105921-3510 ZEXEL 9 420 612 953 BOSCH GOVERNOR 9420612953 1059213510 1157704100

Table 1
Conversion Table    
Current    Hertz    RPM    
4.0     0     0    
4.5     159     38    
5.0     319     75    
5.5     478     113    
6.0     638     150    
6.5     797     188    
7.0     956     225    
7.5     1116     263    
8.0     1275     300    
8.5     1434     338    
9.0     1594     375    
9.5     1753     413    
10.0     1913     450    
10.5     2072     488    
11.0     2231     525    
11.5     2391     563    
12.0     2550     600    
12.5     2709     638    
13.0     2869     675    
13.5     3028     713    
14.0     3188     750    
14.5     3347     788    
15.0     3506     825    
15.5     3666     863    
16.0     3825     900    
16.5     3984     938    
17.0     4144     975    
17.5     4303     1013    
18.0     4463     1050    
18.5     4622     1088    
19.0     4781     1125    
19.5     4941     1163    
20.0     5100     1200    
Illustration 5 g00562935
Calibrate the transmitter.
Disconnect the wiring from the transmitter.
Ensure that the resistor is located on the input side of the transmitter. The resistor should be across the positive terminal and the negative terminal.
Connect an ammeter and a signal generator as you are shown in illustration 5.
Ensure that the signal generator is not generating a signal (zero Hertz).
Adjust the zero dial until the ammeter reads 4 mA.
Adjust the signal generator in order to produce an output of 5100 HZ.
Adjust the span dial until the ammeter reads 20 mA.
Adjust the signal generator in order to produce an output of zero hertz. Verify that the ammeter reads 4 mA.
The ammeter reads 4 mA. STOP.
The ammeter does not read 4 mA. Proceed to 3.
Readjust the frequency input.
Adjust the signal generator in order to produce zero Hertz.
Adjust the zero dial until the ammeter reads 4 mA.
Adjust the signal generator in order to produce an output of 5100 HZ.
Adjust the span dial until the ammeter reads 20 mA.
Adjust the signal generator in order to produce an output of zero hertz. Verify that the ammeter reads 4 mA.Note: Repeat the procedure in order to calibrate a frequency transmitter properly. Continue until both the 4 mA and the 20 mA readings are correct.
The ammeter reads 4 mA and 20 mA at the desired input frequency. STOP.
The ammeter does not read 4 mA and 20 mA. Replace the transmitter. Verify that this repair eliminates the problem.Magnetic Pickup Sensor
The magnetic pickup sensor sends the engine speed signal to the engine speed switch and to the transmitter.
Illustration 6 g00562936
Setting and Adjustment
Adjust the sensor's clearance from the flywheel.
The engine is secured. Install the sensor until the sensor contacts the flywheel.
Back off the sensor (1.2 0.1 turns).
Measure clearance between the flywheel and the