adding snow plow

[danells]

I have an LA525 Loader and am adding a quick disco snow plow. The plow has 2 single action cylinders. Can I plug the Hydraulic lines from the plow into the hydraulic control block connectors used for the bucket cylinders (dual action)??

 

[GreensvilleJay]

you 'should' be able to......
...when you turn plow left, the right cylinder will pivot the blade to the left, and the blade forces the oil from the left cylinder back through the control valve ??

 

[TheOldHokie]

I have an LA525 Loader and am adding a quick disco snow plow. The plow has 2 single action cylinders. Can I plug the Hydraulic lines from the plow into the hydraulic control block connectors used for the bucket cylinders (dual action)??

Should work but that loader valve has regen on the bucket so it may angle faster in one direction versus the other and angling force will be reduced in one direction. If any of that becomes an issue you can always add an inexpensive single spool valve to the circuit to control angling. Valve is $100 plus hoses and fittings. Also need to watch out - the couplers on the valve are not standard agricultural couplers and you will need to get the correct ones.

Edit:

I just walked out and checked. The couplers on my 2021 LA525 are Faster HNV series - 3/8 ISO 7241B poppet valve couplers. So be aware - they do not interchange with 3/8" agricultural couplers.

Dan

 

[danells]

Should work but that loader valve has regen on the bucket so it may angle faster in one direction versus the other and angling force will be reduced in one direction. If any of that becomes an issue you can always add an inexpensive single spool valve to the circuit to control angling. Valve is $100 plus hoses and fittings. Also need to watch out - the couplers on the valve are not standard agricultural couplers and you will need to get the correct ones.

Edit:

I just walked out and checked. The couplers on my 2021 LA525 are Faster HNV series - 3/8 ISO 7241B poppet valve couplers. So be aware - they do not interchange with 3/8" agricultural couplers.

Dan

THANKS

Ok - so here is what i have going on now.
When I hook the single cyl plow to the connections that WERE used by the tilt cyls - the plow angles in one direction - not the other. If I sway the 2 lines on the control valve - the plow angles the other direction. It seems like the flow BACK to the valve is not working. ( BTW I am using the faster HNV quick discos)

Is there a flow valve - maybe the flow is to high for the plow cyls??

 

[danells]

you 'should' be able to......
...when you turn plow left, the right cylinder will pivot the blade to the left, and the blade forces the oil from the left cylinder back through the control valve ??

this seems to be the issue - the flow back to the control valve

 

[TheOldHokie]

THANKS

Ok - so here is what i have going on now.
When I hook the single cyl plow to the connections that WERE used by the tilt cyls - the plow angles in one direction - not the other. If I sway the 2 lines on the control valve - the plow angles the other direction. It seems like the flow BACK to the valve is not working. ( BTW I am using the faster HNV quick discos)

Is there a flow valve - maybe the flow is to high for the plow cyls??

I think regen is getting in the way. I should have thought this out better the first time.

1. Regen redirects the return flow back into the pump flow going to the extend port rather than allowing it to go to tank.
2. As a result the pump is connected to the base end of both cylinders.
3. In a DA cylinder the base and rod end piston working areas are different and a force imbalance allows the rod to move faster but with reduced actuating force.
4. In the two SA cylinders the working areas are the same and the forces are balanced so the circuit is hydraulically locked.

Edited multiple times to reflect my thinking after a bit more study.

Dan

 

[danells]

so w

I think regen is getting in the way. I should have thought this out better the first time.

1. Regen redirects the return flow back into the pump flow going to the extend port rather than allowing it to go to tank.
2. As a result the pump is connected to the base end of both cylinders.
3. In a DA cylinder the base and rod end piston working areas are different and a force imbalance allows the rod to move faster but with reduced actuating force.
4. In the two SA cylinders the working areas are the same and the forces are balanced so the circuit is hydraulically locked.

Edited multiple times to reflect my thinking after a bit more study.

Dan

So what are my options??

 

[TheOldHokie]

so w


So what are my options??

My original suggestion - add an inexpensive valve. Here is the one I put on my LA525 for exactly this purpose. Its a 8 GPM Wolverine MB series and probably $175 total including hoses and fittings. I am sure you can something even less expensive

Dan

 

[danells]

Ordered one of these:

Amazon.com

Spoke with Kubota - they said to move the PB (green) line from the old COntrol block to the new then a short host back to the control block from the new block outflow

Will this work with my single action cyls??

 

[old and tired]

My original suggestion - add an inexpensive valve. Here is the one I put on my LA525 for exactly this purpose. Its a 8 GPM Wolverine MB series...

Isn't that still for a double acting cylinders??

 

[danells]

Isn't that still for a double acting cylinders??

Agree - how can you tell if a valve is going to work??

 

[TheOldHokie]

Ordered one of these:

Amazon.com

Spoke with Kubota - they said to move the PB (green) line from the old COntrol block to the new then a short host back to the control block from the new block outflow

Will this work with my single action cyls??

It will work but it is not the best choice. That valve has no power beyond capability and is not intended for for use in a power beyond circuit. a better choice at the same price:

Monoblock Hydraulic Directional Control Valve, 1 Spool, 11 GPM

Monoblock Hydraulic Directional Control Valve, 1 Spool, 11 GPM

summit-hydraulics.com

You will also need the power beyiond sleeve which is another $24.

Plumb it as follows:

1. Disconnect loader Power Beyond hose at hydraulic oullet block and reconnect it to the IN port on the new valve. You may need a replacement hose for the shorter run.
2. Connect the Power Beyond port on the new valve to the port on the hydraulic outlet blokc where loader was previously connected. You may be able to repurpose the old loader hose.
3. Connect the tank port on the new valve to the tank return line from loader valve. I used a JIC run tee as shown in this photo. I disconnected the loader tank return hose at the hydraulic block and reconnected it to the center leg on the tee. I then ran a new hose from the end of the run tee back to the hydraulic block.

There are other ways to run the tank return hoses but I found that to be the simplest and neatest.

Dan

 

[TheOldHokie]

Agree - how can you tell if a valve is going to work??

A standard tandem center DA valve where both work ports return to tank will work fine controlling two opposed single acting cylinders. Your problem is the spool on the l;oader vavle is not a normal DA spool. It has a regeneration circuit where in one direction the work ports are both connected to the pump for rapid extend. That does not work with two single acting cylinders.

Dan

 

[danells]

A standard tandem center DA valve where both work ports return to tank will work fine controlling two opposed single acting cylinders. Your problem is the spool on the l;oader vavle is not a normal DA spool. It has a regeneration circuit where in one direction the work ports are both connected to the pump for rapid extend. That does not work with two single acting cylinders.

Dan

Awesome thank you for taking the time to explain to a newbie!!!!!!

Have a great Holiday !!!

Dan

 

[TheOldHokie]

Awesome thank you for taking the time to explain to a newbie!!!!!!

Have a great Holiday !!!

Dan

I updated the photo in the earlier post with some legends.

Dan

 

[TheOldHokie]

Awesome thank you for taking the time to explain to a newbie!!!!!!

Have a great Holiday !!!

Dan

You are welcome but I should have given it more thought before my original erroneous reply.

Dan

 

[danells]

It will work but it is not the best choice. That valve has no power beyond capability and is not intended for for use in a power beyond circuit. a better choice at the same price:

Monoblock Hydraulic Directional Control Valve, 1 Spool, 11 GPM

Monoblock Hydraulic Directional Control Valve, 1 Spool, 11 GPM

summit-hydraulics.com

You will also need the power beyiond sleeve which is another $24.

Plumb it as follows:

1. Disconnect loader Power Beyond hose at hydraulic oullet block and reconnect it to the IN port on the new valve. You may need a replacement hose for the shorter run.
2. Connect the Power Beyond port on the new valve to the port on the hydraulic outlet blokc where loader was previously connected. You may be able to repurpose the old loader hose.
3. Connect the tank port on the new valve to the tank return line from loader valve. I used a JIC run tee as shown in this photo. I disconnected the loader tank return hose at the hydraulic block and reconnected it to the center leg on the tee. I then ran a new hose from the end of the run tee back to the hydraulic block.

There are other ways to run the tank return hoses but I found that to be the simplest and neatest.

Dan

The service guy at Kubota said simpy remove the PB line from the Loader control valve and connect it to the input side of the new valve. Then run a jumper from the outflow of the new valve back to the PB port on the old valve. Sounds simple enough??

View attachment 72532

 

[danells]

You are welcome but I should have given it more thought before my original erroneous reply.

Dan

The service guy at Kubota said simpy remove the PB line from the Loader control valve and connect it to the input side of the new valve. Then run a jumper from the outflow of the new valve back to the PB port on the old valve. Sounds simple enough??

 

[TheOldHokie]

The service guy at Kubota said simpy remove the PB line from the Loader control valve and connect it to the input side of the new valve. Then run a jumper from the outflow of the new valve back to the PB port on the old valve. Sounds simple enough??

It is simple enough if you want to ignore the fact the OUT port on that valve is not rated for the pressures that it will be subjected to when you raise a load on the 3pt. It will definitely work but the valve is is only rated for maybe 500 PSI and you are using in a system that could see 2200 PSI. People do it all of the time and USUALLY get away with it but you MAY experience seal or less likely mechanical failures from the over pressurization. We just had a LONG thread on Kubota backhoes about those factory valves being used in this fashion and the seal failures it produces. I suggest that if at all possible you do it correctly and use a valve with a power beyond circuit.

Dan