X748 cracked frame - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
John Deere Forum John Deere Garden Tractor talk

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 32 Old 11-27-2018, 05:28 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2018
Posts: 8
X748 cracked frame

Hi folks,

Just discovered that my X748 has a piece missing from the frame where the transmission bolts onto it. The opposite side also has a a hairline crack that appears to be following a similar route to that of the missing piece. Has anyone seen this before and do you think it is possible to repair, or should I replace?

John
Attached Thumbnails
Click image for larger version

Name:	Photo1.jpg
Views:	160
Size:	14.7 KB
ID:	2349049   Click image for larger version

Name:	Photo2.jpg
Views:	148
Size:	22.1 KB
ID:	2349051   Click image for larger version

Name:	Photo4.jpg
Views:	161
Size:	21.8 KB
ID:	2349053  
zeggaboy is offline  
Sponsored Links
Advertisement
 
post #2 of 32 Old 11-27-2018, 06:26 AM
Proud Member of the 1K Club
 
Join Date: Aug 2009
Location: Hardwood Lands, Nova Scotia
Posts: 1,054
Re: X748 cracked frame

I can't quite visualize the area, any chance of a long shot? Being a weldor by trade, I wouldn't hesitate to repair it and attempt to make it better.........Mike

Iseki TM 3160
Mike Milburn is offline  
post #3 of 32 Old 11-27-2018, 06:27 AM
Senior MTF Member
 
Mcgee10's Avatar
 
Join Date: Mar 2009
Location: Rockford, Michigan
Posts: 698
Barn
Re: X748 cracked frame

IMO that would need to be fixed. Is it under warranty? That should be fixed by John Deere looks like something was defective with that. I would remove that bolt and weld a piece of angle iron down that seem and drill the hole and replace that bolt. But that me.

Some other guys here will have more expertise on this more than I do. Maybe I'm not seeing this right. It would drive me nuts until I got that fixed

_____________________________



2018-JD X738
This tractor is like a billy goat on steroids
Pull behind- 25 gal. 12volt Fimco sprayer, spreader, JD-80 cart
Mcgee10 is offline  
Sponsored Links
Advertisement
 
post #4 of 32 Old 11-27-2018, 06:56 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2018
Posts: 8
Re: X748 cracked frame

Cheers Mike, I'll take another photo tomorrow and upload, should give you a better perspective.
zeggaboy is offline  
post #5 of 32 Old 11-27-2018, 07:02 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2018
Posts: 8
Re: X748 cracked frame

Hi Mcgee10, I purchased this tractor second hand a year ago, but only noticed the cracked frame yesterday after stripping her down. I doubt I will be able to make a warranty claim as the tractor is more than 10 years old, and I am not the original owner. Will be great to get other members advice as to whether this is has been seen previously and if people have attempted to fix something like this.
zeggaboy is offline  
post #6 of 32 Old 11-27-2018, 07:17 AM
Senior MTF Member
 
Join Date: Aug 2018
Location: Tennessee
Posts: 364
Re: X748 cracked frame

Zegga, That's definitely repairable, and HIGHLY recommended! A piece of angle iron welded in with a few holes drilled and you're in! As far as the crack in the frame, drill a hole, maybe 3/16" at each end of the crack. This will prevent the crack from "migrating" farther. After drilling, it could be welded from the outside of the frame, but really not necessary. Bob
rwmeyer is online now  
post #7 of 32 Old 11-27-2018, 08:13 AM
Proud Member of the 1K Club
 
Wfburton159's Avatar
 
Join Date: Jan 2010
Location: ND
Posts: 1,580
Re: X748 cracked frame

I bought a 445 that the bolt heads were snapped off. Frame was fine. Must be a high stress area. I now frequently keep an eye on my X485 after seeing the broken bolts on my 445. But yes have someone weld in a piece of angle iron and it will be better than new.


2003 John Deere X485
45 FEL w/ custom quick tach sliding forks
647 tiller
54c deck w/ mulch kit and power flow bagger
OTC weather enclosure w/ heat, glass, wiper, lights
Quick tach model 50 snowthrower w/ long chute
Custom 52" quick tach front blade
Modified foam filled turfs off a 400 (183# each)
75# wheel weights and chains
John Deere 40" Front Mount Thatcher w/hydraulic lift
John Deere 14SB
Wfburton159 is offline  
post #8 of 32 Old 11-27-2018, 08:23 AM
5000 Strong & Climbing
 
Join Date: Nov 2010
Location: Buford, Ga
Posts: 6,259
Re: X748 cracked frame

You can't just lay a piece of angle iron in there. The sharp corner of the angle iron would need to be ground to match or clear the radius of the frame rail. It would be better to use a section of formed steel that has the same radius and would nest in there perfectly. I would look for a junk JD LT1XX or LX2XX and cut a section of the frame out to use as a doubler.

There is a lot more going on than many think. Obviously there has been flexing in that area and probably some built in stress risers where the cracks originated. Adding more steel probably just moves the main stress to another area and cracks could start in that area. Still, This has to be fixed and I think my idea of a section of formed C-channel from another frame would be the best bet. You could even bolt it in place after welding the existing cracks.

I've used several cast off JD frames and sections in some of my projects which has always worked out great.
rayjay is offline  
post #9 of 32 Old 11-27-2018, 08:25 AM
5000 Strong & Climbing
 
Join Date: Nov 2010
Location: Buford, Ga
Posts: 6,259
Re: X748 cracked frame

This is a section from the rear of an LT1XX frame. I think it's 3" in height.

rayjay is offline  
post #10 of 32 Old 11-27-2018, 08:27 AM
5000 Strong & Climbing
 
Join Date: Nov 2010
Location: Buford, Ga
Posts: 6,259
Re: X748 cracked frame

This is an LT1XX with the fenderdeck cut off. You can see that there is some good raw materials there.

rayjay is offline  
post #11 of 32 Old 11-27-2018, 01:58 PM
Proud Member of the 1K Club
 
Join Date: Aug 2009
Location: Hardwood Lands, Nova Scotia
Posts: 1,054
Re: X748 cracked frame

As was said, a formed piece of material would be better, 3/16" possibly with maybe a couple of small gussetts inside the formed angle?.
There looks to be a few existing holes that could be used for bolting to the frame. If you do get it welded, remember welding is not the catch all, depending on how and where it's welded so don't go overboard. More is not necessarily better..............Mike

Iseki TM 3160
Mike Milburn is offline  
post #12 of 32 Old 11-27-2018, 07:09 PM
5000 Strong & Climbing
 
burned300's Avatar
 
Join Date: Dec 2012
Location: Columbus, Ohio
Posts: 5,967
Barn
Re: X748 cracked frame

I was told years ago that those breaks were the result of driving diagonally thru a ditch causing a bunch of frame twist.

2012 X720SE, Cat 1 three point, Click n Go, Snow Blade, 62C mower deck, Roller Striping kit, anti blow out kit and leaf kit
2004 X595 Cat 1 three point, Click n Go, Snow Blade w/Extensions
1970 112
1975 200
Gannon Earthgavator graderbox
#40 EZ Rake Vac
#40 EZ Rake Vac
#70 EZ Rake Vac
1977 MTD 990 Parts Tractor
198? MTD 990 W/Haban sicklebar
Ohio Steel yard cart
Brinly cat 0 plow
John Deere cat 1 plow
Innovative brand, Grapple
Deere I've owned, 110 140 160 210 212 214 216 300 316Onan 420 X485
burned300 is online now  
post #13 of 32 Old 11-27-2018, 07:30 PM
5000 Strong & Climbing
 
Join Date: Nov 2010
Location: Buford, Ga
Posts: 6,259
Re: X748 cracked frame

Quote:
Originally Posted by burned300 View Post
I was told years ago that those breaks were the result of driving diagonally thru a ditch causing a bunch of frame twist.
The 325/335/345 and GX series have a rubber mounting arrangement for the transmission. I'm surprised that the bigger units don't. The frame and transaxle mounting either have to be massively strong or designed with some give .
rayjay is offline  
post #14 of 32 Old 11-28-2018, 02:54 PM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2018
Posts: 8
Re: X748 cracked frame

Many thanks for all the information folks, this is very informative and helpful!
zeggaboy is offline  
post #15 of 32 Old 11-29-2018, 10:46 PM
AKA Moses Lawnagan
 
KHodges's Avatar
 
Join Date: Mar 2009
Location: Newton, NC
Posts: 4,549
Re: X748 cracked frame

Quote:
Originally Posted by Mike Milburn View Post
I can't quite visualize the area, any chance of a long shot? Being a weldor by trade, I wouldn't hesitate to repair it and attempt to make it better.........Mike
It's where the transmission's axle housings bolt to the frame.

Quote:
Originally Posted by burned300 View Post
I was told years ago that those breaks were the result of driving diagonally thru a ditch causing a bunch of frame twist.
I can see how that could happen after many years of use. I was surprised at how my frame flexes in situations like that the first few times I saw it happen; I would have expected a much stiffer design for this heavy a machine. My frame will flex enough that the hood pops up around the rear edge where it fits around the radiator housing, when I cross a ditch at an angle. Guess I need to inspect my frame to see if I have any issues, after 1400 hours of use.

Proud owner of :
'08 JD X748SE, 54C deck
3-pt hitch, rear PTO
Power Flow and MC519 cart
LP RTR0550 rototiller
?? 60" box blade
Simplicity 10" plow adapted to 3-pt hitch
45 Loader
3-point PTO DR wood chipper

'02 JD GT235, 48C deck

'84 JD 318, 50" deck

'86 JD 214, 46" deck

'86 JD 212, 38" deck
KHodges is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome