Service - 78 ST37x Operator’s Manual
50 Hour
50 Hour
Change Engine Oil and Filter (Initial)
Change engine oil after 50 hours. Drain oil (1)
and add 5 qt (4.7 L) of DEO at fill (2).
Change Hydraulic Filter (initial)
Change hydraulic filter after 50 hours.
Location Task Notes
Change engine oil and filter initial service
Check fan belt tension and damage 1/4-1/3” (7-9 mm), initial
Change hydraulic fluid filter initial
Check fuel hose and clamp band
Check radiator/hydraulic fluid cooler for dirt and
debris
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.
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