ST37x Operator’s Manual Service - 81
250 Hour
250 Hour
Change Engine Oil and Filter
Change engine oil and filter every 250 hours.
Drain oil (1), change filter (2) and add 5 qt (4.7 L)
of DEO at fill (3). See page 78.
Check Intake Air Line
Check the intake air line every 250 hours.
If the clamp is loose, apply oil to the threads and
retighten it.
If the hose appears cracked or worn, replace it.
Location Task Notes
Change engine oil and filter DEO
Check intake air line
Check fan belt for tension and damage 1/4-1/3” (7-9 mm)
Change hydraulic filter
Check lug nut torque 88-95 ft•lb (108-129 N•m)
Check idler roller bearings
IMPORTANT: Use oil specified in “Engine Oil
Temperature Chart” on page 68.
NOTICE: Keep dust out of the intake air line to
prevent damage to the engine.
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