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Geschrieben von ZM 15 am 27.04.2021 um 19:59:

 

Passt glaube ich ganz gut zum Thema

https://www.youtube.com/watch?v=R8bue9gVKTk

Gruss Arne

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Geschrieben von gumikutya am 28.04.2021 um 18:14:

  O&K RH75A documentations

Hello Members and Visitors

Here is an old RH75A in backhoe configuration, for long reach applications. /from 2014/

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Geschrieben von gumikutya am 29.04.2021 um 17:37:

  O&K RH75A documentations

Some more pictures:

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Geschrieben von gumikutya am 30.04.2021 um 17:48:

  O&K RH75A documentations

Hello Everyone!

More Rh75A pictures:

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Geschrieben von M60 am 30.04.2021 um 19:37:

 

Hello Victor,
Thank you very much for sharing all these great documents and pictures !
Were there any RH75 located in Hungary ? Where from did you get your special interest in this type of O&K ? Where is the RH75 shown in the last pictures located ?

Best Regards from Upper Bavaria
Christian

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Geschrieben von TEREXGERTS8 am 30.04.2021 um 22:53:

 

Hello Gumikutya , Victor ,

I want to join M60 in thanking you for sharing these magnificent pictures and information of the RH75 , very impressive to see the RH75 in comparison to the RH6 !! Also it is remarkable to see the design of the main boom with the top of the lift cylinders mounted inside the main boom instead of the mountings on each side of the main boom for the backhoe version , for the front shovel version also the lift cylinders for the main boom are mounted close to each other on the inside and the stick cylinders are mounted on the outside of the main boom and stick , which is just opposite of what became common and is common nowadays . It is obvious that engineers back in those days when O&K was developing this large excavator type were still experimenting in designing boom structures and finding out what would be the best way and position for mounting the hydraulic cylinders and distribute the massive loads which punish the boom structure and upper and under carriage of this massive excavator when the two Cummins diesel engines are pumping the hydraulic pressure to over 300 Bar !!
Thanks , Victor , and I hope there is more to come !

Greetings from Holland ,

TEREXGERTS8

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Geschrieben von gumikutya am 02.05.2021 um 17:51:

  O&K RH75A documentations

Dear Christian and Ger

Biggest O&K excavator in Hungary is an old RH40E front shovel, with a lot of working hours. It worked in an open pit lignite mine in Visonta at 2015. Today I don't know what is with the old O&K.
The machine on the pictures was for sale in the UK in 2014.

The RH75A is a very rare excavator and I think this is why I'm interested in this machine. I shared my collections with everyone, because there are few pictures and documentations on WEB.

I have two handbooks to this type, but the hydraulic schematics are missing from both handbooks as you can see on attached pictures.

I am looking for hydraulic schematics or hydraulic diagrams to RH75A bachhoe and / or front shovel configurations.

Can Anyone Help Me?

Best regards,

Viktor

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Geschrieben von Mathias_71 am 01.03.2022 um 15:21:

 

Hello Victor!
Sorry can’t help You with the hydraulic scheme…
but I would like to thank You for all the documentation
for the RH75A that You posted here. Just great:-)
Regarding the one on sale in UK 2014, it has a very
special cab, not the 75A nor 75C variant but something
in between, I think the machine looks much better with this cab.
Do You know from what year that machine
came? I would guess early 80s, like 82 or so,
because in 83 the RH120C came with the cab that
later also the RH75C have.

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Geschrieben von gumikutya am 17.04.2022 um 19:55:

 

Hello Mathias

Don’t worry for schematics, nobody can help me until today.



So, maybe this macnine was a special one.

Here are some datas about this old RH75A:

Production year: 1979

Working hours: 5239h (as you can see on pictures)

Two Cummins engines

Raised cab.

Main boom lenght: 10.75m

Dipper arm lenght: 4.27m

Special, ditch cleaning bucket.



Best regards,

Viktor