matzopie 0 #1 Posted May 16, 2021 DRIVE BELT SLIPS OFF RIGHT FRONT IDLER PULLER. TENSION OF BELT IS SET CORRECTLY. BELT LOOSENS THEN SLIPS OFF. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,498 #2 Posted May 16, 2021 Welcome to the forum. If this uses the 6-sided belt are you getting it on correctly? Garry Share this post Link to post Share on other sites
elcamino/wheelhorse 9,046 #3 Posted May 16, 2021 How old is the belt . It may be stretched and needs replacement . Share this post Link to post Share on other sites
Brockport Bill 1,388 #4 Posted May 17, 2021 i have 1989 -- 312-8 with 37 inch side deck --- are you running belt on the inside slot of the p.t.o. drive? if not perhaps that could change belt angle? Just guessing ??? j Share this post Link to post Share on other sites
matzopie 0 #5 Posted May 17, 2021 everything is as it should be. this is happening on a newer deck i bought. i compared the original deck to the newer one and noticed a difference in the front idler pullys. will swap out and see if this solves the problem. Share this post Link to post Share on other sites
rlrnot 39 #6 Posted May 18, 2021 Are you using a 6 sided belt and does your mule drive have 2 vee pulleys? Some 37 inch decks do not use 6 sided belts and consequently have 1 vee pulley and 1 flat pulley on the mule drive. I suppose this could be the issue. Share this post Link to post Share on other sites
dcrage 621 #7 Posted May 18, 2021 (edited) 14 hours ago, rlrnot said: Are you using a 6 sided belt and does your mule drive have 2 vee pulleys? Some 37 inch decks do not use 6 sided belts and consequently have 1 vee pulley and 1 flat pulley on the mule drive. I suppose this could be the issue. AND decks using normal v-belts have FLAT idlers on the deck!! Edited May 18, 2021 by dcrage Share this post Link to post Share on other sites
rlrnot 39 #8 Posted May 18, 2021 That is correct. Decks using 6-sided belts have vee idlers on the deck. Share this post Link to post Share on other sites
