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I need to put on a new belt on my John Deere 54" mower deck. I have no idea which way to loop it correctly thru all the pulleys. Does anyone have a good diagram or picture of this. The deck is on a John Deere 425 lawn tractor with a hydrostatic trans. Your help is greatly appreciated! Thanks! Jim
 

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I need to put on a new belt on my John Deere 54" mower deck. I have no idea which way to loop it correctly thru all the pulleys. Does anyone have a good diagram or picture of this. The deck is on a John Deere 425 lawn tractor with a hydrostatic trans. Your help is greatly appreciated! Thanks! Jim
There should be a picture in the operator's manual showing the routing. If you don't have one, let us know and someone will find a diagram in the online operator's manual.
 

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I have seen them on the deck as well....not sure about yours
 

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These are the deck decals for the implements for the 425, 445, 455.......I have the 455 with the 60" deck and it seems like there is a label on top of the deck under the guards which show the belt routing. Since your tractor should have a shaft drive deck, I would suggest matching up the label below to the pulley arrangement on your deck. Just because these decals at the top of the page say Commercial 60 and Commercial 72, the routing pulley decals shown are for all the decks used on these machines. Just match up the pulley layout to your deck.

Also, check to make sure there isn't a decal on your deck, under one of the pulley guards or elsewhere where you can see it with the deck on the tractor.

Seems to me that my 60" deck is routed like decal number 12, but that is just from memory. Once you match up your pulley layout to the decal, if you don't have the decal, you may want to order it. The part number is found in the link below.

Generally, because of the use of the idler pulley on these decks, replacing the belt is very easy. Release the idler pulley and the belt should come right off. Just watch your fingers and keep them from between the pulley grooves and the belt as there is a lot of tension on the idler pulley and other tension pulleys on the deck and once you release the pulley, the belt will tighten right up.

It's a good time to use a gas powered blower to clean all of the dirt and debris off the deck once you have the safety shrouds removed. Make sure to hit all of the grease zirks when you have the covers off, including the zirks on the idler pulley arms and on the spindles, etc.

I will post the link to the parts diagram right here as well.......In case you want to order the decal if you don't have it, the part number and other information can be found at this link. There are other decals available on other links in case your deck pulley layout isn't illustrated below. Hope this is helpful.

John Deere - Parts Catalog

 

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You haven鈥檛 listed the model number of your deck. I am going to assume here that it is a 54C deck since I don鈥檛 think the 425 had a drive over deck.

This is the owner鈥檚 manual for the 54C deck. If your deck is different please provide the model number.

OMM146676_K6
 

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As luck would have it I have a book from your deck. Here ya go. You'll need to pull the gearbox and I'd check and replace the 80-90 gl5 gear grease in the gearbox while you are at it and check the tensioner bushing and idler bearings.
 

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As luck would have it I have a book from your deck. Here ya go. You'll need to pull the gearbox and I'd check and replace the 80-90 gl5 gear grease in the gearbox while you are at it and check the tensioner bushing and idler bearings.
The gear box doesn't have to come off to replace the deck belt on a 54 mower on a 4X5 series. I've changed at least six on mine over the last 23 years.
 

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The gear box doesn't have to come off to replace the deck belt on a 54 mower on a 4X5 series. I've changed at least six on mine over the last 23 years.
I changed mine last summer and I remember having to but I also changed the grease in the gearbox and maybe that was why. My memory fails me at times. :lolol:
 

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My OM says to remove the idler pulley bracket, but I don't recall doing that either. I just reinstalled the belt a couple weeks ago because of a stick caught between the belt and one spindle pulley. The only tool I used was an adjustable wrench on the idler bracket to stretch the spring.

PS: My memory has just plain failed. It's like when a hard drive gets fragmented or whatever they call it.
 
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