Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Discussion Forum

Bobcat hydraulics question

Welcome Guest, Log in or Register
Author 
james3838

04-09-2008 04:59:32




Report to Moderator

Hi folks, newbie here. I have a 2002 model B200 bobcat loader backhoe that I use around the farm. Last week I broke a hose fitting on the 4 way bucket, replaced the hose and on the second attempt to open the 4 way the fitting that the hose hooks up to broke. Its actually a small, brass reducing elbow the goes from the quick connector to the hose. I bought a new one yesterday, installed it, and again on the second attempt to open the 4 way, the new fitting broke off. Anyone ever had this happen before? Do I need to bleed the lines in any way when I replace these hoses and fittings? Any input will be greatly appreciated.

[Log in to Reply]   [No Email]
james3838

04-10-2008 09:19:16




Report to Moderator
 Re: Bobcat hydraulics question in reply to kc5gxc, 04-09-2008 04:59:32  
Thanks for the tips guys. I did find the problem and it was a clearance issue. The bracket that holds the quick connects had been bent enough that when I tilted the bucket back all the way, it was making enough contact that it was bending the small male fitting back and when I put the pressure to it it was blowing. Got it fixed though after tearing down the entire bucket looking for a stupid relief valve. :oops: . I really appreciate everyone input though, especially your MSM. You were on the money. Great website by the way :D

[Log in to Reply]  [No Email]
NCWayne

04-09-2008 17:53:19




Report to Moderator
 Re: Bobcat hydraulics question in reply to james3838, 04-09-2008 04:59:32  
When you say it broke how and where did it break. Does the break look like it sheared off or like the fitting burst and blew oil out the side? Did it break off at the male pipe threads or where the hose attached? When it "breaks" do you hear a whine in the hydraulics like oil going through a relief or if not what do you hear? Does it do it the instant you hit the leaver or does it take a few seconds for system pressure to rise before it breaks/bursts? Just looking at what happened and listening to the system in operation could tell you alot about what may be causing it to fail. Without knowing more I'll hazard a guess for you as to what may be happening. Personally before I did anything else I'd get a steel fitting to put in the system. Brass is rated alot higher than many people think but I still like the security of a steel fitting. Steel is rated for alot higher pressure than the brass and a steel fitting will usually tend to bend before it breaks where brass tends to just shear and break. When it might keep me from getting scolded with hot oil I'll use steel every time. If that doesn't do it I'd check both of the quick connects. I have seen them some apart inside and block the line internally in such a way that one time it'll block and the next it'll allow fluid through. They may still hook up properly but when you take them off you can see the broke parts from the back side. I experienced that problem with a friends Ford tractor not too long ago. In his case it didn't blow lines/fittings but it worked one time and not the next. That said, if the quick connect on the other hose has the line blocked then the open side of the cylinder is being allowed to build full system pressure, something it wouldn't typically do under "normal" use unless you opened it against the stop and held the lever. Even then the fitting should be able to stand system pressure but depending on where the relief is a blockage, if that's the cause, may becutting it out of the loop. Usually your higher pressure comes in when you close it and hold something so it's on the other side of the cylinder and in the other line. Being under full pressure the brass fitting may be the weak link and just may not have enough meat to handle the full system pressure. If the quick connects check good you may try swaping them and see what happens. The bucket should still work just the controls will be in reverse. I'm not that familiar with your exact machine but if you have anymore general questions I'd be glad to help if I can. Good luck and let us know what you find.

[Log in to Reply]  [No Email]
james3838

04-09-2008 08:58:31




Report to Moderator
 Re: Bobcat hydraulics question in reply to Billy NY, 04-09-2008 04:59:32  
I've looked at that too but there is plenty of clearance on the hoses and the fittings.



[Log in to Reply]  [No Email]
MSM

04-09-2008 07:56:06




Report to Moderator
 Re: Bobcat hydraulics question in reply to james3838, 04-09-2008 04:59:32  
Are you sure part of the bucket linkage isn't hitting the hose or fitting as it opens and is shearing off the fitting? Some of the fittings have to be set at the correct angle so there is not a bind or interference problem as the cylinder or attachment makes its full range of travel



[Log in to Reply]  [No Email]
J Schwiebert

04-09-2008 06:22:31




Report to Moderator
 Re: Bobcat hydraulics question in reply to james3838, 04-09-2008 04:59:32  
I think part of your problem is the brass fitting. Hydraulic systems use steel fittings not brass to take the pressure. Maybe check the relief valve setting as well. Someone may have raised it to get more lift. J.



[Log in to Reply]  [No Email]
james3838

04-09-2008 06:44:02




Report to Moderator
 Re: Bobcat hydraulics question in reply to J Schwiebert, 04-09-2008 06:22:31  
Thanks for the reply. I bought the fitting from the Bobcat dealership. It is the same fitting and made of the same material that was on the tractor when I bought it. The origional worked for several years before it broke. I think I may have a problem with the relief valve if I can just locate it. The Service Manager at the Bobcat dealership is baffled by this and can"t figure out what the problem is nor can he tell me where the relief valve is. Like I said, it has worked fine since I bought it a year ago but all of a sudden I"m blowing hoses and fittings on that particular line. All other hydraulic systems are working fine. My thought is to find the relief valve, bleed the system and try again. Don"t know what else to do.

[Log in to Reply]  [No Email]
135 Fan

04-09-2008 11:50:09




Report to Moderator
 Re: Bobcat hydraulics question in reply to james3838, 04-09-2008 06:44:02  
You don't have to bleed the system. Did the 4 in 1 bucket move or did the fitting just blow apart? Was the bucket at the end of it's travel and the valve pushed the wrong way to put max.pressure on the system? The Bobcat service manager doesn't know where the relief valve is on a Bobcat machine? That's scary in itself. It might be right in the control valve. It's possible that each function has it's own relief valve at the same or different pressure. Maybe it's stuck or something. The dealer should have a repair manual for it. Give that service manager a whack on the side of the head. That's really sad. It's not surprising he's baffled. Is he a relative or friend of the owner? How to you get a position like that if you don't know what you're doing? Dave

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy