Hitachi WR22SA Handling Instructions - Page 7

English 2. Extension bar The extension bar is convenient for working in very restricted spaces or when the socket provided cannot reach the bolt to be tightened. CAUTION When the extension bar is used the tightening torque is reduced slightly compared with the ordinary socket. So it is necessary to operate the tool a little longer to get the same torque. 3. Universal joint The universal joint is convenient for impacting nuts when there is an angle between the socket and wrench, or when working in a very narrow space. Optional accessories are subject to change without notice. APPLICATIONS ⅜ Tightening and loosening various kinds of bolt and nut. PRIOR TO OPERATION 1. Power source Ensure that the power source to be utilized conforms to the power requirements specified on the product nameplate. 2. Power switch Ensure that the power switch is in the OFF position. If the plug is connected to a receptacle while the power switch is in the ON position, the power tool will start operating immediately, which could cause a serious accident. 3. Extension cord When the work area is removed from the power source, use an extension cord of sufficient thickness an rated capacity. The extension cord should be kept as short as practicable. 4. Fixing the side handle The position of the side handle attached to the hammer case can be changed by unscrewing the handle. (Right hand screw) Turn the handle to the desired position for the job and secure the handle by screwing up tight. 5. Mounting the socket (1) Pin, O-ring type (Fig. 1) Select a socket matched to the bolt to be tightened or loosened. Insert the socket on the anvil of the wrench, and secure it with the pin and ring. When dismantling the socket, reverse the sequence. (2) Plunger type (Fig. 2) Align the plunger located in the square part of the anvil with the hole in the hex socket. Then push the plunger, and mount the hex socket on the anvil. Check that the plunger is fully engaged in the hole. When removing the socket, reverse the sequence. HOW TO USE 1. Operation of switch (Fig. 3) The switch in this machine functions as a motor switch and rotational direction selector switch. When the switch is set to R indicated on the handle cover, the motor rotates clockwise to tighten the bolt. When the switch is set to L, the motor rotates counterclockwise to loosen the bolt. When the switch is released, the motor stops. CAUTION Be sure to turn the switch OFF and wait until the motor completely stops before changing the direction of wrench revolution. Switching while the motor is rotating will result in burning the motor. 2. Tightening and loosening bolts A hex socket matching the bolt or nut must first be selected. Then mount the socket on the anvil, and grip the nut to be tightened with the hex socket. Holding the wrench in line with the bolt, press the power switch to impact the nut for several seconds. If the nut is only loosely fitted to the bolt, the bolt may turn with the nut, therefore preventing proper tightening. In this case, stop impact on the nut and hold the bolt head with a wrench before restarting impact, or manually tighten the bolt and nut to prevent them slipping. OPERATIONAL CAUTIONS 1. Confirm the line voltage (Fig. 4) The available tightening torque is influenced by line voltage. Reduced line voltage lowers the available tightening torque. For example, if you use a 220 V type wrench on a 200 V line the available tightening torque will be reduced to 70 to 90 %. When extending the power cord, use an extension cord which is as short as possible. When the line voltage is low and a long extension cord is needed a step up transfomer should be used. The relation between the line voltage and the tightening torque are shown in the figures. 2. Do not touch the bumper or hammer case during continuous operation The bumper and hammer case become hot during continuous screw tightening so be careful not to touch them at that time. 3. Work at a tightening torque suitable for the bolt under impact The optimum tightening torque for nuts and bolts differs with material and size of the nuts and bolts. An excessively large tightening torque for a small bolt may strech or break the bolt. The tightening torque increases proportionally to the operating time. Use the correct operating time for the bolt. 4. Selecting the socket to be matched to the bolt Be sure to use a socket which is matched to the bolt to be tightened. Using an improper socket will result not only in insufficient tightening but also in damage to the socket or nut. A worn or deformed hex or square-holed socket will not give an adequate tightness for fitting to the nut or anvil, consequently resulting in loss of tightening torque. Pay attention to wear of socket holes, and replace 6