Table  of  Contents 
Page 
Safety  Precautions  . . . . . . . . . . . . . . . . . . . . . . . 
i 
Section  1.  Introduction  and  Specifications 
l-l. 
l-2. 
l-3. 
l-4. 
l-5. 
1-6. 
l-7. 
1-8. 
1-9. 
Introduction 
.............................  l-l 
Model  3.5  CM21-RV 
......................  l-l 
Model  4.5  CM21-RV  (single) 
..............  l-l 
Model  4.5CKM21-RV  (twin) 
...............  1-I 
Model  5.5  CM21-RV 
...................... 
l-l 
Model  7  CM21-RV 
........................  l-l 
Model  7.5  C21-RV 
........................ 
1-2 
Oil  Specifications 
........................  l-4 
Fuel  Specifications 
....................... 
l-5 
Section  2.  Operation 
2-1.  General. 
.........................  2-1 
2-2.  Prestart  Checklist 
...................  2-1 
2-3. 
Operation 
........................  2-l 
Section  3.  Scheduled  Maintenance 
Governor 
3-1. 
General. 
.........................  3-1 
3-2. 
Scheduled  Maintenance 
...............  3-I 
Section  4.  Troubleshooting 
4-l.  General. 
........................  .4-l 
4-2. 
RV  Systems  Check 
..................  4-1 
4-3.  Troubleshooting 
....................  4-2 
Section  5.  Relay  Controller 
5-l. 
5-2. 
5-3. 
5-4. 
5-5. 
Description 
.......................  5-1 
Sequence  of  Operation 
...............  5-l 
Fuses 
...........................  5-4 
REl  Diode 
.......................  5-5 
Relays 
..........................  5-5 
Page 
Section  6.  Generator 
6-l.  General 
.......................... 
6-1 
6-2.  Troubleshooting  ....................  6-1 
6-3.  Generator  Disassembly  ...............  6-l 
6-4.  Build-up  Circuit 
....................  6-7 
6-5.  Brushes  ..........................  6-8 
6-6.  Slip  Rings 
........................  6-9 
6-7.  Exciter  /  Voltage  Regulator  ............  6-9 
6-8.  Stator  ..........................  6-I  1 
6-9.  Rotor.  .........................  6-11 
6-10.  Separate  Field  Excitation  .............  6-11 
6-11.  Voltage  Sensing  Relay  ...............  6-12 
6-l  2.  Generator  Reassembly  ...............  6-12 
Section  7.  Choke,  Shutdown  Control  and 
7-1. 
7-2. 
7-3. 
7-4. 
7-5. 
7-6 
7-7. 
7-8. 
7-9. 
Choke  Testing  and  Adjustments 
(3.5kW,4.5kW).  . . . . . . . . . . . . . . . . . . .  7-1 
Choke  Testing  and  Adjustments 
(4.5  twin,  5.5,7,  7.5kW)  . . . . . . . . . . . . .  7-3 
Positive  Shutdown  Control  (3.5kW-7kW)  . . . .  7-3 
Crankcase  Breather  (3.5kW,  4.5kW)  . . . . . . .  7-4 
Governor  (3.5kW,  4.5kW  single).  . . . . . . . . .  7-4 
Governor  Hunting  Checks  (4.5kW  Only)  . . . .  7-5 
Governor  (4.5kW  twin).  . . . . . . . . . . . . . . .  7-6 
Governor  (5.5kW,  7kW)  . . . . . . . . . . . . . . .  7-6 
Governor  (7.5kW)  . . . . . . . . . . . . . . . . . . .  7-7 
Section  8.  Wiring  Diagrams 
Appendix 
Radio  Frequency  Interference  Kit..  . . . . . . . . A-l