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950H hyd. query

Queenslander

Queenslander

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We have a 950H, JAD02141...an IT version with fusion coupler and third function.
Just wondering if there is an option to electronically change the operation of the third function, ie. make it float.
I recently had a stickrake made for the loader and added a hydraulic tilt option.
Just a ram operated off the third function to make it easier to use in undulating country.
It works OK, but puts a lot of strain on the ram which, inevitably, ended up breaking.
On the way back to the workshop, I tested it without the ram attached and found it much better to use.
Being able to flick it into float would also take the load off the ram.
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hvy 1ton

hvy 1ton

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I think replacing the 3rd function valve with one that can float would work. If all the rake needs to do is follow the ground, does it need the tilt cylinder?
 
John C.

John C.

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I would think that the float function would have to be in the hydraulic valve. What if you just set the circuit relieve pressure down real low? Less that a thousand PSI relief might be all you need for the blade to float either way and you would still be able to tilt when you picked up the blade.
 
Queenslander

Queenslander

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That might just be enough John C, I still need to be able to tilt the rake to fish timber out of holes and the like.
At the moment, all that flow going into that little ram causes the rake to tilt way to fast, so lowering the reliefs might help with that as well.
I would have thought that with the myriad of attachments that could be fitted to a machine like this, they could have had a few options to control flow, a detent at the least.
 
John C.

John C.

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I think there is some type of PWM control for that would be handled by software like the boom and tilt functions. I recall machines with clams that had the rockers on the control handle that gave you feel on how fast you wanted the top clamp to open and close.
 
funwithfuel

funwithfuel

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What about stupid simple, like an inline variable restriction or snubber valve. Or would that generate too much heat. Just spit ballin.
 
Nige

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G..G..G..Granville.........!! Fetch your cloth.
We have a 980H fitted with a tyre handler that operates using the 3rd function. The tyre handler requires a flow of no more than 12gpm at 2500psi. In the circuit between the 3rd function valve in the cab and the tyre handler is a flow control valve that is adjustable for both max line pressure and flow, dumping the overflow back to tank. Would something like that work in your application..?
 
Queenslander

Queenslander

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Iam no hydraulic expert, but I reckon it would.
If it’s dumping to the tank, could I put a solenoid actuated valve there to make it float as well?
 
hvy 1ton

hvy 1ton

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With a flow control valve, hitting relief constantly might cause heat issues. Depends on how often and far the cylinder needs to move to follow the ground.
 
Queenslander

Queenslander

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It would be constantly moving, but mostly only very small amounts.
On any dozer that I’ve ever raked with, there is usually sufficient play in the blade to allow for these small movements.
With this loader, if a wheel rolls into a small hole, for example, it forces one side of the rake into the ground and stresses the tilt ram.
 
John C.

John C.

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Another idea might be to install accumulators on each side of the cylinder like is done on grader lift cylinders. A flip of a switch would allow either side to bounce on the nitrogen but you could turn the system off at any time you needed to corner something out.
 
Queenslander

Queenslander

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Been thinking about accumulators.
What about some sort of valve to open both sides of the ram and connect them, with a lightly loaded accumulator to accomodate the differing displacements?
At this stage, I can live with the speed issue but I think it is essential that I get it to float.
 
John C.

John C.

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Good thinking! I think you could get a two way solenoid actuated valve with a single spool pretty easy. Have a spring pushing to separate the circuits and the solenoid on to join both sides of the cylinder together. I don't think you would even need the accumulator.
 
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