- 14 -When the balance is lost, the hammer knife will vibrate because it is rotating at highspeed, which is very dangerous. Exercise care sufficiently.10. Hammer knife10-1. Use of both sides of hammer knifeBoth sides of the hammer knife are sharpened. When one side is worn, remove thepair of knives, and attach them reversely. The knife is attached to the knife shaftmounting hitch section by 11 mounting pin 32 and the nut with disc washer, and theknife can be removed easily.Attach the mounting pin in the same direction as before.The tightening torque of the knife mounting bolt is 32-36 N.m (almost the same asordinary M10 bolts).The knife shaft assy is balanced when shipped from our factory; therefore, unlessall the knife blades of the same weight each are replaced at one time, or unlessreplaced symmetrically on the right and left portions of the knife shaft, the weightbalance may be lost and vibration may be generated.Since the hammer knife shaft assy are rotated at high speed, pay attention to theweight balance when replacing the hammer knife.10-2. Replacement of hammer knifeWhen both sides of the hammer knife blade are worn, grind each blade in a mannerthat the weight of each blade will be the same as much as possible.When the weight balance of the hammer knife shaft assy including the knife blades ispoor, the hammer knife shaft assy will generate vibration, breaking the machine.10-3. Grinding the hammer knife- -12Wear protective goggles and gloves when grinding the hammer knife.CAUTIONCAUTIONC A U T I O NC A U T I O NThe step is kept horizontal at all times by the angle sensor, automatic levelcontrol box and electric cylinder. The "step control changeover switch" atop theelectrical equipment box permits switching from AUTO to MANUAL, and viceversa. When the step control changeover switch is in the "MANUAL" position,the "step control manual switch" on the control panel permits control.9-6. Step (simple riding unit)9-7. Transportation on public roadsFor transporting this machine through public roads, follow the appropriate laws ofthe country where it is moved.9-8. Alarm buzzerWhen the alarm buzzer sounds, the engine is overheated. Stop operation, andremove dust that is jamming in the radiator or air cleaner etc.When the machine is not to be moved, pull the side brake lever fully to your side,and the brake will be applied to the hydraulic motor and the traveling lever will belocked at the neutral position.9-9. Side brakeCAUTIONCAUTIONImpact to the step will impose a burden on the supporting point, causing failure.Exercise care so as not to strike the step against any object when moving themachine backward or turning the machine.CAUTIONHowever, be sure to set the step control changeover switch in the "AUTO"position during mowing. Use the manual position only when maintaining themachine, the automatic control circuit fails, or some other emergency arises.When the automatic circuit fails, replace the part with a new one immediately. Donot operate the machine for mowing on the manual control step.CAUTION