Bad Boy 2011 - Hydrostatic System; Hydrostatic Oil Change Procedure

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SECTION 1: HYDROSTATIC SYSTEM
To change hydro oil on Pup, Lightning, AOS, and Diesel models,
remove oil return lines from top of hydro tank and place them in a
disposable oil container. Start and run mower until oil level is
reduced down to about 2” of oil remaining in the tank. Do not allow
air to enter the oil lines in the bottom of the tank. Keep in mind that
only about 75% of the hydro oil can be changed at a time. Use only
20w50 motor oil in the hydro system.
(conventional or synthetic oil may be used)
Bad Boy recommends that the hydro oil and filters be changed within
the first 50 hours of usage and every 500 hours thereafter or once a
year.