ORIGINAL HYDRO GEAR TRANSMISSION REPLACEMENT IN REPLACEMENT TO TUFF TORQ TORQ MODEL K46S FOR STIGA - GGP - ALPINA CASTELGARDEN MODELS: 1436H 1538H-SD (from 2011), 1540H (from 2011-2013) 1540 H-SD (from 2016-2020), 16. 5/92H (2013) 16/98H (from 2013-2018) , 1640H (from 2013-2020) 1643 H-SD TWIN (2020), 1643 H-SD (2019) 1643 H-SD TWIN (2020), 1740hH TWIN 2020 18.5/108H (2011-2017), 18. 5/108HK (2016-2018) 1843 H-SD (2013), 3600SH (2015) 4000SH (2011-2012) , 4000TH (2012-2013) 98SD hydro B special edition 2018-2019 A 102HB (2011-2012), A 108 HB (2011-2012) A 98HB (2011-2012) ORIGINAL CODE: 118400919/2