Tanaka TS-720 - Manual (Page 10)

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Owner’s Manual
TS-720 E-Z Tiller™
Maintenance
1. (FIG. 13) Air Cleaner – The air cleaner elements must be removed and cleaned every
twenty-five hours or at the beginning of each season. More frequent cleaning is
recommended under very dusty conditions. Thoroughly wash the elements in liquid
detergent and water. Press the elements in a rag until they are completely dry, saturate
them in 2-cycle oil or the equivalent. Squeeze the elements to distribute the oil and to
remove any excess oil. Replace elements and install cover.
2. (FIG. 14) Spark Plug - Clean and re-gap the spark plug after every twenty-five hours of
operation. Before removing plug clean around plug base to prevent foreign material from
entering the cylinder when the plug is removed. Set spark plug gap at .023 in. or 0.6mm.
3. (FIGS. 15 & 16) Muffler/Exhaust Port/Cylinder - At the end of each season (or after 25
hours of use) the muffler must be removed and cleaned to prevent carbon accumulation. At
the same time, the exhaust port should be cleaned. After removing the muffler, crank the
engine over until the piston completely covers the exhaust port. This will prevent any foreign
material from entering the engine. Now clean the exhaust port using a wood scraper only
(FIG. 16). At the same time, the cylinder cooling fins should be inspected and cleaned. If
debris is collected in the cooling fins, the engine will run hot and this could result in serious
engine damage. Use a wood scraper for cleaning the cylinder cooling fins (FIG. 15).
4. (FIG. 17) Tine Shaft/Gear Case - The tine shaft should be
thoroughly cleaned and oiled with a multi-purpose oil after every
twenty-five hours of operation. The tine shaft should also be
lubricated prior to storage. Every 25 hours and/or at the beginning
of each season, the gear case should be filled with grease.
Remove the gear case cover by removing four screws (1) and the
bolt (2). Fill the gear case with a lithium based multipurpose
grease. Insert grease rube nipple into bolt hole of gear case.
Squeeze tube until grease is level with the gear case gasket
surface. Reinstall gear case cover with gasket and tighten bolts
securely. Reinstall bolt with gasket and tighten securely.
CAUTION: Before making any inspections or repairs recommended in this manual, first make
sure the “stop” switch is in the off position and the spark plug cap is removed. These steps will prevent accidental starting
which could result in injury.
5. General Maintenance Items - Good preventative maintenance habits will prolong the life of your
E-Z Tiller. We recommend the following checks after each use: check screws, nuts, and bolts for
tightness; check fuel lines and connections for leaks; inspect and clean fender, tines, and the gear
case. (Note: When cleaning, avoid splashing water on the engine and stop switch.)
6. Tine Replacement - If rocks or other debris become lodged in tines, immediately stop the engine
and clean. CAUTION: Before cleaning, make sure the stop switch is in the off position and the
spark plug cap is removed. This will prevent accidental starting. DANGER- Tines are self-sharpening
and will become quite sharp. Handle carefully. Tines will wear fairly evenly. If tines are being
replaced because of wear, we recommend that all four tines are replaced at the same time. Refer to
p. 7 for installation procedure.
7. (FIG. 18) Carburetor Idle Adjustment - The carburetor has been pre-adjusted at the factory and
normally will not require further adjustment If the engine does not run smoothly at idle speed, first
clean the air cleaner element, fuel filter and check fuel lines. If they are okay, adjust the carburetor
as follows.
a) Start the engine and allow it to warm up for five minutes.
b) Turn the idle speed adjustment screw (1) clockwise or counterclockwise (clockwise increases engine speed, counterclockwise
decreases engine speed) to achieve the correct idling speed. NOTE: If the engine speed is too high, the tines will rotate. If the engine
speed is too low, the engine will stall.
NOTE: A stiff throttle wire may cause high idling speed. Oil/spray the wire when needed. If the wire is still stiff, it may need to be replaced.