Kohler Command PRO ECH749 Service Manual

Kohler Command PRO ECH749

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5.38

Section 5

EFI Fuel System

6. ECU

7. Vehicle safety interlocks, ground signal on safety

wire.

Diagnostic Aid #7 FUEL SYSTEM ELECTRICAL

(no fuel delivery)

Possible causes:

1. No fuel

2. Air in high pressure fuel line

3. Fuel valve shut OFF

4. Fuel ﬁ lter/line plugged

5. Injector circuit(s), pin circuits Black 5 and Black 6

6. Injector

7. ECU grounds

8. ECU

9. Li pump not working

Diagnostic Aid #8 FUEL SYSTEM

(fuel pressure)

Possible causes for low fuel system pressure:

1. Low fuel

2. Fuel ﬁ lter plugged

3. Fuel supply line plugged

4. Li fuel pump - insuﬃ cient fuel supply

5. Fuel pump (li or module) - internally plugged

Possible causes for high fuel system pressure:

1. Pressure regulator not functioning properly

inside fuel pump module.

Diagnostic Aid #9 BASIC ENGINE

(cranks but will not run)

Possible causes:

1. Refer to basic engine troubleshooting charts

within service manual sections 3, 5, and 7.

Table of Contents

Other manuals for Kohler Command PRO ECH749

Owner's Manual8 pages

Questions and Answers:

G
Gloria RobinsonAug 26, 2025
Why won't my Kohler Command PRO ECH749 Crankshaft engine crank?
- Q
  quinncurtisAug 26, 2025
  If your Kohler Crankshaft engine won't crank, begin by ensuring the PTO drive is disengaged. A discharged battery is a common culprit; charge or replace it. Also, check if the safety interlock switch is engaged and disengage it. Loose or faulty wires or connections can prevent cranking; secure them. Other potential causes include a faulty key switch or ignition switch (replace if faulty), a faulty electric starter or solenoid (replace if faulty), or seized internal engine components (inspect and repair). A blown fuse, a faulty electronic control unit, or insufficient voltage to the electronic control unit can also prevent the engine from cranking; address these issues as necessary.
B
briandavisAug 29, 2025
What causes a Kohler Crankshaft engine to lose power?
- X
  xmcfarlandAug 30, 2025
  If your Kohler Crankshaft engine is losing power, several factors could be contributing. Begin by checking the crankcase oil level; refill if low or drain if high. A dirty air cleaner element can restrict airflow; clean or replace it. Also, dirt or water in the fuel system can cause power loss; check and replace the fuel if necessary. Excessive engine load can also cause this issue; reduce the load. Other potential causes include an overheated engine (ensure proper cooling), faulty spark plugs (replace them), low compression (perform a compression test and repair), an exhaust restriction (clear any restrictions), a low battery (charge or replace it), or an incorrect governor setting (adjust the setting).
J
Joshua JohnsonSep 1, 2025
What should I do if my Kohler Crankshaft engine overheats?
- T
  Thomas BakerSep 1, 2025
  If your Kohler Crankshaft engine is overheating, several factors could be the cause. Start by checking for clogged air intake/grass screens, cooling fins, oil cooler, or cooling shrouds; clean these components to ensure proper airflow. Excessive engine load can also cause overheating; reduce the load. Check the crankcase oil level; refill if low or drain if high. A lean air-fuel mixture can also contribute to overheating; adjust the air-fuel mixture to the proper levels.
T
trujillojoshuaSep 3, 2025
Why does my Kohler Crankshaft engine run but miss?
- C
  Charles DanielSep 3, 2025
  If your Kohler Crankshaft engine runs but misses, several factors could be responsible. Start by checking for dirt or water in the fuel system; check and replace the fuel as necessary. Ensure the spark plug lead is connected. Poor fuel quality can also cause missing; use proper fuel quality. Other potential causes include faulty spark plugs (replace them), loose wires or connections (secure them), an overheated engine (ensure proper cooling), a faulty ignition module (replace it), an incorrect crankshaft position sensor air gap (adjust it), or insufficient voltage to the electronic control unit (ensure proper voltage supply).
M
Miranda JonesAug 19, 2025
What to do if Kohler Crankshaft operates erratically?

Kohler Command PRO ECH749 Specifications

General

Fuel System	Carburetor
Starter	Electric
Governor Type	Mechanical
Lubrication System	Full Pressure
Fuel Type	Gasoline
Crankshaft Orientation	Horizontal
Bore	3.27 in (83 mm)
Cooling System	Air
Oil Type	SAE 10W-30
Spark Plug Gap	0.030 in (0.76 mm)
Valve Clearance - Intake	0.004 - 0.006 in (0.10 - 0.15 mm)
Crankshaft Type	Varies by model
Crankshaft Thread Size	Varies by model
Crankshaft Length	Varies by model
Crankshaft Diameter	Varies by model
Type	Overhead Valve (OHV)

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