Question about Husqvarna 23 Hp 48" Deck Yard Tractor

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I have a Husqvarna CTH 171. When i engage the blades they

I have a CTH 171. When i engage the blades they will not run. I have checked all pulleys and the belt but the appear ok. What is the problem ?

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Http://weborder.husqvarna.com/order_static/doc/HO/HO2005/HO2005_5321938-34.pdf
This is the owners manual if you do not have one.
There is a brake on the pulley, make sure that is not hanging up.
Please let me know what you find.

Posted on Feb 08, 2010

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Does the lever that engages the blades have pressure on or does it feel loose. It is possible that the linkage from the lever to the idler pulley has come off. Raise the hood and watch the lever as it is engaged and disengaged there shold be somekind of linkage moving a pulley in and out to tighten the belt so the blades will turn. hpope this helps

Posted on Mar 03, 2010

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I have a 52" Husqvarna LGT 2654 riding lawn mower and when I engage the blades, the belt does not turn the pulley system. What could be causing this, the pulley idlers, or the belt?


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when you actuate the "engage blade" lever, two things may occur,
First, a mechanical action, a spring moves to put tension onto the belt.
Second; at the end of its run, actuate a switch (PTF switch) to engage the clutch that moves the pulleys that consequentially move the blades.
if the tensioner is not moving , check if spring has come lose, undone or broken, (more likely in your case) or check the PTF switch.
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Try reducing the speed selector. This is equivalent to running in a lower gear. Your tractor works hard just to turn the blade. Going uphill requires additional power, so some reduction in speed is to be expected.

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1 Answer

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The seat switch is has a shunt in the circuit that must be satisfied in order for the rest of the circuit to be happy. Make sure the connections are good, the pins inside the amp connectors will sometimes spread, push out of the lock etc. and if connection is lost will not work. Otherwise a new seat switch will be needed. You might check the PTO switch for continuity, without a diagram or schematic I am not sure how your circuit is wired. you have to have the parking brake engaged to get off the mower while the engine is running and the PTO is Dis-engaged?
I don't know if your "go" pedal eliminated this switch or not. But if with the parking brake engaged and the PTO disengaged, you lift off the seat and it dies, then its the seat switch.

Hope this helped Tim

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