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Universal Engine Transmissions

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.

   
Model
Capacity in Quarts
HBW 40 (4M) 0.32
HBW 50 (5M) 0.44
HBW 100 (10M) 0.44
HBW 125 (12M) 0.63
HBW 150 (15M) 0.63
HBW 150A (15MA) 0.59
HBW 150V (15MIV) 1.06
HBW 220 (25M) 0.79
HBW 250 (25M) 0.79
HBW 360 1.50
HBW 360A 1.60
HBW 450 1.90
HBW 630 2.10

"HURTH" to "ZF" Model

ZF Model
Old Hurth Model
ZF4M HBW40
ZF5M HBW50
ZF10M HBW100
ZF12M HBW125
ZF15M HBW150
ZF15MA HBW150A
ZF15MV HBW150V
ZF25M HBW250
ZF45C HSW450D
ZF45A HSW450A
ZF45A HSW450A2
ZF63 HSW630H
ZF63A HSW630A
ZF63IV HSW630V