Kohler Command PRO ECH630 User manual

Owner's Manual
Horizontal CranksHaft
ECH630-ECH749

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California
Proposition 65 Warning
Engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects,
or other reproductive harm.

4
Safety Precautions
To ensure safe operation, please read the following
statements and understand their meaning. Also refer
to your equipment manufacturer's manual for other
important safety information. This manual contains
safety precautions which are explained below. Please
read carefully.
WARNING
Warning is used to indicate the presence of a hazard
that can cause severe personal injury, death, or
substantial property damage if the warning is ignored.
CAUTION
Caution is used to indicate the presence of a hazard
that will or can cause minor personal injury or property
damage if the caution is ignored.
NOTE
Note is used to notify people of installation, operation,
or maintenance information that is important but not
hazard-related.
For Your Safety!
These precautions should be followed at all times. Failure to
follow these precautions could result in injury to yourself
and others.
WARNING
Explosive Fuel can cause res
and severe burns.
Do not ll the fuel tank while the
engine is hot or running.
Explosive Fuel!
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.
Do not ll the fuel tank while the engine is hot or running,
since spilled fuel could ignite if it comes in contact with hot
parts or sparks from ignition. Do not start the engine near
spilled fuel. Never use gasoline as a cleaning agent.
WARNING
Accidental Starts can cause severe
injury or death.
Disconnect and ground spark plug
lead(s) before servicing.
Accidental Starts!
Disabling engine. Accidental starting can cause severe injury
or death. Before working on the engine or equipment, disable
the engine as follows: 1) Disconnect the spark plug lead(s).
2) Disconnect negative (-) baery cable from baery.
WARNING
Hot Parts can cause severe burns.
Do not touch engine while operating
or just aer stopping.
Hot Parts!
Engine components can get extremely hot from operation. To
prevent severe burns, do not touch these areas while the engine
is running, or immediately aer it is turned o. Never operate
the engine with heat shields or guards removed.
WARNING
Carbon Monoxide can cause severe
nausea, fainting or death.
Avoid inhaling exhaust fumes, and
never run the engine in a closed
building or conned area.
Lethal Exhaust Gases!
Engine exhaust gases contain poisonous carbon monoxide.
Carbon monoxide is odorless, colorless, and can cause death
if inhaled. Avoid inhaling exhaust fumes, and never run the
engine in a closed building or conned area.
WARNING
Rotating Parts can cause severe
injury.
Stay away while engine is in
operation.
Rotating Parts!
Keep hands, feet, hair, and clothing away from all moving
parts to prevent injury. Never operate the engine with covers,
shrouds, or guards removed.
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.
High Pressure Fluid Puncture!
Fuel system is to be serviced only by properly trained
personnel wearing protective safety equipment. Fluid puncture
injuries are highly toxic and hazardous. If an injury occurs,
seek immediate medical aention.
CAUTION
Electrical Shock can cause injury.
Do not touch wires while engine is
running.
Electrical Shock!
Never touch electrical wires or components while the engine is
running. They can be sources of electrical shock.

5
Symbols Associated With This Product
13
Read
Manual
STOP Stop
Slow
Off
Start
Fuel
On
Fast
Oil
Alert
Run
Congratulations on your purchase of a Kohler Engine. Every part, every component, every system on a
Kohler engine is guided by our exclusive Performance Engineering philosophy:
• To operate on the leading edge of innovation
• To push the boundaries of cleaner, more ecient engines
• To manufacture the highest performing, most reliable engines on the market
You can rest assured that your Kohler Engine will provide maximum power and reliability in all operating
conditions. Also, Kohler engines are backed by a worldwide network of over 10,000 distributors and dealers.
For more information on Kohler Engines or to nd a Kohler Service Center, visit KohlerEngines.com.
To keep your engine in top operating condition, follow the maintenance procedures in this manual.
Oil Recommendations
Using the proper type and weight of oil in the
crankcase is extremely important. So is checking oil
daily and changing oil regularly. Failure to use the
correct oil, or using dirty oil, causes premature engine
wear and failure.
Oil Type
Use high quality detergent oil of API (American
Petroleum Institute) service class SJ or higher. Select
the viscosity based on the air temperature at the
time of operation as shown in the Recommended
Viscosity Grades table.
Recommended Viscosity Grades
°F -20 0 20 32 40 60
50 80 100
°C -30 -20 -10 0 10 20 30 40
5W-30
10W-30
Kohler 10W-30
SAE 30
Fuel Recommendations
WARNING
Explosive Fuel can cause res
and severe burns.
Do not ll the fuel tank while the
engine 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.
Do not ll the fuel tank while the engine is hot or running
since spilled fuel could ignite if it comes in contact with hot
parts or sparks from ignition. Do not start the engine near
spilled fuel. Never use gasoline as a cleaning agent.
General Fuel Recommendations
Purchase gasoline in small quantities and store in
clean, approved containers. Use a container with a
capacity of two gallons or less with a pouring spout
is recommended, as it is easier to handle and helps
eliminate spillage during refueling. To minimize gum
deposits in fuel system, do not use gasoline le over
from previous season. Do not add oil to the gasoline.
Do not overll the fuel tank. Leave room for the fuel
to expand.
Fuel Type
For best results use only clean, fresh, unleaded
gasoline with a pump sticker octane rating of 87
(R+M)/2 or higher. In countries using the Research
Octane Number (RON), it should be 90 octane
minimum. Leaded gasoline is not recommended and
must not be used on EFI engines or on other models
where exhaust emissions are regulated.

6
Gasoline/Alcohol blends
Gasohol (up to 10% ethyl alcohol, 90% unleaded
gasoline by volume) is approved as a fuel for Kohler
engines. Other gasoline/alcohol blends including E20
and E85 are not to be used and not approved. Any
failures resulting from use of these fuels will not be
warranted.
Gasoline/Ether blends
Methyl Tertiary Butyl Ether (MTBE) and unleaded
gasoline blends (up to a maximum of 15% MTBE by
volume) are approved as a fuel for Kohler engines.
Other gasoline/ether blends are not approved.
Operating Instructions
Also read the instructions of equipment this engine powers.
Check Oil Level
See Figures 1, 2, and 3
The importance of checking and maintaining
the 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 cool
so the oil has had time to drain into the sump.
2. Clean the area around the dipstick (D) to keep
dirt and debris out of the engine. See Figure 1.
3. Remove the dipstick (D); wipe o oil.
4. Reinsert the dipstick (D). Push or screw on the
dipstick in all the way.
5. Remove dipstick (D) again and check oil level. Oil
should be up to, but not over F or FULL mark (B)
on dipstick. See Figure 2.
6. If oil level is low, add the correct type of oil up to
the F or FULL mark (B) on dipstick. Remove the
ll cap (A) or the dipstick (C) to ll the crankcase
with new oil of the proper type. Recheck oil level
before adding more oil. Always check the oil level
with the dipstick before adding more. See Figures
2 and 3.
7. Reinstall the oil ll cap and dipstick securely.
NOTE: To prevent extensive engine wear or damage,
always maintain proper oil level in crankcase.
Never operate engine with oil level below the
L or LOW mark (C), or over the F or FULL
mark (B) on dipstick. See Figure 2.
Check Cooling Areas
See Figure 1
To ensure proper cooling, make sure the xed
guard (G), oil cooler (some models) (H), and other
external surfaces of the engine are kept clean at all
times.
Check Air Cleaner
See Figure 1
This engine is equipped with heavy-duty (shown)
air cleaner, at style air cleaner, or special air cleaner
supplied by the equipment manufacturer.
Check the air cleaner (A) daily or before starting the
engine for a buildup of dirt and debris. Keep the area
in and around the air cleaner clean. Also check for
loose or damaged components. Replace all worn or
damaged air cleaner components.
NOTE: Operating engine with loose or damaged air
cleaner components could allow unltered
air into engine, causing premature wear and
failure.
Pre-Start Checklist
1. Check oil level; if low add oil. Do not overll.
NOTE: Engines are shipped without oil. Do not start
engine with low or no oil. This will cause
damage to the engine and will not be covered
under warranty.
2. Check fuel level; if low add fuel. Do not overll.
3. Check cooling areas, air intake areas, and external
surfaces of engine. Make sure they are clean and
unobstructed.
4. Check that the air cleaner components and all
shrouds, equipment covers, and guards are in
place and securely fastened.
5. Check that any clutches or transmissions are
disengaged or placed in neutral. This is especially
important on equipment with hydrostatic drive.
The shi lever must be in neutral to prevent
resistance which could keep the engine from
starting.
Starting
WARNING
Carbon Monoxide can cause severe
nausea, fainting or death.
Avoid inhaling exhaust fumes, and
never run the engine in a closed
building or conned area.
Engine exhaust gases contain poisonous carbon monoxide.
Carbon monoxide is odorless, colorless, and can cause death
if inhaled. Avoid inhaling exhaust fumes, and never run the
engine in a closed building or conned area.
1. Place the throle control midway between the
SLOW and FAST positions.
2. Start the engine by activating the key switch.
Release the switch as soon as the engine starts.

7
NOTE: Do not crank the engine continuously for
more than 10 seconds at a time. If the engine
does not start, allow a 60 second cool down
period between starting aempts. Failure
to follow these guidelines can damage the
starter motor.
NOTE: Upon start-up, a metallic ticking may occur.
This is caused by hydraulic lier leakdown
during storage. The noise will normally cease
in the rst minute. If noise continues, run
the engine at mid-throle for 20 minutes. If
noise persists, take the engine to your Kohler
Engine Service Center.
NOTE: If the starter cranks the engine but does not
start the engine, the engine rotation must be
allowed to come to a complete stop before
aempting to restart the engine. If the starter
is engaged while the ywheel is rotating, the
starter pinion and ywheel ring gear may
clash, resulting in damage to the starter.
If the starter does not turn the engine over, shut o
starter immediately. Do not make further aempts to
start the engine until the condition is corrected. Do
not jump start using another baery. Refer to Battery.
See your Kohler Engine Service Center for service
assistance.
Stopping
1. Remove the load by disengaging all PTO driven
aachments.
2. Move the throle to the slow or idle position;
turn key OFF to stop engine.
Battery
A 12 volt baery is used. Refer to the operating
instructions of the equipment this engine powers for
specic baery requirements.
If the baery charge is not sucient to crank the
engine, recharge the baery. Follow the baery
manufacturer's instructions.
Operating
Angle of Operation
This engine will operate continuously at angles up to
25° in all directions for one minute or less. Oil level
must be at F or FULL mark on dipstick.
Refer to the operating instructions of the equipment
this engine powers. Due to equipment design or
application, there may be more stringent restrictions
regarding the angle of operation.
NOTE: Do not operate this engine continuously
at angles exceeding 25° in any direction,
because engine damage could result from
insucient lubrication.
Cooling
See Figure 1
WARNING
Hot Parts can cause severe burns.
Do not touch engine while operating
or just aer stopping.
Engine components can get extremely hot from operation. To
prevent severe burns, do not touch these areas while the engine
is running, or immediately aer it is turned o. Never operate
the engine with heat shields or guards removed.
To ensure proper cooling, make sure the xed guard
(G), oil cooler (H) (some models), and other external
surfaces of the engine are kept clean at all times.
NOTE: If debris builds up on the xed guard (G), oil
cooler (H) (some models), or other cooling
areas, stop the engine immediately and
clean. Operating the engine with blocked or
dirty air intake and cooling areas can cause
extensive damage due to overheating. Refer
to Clean Air Intake/Cooling Areas.
Engine Speed
NOTE: Do not tamper with the governor seing
to increase the maximum engine speed.
Overspeed is hazardous and will void the
engine warranty. The maximum allowable
high idle speed no load for these engines
is 4200 RPM.
Oil Sentry™
Some engines are equipped with an optional Oil
Sentry™ switch. This switch is designed to prevent
the engine from starting in a low oil or no oil
condition. The Oil Sentry™ may not shut down
a running engine before damage occurs. In some
applications this switch may activate a warning signal.
Read your equipment manuals for more information.
NOTE: Make sure the oil level is checked BEFORE
EACH USE and is maintained up to the F
or Full mark on the dipstick. This includes
engines equipped with Oil Sentry™.

8
Maintenance Instructions
Normal maintenance, replacement or repair of emission control devices and systems may be performed by any
repair establishment or individual; however, warranty repairs must be performed by a Kohler authorized
service center.
WARNING
Accidental Starts can cause severe
injury or death.
Disconnect and ground spark plug
lead(s) before servicing.
Disabling engine. Accidental starting can cause severe injury or death. Before working on the engine or equipment, disable the
engine as follows: 1) Disconnect the spark plug lead(s). 2) Disconnect negative (-) baery cable from baery.
Maintenance Schedule
These required maintenance procedures should be performed at the frequency stated in the table below. They
should also be included as part of any seasonal tune-up
Frequency Maintenance Required
Daily or
Before Starting Engine
Check oil level.
Fill fuel tank.
Check air intake and cooling areas; clean as necessary.¹
Check air cleaner for dirty¹, loose, or damaged parts.
Every 25 Hours Clean or replace precleaner (if equipped) clean as necessary.¹,³
Every 100 Hours
Change oil (more frequently under severe conditions).
Replace element¹ (low-prole air cleaner models).
Remove and clean shrouds and cooling areas.¹
Check oil cooler ns, clean as necessary (if equipped).
Weekly or Every
150 Hours
Check lter minder.4
Inspect air lter paper element and inlet screen area.4
Every 200 Hours
Replace fuel lter.¹
Change oil lter.
Clean, set gap or replace spark plug, and set gap.
Annually or Every 300 Hours Replace heavy-duty air cleaner element and check inner element.¹
Annually or Every 500 Hours Have starter serviced.²
¹Perform these maintenance procedures more frequently under extremely dusty, dirty conditions.
²Have a Kohler Engine Service Dealer perform this service.
3
Low-prole air cleaner.
4
Heavy-duty air cleaner.
Oil Disposal
Protect and respect the environment. Dispose of oil
at your local recycling center or municipal collection
center in accordance with local ordinances.
Change Oil
See Figures 1, 2, 3, and 4
Change oil aer every 100 hours of operation (more
frequently under severe conditions). Rell with oil as
specied in the Recommended Viscosity Grades
table.
Change the oil while the engine is still warm. The oil
will ow more freely and carry away more impurities.
Make sure the engine is level when lling, checking,
or changing the oil.
1. To keep dirt, debris, etc., out of the engine, clean
the area around the dipstick (D); remove the
dipstick. See Figure 1.
2. Remove the oil drain plug on the starter side (A)
or the drain plug oil lter side (B). Allow ample
time for complete drainage. See Figure 4.
3. Reinstall the drain plug (A or B) and torque to
13.6 N·m (10 . lb.). See Figure 4.

9
4. Remove the ll cap (A) or use the dipstick ll
tube (D) to ll the crankcase with new oil of the
proper type to the F or FULL mark (B) on the
dipstick. Recheck oil level before adding more oil.
See Figures 2 and 3.
5. Reinstall the oil ll cap and dipstick securely.
Change Oil Filter
See Figures 1, 2, 3, 4, and 5
Replace the oil lter at least every other oil change
(every 200 hours of operation). Always use a genuine
Kohler oil lter. Replace the oil lter as follows:
1. To keep dirt, debris, etc., out of the engine, clean
the area around the dipstick (D); remove the
dipstick. See Figure 1.
2. Remove the oil drain plug on the starter side (A)
or the drain plug oil lter side (B). Allow ample
time for complete drainage. See Figure 4.
3. Reinstall the drain plug (A or B) and torque to
13.6 N·m (10 . lb.). See Figure 4.
4. To keep dirt, debris, etc., out of the engine, clean
the area around the oil lter (A); remove the oil
lter. See Figure 5.
5. Wipe the surface where the oil lter mounts.
6. Place a new replacement lter in a shallow pan
with the open end up. Pour new oil, of the proper
type, in through the threaded center hole. Stop
pouring when the oil reaches the boom of the
threads. Allow a minute or two for the oil to be
absorbed by the lter material.
7. Apply a thin lm of clean oil to the rubber gasket
on the new lter.
8. Install the new oil lter to the lter adapter or oil
cooler. Refer to instructions on the oil lter for
proper installation.
9. Remove the ll cap (A) or use the dipstick ll
tube (D) to ll the crankcase with new oil of the
proper type to the F or FULL mark (B) on the
dipstick. Recheck oil level before adding more oil.
(Refer to Check Oil Level.) See Figures 2 and 3.
10. Reinstall the oil ll cap and dipstick securely
11. Test run the engine to check for leaks. Stop the
engine, allow a minute for the oil to drain down,
and recheck the level on the dipstick. Verify
the oil level is up to but not over the F or FULL
mark (B) on the dipstick. See Figure 2.
Service Oil Cooler (If Equipped)
See Figure 5
Some engines are equipped with an optional oil
cooler. Inspect and clean oil cooler every 100 hours of
operation (more frequently under severe conditions).
Oil cooler must be kept free of debris. Service the oil
cooler as follows:
1. Remove the hardware (B), holding the oil cooler
(C) to the blower housing (D).
2. Clean the inside of the cooler with a brush.
3. Reinstall the oil cooler (C) to the blower housing
(D) securing with the mounting hardware (B).
Air Cleaner Service
Heavy-Duty Air Cleaner
See Figures 1, 6, and 7
Weekly and every 150 hours: Check lter minder (F)
(if equipped), perform inspection of the paper element
(B) and inlet screen (G) area. See Figure 6.
Annually or every 300 hours of operation (more oen
under extremely dusty or dirty conditions), replace
the paper element and check the inner element.
Follow these steps.
Do not wash the paper element and inner element or
use compressed air, this will damage the elements.
Replace dirty, bent or damaged elements with new
genuine Kohler elements as required. Handle the new
elements carefully; do not use if the sealing surfaces
are bent or damaged.
1. Unhook the two retaining clips (B) on each end
and remove the end caps from the air cleaner
housing (D). See Figures 1 and 6.
2. Check and clean the inlet screen (G) using a
brush. See Figure 6.
3. Remove and inspect the air cleaner outer
element (B). Replace if it appears dirty or is at the
annually or 300 hour interval. See Figure 6.
4. Remove and inspect the air cleaner inner
element (C). Replace if it appears dirty or is at the
600 hour interval. See Figure 6.
5. Clean the area around the base of the inner
element before removing it, so dirt does not get
into the engine. See Figure 6.
6. Check all parts for wear, cracks, or damage, and
make sure ejector area (B) is clean. Replace any
damaged components. See Figure 7.
7. Install elements (B and C) and covers (A and E) in
reverse order of removal. See Figure 6.
8. Secure covers with clips (B). See Figure 1.

10
Low-Prole Air Cleaner
See Figure 8
Every two months or every 25 hours of operation
wash or replace the precleaner (F). Wash precleaner
in warm water and detergent. Rinse the precleaner
thoroughly and squeeze out excess water (do not
wring). Allow precleaner to air dry.
Replace the air cleaner element (G) every 100 hours
or annually. Do not wash the air cleaner inner
element or use compressed air, this will damage the
elements. Replace dirty, bent or damaged elements
with new genuine Kohler elements as required.
Handle the new air cleaner elements carefully; do not
use if the sealing surfaces are bent or damaged.
1. Loosen the cover retaining knob (A) and remove
cover (B).
2. Remove and inspect the precleaner (F) wash or
replace as necessary.
3. Clean area around the air cleaner element (G) to
prevent dirt and debris from entering the engine.
4. Remove the element cover wing nut (C) and
element cover (D).
5. Remove and inspect the air cleaner element (G)
replace as necessary.
6. Check the condition of the rubber seal (E) on the
air cleaner stud (I). Replace if the seal is worn,
damaged, or questionable.
7. Reinstall the components in reverse order of
removal.
Clean Air Intake/Cooling Areas
See Figure 1
To ensure proper cooling, make sure the xed
guard (G), cooling ns, and other external surfaces of
the engine are kept clean at all times.
Every 100 hours of operation (more oen under
extremely dusty, dirty conditions), remove the
blower housing and other cooling shrouds (L). Clean
the cooling ns and external surfaces as necessary.
Reinstall the blower housing and other cooling
shrouds.
NOTE: Operating the engine with a blocked xed
guard, dirty or plugged cooling ns, and/or
cooling shrouds removed, will cause engine
damage due to overheating.
Ignition
EFI Engines incorporate a computer-controlled
baery ignition system with individual coils. Other
than periodically checking/replacing the spark plugs,
no maintenance, timing, or adjustments are necessary
or possible with this system.
Spark Plug
See Figures 1 and 9
Every 200 hours of operation, remove the spark plugs,
check condition, and reset the gap or replace with
new plugs as necessary. The standard spark plug is a
Champion® RC12YC (Kohler Part No. 12 132 02-S). RFI
compliant engines use a Champion® XC12YC (Kohler
Part No. 25 132 14-S) spark plug. A high-performance
spark plug, Champion® Platinum 3071 (used on Pro
Series engines, Kohler Part No. 25 132 12-S) is also
available. Equivalent alternate brand plugs can also be
used.
1. Before removing the spark plugs (E), clean the
area around the base of the plug to keep dirt and
debris out of the engine. See Figure 1.
2. Remove the plugs (E) and check its condition.
Replace the plugs if worn or reuse is
questionable. See Figure 1.
NOTE: Do not clean the spark plug in using abrasive
grit. Some grit could remain in the spark plug
and enter the engine, causing extensive wear
and damage.
3. Check the gap (D) using a wire feeler gauge (A).
Adjust the gap to 0.76 mm (0.030 in.) by carefully
bending the ground electrode (C). See Figure 9.
4. Reinstall the spark plug (E) into the cylinder
head. Torque the spark plugs to 24.4-29.8 N·m
(18-22 . lb.). See Figure 1.
Battery Charging
Follow all the baery warnings and safety guidelines
and procedures provided by the baery manufacturer
and equipment manufacturer.
Jump Starting
Follow all safety guidelines and procedures provided
by the baery manufacturer and/or original
equipment manufacturer (OEM). Failure to follow
proper procedures may result in serious personal
injury and/or non-warrantable damage to the engine's
Electronic Fuel Injection (EFI) components.
Fuel System
See Figure 1
WARNING
High Pressure Fluids can puncture
skin and cause severe injury or
death.
Do not work on fuel system
without proper training and safety
equipment.

11
General
The precision components inside the fuel pump
module are not serviceable. DO NOT aempt to open
the fuel pump module. Damage to the components
will result and the warranty will be void. Because the
fuel pump module is not serviceable, the engines are
equipped with a special 10-micron EFI fuel lter (J)
to prevent harmful contamination from entering the
module.
If there are two lters in the system, the one before
the li pump will be a standard 51-75 micron lter,
and the one aer the li pump will be the special
10-micron lter. Be sure to use an approved 10-micron
lter for replacement.
Service
Periodically inspect the lter and replace every 200
operating hours or more frequently under extremely
dusty or dirty conditions. Use only a genuine Kohler
lter (Kohler Part No. 25 050 42-S) and install it
according to the directional arrows. Failure to use the
proper lter can result in engine damage and void the
warranty.
Fuel Line
These engines use low permeation rated fuel lines,
certied to comply with California and U.S. EPA
evaporative emission requirements. Fuel lines that do
not meet these requirements may not be used. Order
replacement hose through a Kohler Service Center.
A high pressure fuel line runs between the high
pressure pump and the injectors. This special fuel
line, capable of withstanding the high pressure of the
EFI fuel system meets SAE R9 specications. If fuel
line must be replaced, see your Kohler Engine Service
Center.
Electronic Fuel Injection (EFI) System
The EFI system is a complete, electronically-
controlled, fuel management system, designed to
deliver a precisely controlled fuel ow under all
operating conditions. The electronic control unit
(ECU), the brain of the system, automatically adjusts
fuel delivery and ignition timing based upon load,
speed, operating temperature, and exhaust emission
levels. The low idle speed is the only manual
adjustment possible. The ECU continuously monitors
operation of the EFI system. If it detects a problem
or fault within the system, it will illuminate the
Malfunction Indicator Light (MIL) (if so equipped).
This is a signal that normal, programmed operation
has been aected, and service by an authorized Kohler
Engine Service Center is required. In most cases a MIL
light may be added to an engine, see Parts Ordering.
Troubleshooting
If the MIL comes on, or the engine becomes hard to
start, runs roughly, or stalls at low idle speed, initial
checks should be made in the following areas:
• Check that the fuel tank is lled with clean, fresh
gasoline, and shut-o valve (if so equipped) is
opened completely.
• Check that the fuel tank vent cap is not blocked
and it is operating properly (non-California
models).
• Check that the air cleaner element and precleaner
are clean and all components are properly
secured. Clean or replace as necessary.
• Check that the proper fuel lter is being used,
and it is clean and unobstructed. Replace lter(s)
only with genuine Kohler parts.
• Check that all connections to sensors, ECU, and
fuel injectors are properly secured.
• Check that there is 12 volt baery is being used
and is fully charged.
• Check that fuses are not burned out. If so then
replace.
If these checks do not correct the problem, or the MIL
remains on, further diagnosis and servicing by an
authorized Kohler Engine Center is necessary.
Adjustment – Throttle Body
See Figure 10
Low Idle Speed (RPM) is the only adjustment that
can be made. All other fuel calibrations are controlled
by the ECU. The standard low idle speed is 1500 RPM
(± 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 ECU will
briey set a higher (200-400 RPM) low idle speed,
similar to a fast idle. Do not aempt to perform any
readjustment during this warm-up period.
If adjustment is to be made, the engine must be at
operating temperature, air cleaner in place, and check
engine light must be o (no fault codes present).
1. Start the engine and run at half throle for 5 to 10
minutes to warm up.
2. Place the throle control into the idle or slow
position.

12
Troubleshooting
When troubles occur, be sure to check the simple causes which, at rst, may seem too obvious to be considered.
For example, a starting problem could be caused by an empty fuel tank. Some common causes of engine troubles
are listed in the following table.
Do not aempt to service or replace major engine components, or any items that require special timing or
adjustment procedures. Have your Kohler Engine Service Center do this work.
Possible Cause
Problem No
Fuel
Improper
Fuel
Blocked
Fuel Line/
System
Low
Battery
Voltage
Broken
Fusible
Link
Dirty
Fixed
Guard
Incorrect
Oil Level
Engine
Overloaded
Dirty Air
Cleaner
Faulty
Spark
Plug
Will Not Start
Hard Starting
Stops Suddenly
Lacks Power
Operates
Erratically
Knocks or Pings
Skips or Misres
Backres
Overheats
High Fuel
Consumption
3. Turn the low idle speed adjusting screw (A) in or
out and check RPM with a tachometer.
Fuse Replacement
See Figure 11 and 12
This engine has three (3) blade type automotive fuses.
Replacement fuses must have the same rating as the
blown fuse. Use the fuse chart below to determine the
correct fuse. See Figure 14.
Wire Color Fuse Rating
2 Purple Wires 30-amp Fuse
1 Red Wire with Black Stripe
1 Red Wire with White Stripe 10-amp Fuse
2 Red Wires 10-amp Fuse
Figure 14. Fuse Rating Chart.
To replace a fuse:
1. Shut engine o and remove key.
2. Locate the fuse holders (A). See Figure 11.
3. Remove the fuse cover (B) and pull out fuse. See
Figure 11.
4. Inspect the fuse for a solid fusible link (A) or a
broken fusible link (B). Replace the fuse if the
fusible link is broken (B). If you are not sure if the
fusible link is broken, replace the fuse. See Figure
12.
5. Insert the fuse into the fuse holder (A) until it
is seated properly. Install the fuse cover (B). See
Figure 11.
Additional Electrical Information
The yellow accessory wire on the original Kohler
Engine key switch can not draw more than 2-amps.
A relay may be used in order to use a higher drawing
accessory. Contact a Kohler Engines application
specialist for further instructions. A current draw of
more than 2-amps will cause damage to the ECU, Fuel
Pump Module, or other electrical system components
and will void the warranty.

13
Storage
See Figure 1
If the engine will be out of service for two months or
more, follow these storage procedures:
1. Clean the exterior surfaces of the engine. Avoid
spraying water at the wiring harness or any of the
electrical components.
2. Change the oil and lter while the engine is still
warm from operation. Refer to Change Oil and
Filter.
3. The fuel system must be completely emptied,
or the gasoline must be treated with a fuel
stabilizer to prevent deterioration. If you choose
to use a fuel stabilizer, follow the manufacturers
recommendations, and add the correct amount
for the capacity of the fuel system.
4. Fill the fuel tank with clean, fresh gasoline.
Run the engine for 2-3 minutes to get stabilized
fuel into the fuel system. Close fuel shut o
valve (if equipped) when unit is being stored or
transported. To empty the system, run the engine
until the tank and fuel system are empty.
5. Remove the spark plugs. Add one tablespoon of
engine oil into each spark plug hole. Install plugs,
but do not connect the plug leads. Crank the
engine two or three revolutions.
6. Disconnect the negative (-) baery cable or use a
Baery Minder trickle charger while the unit is in
storage.
7. Store the engine in a clean, dry place.
Repairs
Repair information is available in Kohler Engine
service manuals which are available at
KohlerEngines.com, or at Kohler Service Centers.
Major repairs generally require the services of a
trained mechanic and the use of specialized tools and
equipment. Kohler Service Centers have the facilities,
training, and genuine Kohler replacement parts
necessary to perform these services.
For the nearest sales and service location, visit our
Web site at KohlerEngines.com, or in the U.S. and
Canada call 1-800-544-2444.
Parts Ordering
The engine model, specication, and serial numbers
are required when ordering replacement parts from
your Kohler Service Center. These numbers are found
on the identication plate which is axed to the
engine shrouding. Include leer suxes if there are
any. Refer to Engine Identication Numbers.
Always insist on genuine Kohler replacement parts, as
they adhere to strict standards for t, reliability, and
performance. Visit KohlerEngines.com or your Kohler
Service Center.
Engine Identication
Engine Identication Numbers
See Figure 1
Engine identication numbers will appear on the
engine data tag (M). See Figure 1.
When ordering parts, or in any communication
concerning this engine, always give the model name,
specication number, and serial number — including
any leer suxes.
Emission Compliance
The Emission Compliance Period referred to on the
Emission Control or Air Index label indicates the
number of operating hours for which the engine has
been shown to meet Federal and CARB emission
requirements. The following table provides the
Engine Compliance Period (in hours) associated with
the category descriptor which may be found on the
certication label.
Emission Compliance Period
EPA Category A:1000 hours
CARB Extended:500 hour
Refer to certication label for engine displacement.
Exhaust Emission Control System for models ECH630,
ECH650, ECH680, ECH730, ECH740, ECH749 is EM,
O2S, ECM, MPI for U.S. EPA, California, and Europe.

14
LIMITED 3 YEAR COMMAND ENGINE WARRANTY
Kohler Co. warrants to the original consumer that each new COMMAND engine sold by Kohler Co. will be free from manufacturing
defects in materials or workmanship in normal service for a period of three (3) years from date of purchase, provided it is operated and
maintained in accordance with 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 parts as inspection shall disclose to have been defective.
EXCLUSIONS:
Muers on engines used commercially (non-residential) are warranted for one (1) year from date of purchase, except catalytic muers,
which are warranted for three (3) years.
This warranty does not apply to defects caused by casualty or unreasonable use, including faulty repairs by others and failure to provide
reasonable and necessary maintenance.
The following items are not covered by this warranty:
Engine accessories such as fuel tanks, clutches, transmissions, power-drive assemblies, and baeries, unless supplied or installed by
Kohler Co. These are subject to the warranties, if any, of their manufacturers.
KOHLER CO. AND/OR THE SELLER SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES OF ANY KIND, including but not limited to labor costs or transportation charges in connection with the repair or replacement
of defective parts.
IMPLIED OR STATUTORY WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSLY LIMITED TO THE DURATION OF THIS WRITTEN WARRANTY. We make no other express warranty, nor
is any one authorized to make any on our behalf.
Some states do not allow limitations on how long an 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 specic legal rights, and you may also have other rights, which vary from state to state.
TO OBTAIN WARRANTY SERVICE:
Purchaser must bring the engine to an authorized Kohler service facility. To locate the nearest facility, visit our website,
www.KohlerEngines.com, and click on SERVICE and DEALER LOCATOR to use the locator function, consult your Yellow Pages or
telephone [phone].
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044
Specications
Model: ECH630 ECH650 ECH680 ECH730 ECH740 ECH749
Bore: mm
(in.)
80
(3.2)
83
(3.3)
Stroke: mm
(in.)
69
(2.72)
69
(2.72)
Displacement: cm3
(in.3)
694
(42.4)
694
(42.4)
694
(42.4)
747
(45.6)
747
(45.6)
747
(45.6)
*Gross Power
(@ 3600 RPM):
kW
(HP)
14.1
(19)*
15.7
(21)*
17.2
(23)*
18.6
(25)*
20.1
(27)*
21.6
(29)*
Net Power
(@ 3600 RPM):
kW
(HP)
13.8**
(18.6)**
14.6**
(19.6)**
15.4**
(20.7)**
16.2
(21.7)
17.4
(23.3)
17.9
(24.0)
Peak Torque (Minimum): N·m
(ft. lb.)
42.8**
(31.6)**
44.3**
(32.7)**
46.8**
(34.5)**
49.1
(36.2)
50.7
(37.4)
50.8
(37.5)
Compression Ratio: 8.8:1 9.1:1
Weight: kg
(lbs.)
46
(102)
Oil Capacity: L
(U.S. qt.)
1.9
(2)
1.9
(2)
Exhaust Emission Control System: EM, O2S, ECM, MPI for U.S. EPA, California, and Europe
*Horsepower ratings exceed Society of Automotive Engineers Small Engine Test Code J1940. Actual engine
horsepower is lower and aected by, but not limited to, accessories (air cleaner, exhaust, charging, cooling, fuel
pump, etc.), application, engine speed and ambient operating conditions (temperature, humidity, and altitude).
Kohler reserves the right to change product specications, designs, and equipment without notice and without
incurring obligation
**Based on preliminary information.

15
KOHLER CO.
FEDERAL AND CALIFORNIA EMISSION CONTROL SYSTEMS
LIMITED WARRANTY
SMALL OFF-ROAD AND CLASS 1 LSI ENGINES
The U.S. Environmental Protection Agency (EPA), the California Air Resources Board (CARB), and Kohler Co. are pleased to explain the
2011 and later Federal and California Emission Control Systems Warranty on your o-road equipment engine. “Emissions“ means both
exhaust and evaporative emissions. For California, small o-road engines, and Class 1 LSI (Large Spark Ignited engines at or below 1.0
liter) must be designed, built and equipped to meet the state’s stringent anti-smog standards. In other states, engines must be designed,
built and equipped, to meet the U.S. EPA regulations for small non-road engines. The engine must be free from defects in materials and
workmanship which cause it to fail to conform with U.S. EPA standards for the rst three 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 period of time listed above, provided there
has been no abuse, neglect or improper maintenance.
The emission control system may include parts such as the carburetor or fuel injection system, the ignition system, and catalytic converter.
Also included are the hoses, belts and connectors and other emission related assemblies.
Where a warrantable condition 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.
MANUFACTURER’S WARRANTY COVERAGE
Small o-road engines and Class 1 LSI engines are warranted for three years in California and other states. If any emission related part on
the engine is defective, the part will be repaired or replaced by Kohler Co. free of charge.
OWNER’S WARRANTY RESPONSIBILITIES
(a) The engine owner is responsible for the performance of the required maintenance listed in the owner’s manual. Kohler Co.
recommends that you retain all receipts covering maintenance on the engine, but Kohler Co. cannot deny warranty solely for the
lack of receipts or for your failure to assure that all scheduled maintenance was performed.
(b) Be aware, however, that Kohler Co. may deny warranty coverage if the engine or a part has failed due to abuse, neglect, improper
maintenance or unapproved modications.
(c) For warranty repairs, the engine must be presented to a Kohler Co. service center as soon as a problem exists. Call 1-800-544-2444
or access our web site at: www.kohlerengines.com, for the names of the nearest service centers. The warranty repairs should be
completed in a reasonable amount of time, not to exceed 30 days.
If you have any questions regarding warranty rights and responsibilities, you should contact Kohler Co. at 1-920-457-4441 and ask for an
Engine Service representative.
COVERAGE
Kohler Co. warrants to the ultimate purchaser and each subsequent purchaser that 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 cause the engine to fail to conform with applicable regulations for a period
of three years.
Small o-road engines and Class 1 LSI engines are warranted for three years in California. EPA requires manufacturers to warrant engines
for three years in all other states. These warranty periods will begin on the date the engine is purchased by the initial purchaser. If any
emission 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 remedy warranty defects at any authorized Kohler Co. engine dealer or warranty station. Warranty repair work done at an
authorized dealer or warranty station shall be free of charge to the owner if such work determines that a warranted part is defective.
Continued on next page.

FORM NO.: 24 590 16 Rev. A
ISSUED: 10/10
REVISED: 11/10
FOR SALES AND SERVICE INFORMATION
IN U.S. AND CANADA, CALL 1-800-544-2444
KohlerEngines.com
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044
© 2010 by Kohler Co. All rights reserved.
Listed below are the parts covered by the Federal and California Emission Control Systems Warranty. Some parts listed below may require
scheduled maintenance and are warranted up to the rst scheduled replacement point for that part. The warranted parts include the
following if they were present in the engine purchased:
• Oxygen sensor (if equipped) • Ignition module(s) with high tension lead
• Intake manifold (if equipped) • Gaseous fuel regulator (if equipped)
• Exhaust manifold (if equipped) • Electronic control unit (if equipped)
• Catalytic muer (if equipped) • Carburetor or fuel injection system
• Thermal reactor muer (if equipped) • Fuel metering valve (if equipped)
• Fuel lines, fuel line ings and clamps (if equipped) • Air lter, fuel lter, and spark plugs (only
• Spark advance module (if equipped) to rst scheduled replacement point)
• Crankcase breather • Evaporative System (if equipped)
• Air Injection System (if equipped) - Canister (if equipped)
- Air pump or pulse valve assembly (if equipped) - Canister lter (if equipped)
- Control/distribution valve (if equipped) - Vapor hose (if equipped)
- Distribution manifold (if equipped) - Orice connector (if equipped)
- Air hoses (if equipped) - Fuel tank (if equipped)
- Vacuum lines (if equipped) - Fuel cap (if equipped)
- Primer bulb canister (if equipped)
LIMITATIONS
This Emission Control Systems Warranty shall not cover any of the following:
(a) repair or replacement required because of misuse or neglect, improper maintenance, repairs improperly performed or replacements
not conforming to Kohler Co. specications that adversely aect performance and/or durability and alterations or modications not
recommended or approved in writing by Kohler Co.,
(b) replacement of parts and other services and adjustments necessary for required maintenance at and aer the rst scheduled
replacement point,
(c) consequential damages such as loss of time, inconvenience, loss of use of the engine or equipment, etc.,
(d) diagnosis and inspection fees that do not result in eligible warranty service being performed, and
(e) any add-on or modied part, or malfunction of authorized parts due to the use of add-on or modied parts.
MAINTENANCE AND REPAIR REQUIREMENTS
The owner is responsible for the proper use and maintenance of the engine. Kohler Co. recommends that all receipts and records covering
the performance of regular maintenance be retained in case questions arise. If the engine is resold during the warranty period, the
maintenance records should be transferred to each subsequent owner. Kohler Co. reserves the right to deny warranty coverage if the engine
has not been properly maintained; however, Kohler Co. may not deny warranty repairs solely because of the lack of repair maintenance or
failure to keep maintenance records.
Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or
individual; however, warranty repairs must be performed by a Kohler authorized service center. Any replacement part or service that
is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty
obligations of the engine manufacturer.