The manual specifies “TAMOIL TAMLITH GREASE 2”
This is a Lithium soap based grease with a temperature range of -30 to 130 C.
Castrol L/EPO is a suitable substitute (or equivalent in other brands).
It’s a Lithium based semi fluid grease suited to gearboxes and being semi liquid is self-levelling.
post hole digger with the handles above waist level
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Stop the engine nd allow it to cool before making adjustments or completing any maintenance.