Mowing Blades running backwards

[4570Man]

I stand by my suggestion.

If it was a rear discharge it could potentially work but a side discharge is going to cut horrible if it’s spinning the wrong direction. The only solution that will make the deck cut like it’s supposed to is make it turn the correct way and put the correct blades on.

 

[JWR]

I stand by my suggestion.

And of course I stand by my comment.

 

[CH4Ohio]

I bought a b7500 with a 60" belly mower last week. It's not cutting grass very well so I look under the deck and I see that the bladed are on upside-down. I ordered a new set on blades from kubota and I put the first one on and I realize it isn't going to cut because the forward edge, as the deck currently rotating, is backwards. I realize now that the blades are on upside-down because the blades are rotating backwards. What can cause this? The previous owner replaced the gearbox on the deck. Is it possible that the gearbox is the wrong one and is the problem? Thanks

This further confirms my belief that no one gets rid of a mower that's operating properly and doing a good job. Short of Divorce or Death, I'm suspicious of any used mower for sale.

 

[TMGT]

First the deck for the B7500 should be 54" not 60". Then the belt will not change the direction of the blades, only the gear box. https://www.messicks.com/catalogs/kubota/rck54-24b/mower/a01300-tension-pulley

I suspect its the wrong gear box (maybe for a rear discharge deck?)

They offered both 54 and 60in decks for the B7500.

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[TMGT]

"Previous owner changed the gearbox":
The fix:
Upside Down Gearbox: If you have recently removed, repaired, or replaced the mower deck's right-angle gearbox, it may have been reattached upside down. Flipping the gearbox 180 degrees will reverse the direction of the output shaft.

The way the Kubota gearbox is made makes this pretty much impossible, they only go on one way.

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[Fuddyduddy1952]

The way the Kubota gearbox is made makes this pretty much impossible, they only go on one way.

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I would at least check it, or open it up if possible. From the little bit of research I just did, CW & CCW mower blades are available.

 

[TMGT]

I would at least check it, or open it up if possible. From the little bit of research I just did, CW & CCW mower blades are available.

There are, I have several LH discharge decks from other manufacturers, but the RCK60-24b that should be on his tractor uses a RH discharge deck, which turns the blades CW when looking at the pulley side.

If the spindles are indeed turning CCW, changing out the blade to make it work would be a huge disappointment. The way the baffling is set it won't cut worth a darn. If you can even find a CCW blade that'll fit that deck.



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[Fuddyduddy1952]

I'm throwing ideas out there, but I would bet money when new the deck cut just fine.
That was until: "The previous owner replaced the gearbox on the deck."
The solution then is:
1) see if replacement gearbox can be made to run the other direction.
2) replace the gearbox with correct one
3) sell the mower deck

 

[JWR]

I'm throwing ideas out there, but I would bet money when new the deck cut just fine.
That was until: "The previous owner replaced the gearbox on the deck."
The solution then is:
1) see if replacement gearbox can be made to run the other direction.
2) replace the gearbox with correct one
3) sell the mower deck

But first just see if the belt is installed correctly. It MIGHT be wrapped on the drive pulley the wrong direction...

 

[Fuddyduddy1952]

I assume (???) mower is mid-PTO driven...not belt.

 

[JWR]

I assume (???) mower is mid-PTO driven...not belt.

All these-sized Kubotas with belly mowers (that I ever saw, and that you can find on-line) have the deck driven by a mid-PTO. The only belt is on the deck driving the blade spindles. That belt runs off the drive pully on the gear box. The gear box being driven by the shaft from the PTO of course. When I questioned the belt installation above it was because of the possibility that belt on the deck might have been incorrectly installed and was running around the drive pulley the wrong way. That would of course cause all the blades to run in reverse.
Not possible after further investigation. See post #33 below.

 

[Fuddyduddy1952]

I assume (???) it's a V-belt with V-belt pulleys.
I don't believe it would be possible to install it incorrectly.
So wrong gearbox for the deck.

 

[JWR]

I assume (???) it's a V-belt with V-belt pulleys.
I don't believe it would be possible to install it incorrectly.
So wrong gearbox for the deck.

Those belts are multi-V wide. Ones I see are "2-V-wide" and on the flat side around 2" wide. The flat back side of the belt runs around things like a tension idler. I just went out and looked more closely at mine and I think you are right -- I do not see how a person could install it incorrectly such that the blades run backwards. Many decks have a serpentine pattern path for the belt that is hard to follow and sometimes hard to get on correctly (especially if a belt broke and you do not see where it was before removal. There is usually a diagram on the body of the mower.) The drive pulley is grooved for the "2-V-wide" and the flat side of the belt would never get wrapped around the drive pulley.

Even though I brought it up as a possibility, after more study I do not see how the belt could have been put on wrong to cause reverse rotation.

 

[Carl_NH]

Even though I brought it up as a possibility, after more study I do not see how the belt could have been put on wrong to cause reverse rotation.

Yep - as indicated in Post # 8. "the belt will not change the direction of the blades, only the gear box"

 

[DCNMVA]

John deere gearboxes can be assembled in two ways: drive gear forward or at the back. This provides for 2 possible rotation directions.

I found a tag on the aftermarket gearbox. It is the wrong part number. Before I shell out $1400 for another gearbox I want to know more about taking it apart and reversing it. zzvyb6, is this something you have done? Sure would save me a lot of money. I looked at the diagram of the gear box and I cannot see where the shaft would accommodate moving the gear.

 

[JWR]

I found a tag on the aftermarket gearbox. It is the wrong part number. Before I shell out $1400 for another gearbox I want to know more about taking it apart and reversing it. zzvyb6, is this something you have done? Sure would save me a lot of money.

I think there is a far better approach. Find out what mower deck that gearbox was claimed by the manufacturer to fit. Do your homework on that gearbox and then contact the manufacturer and discuss the problem. Taking it apart with a goal of reversing rotation makes no sense.

 

[DCNMVA]

The manufacturer will be happy to sell me a $1400 gearbox. But not really. These people have the worst customer service of any company I've ever dealt with. They do business via text messaging, except they don't bother to respond. I wish someone else made aftermarket gearboxes.

 

[DCNMVA]

I found this. Looks like I can change rotation. I will need a different input shaft. Previous owner is going to send me the old gearbox. Fingers crossed.

 

[JWR]

I found this. Looks like I can change rotation. I will need a different input shaft. Previous owner is going to send me the old gearbox. Fingers crossed.

Intriguing for sure. Keep us updated on this adventure...

 

[zzvyb6]

I think there is a far better approach. Find out what mower deck that gearbox was claimed by the manufacturer to fit. Do your homework on that gearbox and then contact the manufacturer and discuss the problem. Taking it apart with a goal of reversing rotation makes no sense.

What is the basis for saying that ? Gearboxes I buy and the one for my F935 is in 3 case parts. Same with my Land Pride FD2584 rear mower. The main container and 2 end plates. The bevel gear and the pinion can be installed two different ways. I swapped them to run my front snow blower. I didn't have to buy a different gearbox, I didn't have to cut into the deck for a left side discharge like I know some propeller heads would do, and I don't need special blades. Putting the 2584 on my 1435 to make a large rear discharge front mower was to much for the 26 h.p. motor.

How did you figure it would be better to buy another $1400 part ? I would have sent it back for a refund or exchange if it was the wrong item.