How to Correct Hitachi 70 Throttle Motor

Hitachi 70 throttle motor rotates counterclockwise according to the normal rotation direction of the engine. Remove the cover of the valve mechanism until the timing indicator and the scale on the pulley are aligned, and check whether the valves of cylinder 1 are all closed. If they are all closed, this position is the compression top dead center of 1 cylinder. Before checking or adjusting the valve clearance, tap the valve rocker arm with a soft hammer to ensure that the rod of the valve blind rod is close to the base circle of the camshaft.

The fault phenomenon of Hitachi 70 throttle motor has not been corrected.

The most easily damaged part of the Carter machine is the fault phenomenon of the throttle motor, such as the throttle can't be added, the throttle can't be closed or the fuel stroke is incorrect. Another problem with Hitachi is its slow speed and weakness. After inspection, the 10 ohm current limiting resistor on the side of the 27V voltage stabilizer was damaged, and it worked less than an hour after replacement. At this time, the crux of the fault is that the angle sensor on the hydraulic pump has been damaged and needs to be replaced.

Carter's machine is also easily damaged. The main problem caused by general pressure switch is the failure of automatic throttle. When the three pressure switches act, they are connected to Hitachi EX series machines through multimeter measurement. The common fault of PVC board is that it moves slowly, and Hitachi EX can't turn it off. Basically, the line diode is damaged.