k+s 1277 1 #1 Posted May 18, 2016 I have a 7-1251 tiller I put on my 1988 312-8 the belt that was on it is to short, number on the belt is gates hi power II A136,the manual has part number 103635. my question is what size in inches would it be? and will it work with the 312-8? Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,488 #2 Posted May 18, 2016 An A136 should be 1/2" x 138". The 103635 was replaced by 110265 and is 1/2" x 141". i do not know which belt the 1973-1974 model 7-1251 uses when on a 1985 and newer 300-Series tractor. http://www.wheelhorseforum.com/search/?q=%227-1251%22&type=downloads_file The 1986-1989 tiller used was model 07-36TL03 Maybe compare the idler assemblies and pulleys for differences. Garry Share this post Link to post Share on other sites
cleat 4,936 #3 Posted May 18, 2016 According to my notes, the old 'L' shaped belt tensioner/idler assembly uses belt 1599 which is 139". If you have the straight belt tensioner/idler assembly then you use 110265 which is 142". This is a straight belt tensioner/idler assembly. Share this post Link to post Share on other sites
