OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers Rebuild 45

Now this is where the fun begins....

I refitted the drum sprocket and the differential would not engage. ie: I'd rotate the sprocket in the forward direction and it would simply spin without driving the drum. BUGGER! It's only supposed to rotate free in the reverse direction.

Thinking cap on.....I had the whole lot stripped down last week and greased up the diff lock pins. I realised then that they are not supposed to be greased as the grease holds them in place so they can't drop under gravity and engage the drum.

SO.....after assembling everything perfect as above, I had to strip everything down again. Most annoying! But that's one lesson learned!!

There are 3 locking pins on each side which drive the left and right drums together, but they allow one drum to rotate slower around corners or free rotate backwards. The pointy end of those pins normally fall under gravity and grab one of those 6 locking tabs on that red hub. But the grease was holding them in towards the centre and they weren't engaging.



Who the hell put all that grease in there!!



Bit of dry graphite powder to the rescue! All degreased and ready to assemble....AGAIN!







Once the drums are together, these locking collars hold them together on the drive shaft. It's easiest to mount the drums by sliding them DOWN onto the VERTICAL shaft, so the pins stay in place.