41:28




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 Re: Hydraulic Repair in reply to Andrew Bell, 08-14-2000 06:24:47  
If the engine isn't running, and if the load is supported (bucket is on ground or sawhorses or something) you shouldn't have any pressure. You will see a fast leak around the connection if you do, but it won't suddenly come apart, as you have either an O-ring or pipe threads that will lose their seal several turns before they become mechanically disengaged. Just make sure you have the bucket on the ground or very well supported, to keep it from crushing or pinching you. Have fun and keep everything clean.

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Andrew Bell

08-14-2000 18:04:04




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 Re: Re: Hydraulic Repair in reply to big fred, 08-14-2000 09:41:28  
When I get everything back together, do I have
to bleed the system somehow, like brake lines in a
car? If so, do you know how this is commonly done?



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big fred

08-14-2000 20:40:59




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 Re: Re: Re: Hydraulic Repair in reply to Andrew Bell, 08-14-2000 18:04:04  
If it's a double acting cylinder, you can simply cycle it a few times to the end of its stroke to bleed the air out of the system. If it is a single acting cylinder with a hollow tube acting as the ram, you will have to first fill it carefully and get as much air out as possible, then cycle it a couple times with the hose connection higher than the ram end.



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Danger warning

08-15-2000 16:58:27




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 Re: Re: Re: Re: Hydraulic Repair in reply to big fred, 08-14-2000 20:40:59  
Relieve the pressure by moving the valve to all postions with the engine off before you disconnect any lines. HIGH PRESSURE OIL CAN ENTER YOUR BODY THROUGH YOUR SKIN CAUSING SERIOUS INJURY.



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big fred

08-16-2000 07:07:41




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 Re: Re: Re: Re: Re: Hydraulic Repair in reply to Danger warning, 08-15-2000 16:58:27  
Good point, but that isn't necessarily going to relieve pressure if there is a check valve in the system. The only way to guarantee you have no pressure is to make sure there is no load on the system and the pump (engine) is off. Placing the cylinder at mid stroke and disconnecting the cylinder at the tie rod ends before unhooking the hoses should do that.



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