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Jeff(WC)(MI) 
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Joined: 12 Sep 2009
Location: S.E. Michigan
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 Topic: wd45 hyd pump
Posted: 21 Aug 2010 at 1:49pm |
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when i have my plow hooked to the tractor and it's in the up position and tractor is idling and clutch is out..i hear a knocking or tapping in the trans...i was told it's the pump bypassing...if i clutch the tractor or idle up a little it goes away...is this normal or a problem? hydraulics seem to work good and normal
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Jeff(WC)(MI)
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Joined: 12 Sep 2009
Location: S.E. Michigan
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Posted: 21 Aug 2010 at 1:49pm |
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oh and i did drain the hydraulics when i got it and fill back up with 20w non detergent
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CTuckerNWIL
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Location: NW Illinois
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Posted: 21 Aug 2010 at 1:52pm |
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That's pretty normal. I don't know if it is the pistons in the pump knocking or if it is the unloader spool hammering, but is nothing to worry about.
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Jeff(WC)(MI)
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Posted: 21 Aug 2010 at 2:00pm |
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ok just curious...never had a tractor do that before...sure can make a feller nervous to start hearing that!
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Steve M C/IL
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Posted: 21 Aug 2010 at 2:32pm |
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Normal.I grew up with it so I never knew the difference.
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Max(ia)
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Joined: 15 Sep 2009
Location: Polk County,Ia
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Posted: 21 Aug 2010 at 4:05pm |
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My CA does that, but if I put the lever in hold position after the blade is raised, it stops
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Jeff(WC)(MI)
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Posted: 21 Aug 2010 at 4:24pm |
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ok thanks guys...eased my mind
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CJohnS MI
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Joined: 27 Jun 2010
Location: Lapeer MI
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Posted: 21 Aug 2010 at 5:17pm |
 Jeff(WC)(MI) wrote:
ok thanks guys...eased my mind |
Jeff... ... does this mean you found the source of the original "noise"?
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Roddo
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Posted: 21 Aug 2010 at 8:27pm |
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That is some primitive hydraulics by todays standards. Its likely just not sealing somewhere and running ever so slightly to keep pressure. Mine does the same thing.
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Jeff(WC)(MI)
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Posted: 21 Aug 2010 at 8:55pm |
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nope John, this is all together different, maybe the original noise is like you said about your cat, all my bad deeds coming back and making me paranoid?!
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CJohnS MI
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Posted: 21 Aug 2010 at 9:12pm |
Jeff(WC)(MI) wrote:
nope John, this is all together different, maybe the original noise is like you said about your cat, all my bad deeds coming back and making me paranoid?! |
Well, I can't speak for you - but my cat deserves it!
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Brian G. NY
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Posted: 21 Aug 2010 at 9:35pm |
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I think Max nailed it; if the lever is not moved back to the hold position after the rams reach their maximum lift, the hydraulic system is recycling oil thru the unloader valve and will sometimes make that kind of a sound. I have one WD-45 that "knocks" like that much more than either my other WD-45 or the WD, but they all do it to some extent.
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