|
Post by Hoggwood on May 12, 2021 22:51:59 GMT -5
Hi folks,
I am looking for some help on a 240 oil pump. 1991 very low hours. I’ve tried everything. Impulse is strong. Diaphragm as new. It must have oiled well as evidenced by the accumulation on the saw. Pickup and output lines are sound. Duckbill in tank body new. Pintle is within spec at 5/8”. Check in pump body works but spring seems strong. Pintle doesn’t unseat check until it bottoms out. Ran external input/output lines but it will not move oil. Cap on or off. Primed pintle. Solvent soak pump body. I don’t have another in series to swap pump. Thought about trying to pull the barbed fitting on the output to get to the check, but don’t know how the fitting is (cast?) attached. Tried light oil, water, heavy weight oil. Going to try to a external pressurized bottle of oil and see if I can force it to prime.
I could rework the system to pressurize the tank off the impulse and output the pickup directly to the bar pad, but maybe I am missing something simple. Adding the saw to my collection, as it is a nice example. I would rather opt to getting it operating as intended.
Thanks for the help.
|
|
|
Post by edju1958 on May 13, 2021 7:16:57 GMT -5
Hi Corey,I'm wondering if the oil line may be plugged with old sludgy oil?Or at the pad?
|
|
|
Post by dpress on May 13, 2021 9:32:29 GMT -5
The barbs are just a push fit into the plastic body of the pump i believe - my inlet steel barb came out when I was trying to remove an old hard oil line! I think you are right to suspect the check valve - I had an awful job getting a 245 to oil recently, and that was an accumulation of something inside the plastic body stopping the valve from operating correctly. Slightly different pump I know, with the manual oiler addition, but the diaphragm etc is the same. When you say you ran external lines - is that with the pump removed? I have tested before with a clear line attached to the inlet barb with oil in it, on the dismantled pump body, and just using my finger to operate the diaphragm against the spring. You can then rotate the body so that the oil line is vertical, giving you atmospheric pressure on the oil, which may help to get it primed/moving.
Regards, Steve
|
|
|
Post by Hoggwood on May 14, 2021 0:18:39 GMT -5
Hi Corey,I'm wondering if the oil line may be plugged with old sludgy oil?Or at the pad? Lines are clean and pressure tested. I did swap out the impulse line, as the transition from the inner spring to the fitting seemed narrow at the bend.
|
|
|
Post by Hoggwood on May 14, 2021 0:50:53 GMT -5
The barbs are just a push fit into the plastic body of the pump i believe - my inlet steel barb came out when I was trying to remove an old hard oil line! I think you are right to suspect the check valve - I had an awful job getting a 245 to oil recently, and that was an accumulation of something inside the plastic body stopping the valve from operating correctly. Slightly different pump I know, with the manual oiler addition, but the diaphragm etc is the same. When you say you ran external lines - is that with the pump removed? I have tested before with a clear line attached to the inlet barb with oil in it, on the dismantled pump body, and just using my finger to operate the diaphragm against the spring. You can then rotate the body so that the oil line is vertical, giving you atmospheric pressure on the oil, which may help to get it primed/moving. Regards, Steve I did try to actuate the pintle manually with the pump off the saw. It is either pulling and pushing and can’t overcome the check. Or the check is leaking. This was when the pump was oriented to draw oil from a reservoir below. I didn’t try to gravity feed the pump. Either way, I can get the check to operate with mouth pressure/vacuum at the output barb. Albeit, it is fairly strong. I am wondering if perhaps the bar oil actually needs to be more viscous as to less.
|
|
|
Post by edju1958 on May 14, 2021 7:38:32 GMT -5
Try using a light oil like a 5-15 winter engine oil.Sometimes the bars oil is just too heavy for the diaphragm pump to handle.When I get a stubborn pump like that I'll put clear kerosene in it,it's very light & has cleaning capabilities too.
|
|