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Yanmar Pleasure Boat Marine Engine Help

Transmission (Gearbox) Codes and Information

Most Yanmar's have a Kanzaki transmission fitted however some models (4JH3/4JH4/4LHA/6LPA/6LY) are supplied with ZF Hurth or Twin Disc transmissions depending on model. Most engine models have various transmission options, Discuus with your dealer the most suitable unit for your particular requirements.
V-drive models are not sold in all global markets (not sold the UK market).
Kanzaki is a wholly owned Yanmar subsidiary, visit their English language WEBSITE.

CAUTION: When checking the transmission oil quantity, sit the dipstick on the threads regardless of model, do not screw it in.
SD20/31 do not run before dipping otherwise oil may be aerated which can be misleading, looking as if oil is emulsified. Twin Disc models check oil level with engine idling. Hurth hydraulic models run engine then dip immediately after stopping.

Model code
Description
Oil type
Oil Quantity
KBW10E
multi plate clutch up to 48hp (except 2.83:1) #
ATF*
0.7 litre
KBW20
As above, up to 62hp. #
ATF*
1.2 litre
KBW20-1
As above, with adapter plate to fit 4JH3E #
ATF*
1.2 litre
KBW21
As above, up to 100hp. #
ATF*
1.2 litre
KM2P
cone clutch, parallel output shaft
same as engine
0.3 litre
KM3A-1
cone clutch, 7deg down angle output shaft
same as engine
0.45 litre
KM3P
Servo-cone clutch, parallel output shaft
same as engine
0.35 litre
KM3P4
As above, with adapter for 3JH3E and 4JH3E
same as engine
0.35 litre
KM35P
Heavier version of KM3P
same as engine
 
KM35A
Heavier version of KM3A fitted to 3JH4E
   
KM35A2
Heavier version of KM3A fitted to 4JH4E
same as engine
 
KM3V
cone clutch, ' v ' output shaft 15deg angle
SAE30 engine oil
0.8 litre
KM4A
cone clutch, 7deg down angle output shaft
SAE30 or engine oil
1.3 litre
KM4A1
As above, with adapter plate for 4JH3E
SAE30 or engine oil
1.3 litre
ZF 30 M
(2003/4) replaces KBW20-1 & KBW21 mechanical multi plate clutch fitted to 4JH4E & 4JH3 range
ATF*
 
KM5A
cone clutch, 7deg down output shaft
SAE30HD oil
2.1 litre
HSW 630A1 or ZF 63 A
hydraulic multi plate clutch
ATF*
approx 4.5 litre
KMH4A
Hydraulic clutch, 8deg down angle output shaft
Hydraulic oil
2.0 litre
KMH6A
Hydraulic clutch, 8deg down angle output shaft
Hydraulic oil
4.0 litre
KMH6A1
Hydraulic clutch, 8deg down angle output shaft
Hydraulic oil
4.0 litre
SD20
Saildrive leg. Dog clutch GM/YM series engines
SAE80w/90 gear oil**
2.2 litre***
SD31
As above but heavier duty, JH series up to 56hp
SAE80w/90 gear oil**
2.2 litre***
SD40
Saildrive Cone clutch 3JH3CE, 4JH3CE, 3JH4CE ,4JH4CE
'Quicksilver'
High Performance Gear Lube.
min 1.8 litre see below****
SD40-T
As above but heavier duty, 4JH3-TCE 75hp
'Quicksilver'
High Performance Gear Lube.
min 2.1 litre see below****
YX-70S
Hydraulic clutch, parallel output shaft
Hydraulic oil
5.0 litre

* ATF Automatic Transmission Fluid

** Except 1GM10C use engine oil

*** 2.6 litres with the optional long reach saildrive extension

**** CAUTION SD40/SD40-T units: The maximum oil level should be re-marked on the dipstick 35mm above the current maximum marking and the oil level should be maintained as near to the maximum as possible (but not higher). This change in oil level is the subject of Yanmar technical bulletin MSB 03-017 (click for .pdf diagram). The oil is best pressure filled from the external drain or internal filler hole using MerCruiser gear oil pump or similar device. Oil can be pumped out & re-filled afloat from inside the boat. I only recommend the use Quicksilver High Performance gear Lube which is available from Yanmar Power centres, Mercury & Mercury MerCruiser Dealers and certain handlers.

# These models can have a stiff/heavy gear selection& vague neutral selection use "Morse Supreme" or equivalent low friction 33c type cables

CAUTION Hydraulic gearboxes require additional oil for the remote mounted oil cooler so the quantity required may vary. This cannot be calculated until the unit is completely installed.

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