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| Reaction Arm Install [message #302969] |
Sat, 02 July 2016 18:47  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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I got the Applied drum brake reaction arm kit, and started in on the new used coach with it. The first day's pictures are here:
http://www.gmcmhphotos.com/photos/g6947-reaction-arm.html
If you look at the spindle, you'll see a dark line along the top just inboard of where the bearing sits; and you'll see a bunch of marks the crack emanates from. Somewhere along the line, this thing ate an outer bearing, and whomever repaired it simply put a new bearing in and gave the coach back to the owner. That crack goes all the way around the spindle - a decent lick and it will break off. I ran it 2400 miles like that. There are witness marks on the frame where the wheel got into it, the gouges are easy to spot. The mechanic even ruined the grease cap via ignorance, and 'repaired' it with RTV. I suspect this may have been due to the PPO, the PO used a very reputable GMC shop for repairs and maintenance. Anyhow, I've another spindle and a press plate for the install on the way.
Note the new design reaction arms. They're simpler, and I suspect sturdier than the bar and tube ones with fittings welded on the end. They allow a bit simpler bracket for the center ends as well. The trunnion boxes are also slightly different, they appear both stronger and simpler to manufacture. Now, where fasteners are in shear instead of in tension, self - locking nuts are supplied. All the bolts and all the nuts which are in tension are #8 grade hardened hardware. I will do three (I don't think there's another bad spindle) and then finish the cracked one when the parts arrive.
Keep watching this space.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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