The recommended grease for chain lubrication is Castrolease Medium.The chain should have 1/2″ of movement on top run when correctly adjusted.
It is worth noting that the main gearbox should use a straight gear oil not EP90. Castrol D or equivalent SAE140 gear oil is recommended. I use Morris oils AG140 Classic Gear Oil. Castrol XL SAE 30 for the engine, Morris Oils Golden Film SAE30 Classic motor oil is what I use.
If you drop me an email with your email address I can send you a copy of the machine manual.