Section 1.
Introduction and Specifications
l-l. INTRODUCTION
This manual covers operation, scheduled maintenance
troubleshooting and corrective maintenance for Kohler gen-
erator sets designed and built for recreational vehicles. The
six standard models are the 3.5CM21 -RV, 4.5CM21-RV,
4.5CKM21 -RV, 5.5CM21 -RV, 7CM21 -RV and 7.5C21 -RV.
These models are referred to by their kilowatt output,
3.5kW, 4.5kW (single), 4.5kW (twin), 5.5kW, 7kW and
7.5kW. Differences between models are noted throughout
the manual. All models feature Kohler designed and built
4-cycle gasoline engines, rotating field generators and relay
controllers. See Table l-l for specifications and model vari-
ations, Table 1-2 for dimensions and weight, and Table l-3
for engine specifications. Refer to the wiring diagrams in
the back of the manual.
I-2. MODEL 3.5CM21-RV
The 3500 watt generator set is powered by a single
cylinder model K181 QS engine. The set produces 120 volt,
29 amp alternating current. It has a rotor with two
magnetic poles and operates at 3600 R.P.M., producing 60
hertz or 3000 R.P.M., producing 50 hertz, 13 amp current.
A 30 amp circuit breaker protects the set from overload
damage. Due to its compact size and lightweight, it is
installed in RV’s with limited suspension support and
compartment space. See Figure l-l for major components.
1-3. MODEL 4.5CM21-RV
The 4500 watt generator set is powered by a single
cylinder Kohler Model K341QS engine. The set produces
Model
3.5CM21-RV
3.5CM61-RV
3.5CFM21-RV
3.5CFM61-RV
4.5CM21:RV
4.5CM61 -RV
4.5CFM21-RV
4.5CFM61-RV
4.5CKM21 -RV
4.5CKM61 -RV
5.5CM21
5.5CM61
5.5CFM21
5.5CFM61
7CM21
7CM61
7.5C21
7.5C61
Volts
Amps Per
Term in al Watts Freq. (HZ) RPM
120
29
3500 60 3600
120/240
14.5 3500 60
3600
120
26.6
3200 50
3000
120/240
13.3
3200
50
3000
120
37.5 4500 60
1800
120/240 18.8
4500 60 *
1800
120
30
3600 50 1500
120/240
15
3600
SO
1500
120 37.5 4500 60
1800
1201240
18.8
4500 60
1800
120
46
5500 60
1800
120/246 23 5500 . 60 1800
120 37.5 4500 50 1500
120/240
18.8 4500 ,50 1500
120 58
7000 60 1800
120/240 26
7000
60 ’ 1800
120
62.5
7500
60 1.800
120/240
31.3 7500
60 1800
120 volt, 37.5 amp alternating current. It has a rotor with
four magnetic poles and operates at 1800 R.P.M., produc-
ing 60 hertz. A 40 amp line circuit breaker protects
generator against damage due to overload. See Figure l-2
for major components.
1-4. MODEL 4.5CKM21-RV
The 4500 watt generator set is powered by a two cylinder
Kohler Model KT17 engine. The set produces 120 volts,
37.5 amp alternating current. It has a rotor with four mag-
netic poles and operates at 1800 R.P.M., producing 60
hertz. Two 20 amp circuit breakers protect against damage
due to overload. See Figure l-3 for major components.
1-5. MODEL 5.5CM21-RV
The 5500 watt generator set is powered by a two cylinder
Kohler Model K582QS engine. The set produces 120 volt,
46 amp alternating current. It has a rotor with four magne-
tic poles and operates at 1800 R.P.M., producing 60 hertz.
A 50 amp circuit breaker (on most models) protects against
damage due to overload. See Figure I-4for major compon-
ents.
1-6. MODEL 7CM21-RV
The 7000 watt generator set is powdered by a two cylinder
Kohler Model K582QS engine. The’set produces 120 volt,
58 amp alternating current. It has a rotor with four magne-
tic poles and operates at 1800 R.P.M., producing 60 hertz.
A 60amp circuit breaker (on most models) protects against
damage due to overload. See Figure I-4for major compon-
ents.
. .
Wires, I
2
3
‘2
3
2
3
2
3
2
3
2
3
2
3
2
3
2
3
Phase
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Table l-l. Generator Specifications
l-l
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