Old mower 5 #1 Posted September 16, 2020 I am trying to replace a drive belt on a 1986 Wheelhorse model 73421, serial 4900732. The 42" deck is model 78345, serial 4901676. The old belt broke and popped off the pulleys and I need help to locate a diagram for attaching the new belt. My attempts to install the new belt from memory didn't work well as can be seen in the pics Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,621 #2 Posted September 16, 2020 Here is the last manual for this deck. Yours is a 1994 model. Garry 1 Share this post Link to post Share on other sites
daveoman1966 3,645 #3 Posted September 17, 2020 First of all, the belt MUST be on the innermost 'V' of the Engine PTO Pulley. it then makes one loop thru the inside 'V' idler of the front mule drive, to the center pulley of the deck, then back around the outside flat idler, and then back to the PTO pulley. It is shown on the deck set up manual. 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,621 #4 Posted September 17, 2020 Looks like you have taken the pto yoke apart to get the belt on the pto pulley. That is not necessary. Look at page 19 of the above manual for instructions. Removing pins #1 (x2) and #4 will allow the yoke to drop down out of #3 the engagement plate so it can be swung out of the way to get the belt on. Keep us posted on your progress. Garry Share this post Link to post Share on other sites
953 nut 52,616 #5 Posted September 17, 2020 Looks like Garry and Dave have this covered for you. Any other questions that may come up please feel free to ask. Share this post Link to post Share on other sites
Old mower 5 #6 Posted September 17, 2020 4 hours ago, gwest_ca said: Looks like you have taken the pto yoke apart to get the belt on the pto pulley. That is not necessary. Look at page 19 of the above manual for instructions. Removing pins #1 (x2) and #4 will allow the yoke to drop down out of #3 the engagement plate so it can be swung out of the way to get the belt on. Keep us posted on your progress. Garry 1 Share this post Link to post Share on other sites
Old mower 5 #7 Posted September 17, 2020 Many thanks Dave. Your description is just what I needed. Garry, thanks for your directions on the yoke. I won't be able to work on the belt until this evening, and will let you know how it goes. 1 Share this post Link to post Share on other sites
Old mower 5 #8 Posted September 17, 2020 Many thanks Dave. Your description is just what I needed. Garry, thanks for your directions on the yoke. I won't be able to work on the belt until this evening, and will let you know how it goes. 1 Share this post Link to post Share on other sites
Old mower 5 #9 Posted September 17, 2020 Dave, I put the deck back on the tractor and followed your directions for attaching the drive belt with no problem. However, when I started the tractor and tried to engage the PTO, the lever had no resistance when moved forward and did not engage. The linkage had been detached, but I reattached it exactly as it was. There may be a simple answer to this, but I sure can't find it. Thanks, Steve 1 Share this post Link to post Share on other sites
wallfish 16,170 #10 Posted September 17, 2020 (edited) Best to replace that clip pin with a small bolt and nut. To release the hoop again, just undo the other pin clip (which is why it's made like that) and the hoop will swing out of the way. It's tool-less when set up properly Edited September 17, 2020 by wallfish 1 Share this post Link to post Share on other sites
daveoman1966 3,645 #11 Posted September 17, 2020 (edited) Here is a schematic of how the PTO HOOP... has to be connected to the outer STUB shaft (#33) of the PTO assembly shaft. The hair pins in your pics are completely wrong. That little square bracket (CLEVIS--#49) s/b connected to the PTO Hoop (#31) with a ROLL PIN (#30). Then the Clevis is connected to the STUB shaft (#33) with a pin that has a locking spring on it (#28) (the black thingy in your pic). Edited September 17, 2020 by daveoman1966 1 Share this post Link to post Share on other sites
Old mower 5 #12 Posted September 18, 2020 Thanks Daveoman and Wallfish. All very clear and I'm on it. Will let you know. May need some parts. Share this post Link to post Share on other sites
Old mower 5 #13 Posted September 18, 2020 Dave, I put the deck back on the tractor and followed your directions for attaching the drive belt with no problem. However, when I started the tractor and tried to engage the PTO, the lever had no resistance when moved forward and did not engage. The linkage had been detached, but I reattached it exactly as it was. There may be a simple answer to this, but I sure can't find it. Thanks, Steve Share this post Link to post Share on other sites
Old mower 5 #14 Posted September 18, 2020 Dave, I got things connected per the schematic you sent and the PTO now works fine. Duh, I can only claim old age and memory loss for forgetting how I had taken the linkage apart in the first place. Thanks again to you, Wallfish, and Garry for your help. Red Square is a great forum. Old Mower 1 Share this post Link to post Share on other sites
wallfish 16,170 #15 Posted September 19, 2020 (edited) If not already done. This configuration is spinning the deck blades in the wrong direction so also flip the belt loop on the deck as well Edited September 19, 2020 by wallfish 1 Share this post Link to post Share on other sites
