Cab to Frame Mounting Bolts

[bkahler]

I've checked the manual and couldn't find anything about bolt torque.  Does anyone know if there is a spec for just how tight the four cab to frame mounting bolts are supposed to be?

[Merle Coggins]

Tight enough so that the cab won't fall off? 

I know that's a Smart @$$ answer, but generally when you don't have a specified torque published, just go with standard torque for that size fastener, such as this one. 

 

 

Torque-Tension Reference Guide.pdf

Edited December 3 by Merle Coggins

[ggdad1951]

gut'n'tite!

[bkahler]

32 minutes ago, Merle Coggins said:

Tight enough so that the cab won't fall off? 

😄

 

32 minutes ago, Merle Coggins said:

I know that's a Smart @$$ answer, but generally when you don't have a specified torque published, just go with standard torque for that size fastener, such as this one. 

 

I know what mean.  When I initially installed them I tightened the bolts to where the rubber was just starting to compress.  That got me to thinking, shouldn't there be a torque value somewhere to say when to stop tightening.  It's probably a moot point since the original rubber density is probably not what the repro rubber spacers are made of.

 

32 minutes ago, Merle Coggins said:

 

Torque-Tension Reference Guide.pdf 135.33 kB · 0 downloads

 

[bkahler]

6 minutes ago, ggdad1951 said:

gut'n'tite!

 

That I can do...I have a nice cordless Milwaukee 1/2" high torque impact that I'm sure can reach the gut'n'tite spec

 

[Merle Coggins]

As I recall there's a metal sleeve inside the rubber mounts so that you can tighten the bolt and only squish the rubber so much. 

[bkahler]

1 minute ago, Merle Coggins said:

As I recall there's a metal sleeve inside the rubber mounts so that you can tighten the bolt and only squish the rubber so much. 

 

Good point.  I had assumed the tube was to keep the rubber from compressing against the bolt, which seems kind of silly thinking about it now. 

[JBNeal]

2 hours ago, bkahler said:

I've checked the manual and couldn't find anything about bolt torque.  Does anyone know if there is a spec for just how tight the four cab to frame mounting bolts are supposed to be?

Compare this excerpt from the C-1 shop manual to the B-3 shop manual...kinda looks like finger tight + 1/8 to 1/4 turn I reckon

[bkahler]

13 minutes ago, JBNeal said:

Compare this excerpt from the C-1 shop manual to the B-3 shop manual...kinda looks like finger tight + 1/8 to 1/4 turn I reckon

 

I thought I had seen 20 ft/lbs mentioned somewhere before.  In my hand written notes I had written 20 ft/lbs but didn't state where I saw it.  I don't have a C series manual so I must have run across the number somewhere in my searches on this forum.  Thanks JB!

[Sniper]

At 20 foot pounds I'd probably use blue Loctite just to make sure the nut didn't loosen

[JBNeal]

Before the advent of zinc plated hardware, I reckon that the engineers relied upon nature's thread lock:  iron oxide.  For this low torque application, I'd be leaning towards flattening some threads with pliers or a hammer + punch, cuz how often is cab mounting hardware going to need removing...then again, I've recently seen pics on the internets of oil drain plugs tacked to the pan, sometimes jokesters leave surprises for the next guy 👀

[Eneto-55]

Back when I worked in a plating shop (late 70's through early 80's) cadmium was the go-to for rust protection. (We also Cad plated stainless roofing screws, not to protect it from rust, but as a lubricant.)

[David A.]

I used Nylock nuts on mine.