Batwing Gear Box blew up

   / Batwing Gear Box blew up #1  

EddieWalker

Epic Contributor
Joined
May 26, 2003
Messages
27,626
Location
Tyler, Texas
Tractor
Several, all used and abused.
While minding my own business, just driving along, mowing the grass, I heard what sounded like a branch being destroyed by the mower blades. But it kept going of for longer then it should, so I looked back and saw a round cap laying behind the gear box, and oil everywhere.

IMG_3904.JPG

I headed back in and took of the top cover. The gears all look good, but the gear that goes through the middle of the case, and connects to the driveshaft, slides back and forth. If I slide it to the tractor, it turns the blades. If I slide it away from the tractor, the blades do not turn.

IMG_3905.JPG IMG_3906.JPG

It was Saturday afternoon, but I sent an email to my dealer, PR Equipment in Karens TX a note asking about my Five Year Warrantee. I checked my email a few hours later and had a saw that they had replied. Basically, if I didn't run it with no oil in it, the Warrantee is good. Then on Monday morning, they called me and asked me the same question, did I have oil in the gearbox? I did, and after I told him what happened, he said that I had the perfect scenario for a Warrantee Claim.

I had two options. Take the entire batwing to them, and they will do all the work, or bring just the gear box to them, and they will give me a new one.

Unhooking the batwing, loading it onto a trailer, and hauling there, and then going back to pick it up, haul it home, and hook it back up again, sounded like a lot more work then taking it off and just bringing them the gear box.

I've never removed a stump jumper before in one piece, so I can use it again. The one time I did it before, I used a grinder and a cutting torch since it had cracked, and it was already junk.

This is the main reason for this post. Getting the stump jumper off was almost overwhelming. I couldn't pry it from anywhere, and I didn't have anything to pull it off. I looked at some YouTube videos, and Land Pride had one showing them use a T Post pounder to get it off. That seemed like the easiest, least complicated way to get it off. In the video, he hit it two times, where the bolts for the blades attach, and then one time at the other bolt location. In my world, I hit it four times, did the other side four times, then went back and fourth, hitting it four times on each side, until it fell off. I didn't count how many times I rotated it, but it was enough to get a workout. Maybe 7 or 8 times total before it fell off.

452448482_10233090227620530_988062570149342647_n.jpg

Once it was done, I was so happy, that I needed to post this in case others have to take off their stump jumper!!!!

Now I'm waiting for the new gear box to get here

452646423_10233090417385274_5523375660996517122_n.jpg
 
   / Batwing Gear Box blew up #3  
So......after all those fun and games. Any ideas on what caused the problem.
 
   / Batwing Gear Box blew up #4  
The t post driver is a good idea. I may try that on the rotary cutter blade bolts.
 
   / Batwing Gear Box blew up
  • Thread Starter
#5  
I don't have any idea what happened to it. I wasn't even in anything all that thick.
 
   / Batwing Gear Box blew up #6  
Did it push the snap ring that holds the bearing race out of the groove? Kinda looks like it and then it pushed the plug out.

Being that the bigger gear pushes on that bearing under load, the hit may have been hard enough to push the snap ring out the groove. To be honest, not a very good design solution for that.
 
   / Batwing Gear Box blew up
  • Thread Starter
#7  
I think that's what happened. I took out the snap ring and tried to push it back, but it wouldn't move, so I decided not to make it worse, and I put the snap ring back in where it's at now. The cap that fell out, wont go back in because the snap ring, and bearings, are in it's way
 
   / Batwing Gear Box blew up #8  
Sorry to hear of your trouble.

It looks like you did good with the post driver.

What brand cutter is that?

It doesn't seem to make much difference in what brand cutter it is anymore, because they all use cheap Chinese gear boxes now. Still, I think some are better than others. Most of my 12' batwing gearbox failures have just been cutting growth like you were in. Nothing heavy, nothing real brushy. Just normal cutting. Had gearbox failures on Woods BW12, and Modern Ag Viper... 3 gearbox failures total between the 2. All covered under warranty.

One side note, I've gone to 0wt corn head grease in my gear boxes now. Just another fail safe to perhaps get some more hours out of them.
 
   / Batwing Gear Box blew up #9  
I wonder if there’s even ONE manufacturer of bush hog gear boxes left in the USA or EU? Or did NAFTA and other horrific trade policies eliminate them all?
My Deere gearboxes are made in china and have been excellent. I’m afraid to switch to CHG because the oil has been just fine and never had a drip of oil.
It’s the best for if you get a catastrophic leak.

Eddie, what brand bush hog did you buy?
 
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   / Batwing Gear Box blew up #10  
Most Comer Industries gearboxes and PTO shafts are made in China and they supply most implement manufacturers all over the world, so there is that.
 
   / Batwing Gear Box blew up #11  
I'm interested in the drone video. Did you speed it up with editing software? Or did you do that with the drone itself? And, how long was the drone up taking the video?
 
   / Batwing Gear Box blew up #12  
I would really like to do the drone thing.
 
   / Batwing Gear Box blew up #13  
I've removed stump jumpers several times using home-made wood wedges. I initially measured the distance between the underside of the deck and outer lip of the SJ. 4 sets (2 each) of wedges (5" long) were cut from 3/4" scrap. A small notch was cut in the 4 wedges that contact the SJ.... so they don't 'walk' when its mate is struck.

I loosen the main castle nut (but leave it on), position a notched wedge on the rim of the SJ, and slide in its mate against the top deck. With all 4 wedge sets in position around the SJ, I start tapping the deck side wedges in with a 16 oz hammer. Within a minute or so the SJ releases with bang! I've kept the wedges in the shop in case there is a 'next time'. Works well!
 
   / Batwing Gear Box blew up
  • Thread Starter
#14  
The mower was Titan when I bought it, but a couple months later, they changed their name to Iron Craft after losing a court case against the other implement company in Tennessee that's also called Titan.

This is the top of the gear box.

IMG_3907.JPG
 
   / Batwing Gear Box blew up #15  
Unrelated to the failure, but it seems odd how the splines on the main drive shaft extend through the front of the gear box. I wonder how you can ever get a seal with that kind of arrangement? I can't see this part on my Frontier cutter, but I'll bet it is the same and probably explains why it leaks oil out the front with very low hours (100 hours, estimated).

This is how I would have expected it to look:
pto79b.jpg
 
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   / Batwing Gear Box blew up
  • Thread Starter
#16  
My drone has a micro SD Card that records everything. For this video, I flew it into position that gave me a good view of where I was going to mow, and then left it there. The battery is rated for about 30 minutes, so I just let it fly until the battery was dead, and it returned to the landing pad on it's own. This was my first time trying that. I take out the card and download it to my computer for editing.

The drone is a DJI Mini 4 Pro

I'm struggling with editing the video, and using ClipChamp and CapCut to get it done. I prefer ClipChamp, but it never stops buffering on the drone footage. I can get Cap Cut to edit it down to what I want, then upload it back to my "Video" file, and then load it back to ClipChamp to add captions and change the speed. Both Apps can do this, but with the free versions, I'm limited to what they offer. I'm debating on paying for the full versions, but I'm not sure if I like them, or if I need to keep looking. I also think that I need a new computer, since mine is something like 13 or 14 years old. The fastest speed that I went to in that video was 22X
 
   / Batwing Gear Box blew up #17  
I wonder if there’s even ONE manufacturer of bush hog gear boxes left in the USA or EU? Or did NAFTA and other horrific trade policies eliminate them all?
My Deere gearboxes are made in china and have been excellent. I’m afraid to switch to CHG because the oil has been just fine and never had a drip of oil.
It’s the best for if you get a catastrophic leak.

Eddie, what brand bush hog did you buy?

On 12 foot cutters, 3 of the brand names use the same chassis. Bush Hog 2212, Land Pride 2512, and Modern Ag 12' Viper and Predator.

I don't think BH still makes theirs, but it's a Bush Hog design platform... They have gone even lighter and cheaper built since then.

The older ones were much better. Big square gear boxes.

I'm using CHG because the vented caps in my gear boxes throw out oil onto the deck. According to the maker, it's because of the direction the gears are running inside. Not sure I buy that, but the CHG sure stopped it from blowing out.
 
   / Batwing Gear Box blew up #18  
The mower was Titan when I bought it, but a couple months later, they changed their name to Iron Craft after losing a court case against the other implement company in Tennessee that's also called Titan.

This is the top of the gear box.

View attachment 881658
Oh man - I just bought the 12' Ironcraft. This doesn't give me a good feeling.
 
   / Batwing Gear Box blew up #19  
Oh man - I just bought the 12' Ironcraft. This doesn't give me a good feeling.
At least you didn't buy a Woods BW12... Total junk. Sold mine for half of what I paid for it while it was still under warranty. :confused:
 
   / Batwing Gear Box blew up #20  
At least you didn't buy a Woods BW12... Total junk. Sold mine for half of what I paid for it while it was still under warranty. :confused:
I took a big hit on my Woods BW-180HD
Nice machine when I bought it, but single layer deck was ruined in a year and at best, it was painted with a mop over rust haze.
 

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