Troubleshooting - Grillo HWT 550 TILT Manual Del Usaurio

TROUBLESHOOTING

The following is a list of small problems which may arise during use of the TRIMMER bush cutter, which
the customer is able to set right unaided:
1. If the engine does not start: proceeding in the order given below, check:
– That the fuel tank is at least half full;
– That the fuel tap is turned on;
– That the choke is engaged (if the engine is cold);
– That fuel is reaching the carburettor;
– That the vent hole on the tank cap is not blocked;
– That the carburettor nozzles are clean. To check them, unscrew them and clean them with an air jet
if dirty;
– That the plug is providing a spark. To check this, remove the plug, reconnect it to the power supply
cable, rest the metal part on an electrical ground and turn the engine pulley as if to start it. If no
spark is seen between the two electrodes, try checking the plug cable connections and if power is
still not received, replace the plug. If the new plug still fails to work, the problem is in the electrical
system, and you should contact your nearest service centre or a specialist workshop.
2. When the lever is engaged the string cup does not turn:
– Adjust the string register (fig. 1 N° 4);
– Make sure that the belt has not come out of its seat on the pulley.
3. The machine does not cut well:
– Make sure that the cutting diameter is at least 300 mm; if it is less than this, replace the strings with
new ones;
– The belt may be slipping: in this case, the clutch wire register can be adjusted or the engine can be
moved back a few millimetres by undoing the three screws on the engine connection flange.
4. The cup keeps turning even when the lever is disengaged:
– Check that the blade brake is working; in this case, undo the M5 nut on the end of the tie-rod (fig.
9) until the pad is touching the surfaces of the driven pulley groove.
– Make sure that material has not accumulated on the brake pad, preventing it from operating;
– The belt may be too tight: undo the clutch cable register (fig. 1 N° 4). If this is not enough, undo the
3 screws on the engine flange and move it forward a few millimetres.
5. For HWT 600 WD only:
– If the travel lever is engaged, but the machine does not move or moves with difficulty, adjust the
belt stretcher cable register (fig. 2 N° 10).
LONG LAY-OFFS
If the machine is to be out of use for a lengthy period, the following precautions should be adopted:
– Drain off the fuel;
– Drain off the engine oil;
– Clean the engine and the bush-cutter thoroughly;
– To prevent problems in the carburettor, use the preservative additive for unleaded petrol.
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