MTD Troy-Bilt TB525CS TB575SS 4 Cycle Gas Trimmer Owners Manual

MAINTENANCE AND REPAIR INSTRUCTIONS
with a Flat-head or
T-25 Torx
4.
5.
Replace cracked, fouled or dirty spark plug.  Set the air gap at
0.025 in. (0.635 mm.) using a feeler  gauge (Fig. 48).
Install a correctly-gapped spark plug in the  cylinder head. Turn
the 5/8 in. socket clockwise until snug.
Cache-
culbuteur
screwdriver (Fig. 44).
2
.
.
Disconnect the
spark plug wire.
Clean dirt from
Trou de
bougie
If using a torque wrench torque to:
110-120 in.•lb. (12.3-13.5 N•m)
3
around the spark
plug. Remove the
spark plug from the
cylinder head by
turning a 5/8 in.
Do not over tighten.
WARNING:
electrodes. Grit in the engine could damage  the
cylinder.
Do not sand blast, scrape or clean
Fig. 45
socket counterclockwise.
4.
5.
Remove the engine cover (Fig. 44).
SPARK ARRESTOR MAINTENANCE
Clean dirt from around the rocker arm  cover. Remove the
screw holding the rocker arm cover with  a large flat blade
screwdriver or Torx T-25 bit (Fig. 45).  Remove the rocker arm
cover and gasket.
1.
2.
Remove the rear engine cover. See Rocker  Arm Clearance.
With a flat blade screwdriver or Torx  T-20 bit and a T-25 bit,
remove the screws attaching the spark arrestor  cover to the
muffler (Fig. 49).
Rocker Arms    Intake
Adjustment
Nuts
6.
Pull the starter rope
slowly to bring the
piston to the top of
its travel, (known as
top dead center).
Check that:
Muffler
Spark Arrestor Screen
3.
4.
Pull the tab on the
spark arrestor cover
out of the muffler.
Remove the spark
arrestor cover.
Diverter
Exhaust
T-20 Screw
Feeler Gauge
T-25 Screw
Remove the spark
arrestor screen from
the spark arrestor
cover.
The piston is at the
Fig. 46
top of its travel while  Adjustment Nut
Rocker Arm
Slot
looking in the spark
Feeler
Gauge
plug hole (Fig. 45).
Fig. 49
5.
6.
Clean the spark
Both rocker arms
arrestor screen with a wire brush or  replace it.
move freely, and
both valves are
closed.
.003-.006
in.
Reinstall the spark arrestor screen, spark arrestor cover and screws.
(.076-0.152 mm)
WARNING:
To avoid serious personal injury, always
turn your unit off and allow  it to cool before you clean
or service it.
Valve Stem
If these statements are
not true, repeat this step.
7.
Slide the feeler
gauge between the
rocker arm and the valve return spring. Measure the clearance
between the valve stem and rocker arm (Fig. 47). Measure both
the intake and exhaust valves.
Fig. 47
CLEANING
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.
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. See Figures 46
and 47.
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.
Lock up the unit to prevent unauthorized  use or damage.
8.
If the clearance is not within specification:
a. Turn the adjusting nut using a  5/16 inch (8 mm) wrench or nut
driver (Fig. 47).
To increase clearance, turn the adjusting  nut counterclockwise.
To decrease clearance, turn the adjusting  nut clockwise.
•  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 than 60 days. Dispose
of the old gasoline in accordance to  Federal, State, and Local
regulations.
b. Recheck both clearances, and adjust as  necessary.
9.
Reinstall the rocker arm cover using a  new gasket. Torque the
screw to 20–30 in•lb (2.2–3.4 N•m).
1
1
1
0.  Check the spark plug and reinstall. See Replacing the Spark Plug.
1.  Replace the spark plug wire.
2.  Reinstall the engine cover. Check  alignment of the cover before
tightening the screws. Tighten screws.
2.
3.
Start the engine and allow it to  run until it stalls. This ensures
that all gasoline has been drained from  the carburetor.
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.
REPLACING 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.
Use a replacement part number 753-05255 spark  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.
4.
Change the oil, referring to Changing the  Oil. Dispose of the
old oil in accordance to Federal, State  and Local regulations.
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.
Stop the engine and
allow it to cool.
5.
Remove the six (6)
screws on the back of
the engine cover with a
Flat-head or T-25 Torx
screwdriver (Fig. 44).
0.025 in.
(0.635 mm.)
TRANSPORTING
•  Allow the engine to cool before transporting.
Fig. 48
Secure the unit while transporting.
Drain the gas tank before transporting.
Tighten gas cap before transporting.
2.
3.
Grasp the plug wire firmly and pull  the cap from the spark plug.
Clean dirt from around the spark plug. Remove the spark plug from
the cylinder head by turning a 5/8 in. socket counterclockwise.
10
Product Specification
CategoriesLawn Mower Manual, MTD Lawn Mower Manuals, MTD Trimmer Manuals, Trimmer Manuals, Troy-Bilt Lawn Mower Manuals
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- 52 pages
Document TypeOwner's Manual
LanguageEnglish
Product BrandMTD, Lawn Mower
Product TypeWalk Behind Mower
Document File TypePDF
Publishermtdproducts.com
Wikipedia's PageMTD Products
CopyrightAttribution Non-commercial
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