Service - 88 ST37x Operator’s Manual
As Needed
Power Unit
Change Air Filter
Change air filter when red band on indicator (1) is
visible. Replace secondary element (4) every
third change of primary element (3) or any time
primary element has become damaged.
1. Open air filter housing at latches (2).
2. Remove primary element (3).
3. Wipe inside of housing and end cup (2) and
clean dust ejector valve.
4. Insert new secondary element if necessary
and ensure it is seated correctly.
5. Insert new primary element.
6. Latch air filter housing with dust ejector facing downward.
7. Reset air filter service indicator.
Drain Water Separator Filter
Drain water separator filter when red float ring is
raised, indicating water in the filter.
1. Turn off at valve (1).
2. Unscrew drain plug (2) at bottom and drain
water out.
3. Tighten drain plug.
4. Turn on at valve.
NOTICE: Only open the air filter housing when red band on indicator is visible. Change the elements. Do
not attempt to clean them.
• Improperly installed primary element can lead to premature engine failure.
• Compressed air or water may damage filter elements.
• Tapping filter elements to loosen dirt may damage the elements.
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