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<blockquote data-quote="IndianaJohn" data-source="post: 74310" data-attributes="member: 10633"><p>Well, I stumbled across a posting in a forum last night where someone mentioned that these machines used a 48 GPM pump. Now to me, that seems waaaaayyy too much for the modest hydraulic needs of these units. After all, it's primary load is just those little cylinders that lift and tilt the bucket. 48 GPM would be serious overkill to me. Maybe they meant 4.8 GPM instead. Would make a lot more sense. Of course if I do try the hydraulic hybrid drive idea, I'm sure I'll need a bit more than flow than the stock pump would provide. But first, I need to figure out what the motor requirement would be. I know what the torque specs of the VH4D are, which gives me a starting point, but I'm also guessing I will need to know the maximum speed required as well. I've had some training and experience with hydraulic systems, but I'm no engineer. I'm hoping the operators and parts manuals will give me some useful information when they finally arrive. There doesn't appear to have ever been an actual service manual. Would love to find out whoever it was that you mentioned tried this before so I could pick their brain for info. Would save me a lot of time and trouble. Since pumps and motors aren't exactly cheap, I'd like make sure I get the right ones to start with.</p></blockquote><p></p>
[QUOTE="IndianaJohn, post: 74310, member: 10633"] Well, I stumbled across a posting in a forum last night where someone mentioned that these machines used a 48 GPM pump. Now to me, that seems waaaaayyy too much for the modest hydraulic needs of these units. After all, it's primary load is just those little cylinders that lift and tilt the bucket. 48 GPM would be serious overkill to me. Maybe they meant 4.8 GPM instead. Would make a lot more sense. Of course if I do try the hydraulic hybrid drive idea, I'm sure I'll need a bit more than flow than the stock pump would provide. But first, I need to figure out what the motor requirement would be. I know what the torque specs of the VH4D are, which gives me a starting point, but I'm also guessing I will need to know the maximum speed required as well. I've had some training and experience with hydraulic systems, but I'm no engineer. I'm hoping the operators and parts manuals will give me some useful information when they finally arrive. There doesn't appear to have ever been an actual service manual. Would love to find out whoever it was that you mentioned tried this before so I could pick their brain for info. Would save me a lot of time and trouble. Since pumps and motors aren't exactly cheap, I'd like make sure I get the right ones to start with. [/QUOTE]
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