Quck-Connect vs. Residual Pressure

[DaveK OR]

I believe you have to find the cause for pressure? For example, is the hoe sitting on the stabilizers and the bucket??

You may well be right about that being the source of the problem. In storage, the hoe rests on the bucket and two points of its frame, so it would most likely be the dipper cylinder. I use the thumb to constrain the bucket, so its cylinder shouldn't be an issue. The boom has a locking pin, so it is also restrained, and that leaves the dipper cylinder. I can temporarily address the dipper cylinder issue by positioning it for storage so the forces don't transfer to the cylinder. The problem is that I want a minimum footprint for storage, so I'll need to find a way to restrain the dipper to minimize forces on the cylinder. There's no weight on the stabilizers, but restraining them in the storage position will help a little.

I need to think on that for a bit, since it will affect how I configure a rolling base for the hoe when it's in storage.

 

[Luke'sScreenName]

If the pressure is just from temperature expansion and the hoe-side connector is male this is a simple solution:
Pioneer 1/2 in. Connect Under Pressure Tip, 1/2 in. NPTF - For Life Out Here

If the pressure is from unsupported weight acting on the cylinders then you either need to support the weight or install shut-off valves:
Pioneer 1/2 in. Connect Under Pressure Kit, Upgrade Your Tractor - For Life Out Here

:2cents:

 

[ovrszd]

Good idea Luke.

Quality shutoff valves in the main hoe to tractor hoses would allow the hoe to be parked with pressure on any of the cylinders and not cause reconnection problems.

 

[Luke'sScreenName]

Just to clarify, I doubt the shut-offs I linked are the appropriate ones but just a handy example. TSC won't have what he needs IMO.

 

[ericm979]

Pioneer makes connect under pressure female ISO 5675-A connectors, and TSC sells them: Pioneer 1/2 in. Connect Under Pressure Two Way Sleeve ISO Interchange - For Life Out Here

Might be able to get them cheaper elsewhere like 82 Series Quick Disconnect Couplings (Pioneer) - Hoses & Fittings - Mid-States Equipment

Info: 1/2” Connect Under Pressure Quick Couplings, Breakaway Sleeve, Push Connect, Pioneer ISO 5675, 3 psi - 82 Series Couplers | Parker NA

(sorry to nerd out on this but I was researching it earlier and still had the tabs up)

I may be missing something but I don't see how the shutoff valves would help. If you close them when there's residual pressure, wouldn't there still be pressure between the shutoff and the coupler? You'd have to close them after relieving pressure. At that point there's no need for them. With the typical ag coupler setup of females on the tractor (where you can relieve pressure) its the male side where the connect under pressure couplers would be the most use.

 

[ovrszd]

(sorry to nerd out on this but I was researching it earlier and still had the tabs up)

I may be missing something but I don't see how the shutoff valves would help. If you close them when there's residual pressure, wouldn't there still be pressure between the shutoff and the coupler? You'd have to close them after relieving pressure. At that point there's no need for them. With the typical ag coupler setup of females on the tractor (where you can relieve pressure) its the male side where the connect under pressure couplers would be the most use.

No problem on the "Nerding".

So you are preparing to disconnect the hoe.

Shut the valves.

Relieve the tractor side pressure by wiggling the controller sticks.

Disconnect.

No residual pressure is built up against the quick couplers because the shut off valves are preventing that.

Later come back to reconnect the hoe.

No pressure to deal with because the valves have contained it.

Clear as mud right??

 

[Luke'sScreenName]

You close the valve BEFORE disconnecting or combine with connect-under-pressure QDs.

You need the shut-off if the pressure is from unsupported weight because you're unlikely to relieve enough fluid to connect (with just CUP QDs).

Edit: Richard beat me to it.

 

[Luke'sScreenName]

And nerding out on hydraulic problems is good for both mind and spirit! :thumbsup:

 

[ovrszd]

)

Edit: Richard beat me to it.

Great minds think alike!!!!

 

[Luke'sScreenName]

Great minds think alike!!!!

Then I must have been thinking something else! :drink: