Cub Cadet CC4165 6

MAINTENANCE AND REPAIR INSTRUCTIONS

If, after checking the fuel and cleaning the air filter, the engine still will not idle, adjust the idle speed screw as follows:

1.Start the engine and let it run at a high idle for a minute to

warm up. Refer to Starting/Stopping Instructions.

2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small phillips or flat blade screwdriver into the hole in the air filter/muffler cover (Fig. 32). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.

3.If the engine appears to be idling too fast, turn the idle speed

screw counterclockwise 1/8 of a turn at a time (as needed),		Fig. 29
screw counterclockwise 1/8 of a turn at a time (as needed),		Fig. 29
to reduce idle speed.
to reduce idle speed.	Back Plate
Checking the fuel, cleaning the air filter, and adjusting the idle	Back Plate


speed should solve most engine problems. If not and all of the			Slots
following are true:			Slots
following are true:

• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
ROCKER ARM CLEARANCE
WARNING: To avoid serious personal injury,	Fig. 30
always turn the unit off and allow it to cool	Air Filter Cover

2.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.

3.Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm.) using a feeler gauge (Fig. 38).

4.Install a correctly-gapped spark plug in the cylinder head. Turn the 5/8 in. socket clockwise until snug.

If using a torque wrench torque to:

110-120 in.•lb. (12.3-13.5 N•m)

Do not over tighten.

SPARK ARRESTOR MAINTENANCE

1.Remove the muffler cover. See Rocker Arm Clearance.

2.With a flat blade screwdriver or Torx T-20 bit and a T-25 bit, remove the screws attaching the spark arrestor diverter to the muffler (Fig. 39).

3.Pull the tab on the spark arrestor cover out of the muffler. Remove the spark arrestor cover.

4.Remove the spark arrestor screen from the spark arrestor cover.

5.Clean the spark arrestor screen with a wire brush or replace it.

6.Reinstall the spark arrestor screen, spark arrestor cover and screw.

CLEANING

0.025 in.

(0.635 mm.)

	Fig. 38
Muffler	Spark Arrestor
	Spark Arrestor
	Screen
	Diverter

T-25

Screw

Slot	T-20 Screw
	T-20 Screw

		Fig. 39
		Fig. 39

before you clean or service it.

This requires disassembly of the engine. If you feel unsure or unqualified

to perform this, take the unit to an authorized service center.

WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it.

Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners

NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 10 hours of operation and then every 25 hours of operation thereafter.

• The engine must be cold when checking or adjusting the valve clearance.

•This task should be performed inside in a clean, dust free area. Fig.31

Cover Hinge

that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth.

STORAGE

•	Never store the unit with fuel in the tank where fumes may reach an open flame or spark.
•	Allow the engine to cool before storing.

1. Remove the five (5) screws on back of the engine cover with a Flat-head or T-20 Torx screwdriver (Fig. 33).

2.Remove the screw behind the engine cover with a Flat- head or T-25 Torx screwdriver (Fig. 34).

3.Disconnect the spark plug wire.

Idle Ajustment Screw

• Lock up the unit to prevent unauthorized use or damage.
•	Store the unit in a dry, well-ventilated area.
•	Store the unit out of the reach of children.

LONG TERM STORAGE

1.	Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more

4. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.

5. Remove the engine cover (Fig. 33 & 34).

6.	Clean dirt from around the rocker arm cover. Remove the	Fig. 32
	screw holding the rocker arm cover with a large flat blade	Fig. 32
	screwdriver or Torx T-25 bit (Fig. 35). Remove the rocker	Remove
	arm cover and gasket.	Remove
	arm cover and gasket.	Screws

7. Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that:

• The piston is at the top of its travel while looking in the spark plug hole (Fig. 36)

• Both rocker arms move freely, and both valves are closed If these statements are not true, repeat this step.

8.	Slide the feeler gauge between the rocker arm and the
	valve return spring. Measure the clearance between the	Fig. 33
	valve stem and rocker arm (Fig. 37). Measure both the	Fig. 33
	intake and exhaust valves.

The recommended clearance for both intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. Figure 38 and 39 show how to measure the clearance.

Remove Screws

Engine

Cover

Muffler

	than 60 days. Dispose of the old gasoline in accordance to Federal, State, and Local regulations.
2.	Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained
	from the carburetor.
3.	Allow the engine to cool. Remove the spark plug and put 5 drops of high quality motor oil into the
	cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the trimmer after storage.

4.Change the oil, referring to Changing the Oil. Dispose of the old oil in accordance to Federal, State and Local regulations.

5.Thoroughly clean the unit and inspect for any loose or damaged parts. Repair or replace damaged parts and tighten loose screws, nuts or bolts. The unit is ready for storage.

TRANSPORTING

•Allow the engine to cool before transporting.

•Secure the unit while transporting.

•Drain the gas tank before transporting.

•Tighten gas cap before transporting.

TROUBLESHOOTING

9. If the clearance is not within specification:

a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 37).

•To increase clearance, turn the adjusting nut

Screw

	ENGINE WILL NOT START
	CAUSE		ACTION

	Empty fuel tank		Fill fuel tank with fuel

counterclockwise.		Fig. 34

•To decrease clearance, turn the adjusting nut clockwise. b. Recheck both clearances, and adjust as necessary.

10.	Reinstall the rocker arm cover using a new gasket. Torque	Rocker Arm Cover
10.	Reinstall the rocker arm cover using a new gasket. Torque
	the screw to 20–30 in•lb (2.2–3.4 N•m).
11.	Reinstall the engine cover. Check alignment of the cover
	before tightening the screws. Tighten screws.
	before tightening the screws. Tighten screws.	Spark Plug Hole
12.	Check the spark plug and reinstall. See Replacing the Spark Plug.	Spark Plug Hole


13.	Replace the spark plug wire.

REPLACING THE SPARK PLUG
	WARNING: To avoid serious personal injury,	Fig. 35
	always turn the unit off and allow it to cool	Adjusting Nuts
	before you clean or service it.	Adjusting Nuts
	Rocker Arms	INTAKE
		INTAKE
Use a replacement part number 791-180852Bspark plug. The
correct air gap is 0.025 in. (0.635 mm.). Remove the plug after
every 25 hours of operation and check its condition.
1.	Stop the engine and allow it to cool. Grasp the plug wire
	firmly and pull the cap from the spark plug.	EXHAUST
	Feeler
	Gauge
		Fig. 36
	Exhaust	Exhaust
	Adjusting Nut	Rocker Arm
		Feeler
		Gauge
	0.003–0.006 in.
	(0.076–0.152 mm)
	Intake Valve	Exhaust Valve
	Stem	Stem

Fig. 37

	Primer bulb wasn't pressed enough		Press primer bulb fully and slowly 10 times

	Old fuel		Drain gas tank and add fresh fuel
	Fouled spark plug		Replace or clean the spark plug

	Plugged spark arrestor		Clean or replace spark arrestor
	When it is above 40°F outside & the Cold Weather		Flip the Cold Weather Start Lever to RUN /
	Start Lever is in the CLOSED / START position		OPEN

	When it is below 40°F outside & the Cold Weather		Flip the Cold Weather Start Lever to CLOSED /
	Start Lever is in the RUN / OPEN position		START and follow the Starting Instructions

	ENGINE WILL NOT IDLE
	CAUSE		ACTION

	Air filter is plugged		Replace or clean the air filter
	Old fuel		Drain gas tank and add fresh fuel

	Improper carburetor adjustment		Adjust according to the Carburetor Adjustments
	Improper carburetor adjustment		section or take to an authorized service dealer
			for an adjustment

	ENGINE WILL NOT ACCELERATE
	CAUSE		ACTION

	Old fuel		Drain gas tank and add fresh fuel
			Adjust according to the Carburetor Adjustments
	Improper carburetor adjustment		section or take to an authorized service dealer
			for an adjustment

	Cutting attachment bound with grass		Stop the engine and clean the cutting attachment
	Dirty air filter		Clean or replace the air filter

	Plugged spark arrestor		Clean or replace spark arrestor