JD 5020 Posted November 4, 2006 Share Posted November 4, 2006 Hey guys, need some help. I was looking at a B61 and both trunions were cracked. The front and back of the trunios were cracked ¾ the width. The truck is a tandem road tractor, winch, fifth wheel and fairly short wheel base; what would have broke both of these? Was the truck just worked hard or abused? It doesn’t look too painful to fix these, is it best to replace these or risk it and try to weld them? Anyone have a pair they would be willing to part with, rough price? One other thing, in a 711 if the oil is barely showing on the dip stick how low it is, one two gallons? Thanks, Jake Quote Link to comment https://www.bigmacktrucks.com/topic/1662-broken-trunions/ Share on other sites More sharing options...
maxidyne237 Posted November 5, 2006 Share Posted November 5, 2006 the trunion your speaking of, do you meen both sides the left and the right? It is common for the fabricated trunions to crack down by the load tube they also rust on the inside towards the bottom and weaken as well. The cast ones are deffinatley tougher and less prone to cracking. Someone else here prob has something I left out. All Mack diesels are 1 gal low at the add mark. Quote Link to comment https://www.bigmacktrucks.com/topic/1662-broken-trunions/#findComment-8193 Share on other sites More sharing options...
JD 5020 Posted November 5, 2006 Author Share Posted November 5, 2006 the trunion your speaking of, do you meen both sides the left and the right? It is common for the fabricated trunions to crack down by the load tube they also rust on the inside towards the bottom and weaken as well. The cast ones are deffinatley tougher and less prone to cracking. Someone else here prob has something I left out. All Mack diesels are 1 gal low at the add mark.Well sorta, both sides left and right are broke down by the load tube. If I remember right there looked to be two or three "webs". The front and back webs were cracked 3/4 the way across. Bear with me, im learning as I go and my vocabulary is limited. Quote Link to comment https://www.bigmacktrucks.com/topic/1662-broken-trunions/#findComment-8195 Share on other sites More sharing options...
CML Service Posted November 5, 2006 Share Posted November 5, 2006 The cast trunnion A frames do often crack near the tube. They do take a weld very well if you clean them up stop drill the crack and vee it for the weld. Best way is to remove them to do this. Chuck Quote Link to comment https://www.bigmacktrucks.com/topic/1662-broken-trunions/#findComment-8197 Share on other sites More sharing options...
MackLTH Posted November 5, 2006 Share Posted November 5, 2006 Jake,You might give Norm Taunton a call for a trunion. He is in California...209-745-2716Cheers, Pat Quote Link to comment https://www.bigmacktrucks.com/topic/1662-broken-trunions/#findComment-8207 Share on other sites More sharing options...
chris88 Posted November 21, 2006 Share Posted November 21, 2006 I was wondering about this myself. Im looking at a truck with pretty much the same specs without a winch and on one side the trunnion is cracked and has been welded before. Its good to hear that its safe to weld. Quote Link to comment https://www.bigmacktrucks.com/topic/1662-broken-trunions/#findComment-8524 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.