Makita UC3520A / UC4020A Questions

John Q.6y · UC3520A

I have this chainsaw for five years going good does the job now leaking oil from the bottom any suggestion what do .?

dennis11y · UC4020A

has lost oil feed , how do I fix it?

AYam 11y

Mate, I'd start by cleaning the oil outlet. It tends to get really dirty in there.

dennis 11y

I dismantled the whole unit in the end . All the cover screws ,trigger ,large drive gear ,cleaned oil tank /feed line /oil pump plastic feed housing / put all back together / used 5w 30 synthetic oil all fixed works well .The chain bar lube recommend can thicken up some times / best to flush as per manual.

Dan Johnson 10y

If yours is not lubricating, here's a fix: take the bar and chain off and slightly loosen the oil reservoir cap. Then run the machine like that until you see oil pumping from the reservoir nipple. The without cleaning off the emergent oil, reattach the bar and chain and run it over a surface until you can see oil spraying on the surface.

dennis 10y

all done and fixed dismantled the entire unit cleaned it won't use the recommended oil ever again too sticky now use 5w synthetic oil dash of white spirits

small dash only at end of use for a small flush wont hurt