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Air in 404 hydraulic system

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JSharp

10-06-2007 17:31:22




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I had the hydraulic filter canister off of my 404 and now I can't seem to get the air out of the system. I added plenty of fluid, more than what I lost and it's overfull according to the level plug. I followed the instructions in the manual to work the hydraulic controls through their range of motion 10 or 12 times.

No luck. I still have no pressure to the 3PT and depending on the position of the throttle or 3PT position controls the system is really noisy.

Any tips on getting the air out of the system?

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JSharp

10-09-2007 10:33:04




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 Re: Air in 404 hydraulic system in reply to JSharp, 10-06-2007 17:31:22  
Well, mine's working now.
I drove it quite a bit plus fooled with it plenty and no luck. I left it sit and a few hours later I had hydraulics. For a while anyway. Then it seemed to have problems with air again. So I left it sit one more night and the next morning it was working fine and has been ever since.
I have no explanation for this but for now anyway, it's all good.

Mine has manual steering too but there's a good side to it IMO. A smaller number of 45 year old hydraulic parts that might need to be repaired or replaced in the future... ;)

--

Jim

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I-CS8FDE415F=2

10-09-2007 09:21:08




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 Re: Air in 404 hydraulic system in reply to JSharp, 10-06-2007 17:31:22  
On my 404 I had drained the whole system to rplace a outer wheel bearing. Upon putting it back together and refilling the system the hydrolics would not work either. I had to run it around the yard for about a half hour, before they started to work again. It just takes a while for it to purge all of the air out. What a work out with no power steering.

Nick



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JSharp

10-06-2007 19:49:31




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 Re: Air in 404 hydraulic system in reply to JSharp, 10-06-2007 17:31:22  
On my tractor, someone has installed a T-fitting in the rubber suction line where it slopes up from the pump. I've pulled the plug on it a couple of times and made sure that the line and the canister were full. But, there's a long length of hard line that is higher than the T so I can't get the whole line full.

I even tried dumping fluid in the T with the engine running then quickly capping the T. No luck. It sucks the fluid right in and the hydraulics work while it's taking in fluid but I can't get the cap on fast enough to keep air from getting in. It just won't start pulling from the suction line.

Grrrrr r....

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J in Pa

10-06-2007 19:34:48




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 Re: Air in 404 hydraulic system in reply to JSharp, 10-06-2007 17:31:22  
take your canister and fill it with hydraulic fluid and put it back on. also, make sure the gasket is good and doesnt leak.
it can be rough to get out sometimes.
J in Pa



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