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Case 85XT with brush cutter
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<blockquote data-quote="richard" data-source="post: 2221" data-attributes="member: 285"><p>I have since purchased a service manual for this machine and I think I now know what is causing the problem. The hydraulic pump also serves as a charge pump for the hydrostatics. When the levers are in neutral, all of the flow is directed to the equipment port (for the loader arms, attachments, etc.). Then when you move the levers forward or backward, a shuttle valve on the drive motors opens up to allow fresh fluid to enter the motor to keep it cool. When this happens there is an initial surge of flow to the motors and this flow is taken away from the equipment port. The manual states this is a 2 gpm loss immediately (and this is on a new machine with no wear). This sudden surge/loss of flow is what is causing the brush cutter to surge. When your cutting brush, you move back and forth alot, and this gets very annoying. It seems that this may just be something inherent to the design of the machine and there's nothing I can do about it. I guess if it was a highflow machine with a separate hydraulic pump just for the attachments then I wouldn't have this problem. I don't know, maybe I can come up with some way to make this work. Right now, I'm at a loss.</p></blockquote><p></p>
[QUOTE="richard, post: 2221, member: 285"] I have since purchased a service manual for this machine and I think I now know what is causing the problem. The hydraulic pump also serves as a charge pump for the hydrostatics. When the levers are in neutral, all of the flow is directed to the equipment port (for the loader arms, attachments, etc.). Then when you move the levers forward or backward, a shuttle valve on the drive motors opens up to allow fresh fluid to enter the motor to keep it cool. When this happens there is an initial surge of flow to the motors and this flow is taken away from the equipment port. The manual states this is a 2 gpm loss immediately (and this is on a new machine with no wear). This sudden surge/loss of flow is what is causing the brush cutter to surge. When your cutting brush, you move back and forth alot, and this gets very annoying. It seems that this may just be something inherent to the design of the machine and there's nothing I can do about it. I guess if it was a highflow machine with a separate hydraulic pump just for the attachments then I wouldn't have this problem. I don't know, maybe I can come up with some way to make this work. Right now, I'm at a loss. [/QUOTE]
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Case 85XT with brush cutter
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