MaxN Posted November 1, 2003 Posted November 1, 2003 Hi I recently added ag tires to the rear of my tractor. My tractor has a front end loader and when pushing a load of dirt the main drive belt off the bgb slips. I need to drop it down to second to keep the wheels turning. Before the ag tires I did not have, or at least notice, this problem. I currently have about 200lbs of weight on the back for traction. Am I just overwhelming the ability of the belt? Should the belt be capable of gripping to the point of stalling the engine? I just installed two new drive belts(the one that is slipping is a napa heavy duty fhp belt), but is still slipping. Double checked for grease on the belts but found none. Any tricks to adjusting the belts? Both drive belts seem to long, but are both the lenghth stated on the simple tractor website (34" and 53"). I've been following the adjusting procedure from the owners manual. Thanks
rokon2813 Posted November 1, 2003 Posted November 1, 2003 You might just be overworking the ability of the belt. Or it could be the Napa belt versus Simplicity belts. The second would be my guess but its only a guess. It may even be a combination of several things, slightly worn belts, slightly weakened springs, too much traction and too high a gear. Even on a shuttle I dont think I would try to push dirt in third gear, but thats only my opinion too.
Salthart Posted November 1, 2003 Posted November 1, 2003 In my opinion, the slipping belt has likely saved you a broken tractor.
Al Posted November 1, 2003 Posted November 1, 2003 Hi, with all of the weight, you may be pushing the limit on the axle etc. The most common cause of slippage we have seen on this family of tractors from the 3400 to Sovereign has been wear on the sides of the v pulley on the bevel gear box. The pulley gets worn like a U rather than a V and then the "pull" is primarily from the inside corners on the bottom of the belt. We have replaced a number of these pulleys for this problem. Next I would use the genuine belt. V pulleys get their pull from the action of the bend. When the belt goes into the pulley the sides are against the side of the pulley. As the belt wraps around the pulley, the sides of the V are squished out due to the wrap of the belt. This pressure squeezes against the pulley providing great grip. As the belt comes off the other side of the pulley when it straightens out, the squeezed out part compresses again because the belt is straightening. This releases the grip on the side of the of the pulley. This action causes wear on the side of the pulley. When the sides wear, there is no straight side for the belt to wedge against. I would expect if you examine this pulley you will find the problem. My 2 cents worth, its free value accordingly. Al Eden
fuzy Posted November 1, 2003 Posted November 1, 2003 I would agree with al. One thing to keep in mind with aftermarket belts is that they may not have exactly the correct dimensions. I mean everything from length to width and even the angles of the sides of the belts. If you are off a few degrees then only a tiny portion of the side walls really are taking the load and it's going to slip. John
Roy Posted March 20, 2004 Posted March 20, 2004 I am replying to this post because it is related to a problem I have with my 7013S. Went to put a new belt on from the BGB to the shuttle drive pully today. Found it is too long. Checked the part number and it is correct (P.N. 174731, 53.1" long). Per Al's post, the front pulley may be worn so will check it but the belt seems to sit in the front pulley OK. But, the belt sits low in the large rear pulley. Looked in the parts manual and it appears the rear pulley may be a split pulley. If so, and it has spread, then the belt would ride low and be too long. I also looked to see if the idler pulley could be adjusted to account for the long belt but do not see any adjustments. My B-1 has several holes for the idler pulley so it can be moved to account for belt stretch, etc. So, the question is, does anyone have experience with this problem and/or the large drive pulley? Is it a split pulley? Can it be the problem? Where do I go from here? Thanks,
Al Posted March 20, 2004 Posted March 20, 2004 Hi, One comment I would like to make. Note FHP belt. FHP stands for fractional horsepower belts. This implies less than 1 hp. Just thought I would mention it. Al Eden
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