Engine Maintenance; Servicing The Air Cleaner; Servicing The Engine Oil - Toro STX-38 Operator's Manual

Engine Maintenance

Servicing the Air Cleaner

Service Interval: Every 150 hours—Inspect the primary
filter.
Every 300 hours/Yearly (whichever comes
first)—Replace the primary air filter (more often in
dusty or sandy conditions).
Every 300 hours—Check the inner air filter.
Every 600 hours—Replace the inner air filter.
Note: Check the filters more frequently if the operating
conditions are extremely dusty or sandy.
Removing the Filters
1. Lower the grinder and stop the engine.
2. Remove the key.
3. Release the latches on the air cleaner and pull the
air-cleaner cover off the air-cleaner body
1 2
Figure 29
1. Air-cleaner cover
2. Primary filter
4. Clean the inside of the air-cleaner cover with
compressed air.
5. Gently slide the primary filter out of the air-cleaner
body (Figure 29).
Note: Avoid knocking the filter into the side of the
body.
6. Remove the inner filter only if you intend to replace it.
Important: Never attempt to clean the inner filter.
If the inner filter is dirty, then the primary filter is
damaged. Replace both filters.
(Figure 29).
3 4
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3. Inner filter
4. Air-cleaner body
7. Inspect the primary filter for damage by looking into
the filter while shining a bright light on the outside of
the filter. Holes in the filter will appear as bright spots.
If the filter is damaged, discard it.
Installing the Filters
Important: To prevent engine damage, always operate
the engine with both air filters and the cover installed.
1. If installing new filters, check each filter for shipping
damage.
Note: Do not use a damaged filter.
2. If the inner filter is being replaced, carefully slide it into
the filter body (Figure
3. Carefully slide the primary filter over the inner filter
(Figure 29).
Note: Ensure that the primary filter is fully seated by
pushing on its outer rim while installing it.
Important: Do not press on the soft inside area
of the filter.
4. Slide the cover onto the air-cleaner body and secure it
with the latches

Servicing the Engine Oil

Oil Type: Detergent oil (API service class SJ or higher)
Oil Capacity: with a filter change, 2.9 L (3.06 US qt)
Viscosity: Refer to the following table:
5W-30
°F -20 0
°C -30 -20 -10
Toro Premium Engine Oil is available from your Authorized
Toro Dealer.
Note: Synthetic oils will provide better starting in extreme
cold below -23ºC (-10ºF).
23
29).
(Figure 29).
20W-50
10W-30
SAE 30
20 32 40 50 60 75 80
0 10 20
Figure 30
100
30 40
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