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best speedometer calibration tool
For the best speedometer calibration tool: A gear adapter is produced. With the gear adapter, all speedometer gears can be interchanged. The shaft hole in the adapter is eccentric. Any one of the three sets of drive gears can be installed to ensure the required transmission ratio. The calibration of the speedometer is carried out by mechanical means, that is, the balance spring is used to balance the torque of the magnet so that the calibration can be carried out at least at three points of the dial. The test bench of the speedometer requires that the tachometer be rotated at the specified speed. This should be carried out according to the operating instructions provided by the speedometer manufacturer.
Operate the speedometer on the test bench and pay attention to the noise. The noise shall be lower than the required standard.The test time should be such that the speedometer runs to a number that records several miles. All digital wheels except for a few rotating ones shall be arranged symmetrically. A relatively simple method is to wait for the pointer to stop when it is above zero to see if it is aligned. If there is too much grease on the meter, wipe it off. The flexible shaft and the cover should also be wiped clean. Some speedometer shafts are equipped with lubricating felt or felt lines. Modern speedometer generally does not need lubrication.When lubricating the flexible shaft of the speedometer, only add a little special lubricating oil, and too much lubricating oil will flow from the flexible shaft to the head of the speedometer. The accuracy of speedometer the accuracy of speedometer and odometer is related to tire size, rear axle pinion ratio and the gear driving the speedometer. Changing the tire size and adopting different rear axle speed ratio will change the accuracy of speedometer and odometer. In order to ensure high accuracy, automobile manufacturers have equipped the speedometer with drive gears of different specifications.
The first step required to detect the fault of the speed control system is to visually observe and check the following items:
(1)Check whether all visible parts of the system are abnormal, whether the wires are peeled off and whether the vacuum hose is damaged.
(2) The speedometer cord must also be properly placed and must not be excessively bent or twisted together.
(3) Servo mechanism (i.e. throttle actuator) and pull rod shall work smoothly;
(4) The idle stroke of the chain shall not be greater than 1 / 4 inch;
(5) The electrical connector must be complete and firm;
(6) The wire harness must be neat. Check whether there is insulation peeling and whether the connector is loose or short circuited; The above necessary corrections shall be made before proceeding with other inspections.
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