Briggs 6:1 gearbox broke - need advice - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
Small Engines and Repair

Midwest Mower Pro

 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 11-07-2019, 01:29 PM Thread Starter
MTF Member
 
vtx531's Avatar
 
Join Date: Feb 2010
Location: MI
Posts: 94
Briggs 6:1 gearbox broke - need advice

Obviously the big outer gear is damaged. I have two questions-

1. Do you think the crankshaft needs to be replaced too? I canít tell if that gear is worn/damaged also. Maybe it is hardened and came out okay?

2. What would cause this? Is there something else I need to give attention to so this doesnít happen to the replacement gear?
Attached Thumbnails
Click image for larger version

Name:	FD7DF0E5-B96E-4CF3-A55F-1FAE615A4BFB.jpeg
Views:	9
Size:	2.68 MB
ID:	2405129   Click image for larger version

Name:	0E7FA5F8-6A17-4E6C-B7F1-C373634366F1.jpeg
Views:	7
Size:	2.14 MB
ID:	2405131  
vtx531 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 11-07-2019, 03:51 PM Thread Starter
MTF Member
 
vtx531's Avatar
 
Join Date: Feb 2010
Location: MI
Posts: 94
Re: Briggs 6:1 gearbox broke - need advice

Closeup

Im thinking if the face of the teeth on the little gear are okay then I might be fine replacing just the big gear and hope for the best?
Attached Thumbnails
Click image for larger version

Name:	39013249-12BB-4755-9549-B163532F13EA.jpg
Views:	7
Size:	244.0 KB
ID:	2405143   Click image for larger version

Name:	A88284E5-B2F4-4A7F-A7D1-4A8E038C4D06.jpg
Views:	6
Size:	170.5 KB
ID:	2405145  

Last edited by vtx531; 11-07-2019 at 03:56 PM.
vtx531 is offline  
post #3 of 5 Old Today, 11:32 AM
3K Poster!!!!
 
Join Date: Nov 2009
Location: georgia's toe-nails of the foot hills
Posts: 4,733
Re: Briggs 6:1 gearbox broke - need advice

Was there any lube in the gearcase? It appears that something got between the ring gear and the small gear. That would cause tooth breakage as there is very little clearance between the teeth of each. It could be that one tooth failed, and that lead to the others being damaged during the time it took to come to a stop. One other cause of breakage is overloading the teeth past their capacity.
If you can find another gear in reasonable shape, I would not have any qualms about replacing just the outer gear after cleaning things thoroughly. I have no clue as to the lubricant required.
tom

simplificate & add lightness

It's not how hard you work, it's how much you get done.
tomw0 is online now  
Sponsored Links
Advertisement
 
post #4 of 5 Old Today, 11:51 AM
Proud Member of the 1K Club
 
MARK (LI)'s Avatar
 
Join Date: Apr 2017
Location: LONG ISLAND, NY
Posts: 1,859
Re: Briggs 6:1 gearbox broke - need advice

Whether one thinks the shaft is damaged or not is a tough call....although tedious, if you are going to fix this, you really have to be sure before investing the time and moolah into the repair....you have come this far...it would be a big setback if you find the part and take the time to do it and re assemble it and then come across further problems...the smaller gear LOOKS unaffected...but I would examine it very closely with a magnifying glass and be extremely critical...feel as much of it as you can with your fingers to see if you determine any unnatural sharp or rough edges...I would be afraid that once the teeth on the larger gear broke off that the debris could have gotten caught between the gears and done some damage to the smaller one...for you to have gotten this far with it....it looks like you know what you are doing...and I have only seen similar problem a few times...please keep us abreast of your progress and more pictures it would be an interesting experience for all of us to learn something
MARK (LI) is online now  
post #5 of 5 Old Today, 12:03 PM
15,000 +posts!
 
Tractor-Holic's Avatar
 
Join Date: Jan 2008
Location: MA
Posts: 19,561
Re: Briggs 6:1 gearbox broke - need advice

I've never seen one of those 6:1 gearboxes break !..

I'd agree inspecting the small gear very closely is a must..not sure if those are a "matched set" of gears or not--the old crank gear might not mesh well with another used ring gear even if it is undamaged...but it'll probably work for awhile at the least..

I believe the gear boxes used SAE 30 oil just like the engine ..I'd prefer gear oil,but maybe they were concerned that might end up in the crankcase if the seals failed ..


Tractor-Holic is online now  
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: 2 (1 members and 1 guests)
tomw0
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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