Class telehandler too sensitive tilt ram

[JohnDeere8530]

Have a Targo K series that’s mainly used just for pushing up grain in a store with a 5m grain pusher

problem is esp with seasonal workers the tilt ram is far far too sensitive. Touching the joystick results in huge movements of the pusher, placing a lot of shock on the system

Anyone know if the sensitivity can be reduced day by 50% ?

 

[suffolksmallholder]

If these are servo hydraulic then certainly but where is that particular unit.
They do light up when in operation so this may be a two person job and be careful. I have heard some horrendous stories where people have been fidddlin’ and come off worse.
SS

 

[JohnDeere8530]

Just want to slow the oil supply to the tilt ram or desensitise the joystick

 

[suffolksmallholder]

Just want to slow the oil supply to the tilt ram or desensitise the joystick

Find the valve block for starters then adjust.
On my tractor adding an adjustable restrictor was my way forward.
SS

 

[Jasper]

Years ago we used to put restrictors in some pipes to slow things down like a tap you turned worked well

 

[JohnDeere8530]

I was thinking the same. Would have to be on both pipes even though oil always flows in both pipes no matter what direction the ram is moving in ?

 

[JohnDeere8530]

Something like this ?

 

[ACEngineering]

Something like this ?

first make sure the self leveling ram pins and bushes are not knackered as play on these will make movements with a long pusher difficult to control.

second if you fit a restrictor do it before the self leveling ram, you do not want to restrict any oil getting from the self leveling ram to the tilt ram as this will cause you problems.
You will also need 2 restrictors and they will need to be free flow return type so your only restricting the oil going to the ram on either pipe but not restricting the flow back. Also there will be more flow/volume returning when the ram is closing so make sure it can cope with the flow/volume returning from piston side of ram.

The above would apply to any handler, i dont know the claas targo well enough to know if there is an easier way to make it less responsive or not.

 

[JohnDeere8530]

Thanks for this

Claas targo is a simple system much like a Manitou of that age - just basic electronic joystick.


I see what you mean. If I restrict oil supply too much to the tilt ram, when the main boom is lifted or lowered quickly, oil may not be able to escape at a sufficient rate from the compensation ram - resulting in something bending ?

Like you say if I put the valve on the pipe leaving the spool block it may work? I cant get my head around if that would starve both compensation ram and tilt ram of oil. I think probably not though

All pivots etc are in a1 condition as there is less than 3k hrs on it

 

[ACEngineering]

Thanks for this

Claas targo is a simple system much like a Manitou of that age - just basic electronic joystick

I see what you mean. If I restrict oil supply too much to the tilt ram, when the main boom is lifted or lowered quickly, oil may not be able to escape at a sufficient rate from the compensation ram - resulting in something bending ?

Like you say if I put the valve on the pipe leaving the spool block it may work? I cant get my head around if that would starve both compensation ram and tilt ram of oil. I think probably not though

restrictors on the pipes out of the spool block before the tee for the self leveling ram will not affect the self level circuit.

the problem is is there enough room to do it before the tee, and how easy will it be to access because you will have to adjust it everytime you go back to a bucket!

 

[Mr Happy]

What make of spool valve is fitted?

 

[sheep boy 3000]

Has the machine been like this since new?
I had problems with our quickie loader acting strange and jumping up when tilting the bucket back.
Nobody, not even quickie could solve it. Eventually it was solved after mentioning it to a friend who had heard of the problem.
Turns out the pipes were connected wrong. After shifting a couple around it has been fine ever since

 

[ACEngineering]

Thanks for this

Claas targo is a simple system much like a Manitou of that age - just basic electronic joystick.


I see what you mean. If I restrict oil supply too much to the tilt ram, when the main boom is lifted or lowered quickly, oil may not be able to escape at a sufficient rate from the compensation ram - resulting in something bending ?

Like you say if I put the valve on the pipe leaving the spool block it may work? I cant get my head around if that would starve both compensation ram and tilt ram of oil. I think probably not though

All pivots etc are in a1 condition as there is less than 3k hrs on it

uni directional is what you want, here is a 3/4bsp example below more expensive that one in your pic but you can see the actual sizes of it on the sparex site and work out if there even room to fit a pair of them or not.
I'm not even sure 80litres flow will be enough tbh, possibly get away with it on the rod side but not on the piston side of ram.

https://gb.sparex.com/marchesini-uni-directional-flow-control-valve-3-4-bsp-80-l-min-flow-rate-167160.html

 

[JohnDeere8530]

restrictors on the pipes out of the spool block before the tee for the self leveling ram will not affect the self level circuit.

the problem is is there enough room to do it before the tee, and how easy will it be to access because you will have to adjust it everytime you go back to a bucket!

Actually thinking about it. There must be an oil bypass from the compensation ram to dump oil if the tilt ram is at either extreme when the boom is lifted ?

Therefore it shouldn’t matter where the valve is fitted - unless this dump valve is on the outside of the tilt ram itself ? This is unlikely though, as oil can then only be dumped from say the crowd circuit (assuming pallet tines are fully tilted up) to the tilt down circuit. This couldnt happen as the compensation ram has a different diameter each side due to the rod - so you’d get hydraulic lockup

Edit
Thinking about it more if the restrictor was between compensation and tilt ram (ie in most convenient place) it would likely cause partial loss of the self leveling ability of the pallet tines. This is because some of the oil leaving the compensation ram would likely be dumped, due to the restrictor

Nothing is simple

 

[JohnDeere8530]

What make of spool valve is fitted?

Tbh I’m not entirely sure. I assume a generic one probably fitted to many other telehandlers around 2005 ?

 

[ACEngineering]

Actually thinking about it. There must be an oil bypass from the compensation ram to dump oil if the tilt ram is at either extreme when the boom is lifted ?

Therefore it shouldn’t matter where the valve is fitted - unless this dump valve is on the outside of the tilt ram itself ? This is unlikely though, as oil can then only be dumped from say the crowd circuit (assuming pallet tines are fully tilted up) to the tilt down circuit. This couldnt happen as the compensation ram has a different diameter each side due to the rod - so you’d get hydraulic lockup

Edit
Thinking about it more if the restrictor was between compensation and tilt ram (ie in most convenient place) it would likely cause partial loss of the self leveling ability of the pallet tines. This is because some of the oil leaving the compensation ram would likely be dumped, due to the restrictor

Nothing is simple

oh my bad I forgot about that! The circuit relief valves on self level circuits are normally in side the spool block. But so long as using restrictor with a free flow return will still be okay at the spool block end before tee to self level ram.

 

[suffolksmallholder]

I fitted pretty much what has been shown. Adjusted and locked off it has worked faultlessly for sixteen years.
I can lower my loader fully loaded with a 1 ton bag safely, and I’m in control. Before it just dropped like a stone which wasn’t great.
I swapped over the crowd rams pipework so I had lift-n-level on the pull of both levers snd the same on the down cycle so one-handed operation is simple and easy.
SS