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THE HBW 50 TRANSMISSION
General
The HBW 50 transmission is equipped with a positively-driven, mechanically-operated helical gearing sys-
tem. The servo-operated multiple-disc clutch requires only a minimum effort to change drives. This feature
makes the transmission suitable for a single-lever remote control with a rod linkage, such as a Morse or Bow-
den cable. For safety reasons, the transmission is NOT filled with transmission fluid for shipment. Before
leaving the factory, however, each transmission is thoroughly tested with fluid in the transmission. This test-
ing, among other things, provides all internal parts with a coating of transmission fluid. This fluid acts as a
preservative, providing reliable protection against corrosion for at least one year if the transmission is proper-
ly stored.
DIPSTICK/FIll PORT
Lubrication
The HBW 50 transmission is an immersion-lubricated type. Fill the transmission up to or near the top of the
machined notch cut on the dipstick with approximately 0.32 U.S. quarts (0.3 Ikers) of automatic transmis-
sion fluid (ATF).
Change the transmission fluid after the first 30 hours of engine operation and thereafter every 250 hours (or
once per year, minimum). The HBW 50 transmission has a drain plug for draining the old transmission fluid.
To ensure that most of the old fluid is drained from the transmission, run the engine in NEUTRAL for ap-
proximately 10 to 15 minutes so the transmission fluid may warm and flow better from the transmission. This
transmission fluid may also be removed by inserting a small tube through the dipstick opening (where the
transmission fluid is added) and attaching a pump onto the tube so the old fluid may be sucked out.
Westerbeke Diesel Engines
50
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