450 backhoe

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darymeck
MC crawler
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Joined: Tue Oct 23, 2018 6:08 pm

450 backhoe

Post by darymeck » Wed Oct 24, 2018 2:50 pm

Hi everyone. I have a 450 straight crawler that we mounted a 9305 JD hoe onto but we can't get hydraulic pressure to the hoe. This hoe came off an identical machine and it worked fine on it. The loader on this machine has good hydraulic pressure but I can only get about 300 psi. to the hoe supply line if I dead end it. I was looking in a 450B service manual and on the valve block it shows a special fitting you need to put in to divert all the oil through the hoe valve as well. Am I missing a certain piece or fitting that I should have taken out of that other machine. Thanks for your help.

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gregjo1948
350 crawler
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Location: Newark Valley,NY,USA

Re: 450 backhoe

Post by gregjo1948 » Thu Oct 25, 2018 4:30 am

Not sure what you're saying. Does the manual show diverting all hydraulic fluid/pressure to the hoe? That would leave the loader helpless, right? On my old Case 580B tire hoe/loader, I've been stuck and had to use the hoe and loader together to free the machine.
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford

Jim B
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Location: western Maine

Re: 450 backhoe

Post by Jim B » Thu Oct 25, 2018 5:23 am

Is the loader valve like a lot of others and needs a "power beyond" sleeve put into the valve to send pressurized oil to the backhoe valve?

darymeck
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Joined: Tue Oct 23, 2018 6:08 pm

Re: 450 backhoe

Post by darymeck » Thu Oct 25, 2018 8:16 am

This machine has an open center system so if the oil flow isn't directed through both loader and hoe valve banks in series the unit won't work properly. To me it seems like I need a power beyond fitting in the loader valve bank but I can't figure out exactly where it would go or where I would find one and I couldn't find what I was looking for on the JD parts break down. Thanks Daryl

darymeck
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MC crawler
Posts: 3
Joined: Tue Oct 23, 2018 6:08 pm

Re: 450 backhoe

Post by darymeck » Thu Oct 25, 2018 8:29 am

Just a quick reply back so you guys know what I found. We found the sealing rings to be blown on the power beyond fitting. When we replaced them the machine works like a dream. Thanks everyone and have a great day.

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