Troy-Bilt TB310QS - Manual (Page 6)

6
MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTENANCE SCHEDULE
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.
In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary
after 50 hours of operation. If you notice lost RPM, poor performance or general lack of acceleration, this
service may be required. If you feel your engine is in need of this inspection, refer service to any non-road
engine repair establishment, individual or authorized service dealer for repair. DO NOT attempt to perform this
process yourself as engine damage may result from contaminants involved in the cleaning process for the port.
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.
FREQUENCY MAINTENANCE REQUIRED SEE
Before starting engine Fill fuel tank with fresh fuel Page 4
Every 10 hours Clean and re-oil air filter Page 6
Every 25 hours Check and clean spark arrestor
Check spark plug condition and gap Page 6
Page 6
Every 50 hours Inspect exhaust port and spark arrestor screen for clogging
or obstruction to assure maximum performance levels Page 6
AIR FILTER MAINTENANCE
Removing the Air Filter/Muffler Cover
1. Place the choke lever in Position 2.
NOTE: The choke lever must be in Position 2 (Fig. 21) to
remove the air filter/muffler cover.
2. Remove the four (4) screws securing the air filter/muffler
cover (Fig. 21). Use a T20 Torx bit screwdriver.
2. Pull the cover from the engine. Do not force.
Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation. It is an important
item to maintain. Failure to maintain your air filter properly can result in
poor performance or can cause permanent damage to your engine.
1.
Remove air filter/muffler cover. Refer to Removing the Air
Filter/Muffler Cover.
2. Turn cover over and look inside to locate the air filter.
Remove the air filter from inside the air filter/muffler cover
(Fig. 22).
3. Wash the filter in detergent and water (Fig. 23). Rinse the filter
thoroughly. Squeeze out excess water. Allow it to dry completely.
4. Apply enough clean SAE 30 oil to lightly coat the filter (Fig. 24).
5. Squeeze the filter to spread and remove excess oil (Fig. 25).
6. Replace the air filter inside the air filter/muffler cover (Fig. 22).
NOTE: Operating the unit without the air filter and air
filter/muffler cover assembly will VOID the warranty.
Reinstalling the Air Filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the
carburetor and muffler. Align the screw holes.
NOTE: The choke lever must be in Position 2 (Fig. 21) to
install the air filter/muffler cover.
2. Insert the four (4) screws into the holes in the air
filter/muffler cover (Fig. 21) and tighten.
Do not over tighten.
SPARK ARRESTOR MAINTENANCE
NOTE: The exhaust can only flow in one direction: AWAY
from the engine. Pay close attention when
disassembling the muffler so you can put it back
together correctly. Failure to do so will damage the
unit and may cause serious personal injury.
1. Remove air filter/muffler cover. Refer to Removing the Air
Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the two (2) screws
on the bottom of the muffler (Fig. 26). These two screws hold the
Spark Arrestor Hood Assembly and the spark arrestor screen to
the bottom of the muffler. Remove the two (2) screws using either
a torx #20 or flat blade screwdriver.
3. Using a small flat blade screwdriver, carefully pry up the spark
arrestor screen from the recessed hole, taking care to notice that
the “raised” part of the spark arrestor screen is inside the recessed
hole. Remove the spark arrestor screen from the muffler.
4. Clean the spark arrestor screen with a wire brush. Replace
it if it is damaged, or if you are unable to clean it thoroughly.
5. Reinstall the spark arrestor screen by putting the “raised”
portion of the screen inside the recessed hole of the muffler.
Make sure that the spark arrestor screen fits flat against the
muffler.
6. Place the spark arrestor plate on top of the spark arrestor
with the “raised” side up and the opening facing towards the engine (Fig. 26).
7. Place the spark arrestor hood on top of the spark arrestor plate with the “raised” side up and the opening
facing AWAY from the engine (Fig. 26). Verify that the exhaust will be directed AWAY from the engine.
8. Replace the two screws you removed in Step 2 and tighten them securely.
9. Reinstall the air filter/muffler cover.
MAINTENANCE AND REPAIR INSTRUCTIONS
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air filter/muffler cover (Fig. 27).
NOTE:
Careless adjustments can seriously damage your unit. An authorized service dealer should
make carburetor adjustments.
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
adjuster as follows.
1.
Start the engine and let it run at the fast position for a minute to warm up.
2. Set the blower/vacuum mode Quickshift ® lever to the up position (Blower Mode). Refer to Operating as a Blower.
NOTE: Setting the lever to the blower mode prevents the vacuum bag from filling up while starting or
running the unit.
3. Move the throttle control and let the engine idle. If the engine stops, insert a small phillips
screwdriver into the hole in the air filter/muffler cover (Fig. 27). Turn the idle speed adjuster in,
clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.
4. If the unit appears to be idling too fast, turn the idle speed adjuster 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 and all of the 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.
REPLACING THE SPARK PLUG
Use spark plug P/N 791-610311B, 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.
3. Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.025 inch (0.635 mm) using a
feeler gauge (Fig. 28).
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.
CLEANING THE UNIT
Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners
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.
CLEANING THE VACUUM BAG
1. Empty the bag after each use to avoid deterioration and obstructing air flow, which will reduce the
performance of the vacuum.
2. Wearing eye protection and a dust mask, clean the bag as needed. Turn the bag inside out after
initial emptying and vigorously shake out dust and debris.
3. Wash the bag once a year or more often if needed:
a. Remove the vacuum bag.
b. Turn bag inside out.
c. Hang it up.
d. Hose it down thoroughly.
e. Hang to dry.
f.
Turn bag right-side out and reinstall.
STORAGE
• Never store a fueled unit where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Store the unit locked up to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
Blue Choke
Lever
Screws
Position 2
Fig. 21
Screws
Air Filter
Inside Muffler Cover
Fig. 22
WARNING: 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: Do not sand blast, scrape or clean electrodes. Grit in the engine could
damage the cylinder.
WARNING: To avoid serious personal injury, always turn your trimmer off and allow it to
cool before you clean or service it.
Fig. 25
Slots
Spark
Arrestor
Hood
Screw
Fig. 26
Tabs
Spark Arrestor
Screen
Engine
Muffler
Idle Speed Screw
Fig. 27
Fig. 23
Fig. 24
0.025 in.
(0.635 mm)
Fig. 28
WARNING: This unit will need to be running during
idle speed adjustment. Wear protective clothing and
observe all safety instructions to prevent serious
personal injury.
Also, DO NOT set unit on any surface except a clean,
hard area while starting or performing any adjustments.
Debris such as gravel, sand, dust, grass, etc. could be
picked up by the air intake and thrown out by the
discharge opening, damaging unit, property, or causing
serious injury to bystanders or operator.
WARNING: To avoid serious personal injury,
always turn your unit off and allow it to cool
before you clean or service it.