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WHOA IS MY 300U =(

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JayWalt

01-31-2007 08:42:26




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Well you all remember my 300u hydraulics loading up the engine I decided to tear into her today, even tho it is 15 degrees. It's not really that bad when u put 2 pairs of socks and gloves on. Well I decided best thing to do was to take the res cover off and check out the screen. I got the valves off too and am in the process of tearing them apart so I can match up new orings. I got a big surprise under my res cover tho. My filter is smashed. I mean like caved in all around. I figured its cause it was dirty, which it is, and the pump sucked it into itself. So I decided I would clean it off the best I could and use a coat hanger with the end bend 180 so its nice and smooth to reshape it the best I could. Just out of coriousity I looked into the inlet pipe to see if I could even see through the screen. To my amazement i could and instead of the fine screen it was a very corarse mesh screen, I was like WTF? Turned it over and the area right by the inlet pipe's fine mesh is GONE!!

There is definitely dirt in the system. This is bad news in a sense, and good news as well. Bad news because its been like this god knows how long, good news is the hydraulic system still has more balls then I know what do to with. So I guess its off to the dealer to get a new filter and res cover gasket.

I am happy to a degree. It will be nice knowing everything is the best it can be. Also to help flush the pump, I'm going to fill up the inlet hard line and bump the starter over so it shoots out the pressure line several times to get as much crap oput of the pump as I can.

Now, why is the filter crushed? Too much buildup caused the pump to suck it in and eventually to rip some of the fine mesh loose?
This botheres me.
What is all located in the cover? I got the 2 hardline pump orings out, and the oring/filter. Is the rest just passages or are there mechanisms in there I should inspect? I dont wanna take the cover off the lift If I dont have to as it probably weighs 100 lbs.

Im calling the dealer, maybe they have oring kits for the hydra touch vavles which would be easier and probly not much more then matching them up at tsc, doubtful, but doesnt hurt to ask.

Wish me luck guys!! Maybe just maybe this will help my whiney pump. Maybe just maybe the screen recently ruptured when I noticed no more whine, but that was the same time the pump seemed to labor the engine, maybe the 2 go hand and hand, who knows!!

All I can say is the pump should be fine, maybe not the best pressure like a new one, but it had no problems lifting up the front end of a junk car about 8 feet in there air!! Me and my nephew were having a little destructive fun with it!!

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Wardner

01-31-2007 15:18:18




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 08:42:26  

Don't you mean "Woe" as in "Woe is me"? If you spell it right, you have a better chance of communicating.

The crap in your hydraulic of was not "dirt"; meaning, in this sense, it was not an abrasive. I suspect some of the additives in the oil underwent "polimerization", or perhaps, just plain oxidation.
Shxt happens.



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Janicholson

01-31-2007 14:52:28




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 08:42:26  
Jay,
If it is not an issue to be show, I would cut a 16" chunk out of the low pressure steel line and put hose adapters on each end. I would then use a full Flow hydraulic filter (spin on) and mount it on the side of the block with hose attachments to clear the engine oil filter. Some planning, and 50$ should do the job with much better servicibility. JimN



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JayWalt

01-31-2007 15:22:42




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 Re: WHOA IS MY 300U =( in reply to Janicholson, 01-31-2007 14:52:28  
Thanks bud, now that you say it, I actually realize I can just use hoseclamps, as its like no pressure instead of 1300psi, so that is awesome!!
Also got the filter out of the regulator, but it is also sucked flat, and where it meets the end its ripped. It appears to be a cone shape almost like a compression fitting, so Im hoping to take the cone off, cut the filter straight and reattach it, if its the way I'm thinking it is. Its not dirty hardly at all, but i think the main filter went, then this one got all dirty and collapsed and did the same as the main, then it got washed clean. Its cool I can use hose and mount it somewhere as, theres no room inline. Any ideas what kind of hose to use? I would think radiator hose would get eaten by the hydraulic fluid. I'm open to ideas. I'm going to usae a pipe cutter if I can to cut the low pressure line to help eliminate any shavings getting into the pump. Now where to get a filter mount thingy...
It will look hob cobbled, but it should be a selling point if I mount it up nice, as it is alot easier to change.

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Janicholson

01-31-2007 17:07:23




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 15:22:42  
Hydraulic hose is still preferred, from NAPA, or a hydraulic shop. Suction hose still needs reinforcment, to avoid collapse. Flexible and kink resistant is also important. Rough up the ends of the tubing where the hose slips on in a circular pattern (round and round, not on and off) so the hose has a surface to grip and not come off. Two SS hoseclamps alignedwith eash other on each end look professional. Cut the middle of the tube with a hack saw then clean out the chips. With it clean, shove some wadding on a string up the tube past the new cut location. Cut with a hacksaw and clean up the cut with a rat tail file or burr reamer. Then pull the wadding out. Same on the other (third) cut, JimN

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JayWalt

01-31-2007 11:45:28




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 08:42:26  
Well I give up. The screen has more holes in it then swiss cheese. The main portion around the inlet pipe is all cracker, I tried to make a brace to go around the bottom, but main theres going to be no flow. Now I have to decide if I should buy one, or just get a inline setup and have my friend braze it to the hardlines, which would be alot easier to change.
Let me know what you guys think I should do.
I'm trying to figure how they got solder to stick to steel pipe?!?!?!

Oh boy, Not sure what to do now... seems most of the filter hookups have pipe threads, and my hardlines are both solid to one block at both ends, so i can screw them on... hmmm...

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TDK

01-31-2007 09:21:35




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 08:42:26  
The last 300 I had the same problem as you're having needed a screen too. Screen was sucked together and also had holes in it. This led to the trash getting into the safety regulator and stopping up the orfice plug and screen. Three years ago the reservoir screen was 65 dollars I believe. Sounds like you're getting it straightened out!



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JayWalt

01-31-2007 09:08:39




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 08:42:26  
$87 for the filter, OMFG!!! $17 for the gasket, jesus. Ive heard people just use RTV on the cover, but i dunno, its constantly submersed in hydraulic fluid. Hmm...
man $87 for a screen mesh filter is just plain nuts!!
I'll have to see what I can find... I know I can't leave it like this..



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Formerly PaMike

01-31-2007 09:25:48




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 09:08:39  
I had holes in my screen. We soldered the holes shut. Hydraulics still work fine and it beats the new price.



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JayWalt

01-31-2007 09:52:23




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 Re: WHOA IS MY 300U =( in reply to Formerly PaMike, 01-31-2007 09:25:48  
Thats what I'm working on now... its not fun, hahaha Im getting out the big soldering gun, 140watt, as opposed to the destructive torch...

wish me luck....



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Sentry

01-31-2007 10:01:29




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 Re: WHOA IS MY 300U =( in reply to JayWalt, 01-31-2007 09:52:23  
JayWalt,

Had the same happen here. Fine brass screen with the soldering method works great. Takes alot of heat. I used a tinsmith solder torch. Big copper head with gas flame heating it. Seems the few I repaired were more a result of ice (moisture) in the system and gathering on the suction screen during freezing temps.

Good Luck and happy restoration



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