Kohler PRO 12.3 EFI Owner's Manual

34 590 01 Rev. A

KohlerPower.com

EN

PRO 12.3 EFI
Generator Owner's Manual

IMPORTANT: Read all safety precautions and instructions carefully before

operating equipment.

Ensure generator is stopped and level before performing any

maintenance or service.

Record product information to reference when ordering parts or obtaining warranty coverage.

Specication

Serial Number
Purchase Date

ESS

FRC

2 34 590 01 Rev. AKohlerPower.com

CAUTION

Electrical Shock
can cause injury.

Do not touch
wires while
generator is
running.

Never operate generator in
rain or snow.

Never touch generator
with wet hands or electrical
shock may occur.

WARNING

Rotating Parts
can cause
severe injury.

Stay away while
generator is in
operation.

Keep hands, feet, hair,
and clothing away from all
moving parts to prevent
injury. Never operate
generator with covers,
shrouds, or guards
removed.

WARNING

Accidental
Starts can cause
severe injury or
death.

Disconnect and
ground spark
plug lead(s)
before servicing.

Before working on
generator or equipment,
disable engine as follows:

1) Disconnect spark plug
lead(s). 2) Disconnect
negative (–) battery cable
from battery.

Do not allow children to
operate generator.

WARNING

High Pressure
Fluids can
puncture skin
and cause
severe injury or
death.

Do not work
on fuel system
without proper
training or safety
equipment.

Fluid puncture injuries are
highly toxic and hazardous.
If an injury occurs, seek
immediate medical
attention.

WARNING

Hazardous
Voltage.

Backfeed to
utility system
can cause
property
damage, severe
injury, or death.

Never plug a portable
generator directly into a
building outlet.

If generator is used for
standby power, have a

certied, licensed electrician

install an automatic
transfer switch to prevent
inadvertent interconnection
of standby and normal
sources of supply.

WARNING

Explosive Fuel

can cause res

and severe
burns.

Do not ll fuel

tank while
generator is hot
or running.

Gasoline is extremely

ammable and its vapors

can explode if ignited.
Never refuel while smoking
or in vicinity of an open

ame. Store gasoline only

in approved containers, in
well ventilated, unoccupied
buildings, away from sparks

or ames. Spilled fuel

could ignite if it comes in
contact with hot parts or
sparks from ignition. Never
use gasoline as a cleaning
agent.

WARNING

Hot Parts can
cause severe
burns.

Do not touch
generator while
operating or just
after stopping.

Never operate generator
with heat shields or guards
removed. Do not modify
generator.

Place generator in a place
where pedestrians or
children are not likely to
touch generator.

Be sure to carry generator
only by its carrying handles.

Safety Precautions

DANGER: A hazard that will result in death, serious injury, or substantial property damage.

WARNING: A hazard that could result in death, serious injury, or substantial property damage.

CAUTION: A hazard that could result in minor personal injury or property damage.

NOTE: is used to notify people of important installation, operation, or maintenance information.
Read this manual carefully before operating this machine. This manual should stay with this

machine if it is sold.

3

34 590 01 Rev. A

KohlerPower.com

EN

California Proposition 65 Warning

Engine exhaust from this product contains chemicals known
to State of California to cause cancer, birth defects, or other
reproductive harm.

Important Labels on Generator

WARNING / ADVERTENCIA / AVERTISSEMENT

● Hot parts can cause severe burns. / Las piezas calientes pueden causar quemaduras graves. / Les pièces chaudes peuvent causer de graves brûlures.

● Do not touch generator while operating or just after stopping. / No toque el generador durante el funcionamiento o inmediatamente después de pararse. / Ne touchez pas le générateur pendant qu'il tourne ou si

vous venez tout juste de l'arrêter.

● Explosive Fuel can cause fires and severe burns. / La explosión del carburante puede provocar incendios y quemaduras graves. / Carburant explosif pouvant causer des incendies et des brûlures graves.

● Do not fill fuel tank while generator is hot or running. / No llene el tanque de combustible mientras el generador esté caliente o funcionando. / N'ajoutez pas de carburant si le moteur est chaud ou s'il tourne.

● Electrical shock can cause injury. / Las descargas eléctricas pueden provocar lesiones. / Les chocs électriques peuvent causer des blessures.

● Do not touch wires while generator is running. / No toque los cables con el generador en funcionamient. / Ne touchez pas aux le générateur pendant que le moteur tourne.

● Do not connect generator to a building's electrical system unless using an isolation (transfer) switch installed by a certified, licensed electrician. / No conecte el generador al sistema eléctrico de un edificio a menos

que use un aislamiento (transferencia) interruptor instalado por un electricista certificado y certificado. / Ne branchez pas le générateur dans le système électrique d’un bâtiment sauf si un commutateur-converteur
a été installé par un électricien agréé et compétent.

California Proposition 65 Warning

This product contains chemicals known to State of California
to cause cancer, birth defects, or other reproductive harm.

4 34 590 01 Rev. AKohlerPower.com

W

Z

AG

AF

AE

AD

AB

AC

AA

V

U

C

B

F

T

Y

S

L

M N

R

Q

P

AH

AH

X

A

K

D

H

I

F

O

J

E

G

A Hour Meter B MODYS C Pilot Light D MIL Light

E Circuit Breaker F Circuit Protector G

GFCI

Receptacle

H

12V DC

Receptacle

I Ground Terminal J Fuse K Auto Idle L

240/120V/50A

Electrical Socket

M

240/120V/30A

Electrical Socket

N

120V/30A

Electrical Socket

O Fuel Tank Cap P Fuel Valve

Q Fuel Filter R Engine Fuses S Starter Battery T Dipstick

U Oil Drain Plug V Oil Filter W

Fuel Pump

Module

X Spark Plug

Y Oil Fill Cap Z Air Cleaner Base AA Paper Element AB Precleaner

AC Rubber Seal AD Element Cover AE Wing Nut AF Air Cleaner Knob

AG

Air Cleaner

Cover

AH

Unique EFI

Fuel Filter

AI

Wireless
Connect

AJ

Diagnostic

Button

AJ

AI

5

34 590 01 Rev. A

KohlerPower.com

EN

Pre-Start Checklist

1. Ensure generator is at least 3.3 ft. (1 m) from
building or other equipment and not covered
with any material.

2. Refer to all warning labels prior to starting.

3. Check oil level. Add oil if low. Do not overll.

4. Check fuel level. Add fuel if low. Stop
refueling when indicator reaches F (full)
level. Check fuel system components and
lines for leaks. Never refuel while unit is
running.

5. Check starter battery (S).

6. Ground generator.

7. Check that air cleaner components and all air
inlets are unobstructed, equipment covers,
and guards are in place and securely
fastened.

8. Ensure electrical devices (load) are not
connected to generator.

Starting

WARNING

Rotating Parts can cause severe
injury.

Stay away while generator is in
operation.

Keep hands, feet, hair, and clothing away
from all moving parts to prevent injury. Never
operate generator with covers, shrouds, or
guards removed.

NOTE: Auto Idle (K) switch must be in OFF

position when using electric devices
that require a large starting current,
such as a compressor or a submersible
pump. Auto Idle (K) controls engine
speed according to connected load.
Results are better fuel consumption
and less noise.

NOTE: MODYS (B) automatically performs 5

start-up attempts.

1. Turn main AC circuit breaker (E) OFF.

2. Turn fuel valve (P) ON.

3. Turn MODYS (B) key to ON position.

4. Press START button on MODYS (B).

5. Test GFCI receptacles (G).

Cold Weather Starting

1. Use proper oil for temperature expected.

2. Disengage all possible external loads.

3. Use fresh winter grade fuel. Winter grade
fuel has higher volatility to improve starting.

Operation

WARNING

Hazardous Voltage.
Backfeed to utility system can

cause property damage, severe
injury, or death.

Never plug a portable generator directly into
a building outlet.

If generator is used for standby power,

have a certied, licensed electrician install

an automatic transfer switch to prevent
inadvertent interconnection of standby and
normal sources of supply.

When running speed of generator has
stabilized (approximately 3 minutes):

1. Check that circuit breakers (E) are pushed in.
Press if necessary.

2. Connect appliances to be used to electrical
sockets (G, L, M and N) of generator.

3. Hour meter (A) shows number of hours that
generator has worked.

Angle of Operation
Do not operate this engine exceeding maximum

angle of operation; see specication table.
Engine damage could result from insufcient

lubrication.

6 34 590 01 Rev. AKohlerPower.com

Cable Selection

Generator

Socket Type

10 A 16 A 32 A

Recommended

Cable Cross

Section

mm

2

AWG

mm

2

AWG

mm

2

AWG

Length

of

Cable

Used

0 to

50 m

4 10 6 9 10 7

51 to

100 m

10 7 10 7 25 3

101 to

150 m

1

10 7 16 5 35 2

1

This cable length is maximum permitted

length, and must not be exceeded.
Installation method=cables on raceway

or non-drilled tablet/Permitted drop in
voltage=5%/Multi-core conductors/Cable
type PVC 70°C (e.g. H07RNF)/Ambient
temperature=86° F (30° C).

Maintenance Instructions

WARNING

Before working on generator or equipment,
disable engine as follows: 1) Disconnect spark
plug lead(s). 2) Disconnect negative (–) battery
cable from battery.

Do not allow children to operate generator.

Accidental Starts can cause
severe injury or death.

Disconnect and ground spark
plug lead(s) before servicing.

Safety is an obligation of owner. Periodic inspection, adjustment and lubrication will keep your

generator in safest and most efcient condition possible. Most important points of generator

inspection, adjustment, and lubrication are explained on following pages.

Maintenance Schedule

First 25 Hours or Annually

1

● Service/replace precleaner (if equipped).

Every 100 Hours or Annually

1

● Change oil.

● Replace air cleaner element (AA).

● Remove and clean shrouds and cooling areas.

Every 200 Hours

1

● Replace unique Electronic Fuel Injection (EFI) fuel lter.

Every 200 Hours or Annually

1

● Change oil and lter (V).

Every 500 Hours or Annually

1

● Replace spark plugs (X) and set gap.

1

Perform these procedures more frequently under severe, dusty, dirty conditions.

Auto Idle

NOTE: Auto Idle will only function when unit is
on 120V function.

ON Position. When Auto Idle (K) switch is
in ON position, Auto Idle (K) controls engine
speed according to connected load. Results are
better fuel consumption and less noise.

OFF Position. When Auto Idle (K) switch is in
OFF position, engine runs at rated rpm (3,600
rpm) regardless of whether there is a load
connected or not.

NOTE: Turn Auto Idle to OFF when unit is using

240V conguration.

Stopping

1. Disconnect electrical devices and allow

engine to run without any load for 1-2
minutes.

2. Turn MODYS (B) key to OFF position

(generator stops).

3. Close fuel valve (P).

Engine Speed

NOTE: Do not tamper with governor setting to

increase maximum engine speed.
Overspeed is hazardous and will void
warranty.

7

34 590 01 Rev. A

KohlerPower.com

EN

Oil Recommendations

We recommend use of Kohler oils for best
performance. Other high-quality detergent
oils (including synthetic) of API (American
Petroleum Institute) service class SJ or higher
are acceptable. Select viscosity based on air
temperature at time of operation as shown in
table below.

°F -20 020324060

50 80 100

°C -30 -20 -10 0 10 20 30 40

5W-30

10W-30

SAE 30

Check Oil Level

NOTE: To prevent extensive engine wear or

damage, never run engine with oil level
below or above operating range
indicator on dipstick (T).

Ensure engine is cool. Clean dipstick area of
any debris.

1. Remove dipstick (T); wipe oil off. Reinsert
dipstick (T) into tube; press completely down.

2. Remove dipstick (T); check oil level. Level
should be at top of indicator on dipstick (T).

3. If oil is low on indicator, add oil up to top of
indicator mark.

4. Reinstall and secure dipstick (T).

Change Oil and Filter

Change oil while engine is warm.

1. Clean area around dipstick (T) and oil drain
plug (U). Remove oil drain plug (U) and
dipstick (T). Allow oil to drain completely.

2. Clean area around oil lter (V). Place a
container under lter to catch any oil and
remove lter. Wipe off mounting surface.

Reinstall oil drain plug (U). Torque to 10 ft. lb.
(13.6 N·m).

3. Place new lter in shallow pan with open end

up. Fill with new oil until oil reaches bottom of
threads. Allow 2 minutes for oil to be

absorbed by lter material.

4. Apply a thin lm of clean oil to rubber gasket
on new lter.

5. Refer to instructions on oil lter (V) for proper

installation.

6. Fill crankcase with new oil. Level should be
at top of indicator on dipstick (T).

7. Reinstall dipstick (T) and tighten securely.

8. Start engine; check for oil leaks. Stop engine;
correct leaks. Recheck oil level.

9. Dispose of used oil and lter in accordance

with local ordinances.

Oil Sentry™ (if equipped)

This switch is designed to prevent engine
from starting in a low oil or no oil condition. Oil
Sentry™ will shut down a running engine.

Fuel Recommendations

WARNING

Explosive Fuel can cause res

and severe burns.

Do not ll fuel tank while

generator is hot or running.

Gasoline is extremely ammable and

its vapors can explode if ignited. Store
gasoline only in approved containers, in
well ventilated, unoccupied buildings, away

from sparks or ames. Spilled fuel could

ignite if it comes in contact with hot parts or
sparks from ignition. Never use gasoline as a
cleaning agent.

NOTE: E15, E20 and E85 are NOT approved

and should NOT be used; effects of
old, stale or contaminated fuel are not
warrantable.

Fuel must meet these requirements:

● Clean, fresh, unleaded gasoline.

● Octane rating of 87(R+M)/2 or higher.

● Research Octane Number (RON) 90 octane

minimum.

● Gasoline up to 10% ethyl alcohol, 90%

unleaded is acceptable.

● Methyl Tertiary Butyl Ether (MTBE) and

unleaded gasoline blend (max 15% MTBE by
volume) are approved.

● Do not add oil to gasoline.

● Do not overll fuel tank.

● Do not use gasoline older than 30 days.

Check Fuel Level

WARNING

Explosive Fuel can cause res

and severe burns.

Do not ll fuel tank while

generator is hot or running.

Gasoline is extremely ammable and

its vapors can explode if ignited. Store
gasoline only in approved containers, in
well ventilated, unoccupied buildings, away

from sparks or ames. Spilled fuel could

ignite if it comes in contact with hot parts or
sparks from ignition. Never use gasoline as a
cleaning agent.

8 34 590 01 Rev. AKohlerPower.com

Engine Fuse Replacement

This engine has three (3) blade type automotive
fuses (R). Replacement fuses (R) must have
same rating as blown fuse. Use fuse chart
below to determine correct fuse (R).

Wire Color Fuse Rating
2 Solid Red Wires 10-amp Fuse
1 Red Wire with Black Stripe

1 Red Wire with White Stripe

10-amp Fuse

2 Purple Wires 30-amp Fuse

Air Cleaner

NOTE: Operating engine with loose or

damaged air cleaner components
could cause premature wear and
failure. Replace all bent or damaged
components.

NOTE: Paper element (AA) cannot be blown

out with compressed air.

Loosen knob (AF) and remove air cleaner cover
(AG).

Precleaner (AB):

1. Remove precleaner (AB) from paper element
(AA).

2. Replace or wash precleaner (AB) in warm
water with detergent. Rinse and allow to air
dry.

3. Saturate precleaner (AB) with new engine oil;
squeeze out excess oil.

4. Reinstall precleaner (AB) over paper element
(AA).

Paper Element (AA):

1. Clean area around element (AA). Remove
wing nut (AE), element cover (AD), and
paper element (AA) with precleaner (AB).

2. Separate precleaner (AB) from element (AA);
service precleaner (AB) and replace paper
element (AA).

3. Check condition of rubber seal (AC) and
replace if necessary.

4. Install new paper element (AA) on base (Z);
install precleaner (AB) over paper element
(AA); reinstall element cover (AD) and
secure with wing nut (AE).

Reinstall air cleaner cover (AG) and secure with
knob (AF).

Breather Tube

Ensure both ends of breather tube are properly
connected.

Visually check level of fuel. If necessary, ll up.

1. Unscrew fuel tank cap (O).

2. Fill fuel tank using a funnel, taking care not to

spill any fuel. Do not overll tank (there
should not be any fuel in ller neck).

3. Screw fuel tank cap (O) back on.

Fuel Filter

1. Open fuel tank cap (O).

2. Remove fuel lter (Q) from tank neck.

3. Clean fuel lter (Q) with a non-ammable
solvent or solvent with a high ash point. Dry

it fully. Replace as necessary.

4. Reinstall fuel lter (Q).

5. Reinstall fuel tank cap (O).

Electronic Fuel Injection (EFI) System

EFI is an electronically-controlled fuel
management system which is monitored by an
Electronic Control Unit (ECU). A Malfunction
Indicator Light (MIL) will illuminate if problems
or faults are detected. Servicing by a Kohler
portable dealer is necessary.

Fuel Line

High pressure fuel line meeting SAE R9
standard must be installed on Kohler Co.
engines equipped with an EFI system.

Fuel System Components

High pressure components inside fuel pump
module (W) are not serviceable. Engines are

equipped with a special EFI fuel lter (AH). See

Maintenance Schedule.`

Spark Plugs

CAUTION

Electrical Shock can cause injury.
Do not touch wires while

generator is running.

Never operate generator in rain or snow.
Never touch generator with wet hands or

electrical shock may occur.

Clean out spark plug recess. Remove plug and
replace.

1. Check gap using wire feeler gauge. Adjust

gap, see specication table for adjustment.

2. Install plug into cylinder head.

3. Torque spark plug (X) to 20 ft. lb. (27 N·m).

9

34 590 01 Rev. A

KohlerPower.com

EN

Air Cooling

WARNING

Hot Parts can cause severe
burns.

Do not touch generator while
operating or just after stopping.

Never operate generator with heat shields or
guards removed. Do not modify generator.

Place generator in a place where pedestrians
or children are not likely to touch generator.

Be sure to carry generator only by its
carrying handles.

Proper cooling is essential. To prevent over
heating, ensure air cooling inlet and outlet
areas are clean and unobstructed. Avoid
spraying water at wiring harness or any
electrical components. Refer to Maintenance
Schedule.

Ground Terminal

Ground terminal (I) connects earth line for
prevention of electric shock. When electric
device is grounded, be sure to ground
generator also.

Connect generator to ground: Attach a 6 AWG
(10 mm2) copper wire to generator’s ground
connection and to a galvanized steel grounding
rod (not provided) driven 3.3 ft. (1 m) into
ground.

Connecting Alternating Current (AC)

NOTE: Ensure all electric devices including

lines and plug connection are in good
condition before connection to
generator.

NOTE: Ensure total load is within generator

rated output.

NOTE: Ensure receptacle load current is within

receptacle rated current.

1. Start engine.

2. Ensure AC pilot light (C) is on.

3. Plug into AC receptacle (G, L, M or N).

4. Turn on any electric devices.

AC Rated Power

AC rated power is maximum amount of power
generator can support.

AC Maximum Power

AC maximum power is additional power
generator momentarily produces to aid in
starting of electrical devices requiring power
above generator's rated power requirements.

GFCI Receptacle

CAUTION

Electrical Shock can cause injury.
Do not touch wires while

generator is running.

Never operate generator in rain or snow.
Never touch generator with wet hands or

electrical shock may occur.

To reduce chance of electrical shock:

1. Do not attempt to operate equipment if
ground fault circuit interrupter (GFCI) RESET
button pops out repeatedly during use.

2. Remember that only receptacles labeled
GFCI have ground fault circuit interrupter
protection.

Ground Fault Circuit Interrupter (GFCI) stops
power to protected receptacles (G) if a ground
fault (electrical leak) is detected. If RESET
button pops out, equipment plugged into
receptacle (G) may be faulty. If this happens,
check equipment carefully. If equipment
appears to be in good condition, press RESET

button rmly until a click is heard. This will

restore power. If RESET button pops out again,
unplug equipment immediately. Contact a
Kohler portable dealer before attempting to use
it again.

GFCI Receptacle Test

1. Start generator.

2. Press TEST button, if functioning properly
RESET button should pop out, stopping
power to outlet.

3. If GFCI operation is correct, push RESET
button in. If GFCI operates incorrectly,
contact a Kohler portable dealer.

Overload (Capacity of Generator)

Never exceed rated load of generator (in Amps
and/or Watts) when it is running continuously.

See specications table for rated outputs.

Before connecting and operating generator,
calculate electrical power required by electric
appliances (in Watts). This electrical power
rating is usually found on manufacturer's
plate on bulbs, electrical appliances, motors,
etc. Sum total of power required by these
appliances should not exceed nominal power
rating of generator.

Circuit protectors (F) and circuit breaker (E)
will stop power to protected receptacles (G, H,
L, M or N) when an overload of a connected
electrical device is detected or AC output
voltage rises to protect generator and any
connected electric devices.

10 34 590 01 Rev. AKohlerPower.com

When overload occurs and power generation
stops, proceed as follows:

1. Turn off any connected electric devices and
stop generator.

2. Reduce total wattage of connected electric
devices within application range.

3. Check for blockages in cooling air inlet and
outlet areas and around control unit. If any
blockages are found, remove them.

4. After checking, restart generator.

Battery Charging Using DC Receptacle

CAUTION

Electrical Shock can cause injury.
Do not touch wires while

generator is running.

Never operate generator in rain or snow.
Never touch generator with wet hands or

electrical shock may occur.

NOTE: This section refers to charging 12V

batteries in other equipment like motor
vehicles or off-road vehicles. No
jump-starting is possible.

NOTE: Follow safety procedures when

handling batteries to avoid damage to
electrical components and battery
explosions. Refer to battery
manufacturers safety data sheet on
safety risks of working with batteries.
Refer to battery manufacturer's
instruction on battery charging/
maintaining procedures.

NOTE: Generator DC rated voltage is 12V DC

circuit protector (F) will turn off
automatically if current above rated

ows during battery charging. Start
generator rst, then connect generator

to battery for charging. Before starting
to charge battery, ensure DC circuit
protector (F) is in RESET position. If
DC circuit protector (F) turns off again,
stop charging battery immediately and
contact a Kohler portable dealer.

NOTE: Do not connect a VRLA (valve

regulated lead acid) battery. To charge
a VRLA battery, a special (constant­voltage) battery charger is required.

NOTE: Do not connect any load to battery or

use engine starter motor while
charging. This causes high current to

ow through generator which will burn

out coil.

NOTE: Prior to charging battery, remove

positive and negative cables to battery.

1. Start generator.

2. Press DC circuit protector (F) in.

3. Connect red battery charger lead to positive
battery terminal. Connect black battery
charger lead to negative battery terminal. Do
not reverse these positions. Connect cord to
DC receptacle (H).

Operating Range of DC Power Supply
(Charging 12V battery only):

This power source is designed to charge
batteries up to 40Ah that are half-discharged.
Do not charge batteries of a higher capacity
than 40Ah.

12V Battery:

Time required for recharging a battery varies
depending on discharge level of battery. When

specic gravity of battery reaches 1.26 to 1.28,

charging is complete. When charging, check

battery’s specic gravity once an hour. Average

time for charging a half-discharged 40Ah
battery is approximately 5 hours. Be sure to

check battery uid level before charging.

DC Circuit Protector

NOTE: Reduce load of connected electric

device below specied rated output of

generator if DC circuit protector (F)
turns off. If DC circuit protector (F)
turns off again, stop using device
immediately and contact a Kohler
portable dealer.

DC circuit protector (F) button will pop out,
stopping power to DC receptacle (H) when
electric device being connected to generator is

operating at current above rated ows. To use

this equipment again, press DC circuit protector
(F) button.

Starter Battery

As battery (S) is maintenance-free, just check
condition and tightness of connections and its
general cleanliness.

Circuit Breaker

Generating set's electrical circuit is protected
by one or more magnetothermal, differential or
thermal cut-out switches. If an overload and/or
short circuit occurs, supply of electrical energy
may be cut.

If necessary, replace circuit breaker (E) in
generating set with circuit breakers with

identical nominal ratings and specications.

Cleaning Generator Set

1. Remove all dust and debris from around
exhaust silencer.

2. Clean generator and in particular air inlets
and outlets of engine and alternator using a
cloth and a brush.

3. Check general condition of generator and, if
necessary, replace any faulty parts.

11

34 590 01 Rev. A

KohlerPower.com

EN

Replacing Protective Fuses

NOTE: Comply with technical specications for

fuses. Using wrong fuse may cause
damage to generator.

Replace fuses (J) in event of failures due to
overcurrents. Before replacing worn fuses
(J) with new ones, always contact a Kohler
portable dealer to determine cause of failure
and overcurrent.

1. Turn MODYS (B) key to OFF position.
Generator stops.

2. Unscrew 12V fuse holder for MODYS (B)
and lighting and 240V fuse holder for
MODYS (B) and working hours counter.

3. Visually check condition of both fuses (J).

4. Replace worn fuse(s) (J) with a new one of
5x20 type, rating 2A.

5. Screw two fuse holders back in.

Transporting Generator

Before transporting generator, check that bolts
are correctly tightened, close fuel valve (P)
and disconnect battery. Generator should be
transported in its normal operating position;
never lay it on its side. Ensure where generator
is to be stored or used is carefully prepared
beforehand.

Repairs/Service Parts

We recommend that you use a Kohler portable
dealer for all maintenance, service, and

replacement parts for engine. To nd a Kohler

portable dealer visit KohlerPower.com or call
1-800-544-2444 (U.S. and Canada).

Storage

Long-term storage of your generator will require
some preventative procedures to guard against
deterioration.

NOTE: Do not connect with any electrical

devices (unloaded operation).

If engine will be out of service for 2 months or
more follow procedure below.

1. Add Kohler PRO Series fuel treatment or
equivalent to fuel tank. Run engine 2-3
minutes to get stabilized fuel into fuel system
(failures due to untreated fuel are not
warrantable).

2. Change oil while engine is still warm from

operation. Remove spark plug(s) (X) and

pour about 1 oz. of engine oil into cylinder(s).

Replace spark plug(s) (X) and crank engine

slowly to distribute oil.

3. Clean generator.

4. Store generator in a dry, well-ventilated
place, with cover placed over it. When
covering generator, be sure to do so only

after engine and mufer/shield have

completely cooled down. Generator must
remain in same position as normal operation.

Repairing Minor Faults - MODYS Alarms and Faults

Pictograms

Color of

LED

Type of Fault Issue Possible Solution

Red

Engine

temperature

Shutdown: abnormal

engine temperature

Allow generator to cool

down and check air

cleaner and vents on

enclosure.

Red

Battery or

charging

alternator

Problem with alternator

charge output or weak

battery

Contact a Kohler

portable dealer.

Red

Oil pressure or

low oil level

Shutdown: incorrect oil

pressure or low oil level

Allow generator to cool

down, top up and check

oil level.

Red Non-starting fault

3 consecutive

unsuccessful starting

attempts

Check that generator has
been started according to

recommendations in this

manual.

Red Overspeed

Shutdown: generator

rotation speed

excessive

Contact a Kohler

portable dealer.

Flashing

Red

Speed too low

Shutdown: insufcient

generator rotation

speed

Contact a Kohler

portable dealer.

12 34 590 01 Rev. AKohlerPower.com

Troubleshooting

Do not attempt to service or replace major engine components, or any items that require special
timing or adjustment procedures. This work should be performed by a Kohler portable dealer.

Problem

Possible Cause

Engine Not

Starting/
Running

Abnormally

Engine

Stopped

No Electric

Current

Tripping of

Circuit

Breaker

Load connected to generating set
during start-up

●

Start and Stop control ON or OFF ●
Fuel valve closed ●
Fuel level too low ● ●
Unsuitable fuel ●
Oil level too low ● ●
Clogged air cleaner ●

Clogged fuel lter ●

Faulty starter battery. ●
Fuel supply blocked or leaking ● ●
Blocked ventilation inlets ●
Circuit protectors not actuated ●
Faulty appliance supply cord ●
Faulty electrical sockets ●
Faulty alternator ●
Device connected or faulty cord ●
Overload ●
Battery incorrectly connected ● ●
Faulty MODYS Fuses (J) ●

13

34 590 01 Rev. A

KohlerPower.com

EN

Specications

Model PRO 12.3 EFI

Overall Dimensions (L x W x H)

35.2 in. (895 mm)

22.4 in. (570 mm)

30.3 in. (770 mm)

Dry Weight 306 lbs. (162 kg)

AC Rated Power 10,500 Watt

(120 Volts x 87.5 Amps)
(240 Volts x 43.8 Amps)

AC Maximum Power 12,300 Watt

(120 Volts x 102.5 Amps)
(240 Volts x 51.3 Amps)

Number of Phase Single Phase 240 Volts
DC Rated Power 100 Watt (12 Volts x 8.3 Amps)

Engine Specications

Bore 3.2 in. (80 mm)
Stroke 2.72 in. (69 mm)
Displacement 42.4 cu. in. (694 cc)

Oil Capacity (Rell) 1.7-2.0 U.S. qt. (1.6-1.9 L)

Maximum Angle of Operation (@ full oil level)* 25°
Run Time 10 hours (1/2 load)
Fuel See fuel section
Fuel Tank Capacity 8.7 U.S. gal. (33.0 L)
Spark Plug Gap 0.03 in. (0.76 mm)

*Exceeding maximum angle of operation may cause engine damage from insufcient lubrication.
Additional specication information can be found at KohlerPower.com.

Exhaust Emission Control System for model PRO 12.3 EFI is EM, O2S, ECM, MPI for U.S. EPA,
California, and Europe.

14 34 590 01 Rev. AKohlerPower.com

Available Accessories

The most customizable generators the job site has ever seen.

Mobility Kit

Install Mobility Kit

NOTE: Place blocks underneath to raise

generator to install wheels and legs.

NOTE: A clamping device or an assistant to

hold assembly while installing kit will
make process easier.

Mobility kit includes 2 solid rubber wheels, 2
legs, 4 handles and mounting hardware.

1. Align cross member holes at center and
place screw into hole. Insert washer and
thread nut to screw. Tighten loosely.

2. Assemble rubber bumpers to cross member
and axle brace. Insert washer and thread nut
to rubber bumper screw. Tighten loosely.

3. Position legs under frame. Install screws
through frame into cross member. Insert
washer and thread nut to screw. Tighten
loosely.

4. Align holes in axle to axle brace and frame.
Install screws through frame and axle. Insert
washer and thread nut to screw. Tighten
loosely.

5. Torque all nuts to 221 in. lb. (25 N·m).

6. Install wheels onto axle, push cotter pin into
hole in axle.

Install Handle:

1. Align handle with holes on frame.

2. Install screws with washers through leg.
Place another washer on other side and
thread nut on.

3. Tighten screws enough to allow handle to
move free.

Wireless Remote Kit

Wireless remote for starting or stopping
generator from a distance of up to 164 ft.
(50 m). No tools required for installation.

Wireless remote kit includes 1 wireless remote,
1 receiver which plugs into generator (AI) and
mounting hardware.