Toro Wheel Horse 523Dxi Operator's Manual page 55

PROBLEM
The engine runs, but knocks or
misses (continued).
The engine will not idle.
The engine overheats.
POSSIBLE CAUSES
3. There is air in the fuel.
4. The injection nozzles are
faulty.
5. Low compression
6. The injection pump timing is
incorrect.
7. Excessive carbon build–up.
8. Internal wear or damage.
1. The fuel tank vent is
restricted.
2. Dirt, water, stale fuel, or
incorrect fuel is in the fuel
system.
3. The idle speed adjusting
screw is incorrectly set.
4. The fuel pump is faulty.
5. Low compression.
6. The air cleaner element is
dirty.
7. The fuel filter is clogged.
8. There is air in the fuel.
1. More coolant is needed.
2. (3) air intake screens are
dirty.
3. Restricted air flow to the
radiator.
4. Radiator fins are dirty.
CORRECTIVE ACTION
3. Bleed nozzles and check for
air leaks at the fuel hose
connections and fittings
between the fuel tank and
engine.
4. Contact your Authorized
Service Dealer.
5. Contact your Authorized
Service Dealer.
6. Contact your Authorized
Service Dealer.
7. Contact your Authorized
Service Dealer.
8. Contact your Authorized
Service Dealer.
1. Contact your Authorized
Service Dealer.
2. Drain and flush the fuel
system; add fresh fuel.
3. Contact your Authorized
Service Dealer.
4. Contact your Authorized
Service Dealer.
5. Contact your Authorized
Service Dealer.
6. Clean or replace.
7. Replace the fuel filter.
8. Bleed the nozzles and check
for air leaks at the fuel hose
connections and fittings
between the fuel tank and
engine.
1. Check and add coolant.
2. Clean with every use.
3. Inspect and clean the radiator
screen with every use.
4. Clean the radiator fins.
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