2004 3520 Sight Glass Installation

[Zork]

Does anyone know what size sight glass we have and whether it is threaded or pressed in. Mine might be leaking and I would like a spare or two before I touch it.

I tried measuring it today at 1.173", but I couldn't get real close to say it was accurate. The screw in versions are about $10 for three units. This type has no hex head and is flush with the axle.

Thanks for any replies.

 

[Asteral]

if i remember correctly these 20 series sight glass are a press in type, you have to remove the outer rear cover for the pto shaft to replace this

 

[Zork]

if i remember correctly these 20 series sight glass are a press in type, you have to remove the outer rear cover for the pto shaft to replace this

Thanks, I need to check the torque on those bolts as well, I forgot the pto cover was bolted on. Anyway, there seems to be more paint delamination under the glass that leads me to believe the glass is the source. But, the quick connect coupler is directly above it and it isn't fully dry, so maybe I'll start there. Thanks again.