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When last was it properly serviced. A good service might just have it running good again. If the engine has done a lot of running/work it might need a overhaul as it will lose power over time due to normal wear and tear causing it to die when a load is applied. (Lack the power to overcome the initial inertia required the get everything moving.)
try to engage the blades with the engine off and check the tension of the belts...they can be too tight causing too much torque on the pulleys and extra strain on the engine.
Did the smoking stop when you disengaged the blades? If so it is most likely your belt that is smoking. Make sure all the blades turn freely by hand to ensure you have not hit anything that may have bent a shaft on one of the blades. If one of the shafts is bent and wont turn FREELY, the belt driving the blades would slip and start smoking as it tried to turn them.
Does engaging the pedal for the PTO lug the engine down, or does it just die like turning off the key?
If it lugs the engine down, then you need to make sure you can spin the
spindle and idler pulleys by pulling the belt by hand. You should be
able to slip it around the engine pulley enough with the blade pedal
disengaged. Pull the belt up tight so the slack is around the engine
pulley and try to spin the blade spindle and idler pulleys.
If it dies like turning off the key, then its likely a safety switch and may require a meter to test which.
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.
well yep it is,,,look at the deck first to check its not tight to turn look for sezed up bearings,,,then check that the drive belt/s are tight and not flopy and slipping also it would be a good time to check the cutting blades they need to be sharp and not blunt or they strain the belts and start them slipping too also the engine wont like the extra load put on it
Another possibility, is a broken spring or a tight/ rusted idler pivot arm.
with the engine off & the deck down, engage the pto & pull on the belt to see which pulley is the tensioner
check the clutch if it engage then check the cable and belt to if it works make sure all the bolts are tight. usually the belts is too loose or if its a clutch drive maybe the clutch doesn't engage or worn out.
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