Rato R80, Maintenance Manual, Page: 66 / 79

Part IV Disassembly and Maintenance
62
Standard Service limit
See Tab. 1-3 See Tab. 1-3
b) The clearance between piston pin hole and piston pin
Use the inside micrometer and the outside micrometer to measure the inner diameter of the
piston pin seat hole and the outer diameter of the piston pin respectively. And then calculate
its clearance value based on measured result.
Standard Service limit
See Tab. 1-3 See Tab. 1-3
c) Piston-cylinder clearance
The difference between the maximum diameter of the cylinder and the diameter of the piston
skirt is the piston-cylinder clearance.
This clearance must be inspected before and after repair.
During inspection, put the piston upside down in the cylinder, put a thickness gauge with
appropriate thickness between the pressure bearing surface of the piston skirt and the
cylinder wall, and then pull out the thickness gauge. If you feel some resistance, but you can