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Old 01-17-2017, 10:48 AM   #1
jcurtis934
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torque of nuts on brakes

Getting ready to take off brake backing plate assemblies and haven't seen a torque spec for the five nuts used to hold these onto the spindle. Given that they are 3/8", would I be correct to assume 30-50 ftlbs? I will set my torque wrench on 40ft/lbs and try to tighten one of the nuts on the existing old plates just to "sort of verify" my thinking. This, of course, asssumes they were torqued correctly to start with. Thanks for your thoughts. John
 
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Old 01-17-2017, 12:13 PM   #2
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Old 01-17-2017, 02:31 PM   #3
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On page 79 of the Dexter 600-8K Complete Service Manual, the nut torque for the 12" X 2" brakes is 25-50 ft lbs.
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Old 01-17-2017, 02:39 PM   #4
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Per Dexter Axle when installing the backing plate assy for 12" brakes with 3/8" - 24 hex nuts ... Torque 25-50 ft lbs. I always put a bit of blue Loctite on them as well.
Sorry ... I was typing ... you were posting. I also put a small dab of never-seize on the 3 raised seats that each brake shoe rides on as well as the auto adjuster threads (if present). I also solder the brake wire connections and put shrink tape on the joints.
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Old 01-18-2017, 01:26 PM   #5
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I've always wondered why there is such a range for torque especially at low values, for example, two posts state 30 to 50 and another states 25 to 50. That's almost double the minimum value. I would settle for midway or about 35 to 40.
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Old 01-18-2017, 02:33 PM   #6
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When I replaced mine I set them to ~45. I do not remember the range b ut I went for on the high side of the range.
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Old 01-19-2017, 12:57 PM   #7
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Many thanks for the replies. I was thinking of adding some locktight as well, makes me feel better. John
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Old 01-19-2017, 01:58 PM   #8
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Over the years we have had our rig, I've had to replace the backing plate brake assemblies twice, and in that time, I have never experienced the nuts coming loose. I suppose locktite would be OK, but have never had a need to use it. Once the brakes have been applied, any movement in the backing plate has occurred, and then no more movement to cause any loosening in the nuts.
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