JDcrawlers Messageboard

We have a guy that comes and services the loader at my place of work (gunlake concrete) and i phoned him up and asked him a couple of Q's and that afternoon he was kind enough the stop by my place on his way home and have a quick look at the situation, he ran me thru the basics of the hydrolic syste...

I had a look at the relief valve and couldn't really see anything to wrong so I pulled it apart cleaned it and put it back however there is a screw behind the 18mm bolt with copper washer and it was wound nearly all the way in and as I wound it out the revs picked up and the black smoke cleared, the...

I would take a serious look at that valve and see if all the parts are intact and that there is no obstruction in the return path from the valve to the reservoir. Ok, I'll have a look at that this afternoon and hopefully I find a problem with it!... I hate having these problems!, I don't mind once ...

http://i153.photobucket.com/albums/s218/munkey_bucket/photo.jpg I think it it the large one marked with a red dot that is making the nosie (they are the relief valves right?) i undone the 4 screws and toke the cap off and inspected but no visable problem The smaller one on the left gets pretty warm...

Yes the two hoses are together.

There's no problem with the 4in1


Thanks

Ok good, I will investigate further in that area!

Cheers mate


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. Each of those valves has its own pressure relief valve and you can hear the squeal from the relief valve when they are operating. I disconnected the backhoe to eliminate any problems there so I know the problem is in the machine somewhere and not in the backhoe. I do notice a sound coming from ri...

It almost sounds like the return quick disconnect is blocked or not working. That would explain why the engine is loaded all the time from the hydraulics being up against the relief valve pressure. That is the problem i have now. I disconected the backhoe, checked and cleaned the quick disconect co...

Thanks for all the info

Hopefully I'll have enough daylight to have a play about with the it this Arvo.

Thanks fellas

Ok cool

Are each of this 6 valves separate units or are they all joined together as one bank?

You wouldn't happen to know off the top of your head how they are bolted in ?, just to give me an idea what I'm up for when I get home ?

The 450 hydraulic system is open center. You should not be getting pressure to the crowd cylinder unless you have opened the control lever. You should check the control levers for the hoe. One maybe stuck open and you are not getting power beyond that circuit. Turns out you are on the money old mat...

. The backhoe should be attached by quick disconnect couplings at the rear of the machine and is also part of the loader hydraulic system. The hydraulics for your loader/4 in 1/backhoe are a separate system from your HLR transmission so using the loader system shouldn't affect the speed of the craw...

Tigerhaze wrote:I thought you had to switch the valve for one or the other, but couldn't operate both at the same time. Could this be an issue?

Hi, just seen your post. I can operate both at the same time on my machine

Thanks for your reply but i found these quotes and have a couple of Qs.. Your machine has an "open center" hydraulic system meaning that the hydraulic fluid circulates constantly whenever the engine/pump is running." - so I need to push the lever to make the oil come out of that hose right? "If you ...

Actual Machine