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#1
07-09-2015, 11:38 AM
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PTO Belts slipping on 3100
Recently purchased a 3100 with 365 hours. Runs great, great condition, but the pto belts slip while mowing. I installed new belts, but they still slip while mowing at anything other than a snail's pace!
The Vacuum Actuator seems to be working correctly and I've had the deck (394/50") off to sharpen blades and grease. Deck seems to be in good working order. I would like to check vacuum, but I have no idea what the number should be.... Help!!!!! 
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#2
07-11-2015, 09:48 AM
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did you install the correct length belts 1/2"x 37 5/8" if you used 38" long they won't be tight enough..take the pto shaft off for safety and turn the pto on laying in front of the tractor you'll be able to see if the belts are tightening up
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#3
07-11-2015, 09:58 AM
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Not sure if the deck is similar to the 2000 series, but when I had that tractor there was a spring loaded idler on the deck itself that was stiff to move, that was the main tensioner and needed cleaning up on the bushing it rode on to let the spring fully extend it.
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#4
07-11-2015, 10:44 AM
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Quote:
__________________
2264 with 54 GT deck 1641 AKA Black Jack with a 402-E Haban Sickle bar mower JD317 dump truck BX2670 with FEL
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#5
07-11-2015, 01:41 PM
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True, this is a pto to belt to shaft drive mower where there is that idler you mentioned.
But then there is another idler on the deck itself because the deck is driven by shaft from tractor but it has its own belt same as all decks that drive each spindle. There is a spring loaded idler there. Check that one. I am thinking you have the 50" deck 190-394 deck. Check partstree diagram for that idler, it's #25.
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#6
07-11-2015, 01:48 PM
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Quote:
__________________
2264 with 54 GT deck 1641 AKA Black Jack with a 402-E Haban Sickle bar mower JD317 dump truck BX2670 with FEL
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#7
07-11-2015, 01:57 PM
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Sam, The one you pointed out could be the culprit. To the OP, there are those 2 belts, see which one has slack in it and go from there. Depending on which one it is, look at the tension idler or the belt itself.
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#8
07-22-2015, 09:46 AM
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Idler pulley working. Its the vacuum. After engaging the pto, I can remove the side panel and physically pull on the idler bracket, and the deck comes up to full speed and maintains until the pto is disengaged.
This makes me believe the actuator isn't receiving enough vacuum.
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#9
07-22-2015, 10:05 AM
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In other words.....
The Actuator engages when the PTO is turned on. However, it doesn't fully engage (maybe 80%). When the Idler Bracket is pulled, the belts fully tighten, and the deck comes up to full speed. I have a Vacuum Gauge, and if I knew the amount of vacuum the Actuator should be receiving, I could see what the culprit is. The correct PTO Belts are installed.
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#10
07-22-2015, 11:36 AM
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Quote:
Also check the pivot on the idler that the vacuum activates, it might need lube. as you say once it it pulled against the belt it seems to stay there. Take your gauge and check vacuum @ the source, Manifold? Then @ the motor(#23) while activated, that ought to tell you if you have a leak
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