Toro REELMASTER 4500-D Operator's Manual page 26

CHECKING PLANETARY GEAR DRIVE
Initially, check the oil level after 50 operating hours and check
every 800 hours after that. The oil capacity is approximately
30 oz. (885 ml) high-quality 80–90 weight Gear Lube.
To check the oil level, the oil should be at the bottom of the
check/drain plug hold (Fig. 40) when the hole is placed in the
3 o'clock or 9o'clock position. The traction unit must be on
level ground when making this check.
Figure 38
1. Check/Drain Plug