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Auxiliary hydraulics on an older Bobcat 743

Discussion in 'Skid Steers' started by Caesar Monterey, May 4, 2022.

  1. Caesar Monterey

    Caesar Monterey Member

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    Recently purchased a Bobcat 743 (circa 1989). It has an aftermarket High Flow (my guess) auxiliary hydraulic system. The brand name decal is in poor condition but appears to be Hydra-Pak. The Hydra-Pak consists of a custom engine compartment rear hatch. The hatch encloses the pump, supply tank, solenoid control valves (2 valves), and filters. The pump is driven by a driveshaft connected to the engine dampener. Controlling the hydraulic flow is performed via two electrical buttons affixed to the top of the Bobcat’s direction control arms.

    I have not been able to find any information about this system. Any insight to this Hydra-Pak is appreciated.
     
  2. Vetech63

    Vetech63 Senior Member

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    Can you take some pics of the components and post them?
     
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  3. Caesar Monterey

    Caesar Monterey Member

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    Vetech63, I will give it a try.
     
  4. Caesar Monterey

    Caesar Monterey Member

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    Three images of exterior P01.jpg P02.jpg P03.jpg
     
  5. Caesar Monterey

    Caesar Monterey Member

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    Three images of interior of Hydro-Pak P04.jpg P05.jpg P06.jpg enclosure.
     
  6. Caesar Monterey

    Caesar Monterey Member

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    Four additional images of interior components.
     

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  7. Caesar Monterey

    Caesar Monterey Member

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    This is a Davis backhoe that came with the Bobcat. Don't know if it works yet. The hydraulic fittings are sized for the stock Bobcat auxiliary hydraulics.

    Hopefully, "thumbnails" make for easier viewing.
    P11.jpg
     
  8. Vetech63

    Vetech63 Senior Member

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    Its not factory that I've ever seen. Nevermind... you already knew that!
     
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  9. Caesar Monterey

    Caesar Monterey Member

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    Vetech63, thanks for taking time to look at this Unicorn hydraulic system.
     
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  10. Bumpsteer

    Bumpsteer Senior Member

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    Interesting, very interesting.
    Never seen anything like it. (I have a 743). Can't imagine its good for much with the 36hp the 743 makes. Sure don't need it for a backhoe.

    Ed
     
  11. willie59

    willie59 Administrator

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    I agree with Bumpsteer, that's a purpose built modification to that machine for a specific task that requires high flow, such as a mulcher or flail mower. But at the same time a 743 was not a top fuel dragster when it comes to engine power. I can't imagine anything an individual would do that would need that system on that machine.
     
  12. Bloody Knuckles

    Bloody Knuckles Active Member

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    Hydro-pack is a Euro based hyd company, Bulgaria. Found this on their website, just an example. I didn't find any add on kits but hard to say what was available 25 - 30 years ago. That or somebody got a wild hair.

    Group 30 Hydraulic Gear Pump, 50 cc/rev, anti-clockwise , SAE-B 2 bolt flange , 13 teeth splined SAE shaft , 30A50X236
    Displacement
    50 cc/rev
    Rotation
    anti-clockwise
    Flange Type
    SAE-B 2 bolt flange
    Shaft Type
    13 teeth splined SAE shaft
    Ports
    flanged connection
    Max. Pressure
    200 bar
    Max. Speed
    2000 rpm
    Serie
    30A50X236
     
  13. Vetech63

    Vetech63 Senior Member

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    What are you wanting to know about this contraption? Are you wanting to run that backhoe with it?
     
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  14. Caesar Monterey

    Caesar Monterey Member

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    Hi all, thanks for the replies. Good to know some specifics on this. I do not have a use for the pump. Mostly, just curious about it and how others were using it. Definitely, looks like it was a costly upgrade. As of yesterday, the external hoses have been removed and put in storage. Now the Bobcat looks like a normal 743 with "junk in the trunk" due to the large rear hatch.

    The backhoe will use the standard auxiliary hydraulics. When I start work on it, I will start a new thread as I already have questions.
     
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