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706 hydraulics running a sprayer pump? Valve shuts

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andy

05-27-2004 20:22:38

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I wanted to spray some fence lines and a few weed patches in my fields. I purchased a 3 pt. sprayer with a hydraulic centrifical pump mounted on it. When I pull on the hydraulic lever it doesn't want to stay ON...the lever bounces back. Can I tie it in the ON position to keep the pump working? I know this is about open center and closed center valves. The pump also may not match the hydraulics of the tractor. What if I tie in an external by-pass into the hydraulic hoses and let some of the oil go back allowing just enough to run the pump? I would tee into each hose and put a valve in between. It is not like I am spraying entire fields with this. Just fence lines and spot spraying for now. Comments/help????? Thanks

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Jim

05-28-2004 04:33:22

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Re: 706 hydraulics running a sprayer pump? Valve s in reply to andy, 05-27-2004 20:22:38

In the back of your remote valve (under the seat) is a small plug, snaps in, about the size of a dime or smaller, snap it out, then with a screw driver that will fit in hole you can adjust the the detent release screw. Clockwise, increase, counter clockwise decrease the holding power. It wound't take much to change. There is many tractors with leavers locked in lift postion to run remote valves for loaders and other equipment. Jim

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Bob

05-27-2004 20:46:29

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Re: 706 hydraulics running a sprayer pump? Valve s in reply to andy, 05-27-2004 20:22:38

You can tie the valve in position and run the pump, so long as the hydraulic fluid does not overheat. (Extended use on a HOT day might cause overheating of the oil.)

The drive motors on some of the hydraulic driven centrifugal pumps have a built-in adjustment screw for pump speed.

On the pump motors designed for an open center system, this does what you are proposing, and allows hydraulic oil flow to bypass the motor and return to the tractor. If the motor is so designed, the farther you turn the screw "in" (CW), the less oil is allowed to bypass, and the pump runs faster.

On the motors of pumps designed for closed center systems, the adjustment screw is on the inlet line going into the motor, and the farther the screw is turned out (CCW), the more constant-pressure oil from the closed-center system is allowed to enter the pump motor, speeding it up.

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andy

05-27-2004 21:45:00

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Re: Re: 706 hydraulics running a sprayer pump? Val in reply to Bob, 05-27-2004 20:46:29

Yes ... this pump has a screw (needle valve type thing) near the inlet hose on the pump. So, depending on what pump I have I can maybe screw it out and bypass some oil thereby allowing the lever to stay ON. I think though a parts man at a sprayer supply company told me that mine was for a hydraulic system other than the 706. Thanks

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Bob

05-27-2004 22:17:17

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Re: Re: Re: 706 hydraulics running a sprayer pump? in reply to andy, 05-27-2004 21:45:00

If the motor on your pump is for a closed-center system, open the adjustment screw on the pump motor wide open, and install a suitable valve between the pressure and return lines to bypass oil, and use this extra valve to control pump speed.

This will minimise heating of your hydraulic oil.

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