Big Jake 18 #1 Posted October 23, 2011 I got a1977 C120 I pick up to build a puller. I got it with no motor. I got a K341 16hp I need to know the drive pulley Dia. I need And if not to much to ask the belt size Thanks Jake :dunno: Share this post Link to post Share on other sites
TT-(Moderator) 1,145 #2 Posted October 23, 2011 OEM pulley sizes are 4" OD for the 8 speed models and 5.250" for the hydros. Both used a 5/8" wide belt. Stock belt length for the 8 speed is 81.95" (OEM belt #7473) and the hydro is 84.22" (OEM #7478) A puller might benefit from a different size - or even adjustable - engine pulley to vary the ratio. It's up to you to verify the "legality" within your pulling club / association. Share this post Link to post Share on other sites
Big Jake 18 #3 Posted October 23, 2011 Thanks TT for yor help Jake :dunno: Share this post Link to post Share on other sites
Kelly 1,029 #4 Posted October 24, 2011 Just a side note, if you use a aftermarket pulley be sure to use a iron pulley not a stamped steel one. Share this post Link to post Share on other sites
carlsbarn2 7 #5 Posted November 8, 2011 What speed difference could I expect by going to larger front pulley?I have 310-8 and C-175 8 speed. Share this post Link to post Share on other sites
jonsteffen 6 #6 Posted November 11, 2011 u talk about these ajustable pulleys i don't think i have seen one or if i have i don't rember what it looks like Share this post Link to post Share on other sites
TT-(Moderator) 1,145 #7 Posted November 11, 2011 LINK to an example of an adjustable pulley. Share this post Link to post Share on other sites
Stigian 1,234 #8 Posted December 3, 2011 OEM pulley sizes are 4" OD for the 8 speed models and 5.250" for the hydros. Both used a 5/8" wide belt. Stock belt length for the 8 speed is 81.95" (OEM belt #7473) and the hydro is 84.22" (OEM #7478) A puller might benefit from a different size - or even adjustable - engine pulley to vary the ratio. It's up to you to verify the "legality" within your pulling club / association. Glad I found this thread, I was all set to machine a 4" pulley for my 6X6 project, I didn't know a hydro engine pulley was bigger!! So thanks Terry post posting the above info and thanks to Jake for posting this thread in the first place :thumbs: Share this post Link to post Share on other sites
