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15
MAINTENANCE
14.Hydraulic filter and oil: Change every 500 hours or yearly. Stop engine and remove key.
Clean around the filter and the drain plug on the bottom side of the tank. Remove the
filter and allow any oil to drain from the filter head. Then replace with new filter. Use only
Yazoo/Kees p/n 102606, filter which has a bypass valve and the correct micron filter.
Remove the cap nut from the bottom of the tank and allow the tank to drain, reinstall the
cap nut. Fill tank with 15w - 50 mobil1, 1” below the fill tube and replace cap. Block up
the rear of unit until wheels will rotate freely and start engine at a slow idle, move the
control levers forward and run for several minutes. Stop engine and recheck oil level. If
wheels don’t respond an air lock has occured within the hydraulic system. Bleed air
from lines, or let stand overnight to allow the air to dissipate out of the oil. Retry re-
sponses & check the oil level.
Note: Serious damage to the pumps and wheel motors can occur if the system is run with an
air lock.