Help With Makita / Dolmar Oil Pump Rebuild

I am rebuilding the oil pump on my "new" Home Depot Makita. I just received the oil pump rebuild kit from Edge & Engine (Great Service!) and it included two adjusters - one black and one white. Is there a difference? I could not really see any difference but I have not "Miked" them out either. The tit on the end seems to be the same height and the notches on the adjuster appear to be the same depth. I can understand where the kit may include two of the adjusters - one to install and one back-up, but why a black and a white one?

The pictures show the two new adjusters and the original:

I have no idea but I'd like to know too.

PM Kyle and post his answer here, if he doesn't see this thread first.

tdi-rick said:

I have no idea but I'd like to know too.

PM Kyle and post his answer here, if he doesn't see this thread first.

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Not to sound too ignorant but which Kyle?

Kyle from Edge and Engine http://www.arboristsite.com/members/edge-and-engine.htm

Good bloke.

CuttinScott or 166 would know too, but you didn't buy it from them

Maybe I'll just give him a call in the a.m.

Any other Dolmar/Makita folks seen this before??

I talked with Kyle (very helpful, by the way!) yesterday. He took the time to "mike" each one and could find no difference. His suggestion was to just use the same color as the part removed from the saw. In my case it was the white one.

Before I put the saw back together I may just try them both to see if there is any volume difference between the two.

K.C. said:

I talked with Kyle (very helpful, by the way!) yesterday. He took the time to mike each one and could find no difference. His suggestion was to just use the same color as the part removed from the saw. In my case it was the white one.

Before I put the saw back together I may just try them both to see if there is any volume difference between the two.

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If the black one does deliver more oil, many of us will be wanting it for longer bars

tdi-rick said:

If the black one does deliver more oil, many of us will be wanting it for longer bars

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I would definetly be interested in more oil

I won't have time to try them out until next week some time but I will for sure post my findings!

Looking at the pictures, did you notice the "mushroomed" tip on the original adjuster? The way this oiler works - I'm still learning here folks so humor me! - the tip rides on the end of the gear shaft, which is cut at an angle. The position of the adjuster tip will regulate the stroke length of the pump (gear shaft). There was another post which showed a metal pin or screw run into the top of the adjuster to prevent the 'shrooming. That would help, but if I'm correct the only way to increase the stroke/output would be to:
1) optimize the position of the tip for max travel of the gear shaft, or;
2) Increase the angle on the end of the gear shaft to get more travel out of it.

I was contemplating option 2 by either welding a "blob" on the gear shaft or using some JB Weld. Either way, the angled end of the shaft needs to be highly polished or else it it will just grind the tip off the adjuster :bang:

On the other hand.... I have to wonder about the effectiveness of "PORTING" the oil pump! Since the pump output is a function of stroke length and volume available increasing one or the other should increase the output. If my thoughts are correct, opening up the oil passages in the pump and maybe larger tubing sizes would increase the output. :msp_confused: :msp_unsure:

K.C. said:

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Well I received all my parts from E & E - Thanks again Kyle! - and had time this morning to play with the pump and the two adjuster screws.

My "testing" was far from scientific (i.e. all visual) but I completely assembled the pump with the black, then the white adjuster and compared both the travel of the pump shaft, the rotation angle maximums on the adjuster and the position of the "nub" that rides on the end of the oiler shaft at the adjuster rotation end points.

Everything was pretty much identical, and if anything I perceived just a minute amount more pump shaft travel when using the white adjuster.

I did not -and most likely won't - do an actual volume check since I just don't have the time for it right now and I can't really imagine there being any significant output difference between the two.

Maybe someone in engineering at Sachs/Dolmar would have the lowdown?

Anyway I hope to have the rebuilt pump and new clutch installed today to fire this thing up and put it to some wood!!

Stick one in their and see what happens!!!

Well I put it my saw together with the white adjuster, which was the color of the original. I also cleaned out all the internal pump passages and the two tubes (feed & discharge) as well as installed a new clutch assembly (spider, shoes, springs, drum & bearing).

I put on the 20" bar that came with the saw and went to try it out in some oak and eucalyptus. With the adjuster at max position this thing reall flings the oil! Once it was primed and running for minute or two when I held the tip close to a box and spun the chain, oil was literally dripping down from the box!

Of course this is only with a 20" bar, but given that amount of oil I doubt it would have any problem running a 32. I will probably be going with a 24 or 28" bar when I change it out.

Sorry to jump on an old thread but I just ordered one of these kits for my Makita DCS6401 . When replacing these 'screws' in th ebottom of the oil pump, how do you get them in? Is it the tip of the screw which makes the adjustment or is that notch supposed to be making the adjustment? I've tried pushing it in but it doesn't seem to seat as far as it should so I removed the clutch but cannot get the oil pump off to see if I'm missing anything. Any help would be greatly appreciated.