Backhoe ford 4500 TLB Brake housing torque

   / ford 4500 TLB Brake housing torque #1  

mercman65

New member
Joined
Aug 1, 2020
Messages
3
Tractor
1970 ford 4500 TLB
can someone please tell me the correct torque specs for my wet brakes inner brake housing 3/4 nuts. my book says to torque them to 72-90 lb. ft. I torqued them to 25 first to set them, then went to 82 but stopped before I got there. It seemed that I may strip it, so I backed down to 72 with the same results. I have a really bad habit of braking nuts and bolts and I really don't want to do it to this. I only wiped them off with a clean rag before I reinstalled them could that be the problem. Thank you for any help you can give.
 
   / ford 4500 TLB Brake housing torque #2  
I have two different manuals that has the same torque values. I doubt that they both are wrong.
According to the parts list, the nuts should be Grade 5, 1/2" - 20 UNF (wrench size 3/4"?) and the torque values seem correct for a dry assembly.

Could it be that the studs are turning as you tighten the nuts, and that feels like the nut threads yield?

https://avspare.com/catalog/newholland/49534/22057/235182/
 
   / ford 4500 TLB Brake housing torque
  • Thread Starter
#3  
I reread my post and may have figured out why. I only wiped them off with a clean dry rag which may have left some fluid on the threads. it looked dry but wasn't. so today I sprayed them with brake cleaner and used a brush to clean them. Then wiped them off with a clean paper towel. (I tried to make sure the brake cleaned did not go in the axle) I'm letting them sit until tomorrow to dry. Thank you for the info.
 
   / ford 4500 TLB Brake housing torque #4  
I see, make sure that the mating surfaces nut/housing are clean and dry as well.
 
   / ford 4500 TLB Brake housing torque
  • Thread Starter
#5  
Well I found out my torque wrench went bad. I used a different one and it worked fine to its max of 75. The one I was using that went bad went to 250+/- now I have to get a new one. oh well at least I didn't strip the threads. lol
 

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