Troy-Bilt TB32 EC Maintenance And Repair Instructions, Operating Instructions

OPERATING INSTRUCTIONS

The Bump Head™ cutting head allows the release of trimming line without stopping the engine. To release more line, lightly tap the cutting head on the ground (Fig. 11) while operating the unit at high speed.

NOTE: Always keep the trimming line fully extended. Line release becomes more difficult when the cutting line gets shorter.

Each time the head is bumped, about 1 inch (25.4 mm) of trimming line releases. A blade in the cutting head shield will cut the line to the proper length if any excess line is released.

For best results, tap the bump knob on bare ground or hard soil. If attempting a line release in tall grass, the engine may stall. Always keep the trimming line fully extended. Line release

MAINTENANCE AND REPAIR INSTRUCTIONS

AIR FILTER MAINTENANCE

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

Cleaning the Air Filter

Failure to maintain the air filter properly can result in poor performance or can cause permanent damage to the engine.

1. Open the air filter cover by pressing the lock tab in and pulling out on the air filter cover (Fig. 23).

becomes more difficult when the cutting line gets shorter.

Fig. 11

2.	Remove the air filter (Fig. 23).	Air Filter Cover
3.	Wash the filter in detergent and water. Rinse the filter thoroughly and allow it to dry.	Lock
		Tab

NOTE: Do not rest the Bump Head™ on the ground while the unit is running.

Some line breakage will occur from:

• Entanglement with foreign matter

• Normal line fatigue

• Attempting to cut thick, stalky weeds

• Forcing the line into objects such as walls or fence posts

TIPS FOR BEST TRIMMING RESULTS

• Keep the cutting head parallel to the ground.

• Do not force the cutting head. Allow the tip of the line to do the cutting, especially along walls. Cutting with more than the tip will

reduce cutting efficiency and may overload the engine.

4.	Apply enough clean SAE 30 motor oil to lightly coat the filter.
5.	Squeeze the filter to spread and remove excess oil.
6.	Replace the air filter into the air filter cover (Fig. 23).
NOTE: Operating the unit without the air filter WILL VOID the warranty.
7.	Close the air filter cover by swinging it to the left and then pressing it down until the	Air Filter
	lock tab snaps into place (Fig. 23).	Fig. 23

IDLE SPEED ADJUSTMENT

The idle speed of the engine is adjustable. An idle adjustment screw is between the air filter cover and the engine starter housing (Fig. 24).

• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear or engine drag.

• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are thrown away from

the operator.

• Slowly move the unit into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side

motion. Cutting shorter lengths produces the best results.

• Trim only when grass and weeds are dry.

NOTE: Careless adjustments can seriously damage the unit. An authorized service dealer should make carburetor adjustments.

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

1. Start the engine and run for one minute to warm up. Refer to Starting and Stopping Instructions.

Idle Adjustment Screw

• The life of the cutting line is dependent upon:

• Following the trimming techniques

• What vegetation is being cut

• Where vegetation is cut

For example, the line will wear faster when trimming against a foundation wall as opposed to trimming around a tree.

2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small
Phillips screwdriver into the idle adjustment screw (Fig. 24). Turn the idle speed	Fig. 24
screw 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), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter and adjusting the idle speed should solve most engine problems. If not

DECORATIVE TRIMMING

Fig. 12

and all of the following are true:

Decorative trimming is accomplished by removing all vegetation around trees, posts, fences, etc..

Rotate the whole unit so that the cutting head is at a 30° angle to the ground (Fig. 12).

MAINTENANCE AND REPAIR INSTRUCTIONS

MAINTENANCE SCHEDULE

WARNING: To prevent serious injury, never perform maintenance or repairs with unit running. Always service and repair a cool unit. Disconnect the spark plug wire to ensure that the unit cannot start.

Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any seasonal tune-up.

NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures, take your unit to any non-road engine repair establishment, individual or authorized service dealer.

NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any non-road engine repair establishment, individual or authorized service dealer.

NOTE: Please read the California/EPA statement that came with the unit for a complete listing of terms and coverage for the emissions control devices, such as the spark arrestor, muffler, carburetor, etc.

FREQUENCY	MAINTENANCE REQUIRED	SEE
Before starting engine	Fill fuel tank with fresh fuel	p. 3
Every 10 hours	Clean and re-oil air filter	p. 4
Every 25 hours	Check spark plug condition and gap	p. 4

•the engine will not idle

•the engine hesitates or stalls on acceleration

WARNING: The cutting attachment will spin during idle speed adjustments. Wear protective clothing and observe all safety instructions to prevent serious personal injury.

• there is a loss of engine power

Have the carburetor adjusted by an authorized service dealer.

REPLACING THE SPARK PLUG

Use replacement #753-06193, a Champion RDJ7J spark plug, or equivalent. The correct air gap is 0.025 inch (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 it from the
	spark plug.
2.	Clean around the spark plug. Remove the spark plug from the cylinder head by turning
	a 5/8-inch socket counterclockwise.
		WARNING: Do not sand blast, scrape or clean electrodes. Grit in
		the engine could damage the cylinder.
			0.025 in.
			(0.635 mm.)
3.	Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm)
				Fig. 25
	using a feeler gauge (Fig. 25).

4.Install a correctly-gapped spark plug in the cylinder head. Tighten by turning the 5/8-inch 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.

REPLACING THE TRIMMING LINE

WARNING: Never use metal-reinforced line, wire, chain or rope.

These can break off and become dangerous projectiles.

Only use the trimming line described in the Specifications section. Other types of trimming line may cause the engine to overheat or fail.

NOTE: Always use the correct line length when installing trimming line. The line may not release properly if the line is too long.

Part 1 - Removing the Inner Reel

1. Hold the outer spool with one hand and unscrew the bump knob counterclockwise (Fig. 13).

NOTE: The outer spool will remain attached to the unit.

2. Inspect the bolt inside the bump knob to make sure it moves freely. Replace the bump knob if it is damaged.

3. Remove the inner reel from the outer spool (Fig. 14).

4. Remove the spring from the inner reel (Fig. 14).

5. Use a clean cloth to clean the inner reel, spring, shaft and inner surface of the outer

spool.

6. Check the indexing teeth and holding slots for wear (Fig. 15). If necessary, remove burrs or replace the inner reel and outer spool.

Outer Spool	Bump Knob
	Bolt

Fig. 13

Outer Spool Inner Reel

Spring

Shaft

Fig. 14

Indexing Teeth

Proceed to Part 2 - Winding New Trimming Line onto the Inner Reel.

Part 2 - Winding New Trimming Line onto the Inner Reel

•If using single line, refer to Winding Single Line.

•If using split line, refer to Winding Split Line.

•If using a prewound inner reel, proceed to Part 3 - Installing the Inner Reel.

Winding Single Line

1. Cut two 8-foot (2.4 m) lengths of new single trimming line.

2.Insert the end of one line into the top hole in the inner reel (Fig. 16). Wind the line tightly in the

direction shown on the bottom of the inner reel	Split Wall
until about 6 inches (150 mm) of line remains.
Keep the line above the split wall. Insert the 6-
inch section into the nearest .095 holding slot
(Fig. 17).
3. Insert the end of the other line into the bottom
hole in the inner reel (Fig. 18). Wind the line
tightly in the direction shown on the bottom of
the inner reel until about 3 to 9 inches (75 to 225
mm) of line remains. Keep the line below the
split wall. Insert the 3 to 9-inch section into the	Split Wall
opposite .095 holding slot (Fig. 19).
NOTE: Failure to wind the line in the direction
indicated will cause the cutting head to operate
incorrectly.

Proceed to Part 3 - Installing the Inner Reel.

Winding Split Line

1. Cut one 6-foot (1.8 m) length of new split line trimming line. Split each end about 6 inches (150 mm).

Split Wall

2.Using one split end, insert one line into the top hole and the other line into the bottom hole in the inner reel (Fig. 20).

Top Hole

Fig. 16

Bottom Hole

Fig. 18

Top Hole

Bottom Hole

Fig. 20

Holding Slots

Fig. 15

Split Wall Holding Slot

Fig. 17

Split Wall Holding Slot

Fig. 19

Holding Slots

Fig. 21

Outer Spool Spring Inner Reel

3. Wind the line tightly in the direction shown on the bottom of the inner reel. The split wall will automatically divide the line. Wind the line until it is completely divided and about 6 inches (150 mm) of line remains.

NOTE: Failure to wind the line in the direction indicated will cause the cutting head to operate incorrectly.

4. Insert the two 6-inch sections into the two .095 holding slots (Fig. 21).

Proceed to Part 3 - Installing the Inner Reel.	Eyelets	Bump Knob
	Fig. 22
Part 3 - Installing the Inner Reel

1.Pass the two line ends through the eyelets in the outer spool. Place the spring inside the inner reel. Insert the inner reel into the outer spool. Push the inner reel and outer spool together (Fig. 22).

NOTE: The spring must be assembled on the inner reel before reassembling the cutting head.

2.While holding the inner reel and outer spool together, firmly pull the two line ends to release them from the holding slots.

3.While holding the inner reel and outer spool together, screw the bump knob on clockwise. Tighten the bump knob securely.

4