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5 shires

CS-2511 issue?

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You called....feeling like a bloody genie!!!!

Pump shafts typically run in an alloy housing or in a metal insert pushed in to a plastic or metal body. Sometimes after many years use, the metal, especially in the alloy ones, gets a bit worn so the oil isn't pressurized through the pump properly and can end up pissing out between the shaft and housing out where the pinion fits - it happens and can severely reduce oiling pressure - seen it on old 020Ts a fair bit.

The pump typically gets plugged with wood chip as the filter tends to be pretty course, pick up pipes or filters can get blocked and also bar holes can be blocked - seen it all before.

I usually just strip the pump out, check for plugging, check the pinion, check the pickup parts and flush the tank. That fixes most issues apart from excessively worn pumps.

 

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1 hour ago, spudulike said:

You called....feeling like a bloody genie!!!!

Pump shafts typically run in an alloy housing or in a metal insert pushed in to a plastic or metal body. Sometimes after many years use, the metal, especially in the alloy ones, gets a bit worn so the oil isn't pressurized through the pump properly and can end up pissing out between the shaft and housing out where the pinion fits - it happens and can severely reduce oiling pressure - seen it on old 020Ts a fair bit.

The pump typically gets plugged with wood chip as the filter tends to be pretty course, pick up pipes or filters can get blocked and also bar holes can be blocked - seen it all before.

I usually just strip the pump out, check for plugging, check the pinion, check the pickup parts and flush the tank. That fixes most issues apart from excessively worn pumps.

 

Your a magician not as well as a genie...thanks spud and do you agree with takeing the gauze covering from over the oil filter to allowe more oil through on the 2511 to stop the chain tightening up or is this a no no? Promise not to rub the lamp again👍

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I haven't really had a look at the oil strainer on these machines as I haven't had one in with issues.

Technically, the strainer is there to stop dirt blocking the pump. 

Taking out a strainer may work for a while but it will allow the pump to become blocked.

I would look at seeing if the Stihl or Husqvarna strainer may fit and work better. 

I wouldn't recommend removing the strainer on any saw as it is likely to cause further issues in time.

 

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On 17/09/2020 at 08:03, spudulike said:

I haven't really had a look at the oil strainer on these machines as I haven't had one in with issues.

Technically, the strainer is there to stop dirt blocking the pump. 

Taking out a strainer may work for a while but it will allow the pump to become blocked.

I would look at seeing if the Stihl or Husqvarna strainer may fit and work better. 

I wouldn't recommend removing the strainer on any saw as it is likely to cause further issues in time.

 

Hi spud and sorry for late reply to your last post and just to say thank you for information given and I will be trying to see if the oil strainer from a stihl will fit over this weekend have just been to busy to do anything all week and I will obviously post on here if it works and thanks again for your help👍

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On 16/09/2020 at 09:50, Ty Korrigan said:

 

Do oil pumps actually wear out?

   Stuart

Oil Pumps are quite simple mechanisms - assuming there is an oil film between the plunger and cylinder bore there is virtually no direct metal-to-metal friction.

Reality is different though - sometimes these cavities get dry(er) and metal friction happens which leads to gradual (or immediate) wear.

Typically oilers are damaged because abrasive dirt particles get from the tank through the strainer into the pump or the strainer simply gets clogged by dirt or bio-oil wax.

This is the reason why manufacturers kindly ask to maintain regular oil tank and oil strainer cleanups and not leaving bio oil there for too long.

 

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