User Manual For Tuffy Troy-bilt Tb20cs
15
MAINTENANCE AND REPAIR INSTRUCTIONS
Sep 22, 2017 Yes, printed Troy-Bilt Operator's Manuals, Illustrated Parts Lists and Troy-Bilt / MTD Engine Manuals are available for purchase. The price for a pre-printed manual is typically less than $20+s/h, but can range up to $45+s/h for larger documents.
- Garden product manuals and free pdf instructions. Find the user manual you need for your lawn and garden product and more at ManualsOnline Page 2 of Troy-Bilt Trimmer TB20CS User Guide ManualsOnline.com.
- Summary of Contents for Troy-Bilt TB20CS Page 1: Save These Instructions Operator’s Manual 2-Cycle Gasoline Trimmer TB20CS S t a r t i n g SAVE THESE INSTRUCTIONS For service call 1-800-828-5500 in the United States, or 1-800-668-1238 in Canada to obtain a list of authorized service dealers near you.
Check Fuel Mixture
Old and/or improperly mixed fuel is usually the reason
for improper unit performance. Drain and refill the tank
with fresh, properly-mixed fuel prior to making any
adjustments. Refer to Oil and Fuel Information.
Clean Air Filter
The condition of the air filter is important to the operation
of the unit. A dirty air filter will restrict air flow and
change the air/fuel mixture. This is often mistaken for an
out of adjustment carburetor. Check the condition of the
air filter before adjusting the idle speed screw. Refer to
Air Filter Maintenance.
Adjust Idle Speed Screw
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 let it run at a high idle for a
minute to warm up. Refer to Starting/Stopping
Instructions.
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air
filter/muffler cover (Fig. 30).
NOTE: Careless adjustments can seriously damage your
unit. An authorized service dealer should make
carburetor adjustments.
The cutting
attachment may spin
during idle speed adjustments. Wear
protective clothing and observe all safety
instructions to prevent serious personal injury.
WARNING:
Idle Speed Screw
Fig. 30
If the spark arrestor
hood and spark
arrestor screen are not tightened securely,
they could fall off causing damage to the unit
and possible serious personal injury.
WARNING:
Fig. 29
SPARK ARRESTOR MAINTENANCE
1. Remove air filter/muffler cover. Refer to Removing
User Manual For Tuffy Troy-bilt Tb20cs Trimmer
the Air Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the
screw on the bottom of the muffler (Fig. 29). Remove
the screw using either a torx #20 or flat blade
screwdriver.
3. Carefully pry up the left side spark arrestor hood.
Two tabs act as hinges on the right side of the hood.
Flip open the spark arrestor hood like a door and
then pull its tabs out of the muffler slots.
4. Using a small flat blade screwdriver, carefully pry the
spark arrestor screen out from the inside of the spark
arrestor hood.
5. Clean the spark arrestor screen with a wire brush.
Replace it if it is damaged, or if you are unable to
clean it thoroughly.
6. Reinstall the spark arrestor screen snugly back into
the spark arrestor hood.
7. Reinstall the two hood tabs into the two muffler slots
and flip the spark arrestor hood closed.
8. Replace the screw you removed in Step 2 and tighten
it securely.
9. Reinstall the air filter/muffler cover.
Spark Arrestor
Screen
Spark Arrestor
Hood
Screw
Muffler
Engine
Tabs
Slots
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The starter pulley on a Troy-Bilt TB20CS string trimmer rotates while pulling the starter rope fairly gently. This winds up the recoil spring to the point where it accumulates enough force to turn the engine over. At this point, the spring releases its energy, spinning the flywheel and starting the engine. Although this action minimizes wear, starter ropes do occasionally break.
1
Drain the fuel tank to avoid spills, turn the machine upside down, and pull the rubber spark plug boot of the plug. Undo the four screws securing the muffler cover and air filter to the engine using a T-20 Torx head screwdriver.
2
Disengage the E-Z lever from the securing knob on the carburetor by rotating the muffler-air filter cover and pushing it down toward the fuel tank. Remove the spark plug with a 5/8-inch tube wrench. Remove the single Torx T-20 screw securing the shroud extension to the starter housing assembly. Pull the shroud extension off the assembly and lay it aside.
3
Remove the right half of the throttle housing by undoing the three Torx T-20 screws holding the two halves together. Slide the housing half-section off the clutch housing and separate it from the trimmer power drive shaft or boom.
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4
Record the configuration of cable and wires inside the throttle housing with a smart phone snapshot or with a sketch. Secure the throttle trigger, return spring, cable, stop-switch and ground wires to the right half of the throttle housing with a rubber band. Snip through the cable tie securing the flexible conduit to the starter housing assembly with a pair of side cutters.
5
Remove the three Torx T-20 screws securing the black fluted clutch housing to the starter housing and separate the clutch housing and boom from the engine, but do not disconnect the throttle cable or ground wires. This will reveal the silver clutch drum on the bottom of the engine assembly.
6
Remove the tapered compression spring surrounding the nose of the black fluted clutch drum and discard it. Note: This only applies to earlier string trimmer models fitted with this tapered compression spring; later models do not have this spring.
7
Stuff a length of old starter rope into the engine’s spark plug hole to fill the gap between the piston and cylinder head; this will prevent the crankshaft from turning while removing and reinstalling the clutch drum.
8
Insert a Torx T25 extension fitted to a 3/8-inch drive ratchet into the opening containing the center retaining screw that secures the clutch drum to the engine. Undo the retaining screw by turning the ratchet counterclockwise. Slide the clutch drum off. Remove the thrust washer and screw, place them in a container for safe-keeping and set the drum aside.
9
Slide the clutch removal tool, part number 180919, over the clutch rotor. Have a helper hold the motor assembly and apply initial counterclockwise force to the removal tool with a 3/4-inch wrench to loosen the rotor. Spin the rotor off once it’s loosened, remove the flat washer and lay both parts aside.
10
Remove the four Torx T-20 screws securing the recoil housing assembly to the engine. Rotate the housing out of the way without disconnecting the throttle cable and ground wires. This will reveal the recoil starter components.
11
Put on a pair of safety glasses. Remove the three Torx T-20 screws securing the pressure plate assembly inside the housing to the engine. Lift the assembly off carefully to avoid damaging the cable looped through the notches in the recoil housing.
12
Remove the starter handle by gripping the rope and cutting it with the side cutters if it is still intact, and then ease the rope forward to relieve spring tension. Carefully remove the central pulley retainer tube by gripping the protruding upper rim with the side cutters and withdrawing the tube.
13
Slide the outer pulley off the shaft slowly and carefully. Press the inner and outer pulley together while doing so to avoid releasing the recoil spring or the starter assist spring from their retainers. Lift the inner pulley slightly to reveal both ends of the starter recoil spring. Inspect the spring to ensure that the curled inner end is seated snugly inside the notch on the hub of the starter housing and the outer end is hooked around the post on the inner rim of the outer pulley.
14
Thread the end of a new starter rope through the hole inside the outer pulley. Tie an overhand knot on the end protruding through the inside of the outer pulley, draw the knot as tight as possible and then press the two pulley halves together.
15
Smear a dab of silicone grease around the column that the recoil pulley fits over. Thread the end of the rope through the eyelet in the starter housing. Tie a slip knot on the rope near the handle to prevent the loose end from entering the eyelet. Wind the rope around the outer pulley until the slip knot reaches the eyelet.
16
Thread the end of the rope up through the starter handle, secure the end with an overhand knot, grip the rope, and give the handle a sharp tug to tighten the knot. Slide the recoil pulley assembly over the column. Release the slip knot and continue winding the pulley until the handle rests against the eyelet. Tuck the inner part of rope into the slot on the outer rim of the recoil pulley and press the assembly snugly into place.
17
Secure the recoil pulley assembly by sliding a new retainer tube over the shaft. Select a deep socket matching the diameter of the retainer tube's upper flange. Place the end of the socket on the flange and tap the tube gently into place with a rubber mallet. Check the clearance between the new retainer tube flange and the pulley with a set of feeler gauges; it should be between 0.015 and 0.030 inches. Pull the starter rope handle a couple of times to ensure that the pulley moves freely.
18
Reinstall the pressure plate and loop the ground wire through the notches on the recoil housing to ensure that the wire doesn’t get pinched or foul any rotating components. Secure the pressure plate with the three Torx T-20 screws removed earlier. Replace the clutch rotor and tighten it with the clutch removal tool. Reassemble the clutch drum and thrust washer and secure it with the Torx T-25 screw removed earlier.
19
Reposition the black fluted clutch housing on the starter housing and secure it with the four Torx T-20 screws removed earlier. Remove the rubber band from around the right half of the throttle housing. Make sure that the throttle trigger, return spring, cable, stop-switch and ground wires are still in place by referring to your snapshot or sketch.
20
Press the two halves of the throttle housing together, secure them with the three Torx head screws removed earlier and attach the wire conduit to the starter housing assembly with a new cable tie. Reinstall the shroud extension and secure it with the screw removed earlier.
21
Pull the old length of starter rope out through the spark plug opening. Install a new spark plug and tighten it securely with the 5/8-inch tube wrench. Rotate the muffler and air filter cover back into place. Re-engage the E-Z lever to the securing knob and secure the cover to the engine with the four Torx head screws removed earlier.
22
Replace the spark plug boot, refuel the trimmer and start the engine to ensure that everything works properly.
Things You Will Need
- T-20 Torx head screwdriver
- 5/8-inch tube wrench
- Smart phone camera or note pad
- Rubber band
- Side cutters
- Old starter rope
- Torx T25 extension fitted to a 3/8-inch drive ratchet
- Clutch removal tool, part number 180919
- 3/4-inch wrench
- Safety glasses
- New starter rope
- Silicone grease
- New clutch drum retainer tube
- Rubber mallet
- Set of feeler gauges
- Cable tie
- Troy-Bilt spark plug
Tip
- Seal both ends of the new starter rope by carefully melting the tips with a match or cigarette lighter.
Warning
- Always wear safety glasses when working on the recoil starter; springs can slip off their retainers and snap violently upward.
References (2)
About the Author
After graduating from the University of the Witwatersrand and qualifying as an aircraft engineer, Ian Kelly joined a Kitchen remodeling company and qualified as a Certified Kitchen Designer (CKD). Kelly then established an organization specializing in home improvement, including repair and maintenance of household appliances, garden equipment and lawn mowers.
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