Willis WMI12MH16S Service Manual page 114

Steps
1. Remove top cover and handle
1 Before disassembly.
Twist off the screws used for fi xing the handle, pull
2
the handle upward to remove it.Loosen the screws
fixing the valve cover and then remove the valve
cover.
3 Twist off the screws used for fi xing the top cover, pull
the top cover upward to remove it.
Procedure
handle
valve cover
top cover