Flow Control

[binaryviking]

Ok , So I would have to get adapters for this 1/4'' flow valve to fit my "5-JIC" fittings, which are 1/2", correct?

 

[scootr]

I've been trying to remedy the same challenge recently myself. Bought a Chinese claw that is way to fast unless the machine is idling. Long story short > JIC5 too small JIC6 too big = I have a nice valve with 1/4" NPT female inlets. I'm going to cut a hose and take it to the hose shop. Then ask them to put a 1/4 NPT male on both ends of the cut where I will install the valve.

 

[ptsg]

Ok , So I would have to get adapters for this 1/4'' flow valve to fit my "5-JIC" fittings, which are 1/2", correct?

Yes, you'll need adapters. About the size, I can't really help you but if the hydraulic shop saw the fittings, they'll know better than me.

 

[binaryviking]

Ok thanks for all of the help , I really appreciate it, Helped out tons.

 

[oldnslo]

Ok , So I would have to get adapters for this 1/4'' flow valve to fit my "5-JIC" fittings, which are 1/2", correct?

#5 SAE is an odd ball size rarely used but yes that would be 1/2- 20 UNF thread. You almost need to measure the thread diameter and number threads per inch or millimeter if metric to determine style of fitting. You also need to measure angle of seat if there a is a tapered seat. Standard JIC is 37 degrees but there is also a metric 30 degree that looks very similar but does not interchange.

 

[ericm979]

I put the 5gpm valves linked above on various circuits on my Branson backhoe. The boom was way too fast and jerky. The bucket curl speeds up as it reaches its stop on extension, slams into the stop and ejects much of the material in the bucket. I can get it right about half the time.

I put the valves on the cylinder ends of the hoses so I could get to them to adjust them. There's two on the boom cylinder and I can reach them from the operators seat.

I'm not an experienced backhoe operator but I have about 20 hours on this one. As I got better I could operate multiple controls at once but that wasn't enough to make the boom or the bucket curl behave predictably. Selectively slowing the hydraulics helps. I think the valves on this backhoe are just cheap.

These restrictor valves are one way. I set them up to restrict flow out of the cylinder. JIC5 is usually on a 5/16 hose. It's its own standard, not SAE or NPT. You'll need NPT to JIC adapters for the valves, one male and one female JIC with male NPT on each.

 

[binaryviking]

I put the 5gpm valves linked above on various circuits on my Branson backhoe. The boom was way too fast and jerky. The bucket curl speeds up as it reaches its stop on extension, slams into the stop and ejects much of the material in the bucket. I can get it right about half the time.

I put the valves on the cylinder ends of the hoses so I could get to them to adjust them. There's two on the boom cylinder and I can reach them from the operators seat.

I'm not an experienced backhoe operator but I have about 20 hours on this one. As I got better I could operate multiple controls at once but that wasn't enough to make the boom or the bucket curl behave predictably. Selectively slowing the hydraulics helps. I think the valves on this backhoe are just cheap.

These restrictor valves are one way. I set them up to restrict flow out of the cylinder. JIC5 is usually on a 5/16 hose. It's its own standard, not SAE or NPT. You'll need NPT to JIC adapters for the valves, one male and one female JIC with male NPT on each.

Thanks for the information. So these are the adapters I ordered for the control valve below.

 

[ptsg]

Thanks for the information. So these are the adapters I ordered for the control valve below.

Please cancel that order ASAP. Those fittings are not meant for hydraulic pressures at all!! Get proper hydraulic fittings that can handle thousands of PSI.

 

[jigs_n_fixtures]

The problem many small tractors have with their controls, and the over sensitivity, is because most valve manufacturers desing their tractor valves for 10 to 13-gpm flows, and larger. I have only seen one loader valve rated for 5-gpm.

Most smaller tractors have pumps that are only capable of five or six-gpm. This is aggravated by the fact that to keep the mechanical loads down on the lighter weight 3-pt, and loader, they have small cylinders. Which while they don’t generate as much force, move much further with the same amount of fluid volume. You have trouble getting low flow rates through a valve which is twice as large as it needs to be, filling the smaller diameter cylinders more quickly, in response to that volume of oil.

I’m toying with installing larger diameter cylinders, with a lower pressure bypass valve. This would limit the force on the equipment to around what the factory force is, while making the response less quick.

That said with a long learning curve, I am learning to control the motions better using the joystick on the loader. And can now make slower more precise movements.. That said it would have been easier if things moved slower for the same volume of fluid. And doubling the size of the cylinders makes them 4 times slower, with a 4 fold increase in force. Cut the pressure to one 1/4th of the factory, and you cut the force, back to factory, while still being slower reacting.

 

[binaryviking]

Please cancel that order ASAP. Those fittings are not meant for hydraulic pressures at all!! Get proper hydraulic fittings that can handle thousands of PSI.

Ok they have been canceled. I'm going to visit our local tractor shop and see that they have.