HBW-50 (2:1) was uses on M-12, M2-12, M-18, M3-20, M4-30, M-25 and M-25XP.
Current comparable model from ZF: ZF5M

HBW-100 (1.8:1) was used on M-30, M-35 and M-40.
Current comparable model from ZF: ZF10M

HBW-150 (1.9:1) was used on the M-50.
Current comparable model from ZF: ZF15 Series

HBW-150 V-Drive (2.13:1) was used on all Universal V-Drive models.
Current comparable model from ZF: ZF15 Series

Do not leave gear in forward when sailing. Gear must be in neutral for free wheeling or shifted into reverse to lock propeller while sailing.

Universal Tranmission ATF Fluid Capacity

Purchase the appropriate fluid in our online store.

Generally speaking the smallest gears use about a half a quart of fluid. See the chart below for exact fill capacities. ZF model number shown in brackets.

"HURTH" to "ZF" Model