Honda HS928 Owner's Manual page 47

If the fluid level is low, add Honda Hydrostatic Fluid.
The use of other hydrostatic fluids will reduce transmission
performance and may damage the transmission. Use only Honda
Hydrostatic Fluid.
1.Unscrew the reservoir cap and remove the seal. Be careful to prevent
dirt, water, or snow from entering the reservoir.
2.Add Honda Hydrostatic Fluid to bring the fluid level to the UPPER
limit mark at room temperature, or to the appropriate level shown in
the temperature chart below. Do not overfill.
3.Reinstall the seal, and tighten the cap securely.
Temp
68°F
Between upper and lower limit marks
(approx. 0.20 in (5 mm) above lower limit marks)
(20°C)
50°F Slightly above lower limit mark
(approx. 0.08 in (2 mm) above lower limit mark)
(10°C)
32°F
Slightly below lower limit mark
(approx. 0.04 in (1 mm) below lower limit mark)
(0°C)
14°F
Between lower limit mark and bottom of reservoir
(approx. 0.16 in (4 mm) below lower limit mark)
(–10°C)
SERVICING YOUR SNOWBLOWER
Fluid level
68°F
50°F
32°F
14°F
UPPER
LIMIT
LOWER
LIMIT
45