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How To Repair Oil Pump On A Stihl Farm Boss 290

Topic: stihl ms290 oil pump works great, but oil doesn't get to the chain  (Read 34571 times)

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I've read a thread similar to this problem, but I think mine is unique.  With no bar and chain on, oil flows freely from the port.  The hole in the bar is unobstructed.  The saw is very make clean.  With the bar and chain on, oil does not achieve the chain, the chain and bar become so hot you tin can't touch it.  The chain is not too tight.

Is there supposed to exist a gasket or seal between the saw and the bar that would strength the oil to go through the hole in the bar to the concatenation instead of pooling under the cover?  It doesn't thing if the bar is in regular or upsidedown.  All I become is pooling.

I am positive that the oil pump is working equally I have information technology turned upwards all the way and I can see it flowing freely from the port.  Whatever ideas???  Cheers in advance, Steve


Wrong bar, holes don't match ?

1995 Wood Mizer LT forty, Liquid cooled kawasaki,homebuilt hydraulics. Homebuilt solar dry kiln.  Woodmaster 718 planner, Kubota M4700 with homemade forks and winch, stihl  028, 029, Ms390
100k bd ft society.Charter member of The Grumpy erstwhile Men


Wrong bar, holes don't lucifer ?

Sounds like it to me..  what kind of saw and what brand of bar is on information technology??

Andy

Stihl 009, 028, 038, 041, MS362
Mac 1-40, 3-25


Is the oil hole make clean? mine seems to become blocked up all the time and will prevent oil menses

LT10G10, Stihl 038 Magnum, many woodworking tools. Currently a farm service applicator, trying to find time to saw!


The holes friction match perfectly.  the hole is make clean.  I've even taken a compressor and blown air through it to make sure.  When the bar is off of the saw, and I place the concatenation in the groove of the bar, I tin can meet very clearly through the hole that the bottom tab of the concatenation that would selection up the oil if available passes past the hole idicating that the pigsty is indeed open.  It is a Stihl ms290 saw with the original stihl bar.  I've used the saw without a problem for nigh 5 years.  This problem started happening a few uses agone and I'm smoking blades left and right.


When the saw is running WITHOUT the bar on - is the oil flowing out as in running out.. or is it squirting out getting oil all over everything??

Starting to sound like your oil pump isn't pumping with total pressure to get information technology onto the bar.

With the bar off, try placing your finger over the outlet hole while it's running - see if you tin can concord the oil in.  If you lot can, your pump may be getting weak or at that place may exist something broken inside it.

Andy

Stihl 009, 028, 038, 041, MS362
Mac 1-twoscore, 3-25


That sounds like an oil pump to me, besides. If the bar/chain are installed, with the saw running if the pump is operating, oil should catamenia. A mode to meet is concord the bar tip a few inches away from whatever apartment surface. Run the saw as normal and detect if whatsoever oil is leaving the tip and collecting on the surface when the chain is spinning. If not, with all the holes cleaned and unobstructed, I would think it's a bad pump or gear.

Many Stihl Saws-xvi"-60"
"Get Inquire The Other Principal Chief"
xviii-Wheeler Commuter for J&R Schugel


The 029-039 uses a little wire contraption that aligns with a notch in the clutch drum to rotate the pump gear .At present if for whatever reason that thing jumps out of that notch it doesn't pump so expert .In addition also the worm gear which is fabricated of plastic sometimes looses part of information technology's teeth .It might even exist the screw portion of the pump that holds the wire could exist stripped .

Piece of cake enough to check out ,just pull the clutch drum and there information technology all is .To get to the actual pump you accept to spin off the clutch merely yous should be able to heart ball information technology without removal .That'southward not a big bargain either,block the piston and spiral it off ,left hand threads .


If the chain is 2 loose the drivers volition literally wing past the oil being pumped.Effigy this out.When yous accelerate, the clutch pulls the chain tight on the bottom of the bar. Now if the chain is loose the chain coming off the clutch sprocket will literally overpass the oil. The oil has to go someplace and so now information technology drips out of the bottom of the saw.Wrong  gauge chain may also be a contributing factor, Ken

Stihl The One
Stihl Going Stiff
Stihl Looking For The Fountain of Heart Age


Is the grove in your bar make clean?

 It may expect clean only could be as well total for the chain to get the oil, if yous dont have a grove cleaning tool use something thin enough to pull through the grove both sides of the bar.


Thanks again for the posts.  THe concatenation is non too loose.  The groves on the bar are squeaky clean.  I blow it out with a compressor when I clean it.  The oil FLOWS out when the bar and chain are not installed and the engine is running.  It does not Eject.  I will endeavour to occlude the hole and see if I can contain the oil.  THis sounds like the about plausable problem.  Thanks again for the suggestions.


Steve, you said oil gets pumped out of the outlet without the bar but itdoes not come onto the concatenation , and it pools. By pooling if yous mean than oil is flowing down the rear of the bar, here are a few possibilities:
# The groove on your bar is worn out to a point that the oil escapes along the side of the drive links.The result is oil is not pushed forrad.
# Similarly, the aforementioned matter could also happen if your saw concatenation's drive links are worn as well much.
(These ii causes volition cause backlog lateral movement of the concatenation when it is fitted on the bar.)

# The bar mount area on the ability head or mating area of the guide bar are uneven.
(Use some thick but soft paper to brand a gasket to get a proper seat)

# If yours is a Stihl guide bar, just within the groove, next to the hole for the oil to come in, there is a sort of well, which is a separate clip similar piece.If by run a risk, during cleaning yous happen to loose this piece the oil wont catamenia forward.Check if its nevertheless in place past moving a small screwdriver or such through the groove. When you reach the oil hole, the screwdriver should take a slight dip when it moves into the well.If it does not practice that, y'all are missing that well. Just at that place is a well on the other side of the guidebar too. Bank check if at least yous have that i. If not yous need to replace the bar.

Joe


Joe
You sure exercise offering adept communication on our Stihl saws. And with adept clarity on the explanation too.
Overnice to have your input and expertise on the Forestry Forum.

southward cardinal Wisconsin
 It may be that my sole purpose in life is but to serve equally a warning to others


Joe
Y'all sure do offer good communication on our Stihl saws. And with good clarity on the explanation too.
Nice to take your input and expertise on the Forestry Forum.

Give thanks you .
I would be only be too glad to know that my suggestions were useful hither.

Joe


Joe
You sure practice offer good advice on our Stihl saws. And with good clarity on the caption too.
Nice to take your input and expertise on the Forestry Forum.

Make that X2
FB

I never met a tree I didn't like!!


Steve

Did you ever ready your saw? If so, what was the problem? My 290 is having the same problem as yours. The bar is so hot a drop of water will boil after only a few cuts. I put in a new oiler, cleaned lines, filter, groves, new chain, turned oiler on high, only information technology still gets hot!! I emailed Stihl and that was a waste of fourth dimension.


The 290 won't spew oil - if the oiler is working, if you fire the saw up and hold information technology over a piece of paper-thin and tweak the throttle a couple times, you'll encounter a fine line of oil hit the cardboard nearly the tip of the bar, simply that's all the Eastward-matic system puts out.

If y'all got that much oil, the oiler's working and the issue is something else.

Olfactory organ sprocket need cleaning, something bent on the concatenation or in the bar?   Some actress friction somewhere.... boring concatenation?

Senior Member?  That'due south funny.


Stephen,

Did you ever figure this out??  I recently developed the aforementioned problem with an MS250.  I take the B/C off and I can see oil peridically spurting out of the oiler, but I'm non using hardly any oil.  When I put the B/C back on I'm not getting any oil off the tip of the B/C.  I have cleaned the bar groove, oil port on the bar, and the oiler port on the saw with compressed air.


Diggin' upwards basic here, but idea I would give my 2 cents.  I just tore 2 MS250'south down to the creepo case and swapped motors and all associated parts into new crankcases (clamshells).  I traced the oiling problem back to the clamshell beingness melted out by the oiler gear.  There must exist some aqueduct in in that location that was damaged causing the oil to fall out the lesser of the saw and not reach the chain.  While looking for crank cases I talked to a local stihl mechanic that stated this was caused by turning up the idle and then leaving the chain brake on.  After running my other 250 that had a tree dropped on information technology, just was like new and this 1 after rebuilding both the original ane pictured below has quite a loftier idle.  Anyways here is a pic.


I felt like a retard, only my final oiling effect on my 039 was resolved by simply immigration the oil vent with some compressed air.

Smarter guys (hither) than me aimed me at that place.





How To Repair Oil Pump On A Stihl Farm Boss 290,

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