Yanmar 1GM User Manual page 222

Chapter Eleven
Transmission-KBW Series
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This chapter covers the Kanzaki Hurth KBWlOD and
KBWIOE marine transmissions that are attached to
Yanmar 3GM, 3HM and 3HM35 engines. Refer to Table
1 for a cross-reference ofengine and transmission models.
The identification plate (Figure 1) located on the trans-
mission case specifies the transmission model.
The KBWlO series transmissions covered in this chap-
ter are inline transmissions that provide forward and re-
verse direction. All gears are constant mesh. A plate-type
clutch engages the gears to transmit power to the output
shaft. Oil contained in the transmission case lubricates the
internal transmission components.
Refer to Chapter Three for maintenance information.
Tables 1-3 are located at the end of this chapter.
OPERATION
The input shaft on the transmission engages the drive
disc attached to the engine flywheel. Because this is a con-
stant-mesh transmission, engine power is transmitted to
all gears. Power flows to the output shaft when the clutch
engages either the forward gear or the reverse gear. The
clutch contacts a clutch pack of several discs adjacent to
the forward and reverse gears. In Figure 2, the clutch is
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MARINE GEAR MODEL KBW 10
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shown engaged with the forward gear. Because power
flows from the input shaft gear through the reverse idler
gear to the reverse gear, the reverse gear rotates in the op-
posite direction of the forward gear. When the clutch en-
gages the reverse gear, the output shaft rotates in reverse.
Moving the shift lever rotates the shift shaft. When the
shift shaft rotates, the shifter fork slides the shift ring into
engagement with the forward or reverse gear clutch. The
drive hub on the output shaft transfers power from the se-
lected clutch to the output shaft.