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  #1  
Old 06-11-2022, 12:47 PM
wedicotrucker wedicotrucker is offline
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Default Graupner loader

Hi guys, it's been a while.
A couple years ago I bought a graupner bucket loader, its works very well, with the exception of the steering. It's way to fast. It goes pretty much from lock to lock about as fast as any high speed steering servo.
Is there any way to slow down the speed of the hydraulic cylinders?
The rest of the hydraulics work well enough, and dont operate any where near the speed of the steering hydraulics.
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  #2  
Old 06-11-2022, 02:03 PM
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Default Re: Graupner loader

Those are rare! Congrats on getting one The easiest way to to it would be to do an expo or limit on the steering channel in your radio.
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Old 06-11-2022, 11:27 PM
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Default Re: Graupner loader

There are also 'Servo-Slow circuits' if your radio doesn't allow that option.
Mounted as pass-through between Rx and your Servo. Commonly used for stuff like slowing down transit speeds for aircraft Landing Gear
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Old 03-30-2023, 12:29 AM
wedicotrucker wedicotrucker is offline
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Default Re: Graupner loader

I've limited the steering end points, it did help a little but it still is far to fast. The steering speed makes this tractor almost useless. Thinking about increasing the size of the steering cylinders hoping that that will slow it down to a more usable speed.
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Old 03-30-2023, 08:28 PM
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Default Re: Graupner loader

Oh, so that's a hydro machine?

Steering EPA limits how much it opens the block at full stick.

Expo lets you reduce the stick sensitivity around center-point so you can crack the block open more precisely. Start somewhere between a Lot and All of the expo. Then tighten up end points as needed.

https://youtu.be/qunXBFlG1Hk


Slow down your hydro pumps esc channel with tighter epa.
Lower the working pressure with the bypass valve

Maybe use some Channel Mix so that the Scoop and Curl channels can kick the pump speed higher when moving those, then when those sticks center drop pump back slower for drive functions

Or if you're really feeling old school and just don't like making radio adjustments, make some Restrictor plates or 'slow-down' blocks that will limit speed of fluid volume transfer to steering rams.

Also with articulated stuff there's a lot of unlearning how to turn. It's really unnatural feeling to slowly turn in, then set the stick neutral while machine moves through the turn, then counter steer the turn to straighten back out. It makes sence doing that with Drifting a car, but feels wrong on a big lumbering machine that's all Grip

Be sure to let us know how it's doing next year
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Last edited by frizzen; 03-30-2023 at 08:39 PM.
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Old 01-23-2024, 01:56 PM
wedicotrucker wedicotrucker is offline
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Default Re: Graupner loader

The hydraulic pump is on its own esc, and I've adjusted the end olpoints on the steering servo, but I'm my opinion it's still a bit to fast.

I recently purchased a wedico Cat 966, I absolutely love this machine.
I currently have the Graupner loader sold, buyer still to pay.

Until it's officially gone, I will continue to work on the Graupners hydraulics.
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