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MICRONAIR AU8000 SPRAYER
7.1. Knapsack Mistblower – Routine Maintenance
The mistblower will have a long and trouble-free life if it is kept clean and properly
adjusted. Attention must be given to the following points:
1. Chemical must NEVER be left in the tank or pipework. Always flush out the sprayer
with water or a solvent for the chemical used. Drain cleaning liquid from the sprayer
before storage.
2. Do not leave fuel in the tank or carburettor whilst the sprayer is in storage. After use,
close the fuel valve whilst the engine is running. When the engine stops, drain all
remaining fuel from the tank.
3. Check and clean the engine air filter every 50 hours (or less in dusty conditions). To
clean the filter, proceed as follows:
i) Open the filter casing and remove the foam filter.
ii) Wash the filter in petrol (gasoline).
iii) While still wet, pour about 5 ml of SAE 40/50 oil on the filter and squeeze well in.
iv) Allow all petrol to evaporate.
v) Re-assemble filter in casing.
4. Check and clean fuel filters. Note that the engine has two filters; one at the fuel valve
and one at the carburettor inlet.
5. Check the spark plug every 50 hours. If necessary, clean the spark plug and adjust
the gap setting to 0.4 – 0.5 mm. If the spark plug is damaged, replace with a new
plug of the correct type (see mistblower parts list).
7.2. Possible Engine Faults and Remedies
ENGINE WILL NOT START
Fault Remedy
1. Fuel valve closed Open valve
2. Lack of fuel Add fuel
3. Hole in the fuel tank cap obstructed Open hole
4. Engine flooded See starting instructions
5. Filter in the fuel cock or at the Clean filters
carburettor inlet is dirty
6. Carburettor float needle blocked Clean and check that needle
slides freely
7. Spark Plug contaminated with oil Clean
or carbon
8. Spark plug gap wrongly adjusted Adjust to 0.4 – 0.5 mm