Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Dolmar Makita => Topic started by: Ducksnuff870 on March 02, 2014, 08:31:58 am

Title: 7300 oiler
Post by: Ducksnuff870 on March 02, 2014, 08:31:58 am
I generally run a 24" bar on my 7300. I'm only using a half of a tank of bar oil to a tank of gas. As far as I know we have the oiler turned up all the way. I'm not burning the bar and chain up but it seems like a lil more bar oil wouldn't hurt. How much bar oil are the rest of the dolmars out there using? My 036 uses almost a full tank of bar oil to a tank of fuel.
Title: Re: 7300 oiler
Post by: 660magnum on March 02, 2014, 09:42:32 am
It is likely time to rebuild your pump? The adjuster part of your pump is made of nylon. The end of the adjusting screw wears off with use and your oil pump volume diminishes.

When you get the O-rings and the adjuster, there is a black adjuster (5200/5105/520) and a white one (6400/7300/7900) .  I replace the rubber hoses or tubes too while I'm in there. If you do not have a green suction hose, it is time to change out the hoses.

Something else I've noticed about older saws of this series is that someone has stripped the adjust where it will turn around and around. The adjustment range is less than one quarter turn.

http://chainsawrepair.createaforum.com/dolmar/7300-oiler/

Oiler hole in bar?

http://chainsawrepair.createaforum.com/dolmar/modding-an-oiler/
Title: Re: 7300 oiler
Post by: aclarke on March 02, 2014, 12:10:22 pm
check the oil tank vent too...
Title: Re: 7300 oiler
Post by: 660magnum on March 02, 2014, 12:16:33 pm
One thing about this series of saws (6400, 7300, & 7900) is that they are not known to be prolific oilers.

Some rules of thumb are to not use greater than a 28" bar because of the oiler if you are cutting blow downs and dry wood off the ground....

If clean green standing wood, you can sometimes get by with a 32" bar.

A 7900 has good enough power for a 32" bar but the oiler is the limiter.

With the 7300/7900, most I've seen had a 24" bar.
Title: Re: 7300 oiler
Post by: 7sleeper on March 02, 2014, 04:45:05 pm
Are you sure it is turned up all the way? Sounds a little like turned down to minimum.

7
Title: Re: 7300 oiler
Post by: 660magnum on March 02, 2014, 04:51:36 pm
To adjust the oiler . . .

Right for reduced oil supply
Left for more oil supply

There's only 70 degrees of travel between low and high!
Title: Re: 7300 oiler
Post by: 660magnum on March 02, 2014, 04:56:02 pm
Something not mentioned in this thread is that the newer Oregon EPA bars have a tiny angled oil hole in each side of the bar that is only like 1/16" diameter.

I drill these out to 5/32".

Make sure the grooves and oil holes are free of wood chips
Title: Re: 7300 oiler
Post by: Ducksnuff870 on March 02, 2014, 05:00:15 pm
I'll double check the setting. I have a new stihl sprocket nose 25" bar mounted on it. I've never given any thought to the oil holes. would smaller holes keep the saw from putting out as much oil?
Title: Re: 7300 oiler
Post by: 660magnum on March 02, 2014, 05:02:19 pm
Yes, but I don't remember Sthl ES branded bars having small oiler holes? Maybe mine are not new enough?
Title: Re: 7300 oiler
Post by: aclarke on March 02, 2014, 09:00:27 pm
Large mount stihl bar with adapter?
Title: Re: 7300 oiler
Post by: Ducksnuff870 on March 03, 2014, 07:59:29 am
Large mount stihl bar with adapter?
yes
Title: Re: 7300 oiler
Post by: 660magnum on March 03, 2014, 08:02:45 am
Did you check that the oiler hole in the bar aligned with the oiler hole in the Dolmar?
Title: Re: 7300 oiler
Post by: fordfairlane78 on March 04, 2014, 03:32:21 am
I have a very low hr 6400 & recently sold a home depot 6401, both on max oiling used as stated 1/2 tank oil to 1 tank of gas. After finding out that these oilers were not the best I just assumed this was normal.  Is anybody getting more out of there 6400-7900?
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 07:52:13 am
I'm not
Title: Re: 7300 oiler
Post by: Ducksnuff870 on March 04, 2014, 09:16:43 am
I have a very low hr 6400 & recently sold a home depot 6401, both on max oiling used as stated 1/2 tank oil to 1 tank of gas. After finding out that these oilers were not the best I just assumed this was normal.  Is anybody getting more out of there 6400-7900?
Thats kinda what I was wondering myself?
Did you check that the oiler hole in the bar aligned with the oiler hole in the Dolmar?
actually no but I've beem running it and haven't had any problems but seems a lil more would not hurt.
Yes, but I don't remember Sthl ES branded bars having small oiler holes? Maybe mine are not new enough?
Its a slanted hole in my new Stihl ES bar. A 3/32 drill bit fits the hole. I'll post pics later today.

Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 09:18:54 am
That's a EPA oil hole in the bar.
Title: Re: 7300 oiler
Post by: Ducksnuff870 on March 04, 2014, 09:26:51 am
i figured. i ran an old stihl 16" bar yesterday with big oil holes. It used the same ammount of oil.
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 09:41:45 am
Good point
Title: Re: 7300 oiler
Post by: KilliansRedLeo on March 04, 2014, 09:46:10 am
I have a 7900 that I tried to run a 28" GB titainium bar on, and had to go back to a 24 or less, just wasn't getting enough oil. I wonder if the pump out of a 9000 would work on the 7900 and pump more oil? I have a Solo 694 which I think is actually a 9000 it oils like jack the bear.
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 09:52:30 am
Look at the IPL's? Most of those Dolmars had the same basic oiler with only slight variation of the inlet and outlets.
Title: Re: 7300 oiler
Post by: KilliansRedLeo on March 04, 2014, 09:58:44 am
Thanks, Jim, I'll dig up the IPLs and report back.
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 10:29:02 am
Write down the repair kit numbers and compare them?   I know the 5105 and 7900 have the same kit for the pump itself but the kit comes with two different adjusting screws. A white one for the big saws and a black one for the little saws. Even compare back with the 111/115 & 6000/6800?

I've tried to compare the black and white screws and the difference is not obvious?
Title: Re: 7300 oiler
Post by: aclarke on March 04, 2014, 12:50:17 pm
Few Aussie guys on AS say they use big bars no problem and oil usage is 1 to 1.   Any alternate p/n for overseas saws?
Title: Re: 7300 oiler
Post by: aclarke on March 04, 2014, 01:07:39 pm
Pn 038 245 010 replaced by 011 pump.  Anyone know the changes made to the New pump?
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 02:38:01 pm
The rebuild kit for the two different numbers is the same.

They probably added a extra barb on the hose connection for the newer 7910  (011) pump?

I bet if you order the old number it will supersede to the new 011 number?
Title: Re: 7300 oiler
Post by: aclarke on March 04, 2014, 03:20:19 pm
Yep, superseded by the 11.  Sounds like the internals are the same, maybe just the hose barb as you mentioned.  Perhaps the intake tube is shrinking/collapsing where the pump presses onto it?   since the O.D of the intake tube is supported by the relief machined into the case, the tube would want to collapse in on its I.d when the pump is screwed down???
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 03:35:40 pm
I have a few Dolmars and the oiler is rather juicy with leaks on some of them. None are prolific oilers on the chain.

I was given a 111i all original and the 15" X .058" bar and .325 X .050 chain was the oilingest thing on the chain you ever seen. I changed the chainsaw around with a 115 closed port cylinder, a new Power Match 3/8" X .050 X 16" X 60DL bar and Stihl RS chain as well as a new 115 two shoe clutch with a wrap spring. I drilled the oil holes out to 5/32" in the Oregon bar. It is now just a regular oiler on the chain and messes up the shelf when you store it. I've never rebuilt the pump.
Title: Re: 7300 oiler
Post by: KilliansRedLeo on March 04, 2014, 03:42:44 pm
I started digging around and I actually have a new 9000 pump. I'll pull the clutch on my 7900 and see if they even look the same. I ordered this and a repair kit over a year ago to repair a Makita version of the 9000. I remember that the new pump did not look like the pump on the 9000, so I just used the kit and rebuilt the original pump.
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 03:55:06 pm
The 372 clutch removal tool works perfect on the 7900
Title: Re: 7300 oiler
Post by: Ducksnuff870 on March 04, 2014, 04:35:06 pm
Look at the IPL's? Most of those Dolmars had the same basic oiler with only slight variation of the inlet and outlets.
I'm not sure what an IPL is.I normally don't dig to deep into saws if they need much work. Farthest I've ever been into one is when I installed a new cylinder and piston on my 036. I've never touched an oiler.

My 7300 has been used to pull a 36" bar once. My friend borrowed the saw and bar to cut up a big stump. He said he kept an oil can close by to keep oil on the chain. The guy I bought the bar from ran it on a 7900. A friend of mine has a ported 7900 we pulled a 36" bar with it on a big maple. He said the oiler did fine.
Title: Re: 7300 oiler
Post by: KilliansRedLeo on March 04, 2014, 05:03:32 pm
Seems like the saws are inconsistent in how they oil. Thanks for the tip in the 372 clutch tool Jim, did not know that!
Title: Re: 7300 oiler
Post by: 660magnum on March 04, 2014, 05:20:16 pm
Look at the IPL's? Most of those Dolmars had the same basic oiler with only slight variation of the inlet and outlets.
I'm not sure what an IPL is.I normally don't dig to deep into saws if they need much work. Farthest I've ever been into one is when I installed a new cylinder and piston on my 036. I've never touched an oiler.

My 7300 has been used to pull a 36" bar once. My friend borrowed the saw and bar to cut up a big stump. He said he kept an oil can close by to keep oil on the chain. The guy I bought the bar from ran it on a 7900. A friend of mine has a ported 7900 we pulled a 36" bar with it on a big maple. He said the oiler did fine.
On clean green wood, a 7900 can run the big bars fine.