Gravely Sprayer Question

1119 Views 2 Replies 3 Participants Last post by Richard-tx, Jan 3, 2012

allfoden

Discussion Starter · Jan 2, 2012

I have a tank sprayer for my Gravely. It had a Hypro piston pump that sort of worked but leaked and was totally rusted. So I bought a new Hypro pump to replace it. I replaced the lines and added a Hypro pulse damper (precharged to 800 psi)on the output. The new pump is rated 500 psi and 2gpm. The pump will quickly pump up to 500 psi and when I pull the spray trigger I get a great spay pattern but the pressure immediately falls to zero. I thought I might have received a bad pump so I borrowed another and installed it with the same result. I am at wits end to know what is going on. Would appreciate comments. Thanks

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CADplans

· #2 · Jan 2, 2012

Too large of an orifice at the wand end.

Smaller hole, less flow, higher pressure.

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Richard-tx

· #3 · Jan 3, 2012

Smaller tip means it will spray farther too.

There is difference netween pressure and volume of a pump. Pump manufacturers give two ratings. One is max flow (usually at 0 psi) and the other is max pressure at 0 flow (gpm). Finding a nice balance is tough.

Code:

                              [U]Current Inventory[/U]
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit [url]http://GTCOA.com[/url]

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