Troy-Bilt TB138PS Operator's Manual page 7

MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTAINING THE GUIDE BAR
Clean the bar grooves after heavy use, when the saw chain
appears dirty and whenever the saw chain is removed.
Refer to Cleaning and Storage instructions. This will help
keep the oil passages open to provide proper lubrication to
the bar and chain.
After every week of use, rotate the guide bar on the saw to
distribute the wear for maximum guide bar life (Fig. 46).
Frequently check the guide bar for damage. Feathering and
burring of the guide bar rails (the ridges on either side of
the bar groove) is a normal process of guide bar wear. Such
faults should be smoothed with a file as soon as they occur.
A guide bar with the following faults should be replaced:
• Wear inside the guide bar rails that permits the chain to
lay sideways.
• Bent guide bar.
• Cracked or broken rails.
• Spread rails.
MAINTAINING THE BAR AND CHAIN LUBRICATION
Setting the Bar Lube Adjustment Screw
Oil is dispersed automatically onto the saw chain as the
unit is used. To adjust the rate of flow:
1. Insert a 3/32-inch Allen wrench into the bar lube
adjustment screw (Fig. 47).
2. Rotate the screw counterclockwise to increase the flow
of oil to the chain.
3. Rotate the screw clockwise to decrease the flow of oil to
the chain.
NOTE: Always keep an adequate amount of bar and
chain oil in the bar lube reservoir. Check the oil
level frequently and refill the reservoir as needed.
Oil Passages
The oil passages in the bar mount (Fig. 48) should be
cleared to ensure proper lubrication of the bar and chain
during operation. This can be done using a soft wire small
enough to insert into the oil discharge hole.
CLEANING AND STORAGE
WARNING:
Do not let brake fluids, gasoline, petroleum-based products, penetrating oils,
etc., come in contact with plastic parts. These chemicals may damage, weaken and
destroy plastic, which may result in serious personal injury.
CLEANING INSTRUCTIONS
1. Stop the motor and wait for all moving parts to stop.
2. Disconnect the unit from the power source and allow the unit to cool. Refer to Connecting and
Disconnecting the Power Source.
3. Slacken the pole saw chain if it was retensioned at operating temperature during cutting work. The
chain contracts as it cools down. If it is not slackened, it may damage the gearbox and bearings.
4. Wipe the unit down with a damp cloth. Do not douse the unit with water. Do not use solvents or
strong detergents. If preparing the unit for long-term storage (three months or more), remove the
chain and guide bar, then clean the unit thoroughly with a damp cloth. A firm-bristled, non-wire,
brush can be used to remove debris from the bar groove and assembly. When finished, reassemble
the unit. Refer to Removing/Replacing the Guide Bar and Chain.
5. Spray the guide bar and chain with corrosion inhibiting oil.
STORAGE INSTRUCTIONS
NOTE: It is normal for oil to seep from the pole saw Add-On when it is not in use. Please take this
into consideration when storing the unit.
1. Follow the Cleaning Instructions listed above.
2. Attach the scabbard to the guide bar and chain on the pole saw Add-On.
3. Store the unit indoors in a dry, high and/or locked location, out of the reach of children and other
unauthorized persons.
THE MOTOR WILL NOT RUN
CAUSE
The cord is not securely connected to the unit or
power source
The GFCI in the outlet has tripped (if used)
The breaker switch has tripped
THE CUTTING ATTACHMENT WILL NOT ADVANCE LINE
CAUSE
Fig. 46
The cutting attachment is bound with grass
Bar Lube
Adjustment Screw The cutting attachment is out of line
The inner reel is bound up
The cutting head is dirty
The line is welded
The line twisted when it was refilled
Not enough line is exposed
Fig. 47
THE CUTTING LINE ADVANCES UNCONTROLLABLY
Oil Discharge
CAUSE
Hole
Oil, cleaner or lubricant is in the cutting head
THE BAR AND CHAIN ARE RUNNING HOT AND SMOKING OR STUCK
CAUSE
The chain tension is too tight
The bar lube reservoir is empty
THE CHAIN DOES NOT ROTATE WHILE THE MOTOR IS RUNNING
Fig. 48
CAUSE
The chain tension is too tight
The guide bar and chain are assembled incorrectly
The guide bar and chain are damaged
The drive assembly is damaged
THE CHAIN ROTATES, BUT DOES NOT CUT
CAUSE
The chain is dull
The chain is on backwards
NOTE: For maintenance beyond the minor adjustments listed above, or for replacement parts, please
call the Customer Support Department at 1-800-828-5500 (U.S.) or 1-800-668-1238 (Canada).
MOTOR*
Motor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric, Corded
Motor Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 VAC
Motor Amperage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Amps
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 7,400 RPM
On/Off Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger
DRIVE SHAFT AND CUTTING HEAD*
Drive Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube (EZ-Link
Cutting Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head
Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 inches (76.2 mm)
Trimming Line Diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.080 inches (2.03 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 inches (43.18 mm)
Approximate Unit Weight (with cutting attachment, shield and D-handle) . . . . . . . . . . . . . . 9 lb (4.1 kg)
POLE SAW ADD-ON*
Drive Shaft Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 inches (66 cm)
Cutting Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 inches (20.3 cm)
Approximate Weight of the Add-On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 lb 5 oz (1.5 kg)
* All specifications are based on the latest product information available at the time of printing. We
reserve the right to make changes at any time without notice.
REPLACEMENT PARTS
Part #
753-05594 . . . . . . .
753-05592 . . . . . . .
THE EZ-LINK
The EZ-Link
Listing by Underwriters Laboratories Inc.:
Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720
Edger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720
Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS725
Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720
Pole Saw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS720
TROUBLESHOOTING
SPECIFICATIONS
Description
Guide Bar
Saw Chain
TM SYSTEM
TM system enables the use of these optional Add-Ons, which have not been evaluated for
SOLUTION
Make sure each plug is securely connected
Reset the GFCI
Reset the breaker switch in the home electrical
panel
SOLUTION
Stop the motor, disconnect the unit from the
power source and clean the cutting attachment
Refill the cutting attachment with new line
Replace the inner reel
Clean the inner reel and outer spool
Disassemble, remove the welded section and
rewind the line
Disassemble and rewind the line
Push the bump knob and pull out the line until 4
inches (102 mm) of line is outside the cutting
attachment
SOLUTION
Clean and thoroughly dry the cutting head
SOLUTION
Adjust the chain tension
Refill the bar lube reservoir
SOLUTION
Adjust the chain tension
Refer to Removing/Replacing the Guide Bar and
Chain
Inspect the guide bar and chain for damage
Refer to Service Information
SOLUTION
Sharpen the chain
Reverse the direction of the chain
TM )
TM
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