134. Clean off any foreign particles on the clamping surfaces of both collarsand on the mounting surface of the blade.4. Position the blade beneath the cutting head and slide the blade into theblade guard (slide the blade under the blade guard at an angle will simplifythe installation process). Be careful not to hit the blade shaft with theblade.5. Locate the blade shaft then slide the blade bore hole onto the blade shaft.Use only Norton Diamond Blades. This machine was not designed forthe use with abrasive blades. For the best performance when cuttinggreen concrete use the Norton GMAX series blade.6. Slide the outside blade shaft collar onto the blade shaft.7. Tighten the blade shaft nut (Turn counter-clockwise) securely against theoutside collar. Close the blade nut access door.8. Reconnect the spark plug (GC55 models only).Use Only Norton Diamond BladesB. Starting the Engine GC551. Refer to the engine owner's manual for the proper starting procedures.2. Always cut with engine rpm in the full throttle setting.C. Operating the Saw1. For blade installation instructions see section II. Operation sub headingA. Installing the Blade. For the engine starting instructions (GC55), seethe Engine manual and follow the instructions located in section II.Operation sub heading B. Starting the Engine and for ElectricalConnections (GC25E) see section E. Electrical Connections GC25E2. Check the Engine Oil level (GC55 only).3. Raise the saw to the full upright position. Do not let the blade come incontact with the ground.4. Maneuver the saw to the desired starting point.