This is Chapter 3 of the four part video series covering FPG8601 Maintenance activities.
Cleaning the FPG8601 piston-cylinder requires a skill set similar to cleaning of other large diameter piston cylinders, such as the ones used with the PG7601. The unique double ended construction and large size of the FPG's piston-cylinder makes the cleaning task unique.
The method shown is not the required method, rather a recommendation. For those with experience cleaning other piston-cylinders, then it's recommended to stick with the methods which have produced good results. A clean piston-cylinder is the goal, how one gets there is a secondary consideration.