Honda Pioneer 1000 2017 Owner's Manual page 169

The recommended sub-transmission oil is the same as the engine oil
(page 149).
Refer to Safety Precautions on page 123.
Check the sub-transmission oil level each day before operating your
Honda SXS and add, if needed.
Before riding your SXS, check the sub-transmission oil level.
1. Park your Honda SXS on a firm, level surface.
2. Remove the front seat (page 139).
3. Remove the oil fill cap/dipstick from the transmission cover and
wipe it clean.
4. Insert the dipstick without screwing it in, then remove the oil fill
cap/dipstick and check the oil level. The oil level should be
between the upper level mark and the lower level mark on the oil
fill cap/dipstick.
(cont'd)