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Old 07-13-2014, 03:35 PM
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americanlawn americanlawn is offline
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Hypro D-50 pressure too high

I think it's in the control unit, but not sure.

I just installed a brand new D-50. Works fine EXCEPT .... the pressure is very high. Even with the control level completely off (not used).

I need to run very low pressure for Roundup jobs. I spose I can get by with partially closing the valve, but something is wrong.

D-50, D-30 -- probably doesn't matter. NOTE: I used the old control unit from my previous Hypro D-50.

Anybody help is appreciated. Thanks
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Old 07-13-2014, 03:57 PM
bug-guy bug-guy is offline
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check that the shaft in the control unit is not frozen shut. it should bob up and down when the trigger is released
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Old 07-13-2014, 07:01 PM
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Quote:
Originally Posted by americanlawn View Post
I think it's in the control unit, but not sure.

I just installed a brand new D-50. Works fine EXCEPT .... the pressure is very high. Even with the control level completely off (not used).

I need to run very low pressure for Roundup jobs. I spose I can get by with partially closing the valve, but something is wrong.

D-50, D-30 -- probably doesn't matter. NOTE: I used the old control unit from my previous Hypro D-50.

Anybody help is appreciated. Thanks


Yes a D 50 at 14 GPM is an excellent choice for spraying Roundup. Only a wise man would fool with any thing smaller??


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Old 07-14-2014, 03:19 PM
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RigglePLC RigglePLC is offline
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I suspect you are right, Larry. Control unit is probably not working--froze-up, jammed or something. Take it apart. Replace it with a top-quality Spraying Systems pressure relief valve. No plastic, no aluminum--brass and stainless steel valve seats.
Naturally cut your engine rpms back to a low level.

I know of a case where the guys in a similar situation in the spring could not get their lawn spray truck down to a reasonable pressure level. Yikes--it hit a thousand pounds when they were showing it to us. 10 hp motor.
Turned out, the return line was blocked by last year's Barricade wp residue.
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Old 07-14-2014, 08:14 PM
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americanlawn americanlawn is offline
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Installed a new control unit this morning. Works fine now. Hypro control units do NOT last as long as the pump(s) for sure. Got a lot of 'dead Indians' laying around in the warehouse. LOL There is a kit for rebuilding them, but I've never had good luck -- neither have the folks at http://www.sprayers.com. Pump rebuilds = no prob >> control units = a real b$tch. LOL
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