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STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 27
Maintenance
Perform the scheduled maintenance procedures as defined
by Table 8 and below:
DAILY
■ Thoroughly remove dirt and oil from the engine and control
area. Clean or replace the air cleaner elements as neces-
sary. Check and retighten all fasteners as necessary. Check
the gearbox for oil leaks. Repair or replace as needed.
WEEKLY
■ Remove the fuel filter cap and clean the inside of the fuel
tank.
■ Remove or clean the filter at the bottom of the tank.
■ Remove and clean the spark plug (Figure 23), then adjust
the spark gap to 0.024 ~0.028 inch (0.6~0.7 mm). This unit
has electronic ignition, which requires no adjustments.
ENGINE OIL
1. Drain the engine oil when the oil is warm as shown in
Figure 24.
2. Remove the oil drain bolt and sealing washer and allow
the oil to drain into a suitable container.
3. Replace engine oil with recommended type oil as listed
in Table 7. For engine oil capacity, see Table 2 (engine
specifications). DO NOT overfill.
4. Install drain bolt with sealing washer and tighten securely.
Figure 24. Engine Oil (Draining)
Figure 23. Spark Plug Gap
STOW MS-93 PLASTER/MORTAR MIXER — MAINTENANCE (ENGINE)
ENGINE AIR CLEANER
1. Remove the air cleaner cover and foam filter element as
shown in Figure 25.
2. Tap the paper filter element (Figure 25) several times on
a hard surface to remove dirt, or blow compressed air [not
exceeding 30 psi (207 kPa, 2.1 kgf/cm
2
)] through the filter
element from the air cleaner case side. NEVER brush
off dirt. Brushing will force dirt into the fibers. Replace the
paper filter element if it is excessively dirty.
3. Clean foam element in warm, soapy water or nonflammable
solvent. Rinse and dry thoroughly. Dip the element in clean
engine oil and completely squeeze out the excess oil from
the element before installing.
Figure 25. Engine Air Cleaner
DO NOT use gasoline as a cleaning sol-
vent, because that would create a risk of
fire or explosion.
DANGER
Explosive
Hazard