Operation Manual

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Fig.13A Fig.13B
10.2 CUTTING BLADE
CAUTION: Be sure to disconnect and ground the spark plug wire before working on the cutting blade to prevent accidental
engine starting. Protect hands by using heavy gloves or a rag to grasp the cutting blades .Tip the mower as specified in the
separate engine manual. Remove the hex bolt and washer which hold the blade and blade adapter to the engine crankshaft.
Remove the blade and adapter from the crankshaft.
WARNING: Periodically inspect the blade adapter for cracks, especially if you strike a foreign object. Replace when
necessary.
For best results your blade should be sharp. The blade may be resharpened by removing it and either grinding or filing the cutting
edge keeping as close to the original bevel as possible. It is extremely important that each cutting edge receives an equal amount
of grinding to prevent an unbalanced blade. Improper blade balance will result in excessive vibration causing eventual damage to
the engine and mower. Be sure to carefully balance the blade after sharpening. The blade can be tested for balance by balancing
it on a round shaft screwdriver. Remove metal from the heavy side until it balances evenly.
Before reassembling the blade and the blade adapter to the unit, lubricate the engine crankshaft and the inner surface of the
blade adapter with light oil. Insert the key into the blade adapter and Install the blade adapter on the engine crankshaft, push the
washer into the blade adapter and install the blade, Refer to figure 14. Place the blade with the part number facing away from the
adapter. Align the washer over the blade and insert the hex bolt. Tighten the hex bolt to the torque listed below:
Fig. 14
10.3 BLADE MOUNTING TORQUE
Center Bolt 40Nm-50Nm, to insure safe operation of your unit. ALL nuts and bolts must be checked periodically for correct
tightness.
After prolonged use, especially in sandy soil conditions, the blade will become worn and lose some of its original shape. Cutting
efficiency will be reduced and the blade should be replaced. Replace with an approved factory replacement blade only. Possible
damage resulting from blade unbalance condition is not the responsibility of the manufacturer.
When you change the blade only use the original type marked on the blade (Cobra Part 263002488) -to order a blade, contact
your local dealer.
10.4 ENGINE
Refer to the separate engine manual for engine maintenance instructions.
Maintain engine oil as instructed in the separate engine manual packed with your unit. Read and follow instructions carefully.