105614-3401 ZEXEL 9 420 615 196 BOSCH AUTOM. ADVANCE MECHANISM 9420615196 1056143401 16810z5568

Figure 1The next chart shows maximum acceptable voltage loss in the high current battery circuit feeding the starting motor. These values are maximums for machines of approximately 2000 SMH and up. Newer machines would be less than those shown.
Figure 2Voltages greater than those shown are most often caused by loose and/or corroded connections or defective switch contacts.Diagnosis Procedure
Do not operate the starting motor for more than 30 seconds at a time. After 30 seconds, the cranking must be stopped for two minutes to allow the starting motor to cool. This will prevent damage to the starting motor due to excessive heat buildup.
If the starting motor cranks real slow or does not crank at all, do the following procedure:1. Measure battery voltage at the battery posts with the multimeter while cranking or attempting to crank the engine. Make sure to measure the battery posts. Do not measure the cable post clamps.2. Is battery voltage equal to or greater than shown in Figure 1? a. If the battery voltage is OK, go to Step 3.b. If the battery voltage is too low, test the battery as shown in Special Instruction Form No. SEHS7633. A low battery can be caused by battery condition or a shorted starting motor.3. Measure current draw on the (+) battery cable between the battery and the starting motor solenoid with the clamp-on ammeter. The maximum current draw allowed is shown in Specifications under Load Test. The figures shown in Specifications are taken at temperature of 27°C (80°F). At temperatures below 27°C (80°F), the voltage will be less and the current draw will be higher. If current draw is too much, the starting motor has a problem and must be removed for repair or replacement. If voltage at the battery post is within approximately 2 volts of the lowest value in the applicable temperature range of Figure 1 and if the large starting motor cables get hot, then the starting motor has a problem and the 8T0900 Ammeter test is not needed.4. Measure starting motor voltage from test point (4) to (5) with the multimeter while cranking or attempting to crank the engine.5. Is voltage equal to or greater than shown in Figure 1? a. If the starting motor voltage is OK, the battery and starting motor cables down to the motor are within specifications. Go to Step 8.b. If the starting motor voltage is low, the voltage drop between the battery and the starting motor is too great. Go to Step 6.6. Measure the voltage drops in the cranking circuits with the multimeter. Compare the results with maximum voltage drops allowed in Figure 2.7. Are all the voltages within specifications? a. If the voltage drops are OK, go to Step 8, to check the engine.b. If the voltage drops are too high, repair and/or replace the faulty electrical component.8. Rotate the crankshaft by hand to make sure it is not locked up. Check oil viscosity and any external loads that would affect engine rotation.9. Is the