peter.cutting
New member
I have a McCulloch Pro Mac II (46cc) which has been running nicely with original 18 inch bar and .325 chain . I have used it to mill some 14 inch logs, but now I have a larger log and the bar is too short. So my (slightly crazy) plan is to put a 25 inch bar on it and angle grind off half the teeth. It will be very slow but hopefully not overload the engine
so a 25 inch bar means 3/8 chain and a new drive sprocket. I thought I purchased everything right but when I tighten the chain it binds.
If I pull the chain over just the bar cog then I would say that its a correct match. Therfore I suspect that the chain and drive sprocket are not matched. But Its difficult to confirm this. Or maybe its the bar and the chainsaw in some way
Here are the specs:-
stihl bar 63 cm 1,3 mm 3/8'' 84DL
https://www.maskinklippet.se/skog/motorsag-skarutrustning/sagsvard/stihl-svard-63-cm-13-mm-3-8-84dl
chain Stihl 3/8'' Rapid Micro (RM) 1,3 mm 84dl Sågkedja
https://www.maskinklippet.se/skog/m.../stihl-3-8-rapid-micro-rm-13-mm-84dl-sagkedja
sprocket (3/8", 6T)
https://www.dlastore.com/sprocket-clutch-drum-bearing-for-mcculloch-models-240260-538240260.html
I hope someone can see where I have gone wrong. Or suggest how I can troubleshoot the problem
Peter
PS some more info that is probably not relevant:-
the bar doesnt fit the saw well as the bar sausage hole is wider then the diameter of the 2 bolts. So the bar ends up pointing "up" a bit
The chain tightening hole on the bar is too far out, but I used a dremel to extend the hole towards the bar center line
the chain is on the long side. Maybe I can shorten it if and when I reach the stop
so a 25 inch bar means 3/8 chain and a new drive sprocket. I thought I purchased everything right but when I tighten the chain it binds.
If I pull the chain over just the bar cog then I would say that its a correct match. Therfore I suspect that the chain and drive sprocket are not matched. But Its difficult to confirm this. Or maybe its the bar and the chainsaw in some way
Here are the specs:-
stihl bar 63 cm 1,3 mm 3/8'' 84DL
https://www.maskinklippet.se/skog/motorsag-skarutrustning/sagsvard/stihl-svard-63-cm-13-mm-3-8-84dl
chain Stihl 3/8'' Rapid Micro (RM) 1,3 mm 84dl Sågkedja
https://www.maskinklippet.se/skog/m.../stihl-3-8-rapid-micro-rm-13-mm-84dl-sagkedja
sprocket (3/8", 6T)
https://www.dlastore.com/sprocket-clutch-drum-bearing-for-mcculloch-models-240260-538240260.html
I hope someone can see where I have gone wrong. Or suggest how I can troubleshoot the problem
Peter
PS some more info that is probably not relevant:-
the bar doesnt fit the saw well as the bar sausage hole is wider then the diameter of the 2 bolts. So the bar ends up pointing "up" a bit
The chain tightening hole on the bar is too far out, but I used a dremel to extend the hole towards the bar center line
the chain is on the long side. Maybe I can shorten it if and when I reach the stop