Hi besty, welcome to Outdoorking.
First, the cutter spindles do not have any provision for externally packing them, AFAIK. Pumping grease in would blow the seals out of the ends of the housings and would be a really bad idea. I do not know of a ride-on cutter spindle that is serviced other than by dismantling, cleaning, inspecting, and re-packing with the specified lubricant.
Second, you may not be aware that Rover and Victa did not make ride-on mowers, they bought American ones and re-badged them. Consequently all dimensions are imperial, not metric. You need a set of A/F (Across Flats) spanners to work on that mower.
