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Bobcat  > Skid Steers  > 753 Auxiliary Hydraulics  
 
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 Author Thread: 753 Auxiliary Hydraulics
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
Joined: 28 Nov 2009
Total Posts: 7
 
753 Auxiliary Hydraulics
Posted: 11/28/2009 06:10 AM
I'm a new Bobcat 753 user and just got a backhoe attachment which attaches to the front hydraulics of the Bobcat. Is there a "trick" to getting the hydraulics hooked up? The top one snaps on pretty easy, but I have pushed and banged on the bottom connection and can not get it to lock. It acts as it is under high pressure. Is there any way to release the hydraulic pressure before I hook up? I get it to within about 1/8" of the detent and that's as far as it goes. Thanks all ... Great Forum! Jim
nerker is not online. Last active: 10/15/2014 9:02:13 AM nerker
Joined: 22 May 2009
Total Posts: 9
 
Re: 753 Auxiliary Hydraulics
Posted: 11/28/2009 07:58 AM
Not sure if this works on 753, but try to move your right hand "stick" right and left with engine off. That should bleed pressure to aux. quick connects.
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
Joined: 28 Nov 2009
Total Posts: 7
 
Re: 753 Auxiliary Hydraulics
Posted: 11/28/2009 10:28 AM
Nope ... didn't work on a 753. I guess I'll have to disconnect the fittings and hope that releives the pressure.
jerry is not online. Last active: 10/18/2014 6:38:10 AM jerry
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Re: 753 Auxiliary Hydraulics
Posted: 11/28/2009 02:07 PM
On your machine aren't the aux hydraulics controlled by switches? If they are turn the key on and without the engine running and operate the switch on and off and it should relieve the pressure.

LX665,backhoe,snowplow,assorted homemade stuff Northeast Mn
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
Joined: 28 Nov 2009
Total Posts: 7
 
Re: 753 Auxiliary Hydraulics
Posted: 11/28/2009 03:47 PM
Yes, there's a toggle switch on the front of the right stick and a trigger switch on the back of the right stick. I don't know what the trigger switch does, but the aux hydraulics are controlled by the toggle. I'll give your suggestion a try first thing tomorrow. Thanks!
skidsteer.ca is not online. Last active: 7/21/2014 8:31:40 PM skidsteer.ca
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Re: 753 Auxiliary Hydraulics
Posted: 11/29/2009 04:05 AM

Worst case loosen a fitting. Moving the hoe controls may help to.

But depending on the year of your 753, some of the old ones (753 753c 753F from the 90's) you turn the key backwards past stop and hold a couple seconds) and the newer G series (triangle head lites) have a “auxiliary pressure relief” white button up on the dash that you you use to shut the engine off.

Ken


NH LS 160, S150, S185 Hoe Brusher Grapple Auger, Mixer Tiller Soil Conditioner Trencher Tracks Snow Blade Wood Splitter Stump Grinder Land Plane. Dealer Virnig Erskine Componets Plus Wallenstein Bauma Lite
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
Joined: 28 Nov 2009
Total Posts: 7
 
Re: 753 Auxiliary Hydraulics
Posted: 11/29/2009 06:10 AM
Apparently there is no pressure relief built into my model 753 (not sure which model it is). I tried all of the suggestions from everybody's posts, and nothing seems to work. I guess I'll go get out the wrenches! Thanks all for the help. Jim
jerry is not online. Last active: 10/18/2014 6:38:10 AM jerry
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Re: 753 Auxiliary Hydraulics
Posted: 11/29/2009 08:05 AM
There is a guy in Colorado that makes a tool for relieving pressure. It looks like a bent tuning fork to slip over the fitting and a threaded rod that you screw down into the fitting to depress the end. Simple looking thing shouldn't be too hard to make one. I have never had this problem with the pioneer type fitting though. I found this through the search here hope it helps. Posted by mrfixitpaul on 8/17/2009 9:51:58 AM Are you relieving the hydraulic pressure? On the 853 you relieve the pressure by holding the ignition key to the left as you shut off the engine, and hold the key there for a few seconds after the engine is stopped. This won't work after the engine is stopped, as it needs some pressure in the rest of the hyd system to make the aux. spool move to relieve that pressure. This should reduce pressure enough to couple up. Otherwise you may have to loosen the coupler with a wrench and bleed off ...

LX665,backhoe,snowplow,assorted homemade stuff Northeast Mn
mrfixitpaul is not online. Last active: 11/25/2012 4:08:16 PM mrfixitpaul
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Re: 753 Auxiliary Hydraulics
Posted: 11/29/2009 08:57 AM
All the 753's prior to the G series have auxiliary pressure relief if you turn key to the left and hold there for a few seconds, but the engine needs to be running at idle when you turn key to left. If engine is already stopped it won't relieve any pressure. Some models will only relieve one of the couplers and some do both, not sure which ones though. On the right control for the aux. the thumd switch is for intermittent control, the trigger is for continuous flow, like for the backhoe. The switch in the dash for the aux has 2 lights on it. when only one light is lit only the thumb switch works, when both are on the trigger and thumb switches should work.
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
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Re: 753 Auxiliary Hydraulics
Posted: 11/29/2009 10:32 AM
Jerry & Mr.FixitPaul, I didn't have the engine running when I turned the ignition switch to the left ... I'll go do that now. Thanks for the help, and Mr.Fixit, thanks for explaining the aux hydraulic switches and controls. It's a new machine for me and I haven't figured everything out yet (can you tell?) Is there a way to tell by looking at the 753 what series it is? The guy I bought it from said he thought it was manufactured in the mid 90s, but he wasn't sure. Thanks again, Jim
soutthpaw is not online. Last active: 1/18/2011 8:50:23 PM soutthpaw
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Re: 753 Auxiliary Hydraulics
Posted: 11/30/2009 05:27 AM

let us know the year of your machine.  My 753 has the key where you turn it counter clockwise from off (like acc position on american cars) it will release all aux pressure and should snap easy... do you have round or flat face connectors..  if you have the round ones, check for torn O ring in the female connectors..   sounds like I have a twin...  post up some pics heh!  

 


1998 Bobcat 753 w/ 60" bucket. forks, rear stabilizers, 709 backhoe attachment
soutthpaw is not online. Last active: 1/18/2011 8:50:23 PM soutthpaw
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Re: 753 Auxiliary Hydraulics
Posted: 11/30/2009 05:34 AM

If it was mid 90”s then its not a G series. which is good if you work on it yourself...

the engine won't run with key turned to the left...  its not supposed to..  it just activates a relief valve in the high pressure side of the aux hydraulics.  then to run the backhoe  once connected  you press the aux hyd button so both lights are lit then press the right trigger once to start the constant flow to the backhoe......   the left trigger and switch are for the rear stabilizers... i did a couple posts about the benefits of the rear stabilizers not to long ago.    my machine was plumbed for them already so not sure what is involved in adding the hydraulics for them but they work real well 


1998 Bobcat 753 w/ 60" bucket. forks, rear stabilizers, 709 backhoe attachment
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
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Re: 753 Auxiliary Hydraulics
Posted: 11/30/2009 12:11 PM
Not sure what the year is. Or the series. I'll poke around the machine and see if I can find anything to identify it. In the mean time, I've tried all the above suggestions, but nothing seems to work. I talked with the local Bobcat shop this morning and he said the machines that have use the ignition key to release pressure are old enough that the mechanism probably dosen't work any more (as opposed to the ones that have a pressure release button). Sooooo, I guess I'll finally give up and get out the wrenches. By the way, my backhoe is not a full backhoe like yours .... basically a bucket on a boom with one hydraulic cylinder which is controlled by aux hydraulics. It isn't much, but does most of the jobs I need to do around the farm. I dug a 200' trench in hard clay last week and it cut through the clay without a lot of problems.
soutthpaw is not online. Last active: 1/18/2011 8:50:23 PM soutthpaw
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Re: 753 Auxiliary Hydraulics
Posted: 11/30/2009 04:41 PM

one thing that may work is lay a rag over the male end of the connector assuming you have the round end not flat ones and give it a couple hits with a brass hammer...  that should let the pressure out of the system.  do it on the backhoe side and the machine side...   the backhoe you have does have advantages for certain things.  digging long trenches for one that are not too deep and the ground doesnt matter if it gets messed up by constant turning  of the skid steer to empty the bucket...   also you have limited depth and reach 

 


1998 Bobcat 753 w/ 60" bucket. forks, rear stabilizers, 709 backhoe attachment
jjquarterhorse is not online. Last active: 3/29/2010 8:53:05 AM jjquarterhorse
Joined: 28 Nov 2009
Total Posts: 7
 
Re: 753 Auxiliary Hydraulics
Posted: 11/30/2009 10:49 PM
Yeah, I've done that with hydraulics on my tractor. The Bobcat has flat end fittings, so I'll need to take a wrench to the fitting. So far I'm pretty happy with my little digger. I figure that the money I didn't spend on a 'real' backhoe will rent me one many times when I have big jobs to do.
skidsteer.ca is not online. Last active: 7/21/2014 8:31:40 PM skidsteer.ca
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Re: 753 Auxiliary Hydraulics
Posted: 12/01/2009 02:53 AM

You could install the coupler block from the new series of loaders  (03 or 04 and up) that has a manual pressure release built in the coupler, but you would have to run a new case drain line up to the couplers also.

Ken


NH LS 160, S150, S185 Hoe Brusher Grapple Auger, Mixer Tiller Soil Conditioner Trencher Tracks Snow Blade Wood Splitter Stump Grinder Land Plane. Dealer Virnig Erskine Componets Plus Wallenstein Bauma Lite
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