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GB - 13
25 Hours
or Every
Season
Check Battery Keep battery and battery terminals clean (see
Cleaning
Battery and Battery Cables
on page 20).
Lubricate Unit Apply grease to two front
wheel zerks, steering
gear, and pinion.
Clean Air Filter
1
Clean air filter (item 2). Refer to Engine Manual for detailed
instructions.
50 Hours
or Every
Season
Change Engine Oil
2
Drain engine oil by opening oil drain petcock (item 6). Refer
to Engine Manual for detailed instructions.
Check Fasteners Check mower blade mounting hardware and all other
fasteners. Replace fasteners that are missing or damaged.
Tighten all nuts and bolts to the correct torque value.
Inspect Muffler and
Spark Arrestor
Replace muffler (item 5) and spark arrestor (if equipped) if
corroded. Contact your Gravely Dealer.
100 Hours
or Every
Season
Replace Spark Plug Replace spark plug (item 4). Refer to Engine Manual for
detailed instructions.
Replace Fuel Filter Replace fuel filter (item 3). Refer to Engine Manual for
detailed instructions.
Clean Cooling
System
1
Clean cooling system (item 1). Refer to Engine Manual for
detailed instructions.
Check All Belts Replace worn or deteriorated belts.
• Check hydrostatic belt (see Hydrostatic Belt
Replacement on page 21).
• Check PTO belt (see PTO Belt Replacement on
page 21).
• Check mower belt (see Mower Belt Replacement
(927064) on page 22).
1
Service more often when operating under heavy loads, high temperatures, or dusty
conditions. Replace air filter if very dirty.
2
Change after first 5 to 8 hours of use. Change every 25 hours when operating under heavy
loads or in high temperatures.
Interval Task Action
Zerk
Steering
Gear and
Pinion
Zerk