Aux hydraulic question + more

[s.sele]

Hi I am new to this forum, and new to bobcat as well. I have bought a 753 i think F series, about 1992my I dont think it is highflow. I just bought a used 4 in 1 bucket. Connected it and it worked great. except one thing. When I use the thumb switches on the stick the bucket opens and closes very fast, so fast the it makes a big bang when closing the bucket I have one thumb switch on each stick. and what i think is a toogle switch on the front of the stick. My 753 is the one with digital instuments on the right side. Under the instrument it has a button that i think is for the aux hydraulic. when i start the machine up the aux works, if i press the button the aux doesent work. If i press again a grren light lights up and it works (still the same speed) If i press again the light goes out but it still works tha same speed. I guess there should be a way to turn down the flow on the aux hydraulic ? Can any one tell me how this is supposed to work. i have a quick manual for my bobcat but it does not say much about the aux hydraulic The serial on my bobcat is: 508618707 Would also be very happy if any one can tell me what year it is

 

[Tazza]

What style switch is it? does it click as you operate it, or is it nice and smooth both directions?
Now, i believe only G series machines will have vairable speed aux hydraulics, the switch is actually a vairable resistor, the more you move it, the faster it goes, this switch is the smooth one. The other ones are just one set speed, open or close.
If it doesn't have vairable speed aux hydraulics, you can install a restrictor in the line to slow it down some. I would advise installing them near the quick couplers, further down the line and you will have sort or springy action as the hose will flex and expand a little.
My S150 has vairable aux hydraulics, my 753 didn't.

 

[s.sele]

What style switch is it? does it click as you operate it, or is it nice and smooth both directions?
Now, i believe only G series machines will have vairable speed aux hydraulics, the switch is actually a vairable resistor, the more you move it, the faster it goes, this switch is the smooth one. The other ones are just one set speed, open or close.
If it doesn't have vairable speed aux hydraulics, you can install a restrictor in the line to slow it down some. I would advise installing them near the quick couplers, further down the line and you will have sort or springy action as the hose will flex and expand a little.
My S150 has vairable aux hydraulics, my 753 didn't.

I feel it is the click button. But one time i felt it west slow. But i could have been air or something...

 

[farmshop]

I feel it is the click button. But one time i felt it west slow. But i could have been air or something...

As said earlier probably need a restricter in the line. Probably got removed at some time. Most have a fitting with approx 1/16" or 1/8" hole

 

[s.sele]

As said earlier probably need a restricter in the line. Probably got removed at some time. Most have a fitting with approx 1/16" or 1/8" hole

So can i Just use a fitting with smaler hole inn one of the lines near the Quick Connect? Tanks for the help! Can anyone tell me the year of the machine?

 

[flyerdan]

So can i Just use a fitting with smaler hole inn one of the lines near the Quick Connect? Tanks for the help! Can anyone tell me the year of the machine?

It seems that it would be more prudent to put the flow restrict fitting on the implement that you wish to slow down rather than the machine itself should you ever wish to use a backhoe or something else that requires a lot of flow. I'm sure that's what everyone was thinking, just didn't see it mentioned.

 

[s.sele]

It seems that it would be more prudent to put the flow restrict fitting on the implement that you wish to slow down rather than the machine itself should you ever wish to use a backhoe or something else that requires a lot of flow. I'm sure that's what everyone was thinking, just didn't see it mentioned.

So maybe just make a connection with flatface connector and a restrictor in it, dont remember if i asked this earlier but its only nessecary to use restrictor in one line ? Anybody who can tell me what year my bobcat is ?

 

[jerry]

So maybe just make a connection with flatface connector and a restrictor in it, dont remember if i asked this earlier but its only nessecary to use restrictor in one line ? Anybody who can tell me what year my bobcat is ?

I had a problem with one restrictor I made. It was a disk 1/8 thick with a .o93 hole in the center. Put it in behind the coupler and when the flow went toward the coupler it held the disk against the center part and shut off the flow. Put it in the line where it cant move and there will be no problem.

 

[s.sele]

I had a problem with one restrictor I made. It was a disk 1/8 thick with a .o93 hole in the center. Put it in behind the coupler and when the flow went toward the coupler it held the disk against the center part and shut off the flow. Put it in the line where it cant move and there will be no problem.

With only one restrictor, cant that cause problems when using it ? Also can any one tell me the year of the bobcat ?

 

[Tazza]

With only one restrictor, cant that cause problems when using it ? Also can any one tell me the year of the bobcat ?

One restrictor only will work, i'd rather see one on each side though, just because with a double acting cylinder, if you extend the rod, you actaully can generate more pressure on the rod end than the pushing end. For example: you have 2,000 psi pushing one side, if you block the other side, the pressure may be 2,400 psi, this is due to the decreased surface area of the piston.
With a restrictor both ends, you can't over pressurize it.

 

[7LBSSMALLIE]

One restrictor only will work, i'd rather see one on each side though, just because with a double acting cylinder, if you extend the rod, you actaully can generate more pressure on the rod end than the pushing end. For example: you have 2,000 psi pushing one side, if you block the other side, the pressure may be 2,400 psi, this is due to the decreased surface area of the piston.
With a restrictor both ends, you can't over pressurize it.

all good advice but would also recommend the optional aux port relief. about 80 bucks ten minute install.

 

[s.sele]

all good advice but would also recommend the optional aux port relief. about 80 bucks ten minute install.

do you have a link to the aux port relief ?

 

[Tazza]

do you have a link to the aux port relief ?

I never knew they existed, not a bad idea.