Cub Cadet Trans Asm-Ezt Hydr - 918-04431B

Cub Cadet / Troy-Bilt / MTD Transmission (LH) – Left Hand (OEM)

Part Number: 918-04431B
Description: Transmission (LH)
Condition: New OEM Part
This part replaces: 618-04431, 618-04431A, 618-04431B, 918-04431, 918-04431A

The Cub Cadet / Troy-Bilt / MTD Left-Hand Transmission (918-04431B) is a genuine OEM hydrostatic transmission assembly designed for select RZT, ZT, and ZTL series zero-turn mowers. This left-hand (LH) transmission restores smooth ground speed control, dependable drive power, and consistent performance—ideal for replacing a worn, weak, or failed drive unit.

If your mower is slipping, losing power, or not driving correctly on the left side, replacing it with a new OEM transmission ensures proper fitment and factory-level reliability.

Key Features

• New OEM hydrostatic transmission

• Left-Hand (LH) transmission assembly

• Restores smooth drive control and responsiveness

• OEM replacement for correct fit and long service life

• Fits select Cub Cadet / Troy-Bilt / MTD zero-turn mowers

Compatible Models (Fitment List)

RZT42 Models

• RZT42 Kohler – 17AE2ACG010 (2010)

• RZT42 Kohler – 17AF2ACS010 (2011)

• RZT42 Kohler – 17WF2ACS009 / 17WF2ACS010 / 17WF2ACS056 (2011)

• RZT42 Kohler – 17YF2ACS010 (2012)

• 17AC2ACS058 (2012) – MZ2142 / RZT-42

• 17AC2ACS058 (2013) – MZ210-42 / RZT42

• 17AF2ACS004 (2012) – RZT-42

• 17AJ2ACG597 (2008) – RZT-42

• 17AJ2ACG897 (2009 / 2010) – RZT42

• 17AE2ACG011 (2008) – Mustang / Colt RZT 42

• 17AE2ACG066 (2008) – Mustang / Colt RZT 42

• 17AE2ACG211 (2008) – Mustang / Colt RZT 42

RZT50 Models

• RZT50 Kawasaki – 17AI2ACP009 / 17AI2ACP010 / 17AI2ACP056 / 17AI2ACP256 (2009)

• RZT50 Kawasaki – 17AI2ACP010 / 17AI2ACP056 / 17WI2ACP010 / 17WI2ACP056 (2010)

• RZT50 Kawasaki – 17AI2ACP010 (2011)

• RZT50 Kawasaki – 17WI2ACP010 / 17WI2ACP056 (2011)

• RZT50 Kohler – 17AF2ACP010 (2011)

• RZT50 Kohler – 17WF2ACP009 / 17WF2ACP010 (2011)

• 17AF2ACP004 (2012) – RZT-50

• 17AF2ACP066 (2012) – Mustang XP

• 17AF2ACP897 (2012) – ZT50

• 17AK2ACP597 (2008) – RZT-50

• 17AK2ACP897 (2009 / 2010) – RZT50

• 17BK2ACP597 (2008) – RZT-50

• 17WF2ACP011 (2012) – Mustang XP

• 17AF2ACP011 (2008) – Mustang RZT 50

• 17AF2ACP066 (2008) – Mustang RZT 50

• 17AF2ACP211 (2008) – Mustang RZT 50

• 17AF2ACP711 (2007) – Mustang RZT 50

• 17AF2ACP766 (2007) – Mustang RZT 50

RZT17 / RZT22

• RZT17 – 17AA5A4G710 / 17AA5A4G712

• RZT22 – 17AA5A7P710 / 17AA5A7P712

• ZT-17 (2004) – 17AA5A4G790

• ZT-22 (2004) – 17AA5A7P790

ZT Series (ZT-42 / ZT-50)

• ZT-42 (2005) – 17BA5A4G790

• ZT-42 (2006) – 17AA554G790

• ZT-42 (2008) – 17AJ2ACG090

• ZT-50 (2005) – 17BA5A7P790

• ZT-50 (2006) – 17AA557P790

• ZT-50 (2008) – 17AK2ACP090 / 17AK2ACP290

• ZT-50 (2008) – 17BK2ACP090

• ZT50 (2013) – 17AF2ACP897

ZTL Series

• ZTL7000 (247.25002) – 17AK2ACP099 (2012 / 2013)

• ZTL7000 (247.25001) – 17AK2ACS099 (2012 / 2013)

ZT-4200 / ZT-5000

• ZT-4200 (2007) – 17AC2ACG790

• ZT-5000 (2007) – 17AD2ACP790

Additional Fitments Provided

• 17AA5AAG766 (2006) – RZT 42

• 17AA5ABP766 (2006) – RZT 50

• RZT-42 (2006) – 17AA554G755

• 17AA5AAG700 (2008) – RZT-42

• 17AC2ACG004 (2008) – RZT-42

• 17AD2ACP004 (2008) – RZT-50

Notes

• Left-Hand (LH) transmission only (LH = left side when seated on mower)

• Fits select Cub Cadet / Troy-Bilt / MTD zero-turn mowers

• Always verify part number and model number before ordering

• Professional installation is recommended