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Discussion Starter #1 (Edited)
My '99 345 54" deck is running on it's last leg, and it needs replacing. The only problem is the fact a new 345 54" mower deck runs about $2,400.00 with no pulleys, no deck wheels, no other parts other than labels from a dealer. Besides it will take more than a month to get one from the dealer.
I found a JD X360 54" deck on ebay, and from all appearances it appears that it will fit right under the 345 draft arms assembly and lift assembly. So, here is the big question. Has anyone on this forum tried and used a X360 54" deck on a JD345?

 

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Yes, it has been done. Check this thread out:

 

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Discussion Starter #3 (Edited)
Yes, it has been done. Check this thread out:

demonspeed, thanks for the reply. I have a '99 345. There is a "slight" difference between the older model JD 345 and the GX345 series. The spec. data on the 345 is....wheelbase: 47.9 inches, length: 72.25 inches, width: 39 inches, height: 43.6 inches, weight: 699 lbs. On the GX345 data.... wheelbase: 49.25 inches, length: 72.25 inches, width: 39 inches, height: 43.6 inches, weight: 683 lbs. So, it appears there is approx. 1-3/8" inches longer (wheelbase) over the older 345. There is no change between the two on other dimension's.

I have bought the 54" mower deck in my original thread....above pictures) . I think I can adjust the draft linkage (up front) to made up for the 1-3/8" more distance on the mower belt. It appears that it will fit under the older 345 without any measurement problems.
This 54" deck came from a JDX360, which has some simelier data specs.
Wheelbase: 49.4 inches.
Length: 72 inches.
Width: 38.5 inches.
Weight: 570 lbs.
Height: 43 inches.
Rear Tires: 22 x 11.00-10"
 

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Good luck! Post back with how it ends up. I was considering doing the same as there were several X300 decks that popped up on Marketplace this last summer with virtually no use for a couple hundred bucks. Never pulled the trigger, though, as I didn’t need another project.
 
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