Slide the armature out of the machine taking care not to damage any coils or coil connections. Remove the screws holding the fan to the fan hub on the armature and take off the fan. To thoroughly clean 211 the field coils it is often necessary, especially on the smaller machines, to disconnect the field coil connections and take out the field coils and pole pieces. Care should be exer- cised during assembly to replace the windings exactly as they were before disassembly. See the section on "Maintenance" for complete details on cleaning, servicing, and replacement of parts for the machine. ASSEMBLY Reverse the preceding procedure, taking care not to damage the windings or the commutator surface, and being sure that all machine surfaces are clean so that all the parts will fit together properly. All electrical connections should be checked for good contact, and proper clearance established between live parts and ground, and between terminals of opposite polarity. 3-59