Adding a QH circuit.

[Keif]

What valve do yall suggest for adding a hydraulic quick hitch to an excavator that didn't come with one?

 

[CPS]

You'll need one like this

 

[V8Druid]

View attachment 51734
You'll need one like this

with a relief in the manifold

 

[CPS]

with a relief in the manifold

No relief valve needed

 

[V8Druid]

with a relief in the manifold

without a relief you are constantly dead ending whatever circuit you use for operating the QH's piston -- the relief is usually on the close side only as it's rarely open, for long. Maintains full pressure and dumps excess, without overloading the system/circuit - if pressure drops in the close side, the relief stops dumping and compensates until full pressure is returned to the piston/cylinder

 

[V8Druid]

No relief valve needed

how do you manage that? it'll be constantly dead ending whatever circuit you use? or are you piggy backing with another service?

 

[Keif]

View attachment 51734
You'll need one like this

For this style solinoid you would tap into the bucket curl circuit for it to operate?

 

[Keif]

without a relief you are constantly dead ending whatever circuit you use for operating the QH's piston -- the relief is usually on the close side only as it's rarely open, for long. Maintains full pressure and dumps excess, without overloading the system/circuit - if pressure drops in the close side, the relief stops dumping and compensates until full pressure is returned to the piston/cylinder
View attachment 51740 View attachment 51739 View attachment 51738

For this style solenoid you would hook into the pump output circuit for it to operate?

 

[V8Druid]

For this style solenoid you would hook into the pump output circuit for it to operate?

yep - my 'Drema uses the Delta output off the pump ... can open the hitch at any angle i like ... great for forks/grabs/VA-r

 

[Keif]

I bought this valve a couple years ago for a different project and never used it. Would it work for the QH?

 

[CPS]

Send a better picture off the schematic on the top please

 

[CPS]

Here is a schematic for a UK standard quick hitch circuit

 

[Keif]

 

[CPS]

It is the same circuit, but its a weird looking valve.
Are you sure it is a 12V dc coil on it?

 

[Lancs Lad]

He'll be up soon...

 

[Mick-the-fitter]

How is the check valve at EXT working (oil in only)?

 

[Keif]

It is the same circuit, but its a weird looking valve.
Are you sure it is a 12V dc coil on it?

Yeah.

 

[Left hooker]

how do you manage that? it'll be constantly dead ending whatever circuit you use? or are you piggy backing with another service?

Straight off the pump soon as engine fires it's wanting to hold shut constantly

 

[Keif]

I ended up getting a kit from Engcon. Seemed the best way.

Looks like a good kit but with some unexpected parts.

1. A nitrogen pressure accumulator. Reminds me of what we called the “bomb” on old Audi with hydraulic brakes assist instead of vacuum.

2. A valve for locking the slew.

Now I have to find a place for it all then get hoses made.