Kohler Command PRO CH18 User manual

0 WNER 's MANUAL
COMMAND S€R/€S
CHW.24 CH730=740
HOREONUL
CRANKSHAFT
60-
RUN'"

Safety Precautions
To insure safe operations please read the following statements and understandtheir meaning.
Also refer to your equipmentowner's manualfor other importantsafety information.This manual
contains safety precautionswhich are explainedbelow. Please readcarefully.
a WARNING
Warning is usedto indicatethe presenceof a hazard that can cause severe personalinjury, death,
or substantialpropertydamage if the warning is ignored.
a CAUTION
Caution is usedto indicatethe presenceof a hazard that will or can cause minor personalinjuryor
property damage if the caution is ignored.
NOTE
Note is usedto notifypeopleof installation,operation, or maintenanceinformationthat is important
but not hazard-related.
For YourSafety!
Theseprecautionsshouldbe followedat all times. Failure to follow theseprecautionscould result
in injury to yourself and others.
I a WARNING
Explosive Fuel can cause fires and
severe burns.
Stop engine before filling fuel tank.
Explosive Fuel!
Gasolineis extremely flammable
and its vaporscan explodeif
ignited. Storegasoline only in
approvedcontainers,in well
ventilated,unoccupiedbuildings,
away from sparks or flames.Do not
fill the fuel tank while the engine is
hot or running,since spilled fuel
could ignite if it comes in contact
withhotparts or sparks from
ignition.Do not start the engine near
spilled fuel. Never use gasolineas a
cleaningagent.
a WARNING
Rotating Parts can cause severe
injury.
Stay away while engine is in
operation.
RotatingParts!
Keephands, feet,hair,andclothing
away from all movingparts to
prevent injuty Never operatethe
engine withcovers, shrouds,or
guards removed.
a CAUTION
Yll 1
ElectricalShock can cause injury.
Do not touch wires while engine is
running.
I a WARNING
I Hot Parts can cause severe burns.
Do not touch engine while operating
or just after stopping.
Hot Parts!
Engine components can get
extremelyhot from operation. To
prevent severeburns, do not touch
theseareas while the engine is
running,or immediatelyafter it is
turned off. Never operate the engine
withheat shieldsor guards
removed.
California
Proposition
65 Warning
Engine exhaustfrom this product
containschemicalsknown to the
Stateof Californiato cause
cancer,birthdefects,or other
reproductiveharm.
ElectricalShock!
Never touch electrical wiresor
components while the engineis
running. Theycan be sources of
electricalshock.
2

Safefy Precautions (Conf.)
WARNING
Accidental Starts can cause severe
injury or death.
Disconnect and ground spark plug
leads before sewicing.
Accidental Starts!
Disabingengine. Accidents/
staringcan cause severe injuv
or death.
Before workingon the
engine or equipment,disablethe
engineas follows:
1) Disconnectthe
sparkplug lead(s).
2) Disconnect
negative
(-) batterycable from
battery.
a WARNING
CarbonMonoxide can cause
severe nausea, fainting or death.
Do not operate engine in closed or
confined area.
\. -6
I Explosive Gas can cause fires and
severe acid burns.
Charge battey only in a well
ventilated area. Keep
sources of
ianition awav.
Lethal Exhaust Gases!
Engine exhaustgases contain
poisonous carbon monoxide.
Carbonmonoxide is odorless,
colorless,and can causedeath if
inhaled.Avoid inhaling exhaust
Explosive Gas!
Batteriesproduce explosive
hydrogen gas whilebeing charged.
Toprevent a fire or explosion,
chargebatteries only in well
ventilatedareas. Keep sparks, open
fumes,andnever run-the enginein
a closedbuilding or confinedarea. flames, and other sources of ignitionaway from thebattery atall
times. Keepbatteriesout of the
reach of children.Remove all
jewelry whenservicingbatteries.
'
Beforedisconnectingthe negative
(-) groundcable,make sure all
switches are
OFF: If ON, a spark
will occurat thegroundcable
terminalwhichcould cause an
explosionif hydrogen gas or
gasoline vaporsarepresent.
Congratulations -You have selected a fine four-cycle,twin cylinder,air-cooledengine. Kohler designs long life
strengthand on-the-jobdurability into each engine
... makinga Kohler engine dependable ... dependabilityyou can
count on. Hereare some reasons why:
Efficientoverheadvalve design and full pressure lubrication provide maximum power,torque, and reliability
under all operatingconditions.
Dependable, maintenance-freeelectronic ignitionensures fast, easy starts time after time.
Kohler engines are easy to service. All routine service areas like the dipstick, oil fill, air cleaner, and spark
plugs are easily and quickly accessible.
Partssubject to the most wear and tear (likethe cylinder liner* and camshaft)are made from precision
formulated cast iron. Becausethe cylinder liner* can be rebored,these engines can last even longer.
*Some CH25/26 engines have POWER-BORETMCylinders.These cylindersare platedwith nickel-siliconto
give increasedpower,virtually permanent cylinder life, superior oil control, and reducedexhaust emissions.
These cylinderscannot be rebored.
Every Kohlerengine is backed by a worldwide networkof over 10,000distributorsand dealers. Service
support isjust a phonecall away. Call 1-800-544-2444
(U.S. & Canada)for Sales & Serviceassistance.
To keepyour engine in top operatingcondition,follow the maintenanceproceduresin this manual.
3

Dipstick
\
Air Cleaner
OilFill,
' Side Oil Drain Plugs /
:igure I, TypicalCommandHorizontalShaft Engine (CH18-25,CH730,740),
Oil
anifold
Coil
lnjecta
' 1 Rectifier-Regulafor
Figure 2. CH26 CommandHorizontal Shaft Engine,
4

Oil Recommendations
Usingthe propertype and weight of oil inthe
crankcase is extremely important.
So is checkingoil
dailyand changingoil regularly.Failureto usethe
correctoil, or usingdirty oil, causes prematureengine
wear and failure.
Oil Type
Use highquality detergentoil of API (American
Petroleum Institute)service class
SC; SH, SJ or
higher.
Selectthe viscosity basedon the air
temperatureat the time of operationas shown in the
followingtable.
RECOMMENDED SAE VISCOSITY GRADES
v
*Use of syntheticoil having 5W-20 or 5W-30 rating is
**Syntheticoils will providebetter startingin extreme
rigure 3. ViscosityGrades Table.
acceptable,upto 40°F.
cold (below
-1 0°F).
NOTE: Usingother than service class SG,
SH, SJ or
higheroil or extendingoil change intervals
longerthan recommendedcan cause engine
damage.
Alogo or symbolon oilcontainersidentifiestheAPI
service classand SAEviscositygrade. See Figure
4.
Figure 4. Oil ContainerLogo,
Refer to “MaintenanceInstructions”beginning on
page
8 for detailed oil check, oil change,and oil
filter change procedures,
Fuel Recommendations
Gasolineis extremely flammableand its vaporscan
explodeif ignited. Storegasoline only in approved
containers,in well ventilated,unoccupiedbuildings,
away from sparks or flames.
Do not fill the fuel tank
while the engineis hot or running,sincespilled fuel
could ignite if it comes in contact withhot parts or
sparks from ignition.
Do not start the engine near
spilled fuel. Never use gasolineas a cleaning agent.
WARNING: ExplosiveFuel!
General Recornmendations
Purchasegasoline in small quantitiesand store in
clean,approvedcontainers.Acontainer with acapacity
of
2 gallonsor less with a pouringspout is
recommended.Such a containeris easier to handle
and helpseliminatespillageduring refueling.
Do not use gasoline left over from the previousseason,
to minimizegum depositsin fuel system andto insure
easy starting.
Do not add oilto the gasoline.
Do not overfillthe fuel tank. Leave roomfor the fuel to
expand.
Fuel Type
For best resultsuse only clean, fresh, unleaded
gasoline with a pump sticker octane rating of 87 or
higher. Incountriesusingthe Research method, it
shouldbe
90 octane minimum.
Unleadedgasoline is recommendedas it leaves less
combustionchamber depositsand reducesharmful
exhaust emissions. Leadedgasoline is not
recommendedand
must not be usedon CH26
engine,or on other modelswhere exhaust emissions
are regulated.
Gasoline/Alcoholblends
Gasohol (upto 10% ethylalcohol, 90% unleaded
gasoline byvolume) is approvedas a fuel for Kohler
engines. Other gasoline/alcohol blendsare not
approved.
Gasoline/Etherblends
MethylTertiaryButyl Ether (MTBE) and unleaded
gasoline blends(upto a maximumof
15% MTBEby
volume)are approvedas a fuel for Kohlerengines.
Other gasoline/ether blendsare notapproved.
5

Engine Identification Numbers
When ordering parts, or in any communication
involvingan engine, always give the
Model,
Specification,and Serial Numbers
of the engine.
CategoryC
I EPA I 250 hours
The engine identificationnumbersappear on a decal
affixedto the engine shrouding. Include letter suffixes,
if there are any.
CategoryB CategoryA
500 hours 1000 hours
Recordyour engine identification numbers on the
identificationlabel below (Figure
5) for future reference.
Moderate
125 hours
-- IMPORTANT ENGINE INFORMATION
THIS ENGINE MEETS U.S. EPA 2004 AND
Intermediate Extended
250 hours
500 hours
CALIFORNIA 2006 AND LATER EMISSION
CONTROL REGULATIONSFOR SI SORE*
FAMILY
DISPL, (CC)
MODEL NO,
SPEC. NO,
eN11236
SERIALNO,
EMISSION COMPLIANCE PERIOD:
EPA: CARB:
THIS ENGINE IS CERTIFIEDTO OPERATE
ON:
REFER TO OWNER'S MANUAL FOR SAFETY,
MAINTENANCE SPECS AND ADJUSTMENTS.
FOR SALES/SERVICE IN US/CANADA, CALL:
www. kohlerengines.com
1-800-544-2444
u
KOHLER CO. KOHLER, WISCONSIN USA
*Small Off-RoadEngines
7gure
5. Engine ldentification Label,
The EmissionCompliance Period referredto on the
EmissionControl or Air Indexlabel indicatesthe
numberof operating hoursfor which the engine has
been shown to meet Federaland CARB emission
requirements. The followingtable providesthe Engine
Compliance Period(in hours) associatedwith the
category descriptorfound on the certification label.
Emission CompliancePeriod (Hours)
I I
Refer to certification labelfor engine displacement.
Exhaust EmissionControl System for models
CHI8,20,22,23,25,730,740 is EM. Exhaust Emission
Control System for modelCH26 is EM, 02S, ECM, MFI.
Model Designation
ModelCH20S for example:C designatesCommand
engine, H designateshorizontalcrankshaft,and 20
designateshorsepower. Some model numbers
(CH730) use the approximate displacementratherthan
horsepower.A letter suffix designatesa specific version
as follows:
Suffix Designates
S Electric Start
ST Electric StarVRetractableStart
QS Quiet ModeVElectricStart
EP Electric Plant
cs Clutch ModeVElectricStart
Operating Instructions
Also read the operating instructionsof the equipment
this enginepowers.
Pre-Start Checklist
Check oil level.Add oil if low. Do not overfill.
Check fuel level.Add fuel if low.
Check cooling air intake areas and external
surfacesof engine. Make sure they are clean and
unobstructed.
Check that the air cleaner components and all
shrouds, equipmentcovers, and guards are in
place and securelyfastened.
Checkthat any clutchesor transmissions are
disengaged or placedin neutral.This isespecially
importanton equipment with hydrostaticdrive.The
shift lever must beexactly in neutralto prevent
resistancewhich could keepthe engine from starting.
a WARNING: Lethal Exhaust Gases!
Engineexhaustgases containpoisonous carbon
monoxide. Carbonmonoxideis odorless,colorless,
and can cause deathif inhaled.Avoid inhalingexhaust
fumes,and never run the engine in a closedbuildingor
confinedarea.
Cold WeatherStarting Hints
1. Be sure to usethe proper oil for the temperature
expected. See Figure3 on page
5.
2. Disengageall possibleexternal loads.
3. Be sure the battery is in good condition.Awarm
battery has much more startingcapacity than a
cold battery.
4. Use fresh winter grade fuel. NOTE:Winter grade
gasoline has highervolatility to improvestarting.
Do not use gasoline left over from summer.
6

Starting
1. Place the throttle control midway betweenthe
“slow” and “fast” positions. Place the choke
control (non-EFIenginesonly) intothe
“on”
position. See Figure6.
Figure 6, Optional Engine Mounted Throttleand
Choke Controls(CH18-25,CH730,740),
2. Startthe engine byactivatingthe key switch.
Releasethe switch as soon as the engine starts.
NOTE:
NOTE:
NOTE:
Do not crank the engine continuouslyfor
morethan
10 secondsat a time. If the
enginedoes not start, allow a
60 second
cool down period betweenstarting
attempts. Failureto follow these
guidelinescan burn out, or permanently
damage, the starter motor.
Upon start-up,a metallic ticking may
occur.This iscaused by hydraulic lifter
leakdownduring storage. Runthe engine
for
5 minutes. The noisewill normally
cease in the first minute.
If noise
continues, run the engineat mid-throttle
for
20 minutes. If noise persists, take the
engineto your local authorized Kohler
Engine Service Dealer.
If the engine developssufficientspeed to
disengagethe starter but does not keep
running (afalse start),engine rotation
must be allowedto come to a complete
stop before attemptingto restart the
engine.
If the starter is engagedwhile the
flywheel is rotating, the starter pinionand
flywheel ring gear mayclash resulting in
damage to the starter.
If the starter does not turn the engineover, shut
off starter immediately. Do not make further
attemptsto start the engine untilthe condition is
corrected. Do notjump start usinganother battery
(refer to “Battery” on this page). Seeyour Kohler
Engine Service Dealer for service assistance.
CarburetedEngines Only:
3.
4.
For a ColdEngine -Gradually returnthe choke
controlto the
“off” position after the engine starts
and warms up.
The engine/equipment may be operatedduring
the warm-up period, but it may be necessaryto
leavethe choke partiallyon untilthe engine
warms up.
For a WarmEngine - Returnchoke to “off”
position as soon as engine starts.
Stopping
1. Removethe load by disengagingall PTO driven
attachments.
2. For CarburetedEngines WithoutA Shutdown
Solenoid:
Movethe throttle to the “slow” or
“low”idle position.Allow the engine to run at idle
for 30-60 seconds; then stop the engine.
For CarburetedEnginesEquipped WithA
ShutdownSolenoid:
Positionthe throttle control
somewhere between half and full throttle; then
stop the engine.
For EFl Engines: Movethe throttleto the “slow”
or “idle”position;turn key
“off” to stop engine.
Battery
A 12 volt battery is normallyused. Refer to the
operating instructionsof the equipmentthis engine
powersfor specific battery requirements.
If the battery charge is not sufficient to crank the
engine, rechargethe battery (see page 13).
Operating
Angle of Operation
This enginewill operatecontinuouslyat angles upto
25”. Check oil levelto assure crankcase oil level is at
the
“F’ mark on the dipstick.
Refer to the operating instructionsof the equipment
this engine powers. Becauseof equipment design or
application,there may be more stringent restrictions
regardingthe angle of operation.
NOTE: Do not operatethis engine continuouslyat
angles exceeding
25” in any direction. Engine
damage could result from insufficient
lubrication.
7

Cooling Engine Speed
NOTE: If debris builds up on the grass screen or
other coolingair intakeareas, stop the engine
immediatelyandclean. Operatingthe engine
with blockedor dirty air intakeand cooling
areas can cause extensive damagedue to
overheating. load.
NOTE: Do nottamperwith the governorsettingto
increasethe maximumengine speed.
Overspeedis hazardousand will void the
enginewarranty.The maximumallowable high
idle speed for these engines is
3750 RPM, no
a WARNING: Hot Parts!
Engine components can get extremelyhot from
operation. To prevent severeburns, do not touch these
areas while the engine is running,or immediately after
it is turned off. Never operatethe engine withheat
shieldsor guards removed.
Frequency
Daily or Before
StartingEngine
Maintenance Instructions
Maintenance,repai5 or replacementof the emission controldevicesand systems, whichare being done at
the customersexpense,may be performed by any non-road enginerepair establishmentor individual,
Warrantyrepairsmust be performed by an authorized Kohler service outlet,
a WARNING: AccidentalStarts!
DisabHng engine.Accidenta/staHingcan cause severe injuryor death. Before workingon the engine or
equipment,disablethe engineas follows: I) Disconnectthesparkplug lead@).2)Disconnectnegative (-) battery
cable from battery.
Maintenance Required
Fillfuel tank.
Check oil level.
Check air cleanerfor dirty’, loose,or damaged parts.
Check air intakeand coolingareas, clean as necessary’.
Maintenance Schedule
These requiredmaintenanceproceduresshould be performedat the frequency stated in the table. They should
also be includedas partof any seasonaltune-up.
Every25Hours
Every
700 Hours
Hours
Every250 Hours
Service precleanerelement’.
Replaceair cleaner element’.
Changeoil. (Morefrequently undersevere conditions.)
Removecoolingshrouds and clean coolingareas’,3.
Check oil cooler fins, clean as necessary (if equipped).
Check spark plugconditionand gap.
Changeoil filter.
Replaceheavy-dutyair cleaner element and check inner element’.
Every 500 Hours
Every
7500 Hours
Annually or
Havebendix starter drive serviced2.
Every 500 Hours
Havesolenoid shift starter disassembled and cleaned2.
Have crankshaft spline lubricated2.
Replacefuel filter’ (EFI engines).
8

Check Oil Level
The importanceof checking and maintainingthe proper
oil level in the crankcase cannot be overemphasized.
Check oil
BEFORE EACH USE as follows:
1. Make sure the engine is stopped, level, and is
cool
so the oil has had time to drain into the sump.
2. To keep dirt, debris, etc., out of the engine,clean
the area around the dipstick before removing it.
3. Removethe dipstick; wipe oil off. Reinsertthe
dipstick intothe tube and press all the way down.
4. Removethe dipstick and check the oil level.
The oil levelshould be up to, but not over, the
“F
mark on the dipstick. See Figure 7.
I
I
Operating
Range
“F” Mark
Figure
7. Oil Level Dipstick,
5. If the level is low, add oil of the propertype, upto
the
“F mark on the dipstick. (Refer to “Oil Type”
on page
5.) Always checkthe levelwith the
dipstick before adding more oil.
NOTE: To preventextensiveenginewear or
damage, always maintainthe proper oil
level in the crankcase. Never operatethe
enginewith the oil level belowthe
“L”
mark or over the “F’ mark on the dipstick.
Oil SentryTM
Some engines are equippedwith an optional Oil
SentryTMoil pressureswitch. If the oil pressure
decreases below an acceptable level,the Oil SentryTM
will either shut off the engine or activate a warning
signal, depending on the application.
NOTE: Make sure the oil level is checked
BEFORE
EACH
US€ and is maintainedupto the “F
mark on the dipstick. This includesengines
equippedwith Oil SentryTM.
Change Oil and Filter, Service Oil Cooler
Change Oil
Change oil after every 100 hours of operation (more
frequently under severeconditions). Refillwith service
class SG,
SH, SJ or higher oil as specified inthe
“Viscosity Grades”table (Figure
3) on page 5.
Changethe oil while the engine is still warm. The oil
will flow more freely and carry away more impurities.
Make sure the engine is levelwhen filling, checking,
and changing the oil.
Changethe oil as follows (see Figures
8 and 9):
1. To keep dirt, debris, etc., out of the engine, clean
the area aroundthe oil fill cap/dipstickbefore
removing it.
2. Remove one of the oil drain plugs, oil fill cap, and
dipstick. Be sure to allow ample time for complete
drainage.
3. Reinstallthe drain plug. Makesure it is tightened
to
13.6 N-m (10 ft. lb.) torque.
4. Fillthe crankcase,with new oil of the propertype,
to the
“F’ mark on the dipstick. Refer to “Oil Type”
on page
5. Always checkthe levelwith the dipstick
before adding more oil.
5. Reinstallthe oil fill cap and tighten securely.
Reinstall dipstick.
NOTE: To preventextensiveenginewear or
damage, always maintainthe proper oil
level in the crankcase. Never operatethe
enginewith the oil level belowthe
“L”
mark or over the “F’ mark on the dipstick.
oil Cooler
‘ Oil Drain Plug
I
Figure 8. Oil Drain Plugs, Oil Filter,and Oil Cooler
(CH25 shown),
9

Oil Drain’ Plug oil cooler
I
I
Service Oil Cooler
Someengines are equippedwith an oil cooler. One
style of oil cooler mounts on the engine crankcase and
hasthe oil filter on it (See Figure
8). The other style of
oil cooler is mounted on the blower housing (See
Figure
9), separate from the oil filter.
Inspectand clean the oil cooler
every 100 hours of
operation
(morefrequently under severe conditions).
Oil cooler must be keptfree of debris.
To servicethe crankcase mounted oil cooler clean
off
the outside fins with a brush or with compressed air.
Figure 9. Oil Drain Plugs, Oil Filter, and Oil Cooler
(CH26 shown),
Change Oil Filter
Replacethe oil filter at least every other oil change
(every200 hours of operation).
Always use a
genuineKohler oil filter,Part No. 12 050 OI-S.
Replacethe oil filter as follows:
1. Drainthe oil from the engine crankcase.
2. Allow the oil filter to drain.
3. Before removingthe oil filter, clean the area
around the oil filter to keep dirt and debris out of
the engine. Remove the old filter. Wipe off the
surface where the oil filter mounts.
4. Place a new replacementfilter in a shallow pan
with the open end up. Pour new oil, of the proper
type, inthrough the threadedcenter hole. Stop
pouringwhen the oil reachesthe bottomof the
threads.Allow a minute or two for the oil to be
absorbed by the filter material.
5. Put a drop of oil on your fingertip and wipe it on
the rubber gasket.
6. Installthe replacementoilfilter to the filter adapter or
oil cooler.Turnthe oil filter clockwise untilthe rubber
gasket contactsthefilter adapter or oilcooler,then
tighten the filter an additional
2/3 to 1 turn.
7. Reinstallthe drain plug. Make sure it is tightened
to
13.6 N-m (10 ft, lb.) torque.
8. Fillthe crankcasewith new oil of the propertype
to the
“F mark on the dipstick.
9. Start the engine and check for oil leaks. Correct
any leaks before placingthe engine into service.
Check oil level to be sure it is up to but not over
the
“F mark.
To servicethe blower housing mountedoil cooler,
clean the outside of fins with a brush. Removethe two
screws holdingthe cooler unit to the blower housing.
Tilt the cooler downward as shown in Figure
10. Clean
the insideof cooler with a brush as shown in Figure
10
or with compressedair.After cleaning, reinstall oil
cooler to blower housingwith two mountingscrews.
Figure 10,
Service Precleaner and Air Cleaner Element
This engine is equippedwith a replaceable,high
density paper air cleaner element. Most engines are
also equippedwith an oiled, foam precleanerwhich
surrounds the paper element.See Figure
11.
Figure 11. Air CleanerSystem Components,
10

Checkthe air cleaner daily or before starting the
engine.
Check for a buildup of dirt and debris around
the air cleaner system. Keepthis area clean.Also
check for loose or damagedcomponents. Replace all
bent or damaged air cleaner components.
NOTE: Operatingthe enginewith looseor damaged
air cleaner components could allow unfiltered
air intothe engine causing prematurewear
and failure.
ServicePrecleaner
If so equipped,wash and reoilthe precleanerevery 25
hours of operation (more often under extremely dusty
or dirtyconditions).
1.
2.
3.
4.
5.
6.
7.
Loosenthe cover retainingknoband removethe
cover.
Removethe precleanerfrom the paper element.
Wash the precleaner in warm water with
detergent. Rinsethe precleanerthoroughly untilall
traces of detergentare eliminated.Squeezeout
excess water (do not wring).Allow the precleaner
to air dry.
Saturatethe precleanerwith new engineoil.
Squeeze out all excess oil.
Reinstallthe precleanerover the paper element.
Reinstallthe air cleaner cover. Secure cover with
the cover retaining knob.
When precleaner replacement is necessary, order
genuine Kohlerparts.
I
24 083 024 61 mm deep x 173 mm O.D,
I
24 083 054 71 mm deep x 173 mm O.D,
I
ServicePaper Element
Every 100 hours of operation (more often under
extremelydusty or dirty conditions) replacethe paper
element.
1. Loosenthe cover retainingknoband removethe
cover.
2. Removethe elementcover nut, element cover,
and paper elementwith precleaner.
4.
5.
6.
7.
Do not wash the paper element or use
pressurizedair,
as this will damage the element.
Replace a dirty, bent, or damaged element with a
genuine Kohler element. Handlenew elements
carefully;do not use if the sealing surfaces are
bent or damaged.
When servicingthe air cleaner, check the air
cleaner base. Make sure it is securedand not
bent or damaged. Also, check the element cover
for damage or improper fit. Replace all damaged
air cleaner components.
NOTE: If any loosedirt or debrisfell on the air
cleaner basewhen the elementwas
removed, carefully remove it and wipe
the baseclean. Be careful that none of it
drops into the intake throat. Check the
conditionof the rubber seal on the air
cleaner stud.
If the condition is
questionablein any way, replace it with
the new seal packagedwith the
replacementelement.
Reinstallthe paper element, precleaner,element
cover, elementcover nut, and air cleaner cover.
Secure cover with the cover retainingknob.
When element replacement is necessary, order
genuine Kohlerparts.
47 083 034
24 083 034 65
mm deep x 178 mm O.D,
74 mm deep x 178 mm O.D,
Heavy-DutyAir Cleaner
To Service
Every 250 hours of operation (more often under
extremelydusty or dirty conditions), replacethe paper
elementand check inner element. Follow these steps.
1. Unhookthe two retainingclips and removethe
end cap from the air cleaner housing.
2. Pullthe air cleaner element out of the housing.
See Figure
12.
3. Removethe precleaner (if so equipped) from the
paper element. Servicethe precleaneras
described above.

Figure 12. Removing Elements,
3. After the main element is removed,checkthe
conditionof the inner element. It should be
replacedwhenever it appearsdirty,typically every
other timethe main element is replaced.Cleanthe
area aroundthe base of the inner element before
removingit,
so dirt does not get intothe engine.
4. Do not was the paper element and inner element
or use pressurizedair, this will damagedthe
elements. Replacedirty,bent or damaged
elementswith new genuine Kohler elementsas
required. Handle newelementscarefully; do not
use if the sealing surfacesare bent or damaged.
5. Check all partsfor wear, cracks, or damage.
Replaceany damagedcomponents.
6. Installthe new inner element, Kohler Part No.
25 083 04-S followed bythe outer element, Kohler
Part No.
25 083 01-S. Slideeachfully intoplace in
the air cleaner housing.
7. Reinstallthe endcap so the dust ejectorvalve is
down and securewith the two retainingclips. See
Figure
13.
Dust
Ejector
Valve
'igure
13, Heavy-DutyAir CleanerAssembly.
CleanAir Intake/CoolingAreas
To ensure propercooling, make sure the grass screen,
coolingfins, and other external surfaces of the engine
are kept clean
at all times.
Every 100 hours of operation (moreoften under
extremelydusty, dirty conditions), removethe blower
housing* and other coolingshrouds. Cleanthe cooling
fins and external surfaces as necessay. Makesure the
coolingshrouds are reinstalled.
NOTE: Operatingthe enginewith a blockedgrass
screen,dirty or pluggedcoolingfins, and/or
coolingshrouds removed,will cause engine
damagedue to overheating.
*Cleanoutkits
25 755 20-S (black)or 25 755 21 -S
(gold) allow inspectionand cleanoutof the cooling
fins, without removingthe blowerhousing.
Ignition System
CarburetedEngines - Usean electronicCapacitive
Discharge(CD) ignitionsystem. Other than periodically
checkingheplacingthe spark plugs, no maintenance,
timing, or adjustmentsare necessaryor possiblewith
this system.
EFI Engines - Incorporatea computer-controlled
batteryignitionsystemwith individualcoils. Otherthan
periodicallycheckingheplacingthe spark plugs, no
maintenance,timing, or adjustmentsare necessaryor
possiblewith this system.
Check Spark Plugs
Every 200 hours of operation, removethe spark plugs,
check condition,and resetthe gap or replace with new
plugsas necessay.The standardspark plug is a
Champion@
RC12YC (Kohler Part No. 12 13202-S). A
high-performancespark plug, Champion@Premium
Gold
2071 (usedon Pro Series engines, Kohler Part
No.
12 132 06-S) isalso available. Equivalentalternate
brandplugscan also be used.
1. Before removingthe spark plug,clean the area
aroundthe baseof the plugto keep dirt and debris
out of the engine.
2. Removethe plugand check its condition.
Replacethe plugif worn or reuse is questionable.
NOTE: Do not clean the spark plugin a machine
usingabrasive grit. Some grit could
remaininthe spark plug and enter the
engine causing extensivewear and
damage.
12

3. Check the gap using a wire feeler gauge. Adjust
the gap to
0,76 mm (0.030 in,) by carefully
bending the ground electrode. See Figure 14.
Gro;: #
0.76mm I
Electrode -
(0,030 in,) Gap
7gure
14, ServicingSparkPlug,
4. Reinstallthe spark plug intothe cylinder head.
Torque the spark plug to
24.4-29J N-m
(18-22 ft. lb,).
Battery Charging
WARNING: Explosive Gas!
Batteriesproduce explosivehydrogen gas while being
charged. Toprevent a fire or explosion,charge
batteries only in well ventilatedareas. Keep sparks,
open flames,and other sources of ignition away from
thebatteryat all times.Keepbatteriesout of the reach
of children. Removealljewelry whenservicing
batteries.
Beforedisconnectingthe negative
(-) groundcable,
make sure all switches are OFF: If
ON, a spark will
occur at the ground cable terminal whichcouldcause
an explosionif hydrogen gas or gasoline vaporsare
present.
NOTE: Do not apply 12volt DC to killterminal of
ignition module.
Fuel System
a WARNING:Fuel System UnderPressure!
TheEFI fuelsystem operates under highpressure,
and the fuelfilter and fuel line usedmustbe approved
systemcomponents only Use of substituteparts can
result in system failure,gasolineleakageandpossible
explosion.
Fuel Filter
CarburetedEngines: Some enginesare equipped
with an in-linefuel filter. Periodicallyinspectthe filter
and replacewhen dirty.
Always usegenuineKohler
parts.
EFI Engines: A special, highvolume, high pressure
filter with greater filtration capabilities and internal
surface area is used. See Figure 15.
Fuel Filter
Figure
15. EFI Fuel Filter and Line,
Replacement is recommended every 1500 hours, or
morefrequently under extremelydusty or dirty
conditions.When replacementis necessary, always
use genuine Kohler parts.
Fuel Line
EFI Engines: A specialfuel line, capable of
withstandingthe high pressureof the EFIfuel system,
is used (must meet SAE R9 specifications).See Figure
15. If fuel line must be replaced, see your Kohler
Engine Service Dealer.
Carburetor Troubleshootingand
Adjustments
NOTE: Carburetoradjustmentsshould be made only
after the engine has warmed up.
The carburetor is designed to deliver the correct
fuel-to-air mixtureto the engine under all operating
conditions.To comply with current emission
regulations,the fuel mixture settings are made at the
factory and cannot be adjusted.
NOTE: To ensurecorrect engine operating at
altitudesabove 1525 meters
(SOOOft.), it may
be necessaryto have an authorized Kohler
dealer installa special high-altitudejet kit in
the carburetor.If a high-altitudekit has been
installed,the engine must be reconvertedto
the originaljet size, before it is operated at
lower altitudes,or overheatingand engine
damage can result.
13

Troubleshooting
If engine troubles are experiencedthat appear to be
fuel system related,check the followingareas before
adjustingthe carburetor.
Make sure the fuel tank is filled with clean, fresh
gasoline.
Make sure the fuel tank cap vent is not blocked
andthat it isoperating properly.
If the fuel tank is equippedwith a shut-off valve,
make sure it is open.
If the engine is equippedwith an in-linefuel filter,
make sure it is clean and unobstructed. Replace
the filter if necessary.
Make sure fuel is reachingthe carburetor. This
includeschecking the fuel linesand fuel pumpfor
restrictionsor faulty components, replaceas
necessary.
Make sure the air cleaner element is clean and all
air cleaner element componentsare fastened
securely.
If, after checking the items listed above, the engine is
hardto start, runs roughly,or stalls at low idle speed, it
may be necessaryto adjust or service the carburetor.
Adjust Carburetor
There are no accessible mixture adjustment screws on
the carburetor.The only settingwhich can be changed
is the low idle speed.
1. Start the engine and run at half throttle for 5 to 10
minutesto warm up. The engine must be warm
before makingfinal settings (steps
2 and 3).
2. LowldleSpeedSetting: Place the throttle control
intothe “idle”or “slow”position. Set the low idle
speedto
7200 RPM” (+ 75 RPM) by turning the
low idle speed adjustingscrew
in or out. Check
the speed usinga tachometer.
*NOTE: The actual low idle speed depends on the
application
- refer to equipment
manufacturers recommendations.The
standardlow idle speed is
1200 RPM.
3. If proper operation is not restored after adjusting
the low idlespeed,carburetorservicingbyan
authorizedKohler Engine Service Dealer may be
required.
Electronic Fuel Injection (EFI)System
The EFI system is a complete, electronically-controlled
fuel managementsystem, designedto deliver a
preciselycontrolledfuel flow under all operating
conditions.The electroniccontrol unit (ECU),the
“brain” of the system, automaticallyadjusts fuel
deliveryand ignitiontiming based upon load, speed,
operatingtemperature, and exhaust emission levels.
The low idle speed is the only manualadjustment
possible.
The ECUcontinuously monitorsoperation of the EFI
system. If it detectsa problem or fault within the
system, it will illuminatethe malfunctionindicator light
(MIL), which is mountedinview of the operator.This is
a signal that normal, programmedoperation has been
affected, and service by an authorized Kohler Engine
Dealer is required.
NOTE: The EFI system requires a rather complex
wiring harnessto carry the electrical signals
betweenthe sensors andthe ECU.
Do not
spray water at the wiring harnessor any of the
electricalcomponents, especiallythe ECU, as
it could cause malfunction,damage, or failure.
Troubleshooting
If the MILcomes on, or the engine becomes hardto
start, runs roughly,or stalls at low idle speed, initial
checks should be made in the following areas:
Make sure the fuel tank is filled with clean, fresh
gasoline, and shut-off valve (if
so equipped) is
openedcompletely.
Make sure fuel tank vent cap is not blocked and it
is operatingproperly.
Make sure the air cleaner element and precleaner
are clean and all componentsare properly
secured. Clean or replaceas necessary.
14

Make sure the proper fuel filter is being used, and
it is clean and unobstructed.Replacefilter
only
with genuine Kohler parts.
Make sure all connectionsto sensors, ECU, and
fuel injectors are properlysecured.
Make sure a good 12 volt battery is being used and
isfully charged.
If these checks do not correct the problem, or the MIL
remains
on, further diagnosis and servicing by an
authorized Kohler Engine Dealer is necessary.
Adjustment - EFI ThrottleBody
Low IdleSpeed (RPM) isthe only adjustmentthat can
be made.
All other fuel calibrationsare permanently
preset and controlled by the ECU.The standardlow idle
speed is
1500 RPM” (k 75 RPM).
*NOTE: The actual low idle speed depends on the
application
-- refer to equipment
manufacturer’s recommendations.
When an EFI engine is started cold, the ECUwill be
using internal programmingfor cold running, and the
idlespeed mayvary from the manual setting. Do not
attempt to performany readjustmentduringthis “warm-
up” period.
If adjustment is to be made, the engine must be at
operatingtemperature,air cleaner in place, and check
engine light must be
off (nofault codes present).
1. Start the engine and run at half throttle for 5 to 10
minutesto warm up.
2. Placethe throttle control intothe “id1e”or “slow”
position.
3. Turn the low idle speed adjusting screw in or out
and check RPMwith a tachometer. See Figure
17.
Adiustina Screw
I
Figure 17, EFI Throttle Body Manifold.
Troubleshooting
When troubles occur, be sure to check the simple causes which, at first, may seem too obvious to be considered.
For example, a starting problemcould be caused by an empty fuel tank. Some commoncauses of engine troubles
are listedinthe following table.
Do not attempt to service or replace major enginecomponents, or any itemsthat requirespecialtiming or
adjustment procedures.Haveyour Kohler Engine Service Dealerdo this work.
Possible Cause No Improper Dirt In Dirty Incorrect Engine DirtyAir Faulty
Problem Fuel Fuel Fuel Line/System Grass Screen Oil Level Overloaded Cleaner SparkPlug
Will Not Start
Hard Starting
StopsSuddenly
Lacks Power
Operates Erratically
Knocks or Pings
Skips or Misfires
Backfires
Overheats
High Fuel Consumption
15

Storage
If the engine will be out of service for two monthsor
more, use the following storage procedure:
1.
2.
3.
4.
5.
Clean the exterior surfaces of the engine. On EFI
engines, avoid sprayingwater at the wiring
harnessor any of the electrical components.
Changethe oil andfilter whilethe engine isstill
warm from operation.See “Change Oil and Oil
Filter”on page
9.
The fuel system must be completely emptied, or
the gasoline must betreated with a stabilizer to
prevent deterioration. If you chooseto use a
stabilizer, follow the manufacturers
recommendations,and add the correct amount for
the capacity of the fuel system. Fillthe fuel tank
with clean, fresh gasoline. Runthe enginefor 2-3
minutesto get stabilizedfuel into the rest of the
system. Closefuel shut-off valve when unit is
being stored or transported.
To empty the system, run the engine untilthe tank
and system are empty.
Removethe spark plugs.Add one tablespoonof
engine oil into each spark plug hole. Installthe
plugs, but do not connect the plug leads. Crank
the engine two or three revolutions.
Storethe engine in a clean, dry place.
Parts Ordering
The engine Specification,Model,and Serial Numbers
are requiredwhen ordering replacementpartsfrom
your Kohler Engine Service Dealer.These numbers are
found on the identificationplate which is affixed to the
engine shrouding. Include letter suffixes if there are
any. See “Engine IdentificationNumbers” on page 6.
Always insist on genuineKohlerparts. All genuine
Kohlerparts meet strict standardsfor fit, reliability,and
performance.
Major Repair
Major repair information is available in Kohler Engine
Service Manuals.However, major repair generally
requiresthe attentionof a trained mechanic and the
use of specialtools and equipment.Your Kohler
Engine Service Dealer hasthe facilities, training, and
genuine Kohler replacement parts necessary to
performthis service. For Sales
& Serviceassistance
call 1-800-544-2444
(U.S. & Canada)or contactyour
Kohler Engine Dealeror Service Distributor,they’re in
theYellow Pages under Engines-Gasoline.
Specifications
Model: ......................................................................... CH18,20,22 ........................................... CH25,26,730,740
Bore: ...................................... rnrn (in.) ...................... 77 (3.03)# ............................................... 83 (3.27)
Stroke: .................................... rnrn (in.) ...................... 67 (2.64) ................................................ 67 (2.64)
Displacement: ........................ cm3 (in3) ...................... 624 (38.1)# ............................................. 725 (44.0)
Power (Q3600 RPM): .......... kW (HP) ...................... 13.4 (18*)/14.9 (20*)/16.4(22*) ............ 18.4 (25*)/19.4(26)
18.6 (25*)/20.1(27)
Max. Torque (Q RPM): ......... N.rn (ft. Ib.) ...................... 41 (30) Q2500 ........................................ 54 (39.5) Q2200
44 (32) Q2500 ........................................ 56.4 (41.6) Q2200
45 (33) Q2500
........................................ 52 (38) Q2800
54 (40) Q2800
Compression Ratio: .................................................... 8.51 ...................................................... 9.O:l
Weight: .................................... kg (Ib.) ...................... 41 (90) ................................................... 43 (94)
Oil Capacity (w/filter): ........ L (U.S. qt.) ...................... 2 (2.1) .................................................... 2 (2.1)
Lubrication: ..........................................
..
Full Pressurew/full Flow Filter
Exhaust Emission Control System
for models CH18,20,22,23,25,730,740 is EM.
Exhaust Emission Control System
for model CH26 is EM, 02S, ECM, MFI.
*Horsepowerratings are established in accordance with Society
of Automotive Engineers - Small Engine Test Code 41 995
GROSS. Kohler Co. reserves the right to change product specifications, design, and standard equipment without notice and
without incurring obligation.
#CH22 or CH23 engines with Spec. Numbers of 765xx have bore size of 80 rnrn (3.15 in.) and displacement of 674 cm3
(41.1 in3).
16

LIMITED 2 YEAR COMMANDENGINE WARRANTY
We warrant to the original consumer that each new COMMAND engine sold by uswill befree from manufacturing defects in materials or
workmanship in normal service for a period of
two (2) years from date of purchase, provided it is operated and maintained in accordancewith
Kohler Co.’s instructions and manuals.
Our obligation under this warranty is expressly limited, at our option, to the replacement or repair at Kohler Co., Kohler, Wisconsin 53044, or
at a service facility designated by us of such partsas inspection shall disclose to have been defective.
EXCLUSIONS:
Mufflerson engines used commercially(non-residential)are warranted for one (1) year from date of purchase, except catalytic mufflers,
which are warranted for two
(2) years.
This warranty does not apply to defects caused by casualty or unreasonable use, including faulty repairs by others andfailure to provide
reasonable and necessay maintenance.
The followingitems are not covered by this warranty:
Engineaccessories such as fuel tanks, clutches, transmissions, power-drive assemblies, and batteries, unless supplied or installed by Kohler
Co. These are subject to the warranties, if any, of their manufacturers.
WE SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY KIND, includingbut not
limitedto labor costs or transportation charges in connection with the repair or replacement of defective parts.
ANY IMPLIEDOR STATUARY WARRANTIES, INCLUDING WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSLY LIMITED TO THE DURATION OF THIS WRITEN WARRANTY. We make no other express warranty, nor is
any one authorizedto make any in our behalf.
Some states do not allow limitations on how longan implied warranty lasts, or the exclusion or limitation of incidental or consequential
damages,
so the above limitation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vayfrom state to state.
TO OBTAIN WARRANTY SERVICE:
Purchaser must bringthe engine to an authorized Kohler service facility. For the facility nearest you, consult your Yellow Pages or write
Kohler Co., Attn: Engine Warranty Service Dept., Kohler, Wisconsin, 53044.
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 530
FEDERALAND CALIFORNIAEMISSION CONTROL SYSTEMS
LIMITED WARRANTY
SMALL OFF-ROADENGINES
The U.S. EnvironmentalProtectionAgency (EPA), the CaliforniaAir Resources Board (CARB), and Kohler Co. are pleasedto explain the Federal
and California Emission Control Systems Warranty on your small off-road equipment engine. For California, engines produced in 1995
and later must be designed, built and equipped to meet the state’s stringent anti-smog standards. In other states, 1997 and later modelyear
engines must be designed, built and equipped, to meet the US. EPA regulations for small non-road engines. The engine must be free from
defects in materials and workmanship which cause it to fail to conformwith US. EPAstandards for the first
two years of engine use from the date
of sale to the ultimate purchaser. Kohler Co. must warrant the emission control system on the engine for the periodof time listedabove, provided
there has been no abuse, neglect or improper maintenance.
The emission control system may include parts such as the catburetor or fuel injectionsystem, the ignition system, and catalytic converter.
Also included are the hoses, belts and connectors and other emission related assemblies.
Where a warrantablecondition exists, Kohler Co. will repair the engine at no cost, including diagnosis (if the diagnostic work is performed at an
authorized dealer), parts and labor.
MANUFACTURERS WARRANTYCOVERAGE
Enginesproducedin 1995or laterare warrantedfor two years in California. In other states, 1997and later modelyear engines are warranted for
two years. If any emission relatedpart on the engine is defective, the part will be repairedor replacedby Kohler Co. free of charge.
0 WNER’S WARRANTY RESPONSIBILITIES
(a) The engine owner is responsible for the performanceof the required maintenance listed in the owner’s manual. Kohler Co. recommends
that you retainall receipts covering maintenance on the engine, but Kohler Co. cannot deny warranty solely for the lack of receiptsor for
your failure to assure that all scheduled maintenance was performed.
Be aware, however, that Kohler Co. may deny warranty coverage if the engine or a part hasfailed due to abuse, neglect, improper
maintenance or unapproved modifications.
(b)
Continuedon nextpage.
17

(c) For warranty repairs, the engine must be presentedto a Kohler Co. setvice center as soon as a problem exists. Call 1-800-544-2444or
access our website at: www.kohlerengines.com, for the names of the nearest setvice centers. The warranty repairs should be completed
in a reasonableamount of time, not to exceed
30 days.
If you have any questions regardingwarranty rights and responsibilities, you should contact Kohler Co. at 1-920-457-4441and ask for an Engine
Service representative.
COVERAGE
Kohler Co. warrantsto the ultimate purchaser and each subsequent purchaserthat the engine will be designed, built and equipped, at the time
of sale, to meet all applicable regulations. Kohler Co. also warrants to the initial purchaser and each subsequent purchaser, that the engine is
free from defects in materials and workmanship which causethe engine to failto conform with applicable regulations for a period of
two years.
Engines produced in 1995or later are warrantedfor
two years in California. For 1997 and later model years, EPA requires manufacturersto
warrant engines for
two years in all other states. These warranty periods will begin on the date the engine is purchased bythe initialpurchaser. If
anyemission related part on the engine is defective, the part will be replaced by Kohler Co. at no cost to the owner. Kohler Co. is liable for
damages to other engine components caused by the failure of a warranted part still under warranty.
Kohler Co. shall remedywarranty defects at any authorized Kohler Co. engine dealer or warranty station. Warranty repair work done at an
authorized dealer or warranty station shall befree of charge to the owner if such work determines that a warranted part is defective.
Listed below are the parts covered by the Federaland California Emission Control Systems Warranty. Some parts listed below may require
scheduled maintenanceand are warranted up to the first scheduled replacement point for that part. The warranted parts are:
Catburetor assembly
Throttle body (EFI Systems)
Catalytic muffler (if equipped)
Fuel meteringvalve (if equipped)
Crankcase breather
Fuel pressure regulator (EFI Systems)
Ignition module(s) with high tension lead
Spark advance module (if equipped)
Oxygen, speed, throttle position, and temperature sensors (if equipped)
Electroniccontrol unit (if equipped)
Fuel injectors (EFI Systems)
Air filter, fuel filter, and spark plugs (onlyto first scheduled replacement point)
LIMITATIONS
This Emission Control Systems Warranty shall not cover any of the following:
(a) repair or replacement required becauseof misuse or neglect, improper maintenance, repairs improperly performed or replacements not
conformingto Kohler Co. specifications that adversely affect performanceand/or durability and alterations or modifications not
recommended or approved in writing by Kohler Co.,
replacementof parts and other services and adjustmentsnecessay for required maintenanceat and after the first scheduled replacement
point,
(b)
(c)
(d)
(e)
MAINTENANCE AND REPAIR REQUIREMENTS
The owner is responsiblefor the proper use and maintenance of the engine. Kohler Co. recommends that all receipts and recordscovetingthe
performance of regular maintenance be retained in case questions arise. If the engine is resold during the warranty period, the maintenance
records should betransferredto each subsequent owner. Kohler Co. reservesthe right to deny warranty coverage if the engine has not been
properly maintained; however, Kohler Co. may not deny warranty repairs solely becauseof the lack of repair maintenance or failure to keep
maintenance records.
consequential damages such as
loss of time, inconvenience, loss of use of the engine or equipment, etc.,
diagnosis and inspection fees that do not result in eligible warranty setvice being performed, and
any add-onor modified part, or malfunction of authorized parts due to the use of add-onor modified parts.
Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or
individual;however,
warrantyrepairs must be performed by a Kohlerauthorized service center. Any replacementpartor servicethat
isequivalent
in performance and durability may be used in non-warranty maintenance or repairs, and shallnot reducethe warranty obligations of the
engine manufacturer.
18

FOR SALESAND SERVICE INFORMATION
IN
US. AND CANADA, CALL
1-800-544-2444
60- 110 RUN'"
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044
I FORM NO.: TP-2474-H
I ISSUED: 12/94 I
REVISED: 12/01
MAILED:
LITHO IN U.S.A.