JD X758 increasing mower deck noise

[joejess]

have a X758 with 30 hours on it, 10 or less hours mowing with 60" deck. Tractor is very quite when running w/o any attachments running, some noise when tilling but easily masked with ear muffs, mowing - greased well before first use and once since, initially could mow w/o muffs but used anyway, now it's annoying with muffs on. I made sure all debris was cleaned from deck before mowing this last time. Can't tell where noise is coming from while sitting on the seat, may look for a volunteer. Dealer mentioned possibly the gearbox but all appears good.

Any thoughts out there before I dig in deeper?

otherwise really like the tractor, added the 3 point, mid-pto etc.

thanks

 

[ruffdog]

Everything gets looser with age and mowers get noisier. We ALWAYS wear ear protection during mowing.

 

[Richard001]

Everything gets looser with age and mowers get noisier. We ALWAYS wear ear protection during mowing.

KInda like when I drove my old car, you never want to hear all those "funny" noises, so I always just turned the radio up loud.

 

[joejess]

Well thanks guys, looking like the best option

 

[ruffdog]

I have the x744, dad has the x749, and the neighbor has the x700, they all have the loud whistle/whine noise when mowing.

 

[IH3444]

Be sure that your deck gear box case is full of the proper gear oil. I changed mine to Amsoil severe gear 75w-90 at 128 hours, and then again at 130 hours. I removed the side level and fill plug, inserted a suction hose. Pulled out the factory oil, and the replaced it with the Amsoil. I did this twice to ensure a good fluid change. The box doesn't take much oil so it was not an expensive up grade. I already had a jug of the sever gear oil. I'm going to do it again soon at around 300 hours. My deck does not make the noise that I have read described here. I can actually hear through my ear plugs and ear muff noise protection the grass actually getting cut by the blades. I also have both my belt guards removed so that I can blow off the entire deck with my electric leaf blower. I do this several times when mowing. As well as pulling the engine screen, and blowing off the entire machine about every hour. I wanted the deck belt to run as cool as possible. I also have removed the side discharge chute so that the cut grass is discharged more evenly instead of being placed into also as I would describe as a row. This also increases the velocity of the dischared grass due to the restriction being remove. The underside of the deck remains amazingly clean without any slip plate. Big fan of synthetic oil. I have always found that equipment runs cooler. To each his own. The loud whistle/whine could be the 90 degree power transmission redirection to the deck belt through the gear box case. Gears will whine when spun up to high rpms. I just love my X750, 60HC mower. Just did the full service on it. What a mowing machine, and it just sips off road diesel. Man O man will that machine cut some grass fast, and turns on a dime. I'd rather cut grass with it that go to the Dominican Republic for vacation!

 

[chevy]

Have you checked the bottom of your deck for grass build up. Lots of grass build up under the deck will make more noise.

 

[joejess]

Thanks for the responses. Went through the deck again, all cleaned / greased / gearbox oil good. Last night was tilling garden, between removing the tiller and connecting to the mower deck I turned the PTO on and heard noise under the tractor. Thinking it was possibly the auto-connect I had the Mrs. occupy the seat and running the PTO switch while I checked underneath and it appears the noise is coming from the PTO gearbox assembly. Quite sure when I first got the mower I flipped the PTO on and could not hear it, last night it was noisy in all three positions rear PTO, Mid PTO and both. When I connected the deck, cranked up the rpm's and flipped the PTO that same noise from the PTO became louder as it transferred through the 60" deck. Has anyone had this issue? Are your PTO's noisy with nothing connected to your X7xx series tractors? PTO's on the 2520 and 3020 are quiet.

 

[joejess]

Forgot to mention that I'm closing in on only 40 hours on the machine.

thanks,

John

 

[Kish318420]

It sounds like you've isolated the problem, now is the tractor still under warranty? If it is, get it in and get the problem checked out before the warranty expires. If not under warranty it is time to get the TM for the tractor and the transmission from JD