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Owner’s Manual
THT-210/210S/2000/2100/2120/2520, THT-240/2510/2530/2540/262
HTD-2520PF/2522PF/2526PF/2530PF, HTS-2530PF
5. Maintenance
MAINTENANCE, REPLACEMENT, OR REPAIR OF THE
EMISSION CONTROL DEVICES AND SYSTEMS MAY
BE PERFORMED BY ANY NONROAD ENGINE REPAIR
ESTABLISHMENT OR INDIVIDUAL.
Carburetor adjustment (Fig. 3-1, 1B)
WARNING!
Never start the engine without the complete clutch cover! Otherwise the clutch can come loose and cause personal injuries.
In the carburetor, fuel is mixed with air. When the engine is test run at the factory, the carburetor is basically adjusted. A
further adjustment may be required, according to climate and altitude. The carburetor has one adjustment possibility:
T = Idle speed adjustment screw.
Idle speed adjustment (T)
Check that the air filter is clean. When the idle speed is correct, the cutting attachment will not rotate. If adjustment is
required, close (clockwise) the T-screw, with the engine running, until the cutting attachment starts to rotate.
Open (counter-clockwise) the screw until the cutting attachment stops. You have reached the correct idle speed when the
engine runs smoothly in all positions well below the rpm when the cutting attachment starts to rotate.
If the cutting attachment still rotates after idle speed adjustment, contact your service workshop.
Air filter (Fig. 3-2, 2B)
The air filter must be cleaned from dust and dirt in order to avoid:
• Carburetor malfunctions.
• Starting problems.
• Engine power reduction.
• Unnecessary wear on the engine parts.
• Abnormal fuel consumption.
Clean the air filter daily or more often if working in exceptionally dusty areas.
Cleaning the air filter
Remove the air filter cover and the filter (1).
Rinse it in warm soap suds. Check that the filter is dry before reassembly. An air filter that has been used for some time
cannot be cleaned completely. Therefore, it must regularly be replaced with a new one. A damaged filter must always be
replaced.
WARNING!
The blades may be moving during carburetor adjustments.
NOTE!
Saturate the element in 2-cycle oil or the equivalent. Squeeze the element to distribute the oil completely and to remove any
excess oil.
