I have a 12 year old Ryobi RCS4450C which has stopped feeding chain oil.
It looks to me as though there might be some sort of pump on the
crankshaft behind the drive sprocket and the centrifugal clutch (I only
have a low-res exploded diagram, with parts labelled but no "key").
Before I do any more dismantling (it took a while to get this far) can
anyone confirm I am likely to be right? I'm assuming that most petrol
chainsaws have similar layouts.

TIA

On 01/26/2020 12:51 PM, newshound wrote:
I have a 12 year old Ryobi RCS4450C which has stopped feeding chain oil. It looks to me as though there might be some sort of pump on the crankshaft behind the drive sprocket and the centrifugal clutch (I only have a low-res exploded diagram, with parts labelled but no "key"). Before I do any more dismantling (it took a while to get this far) can anyone confirm I am likely to be right? I'm assuming that most petrol chainsaws have similar layouts.

TIA
I had some luck with image searches for 'chainsaw type Parts List'.
(yes, on the one here, the pump is behind the clutch, near the drive gear, but finding all the screws you'd have to loosen is a matter of luck without a proper diagram)

On 26/01/2020 11:51, newshound wrote:
Ryobi RCS4450C

Any useful info he
https://www.sparetoolparts.co.uk/ryo...SABEgJ2gfD_BwE

What I tend to do in such situations is just loosen them until you can see
or feel play on all of them. I have never dismantled a chainsaw, but other
mechanical bits and pieces like aerial rotators and old videos seem to have
similar issues with which screw is doing what!
Brian

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On 01/26/2020 12:51 PM, newshound wrote:
I have a 12 year old Ryobi RCS4450C which has stopped feeding chain oil.
It looks to me as though there might be some sort of pump on the
crankshaft behind the drive sprocket and the centrifugal clutch (I only
have a low-res exploded diagram, with parts labelled but no "key").
Before I do any more dismantling (it took a while to get this far) can
anyone confirm I am likely to be right? I'm assuming that most petrol
chainsaws have similar layouts.

TIA
I had some luck with image searches for 'chainsaw type Parts List'.
(yes, on the one here, the pump is behind the clutch, near the drive gear,
but finding all the screws you'd have to loosen is a matter of luck
without a proper diagram)

On 26/01/2020 12:13, ss wrote:
On 26/01/2020 11:51, newshound wrote:
Ryobi RCS4450C

Any useful info he
https://www.sparetoolparts.co.uk/ryo...SABEgJ2gfD_BwE


Yes, very helpful thanks. Same diagram as I have, but they have a
comprehensive parts list that links to the drawing, confirming the
location of the pump. And they claim to have all the spares.

On 26/01/2020 11:51, newshound wrote:
I have a 12 year old Ryobi RCS4450C which has stopped feeding chain oil.
It looks to me as though there might be some sort of pump on the
crankshaft behind the drive sprocket and the centrifugal clutch (I only
have a low-res exploded diagram, with parts labelled but no "key").
Before I do any more dismantling (it took a while to get this far) can
anyone confirm I am likely to be right? I'm assuming that most petrol
chainsaws have similar layouts.

TIA
You are right, yes.

--
€œIt is dangerous to be right in matters on which the established
authorities are wrong.€�

ۥ Voltaire, The Age of Louis XIV

On 26/01/2020 12:56, The Natural Philosopher wrote:
On 26/01/2020 11:51, newshound wrote:
I have a 12 year old Ryobi RCS4450C which has stopped feeding chain
oil. It looks to me as though there might be some sort of pump on the
crankshaft behind the drive sprocket and the centrifugal clutch (I
only have a low-res exploded diagram, with parts labelled but no
"key"). Before I do any more dismantling (it took a while to get this
far) can anyone confirm I am likely to be right? I'm assuming that
most petrol chainsaws have similar layouts.

TIA
You are right, yes.

Eventually got it out, plastic worm gear on crankshaft damaged, new one
ordered. Still got lots of loose and attached bits, plus numerous
screws. Reassembling is going to be fun!

On Sunday, 26 January 2020 11:51:20 UTC, newshound wrote:
I have a 12 year old Ryobi RCS4450C which has stopped feeding chain oil.
It looks to me as though there might be some sort of pump on the
crankshaft behind the drive sprocket and the centrifugal clutch (I only
have a low-res exploded diagram, with parts labelled but no "key").
Before I do any more dismantling (it took a while to get this far) can
anyone confirm I am likely to be right? I'm assuming that most petrol
chainsaws have similar layouts.

TIA

What usually happens is wood chips get in the tank and block/damage the pump.

On 27/01/2020 17:26, harry wrote:
On Sunday, 26 January 2020 11:51:20 UTC, newshound wrote:
I have a 12 year old Ryobi RCS4450C which has stopped feeding chain oil.
It looks to me as though there might be some sort of pump on the
crankshaft behind the drive sprocket and the centrifugal clutch (I only
have a low-res exploded diagram, with parts labelled but no "key").
Before I do any more dismantling (it took a while to get this far) can
anyone confirm I am likely to be right? I'm assuming that most petrol
chainsaws have similar layouts.

TIA

What usually happens is wood chips get in the tank and block/damage the pump.

Thanks. Pump seems to be OK as is the "in" pipe but I have yet to check
that the "out" pipe and nozzle is clear.