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Bobcat  > Skid Steers  > Re: bobcat 773 arm problem  
 
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 Author Thread: bobcat 773 arm problem
lucasto is not online. Last active: 5/11/2011 11:21:35 AM lucasto
Joined: 21 Apr 2011
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bobcat 773 arm problem
Posted: 04/21/2011 01:15 PM
hi all, i have some problem with my BobCat 773 the lift arms have problem during the raising maneuver the arm raising very slowly; i have change the gasket and i have make a complete revision of the spool valve but the problem persists. How i can solve my problem?Thx
OldMachinist is not online. Last active: 10/24/2014 6:01:15 AM OldMachinist
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Re: bobcat 773 arm problem
Posted: 04/21/2011 02:36 PM

Check to make sure the main relief valve pressure(3000 psi)set right. If it correct then it sounds like one or both the lift cylinders are bypassing internally(bad piston seal). If you can't get the recommended pressure by adjusting the relief valve then the ether the relief valve is bad or the hydraulic pump is getting weak.


Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
lucasto is not online. Last active: 5/11/2011 11:21:35 AM lucasto
Joined: 21 Apr 2011
Total Posts: 5
 
Re: bobcat 773 arm problem
Posted: 04/22/2011 10:38 AM
ok thx so much for your aswer. If you can help, I give u another information about my problem,when i do the lowering maneuver the arm move fast at the correct velocity. Another question where is the main relief valve near the filter?
OldMachinist is not online. Last active: 10/24/2014 6:01:15 AM OldMachinist
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Re: bobcat 773 arm problem
Posted: 04/22/2011 11:02 AM

The main relief valve is on the control valve. It's marked MR on the diagrams below. Its location depends on your serial number.

controlvalve1.jpg


Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
lucasto is not online. Last active: 5/11/2011 11:21:35 AM lucasto
Joined: 21 Apr 2011
Total Posts: 5
 
Re: bobcat 773 arm problem
Posted: 04/23/2011 05:04 AM
thx again for your prompt response; sorry but i worded the question wrong cause my bad EnglishSmiley how i can test the main relief valve?i don't find, not the MR valve, but how to connect a manometer for ceck the pressure i don't find a test plug Thx again
OldMachinist is not online. Last active: 10/24/2014 6:01:15 AM OldMachinist
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Re: bobcat 773 arm problem
Posted: 04/23/2011 08:22 AM

Hook the gauge to the female coupler for the auxillary hydraulics.


Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
lucasto is not online. Last active: 5/11/2011 11:21:35 AM lucasto
Joined: 21 Apr 2011
Total Posts: 5
 
Re: bobcat 773 arm problem
Posted: 04/26/2011 11:10 AM
ok i have test the pressure and i have measured only 1000 psi even if I have set the main relif valve. It's possible a probelm of the pump?
Tazza is not online. Last active: 10/23/2014 8:42:33 PM Tazza
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Re: bobcat 773 arm problem
Posted: 04/26/2011 03:04 PM
It could be a weak pump or bad relief valve, even some crud stuck under the relief valve can do this. Remove it and check that the spring isn't broken.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
lucasto is not online. Last active: 5/11/2011 11:21:35 AM lucasto
Joined: 21 Apr 2011
Total Posts: 5
 
Re: bobcat 773 arm problem
Posted: 05/03/2011 12:01 PM
The problem is the pump i have disassembly it and during the check i have found the 2 worn and the gear nailed now i wait the parts for replacement. Thx at all Bye
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