Dolmar 64xx/73xx/79xx series, smurfs and solo 665/675/681 thread

[CLEARCUT]

I have a 36 on the 7900, and am really happy with it. Absolutely loving the HD air filter system.

 

[CLEARCUT]

@HYPERSAWS trying out the 7900.

 

[huskyboy]

Ok so here’s a rough guideline how to rebuild your oil pump on the 7900 series saws... First you will need this kit. You will need a punch or the right size drill bit to tap out the roll pin. I ground this one down to fit. Next unscrew the white plug from the end of the pump and the guts will come out. Then tap out the roll pin with the pump secured in a vise. Then the adjustment screw can be removed. Notice the worn nub on the screw? That’s why this saw wasn’t oiling good anymore. There is a oring on the screw and spring. Put that oring and spring on the new screw. Align the screw properly in the pump, push on it and get the pin started in there. Make sure the screw is seated in properly before you drive in the pin. Reassemble the pump and prime it with oil by filling it and turning the drive wheel.

 

[RI Chevy]

Cool. You didn't file or grind down the pump pin to make it oil a bit more? Do the pump mod instead of pump rebuild?
How much are those kits?

 

[huskyboy]

Cool. You didn't file or grind down the pump pin to make it oil a bit more? Do the pump mod instead of pump rebuild?
How much are those kits?

No oiler mod needed with a 64cc. They will oil a 32” .063 bar ok with the 64cc cylinder. The 7900 is sort of stingy (not near as bad as 1128 series stihls though) with a long bar with the same pump because it has more chainspeed/more rpm in the cut = more friction. It also burns more fuel so the gas to oil usage is not 1/1 like the 64cc. Pump needed a rebuild because the plastic “nub” was worn out on the adjuster. Rebuild kit is cheap.

 

[huskyboy]

If one wants to increase oil output I already mentioned how I do it early on in this thread.

 

[RI Chevy]

Got it. TY

 

[CLEARCUT]

Any difference between the black and white adjuster? I can’t see a difference.

 

[huskihl]

Angular nipples are weird.
Just sayin'

Any difference between the black and white adjuster? I can’t see a difference.

White is the higher flow option. Both come with the rebuild kit

 

[huskyboy]

I noticed the white had more offset on the nub (hard to see) and probably equals higher flow like Kevin said.

 

[CLEARCUT]

Angular nipples are weird.
Just sayin'


White is the higher flow option. Both come with the rebuild kit

Copy. When I first looked at them, I didn’t see any real difference. I’ll have to look a little closer.

 

[huskihl]

Copy. When I first looked at them, I didn’t see any real difference. I’ll have to look a little closer.

At the angled nipples?



I saw that shìt right away

 

[CLEARCUT]

I noticed the white had more offset on the nub (hard to see) and probably equals higher flow like Kevin said.

I can see the difference now that I put them side by side.
I have a rebuild kit, but hopefully it doesn’t have to be rebuilt for awhile anyways.

 

[huskyboy]

I can see the difference now that I put them side by side.
I have a rebuild kit, but hopefully it doesn’t have to be rebuilt for awhile anyways.

It should last you a long time, this one was a higher hour 7300 chassis that was scored then a 64cc cylinder fitted.

 

[huskyboy]

Not just rebuilding the oiler. It’s getting new carb box, new fuel line/filter, kill switch and cleaned up a little. The front lower av mount was also replaced. Muffler is already gutted.

 

[huskyboy]

About to test it

 

[huskyboy]

Ok guys so the saw runs nicely, first time out it wouldn’t oil properly so I took the pump off and rebuilt a different spare one I had. Oils great now. Must’ve messed something up or the pump body was just bad. I did notice it’s crucial to line up the adjustment screw in the right position and push it in. This prevents damaging it when installing the roll pin.

 

[huskyboy]

Runs good enough for me.

 

[dahmer]

Runs good enough for me.

The flesh colored safety chaps were cool, they a special order?

 

[huskyboy]

The flesh colored safety chaps were cool, they a special order?

I don’t recommend doing what I do lol. I always wear some sort of ppe logging. Always wear steel/composite toe boots too. Not usually cutting cookies, I should. I just relaxed my standards.