John E Davies Posted August 25, 2019 Share Posted August 25, 2019 EDIT 08/29/19 Added extra bolts to the coupler here: ...https://olivertraveltrailers.com/topic/how-to-reinforce-your-bulldog-coupler-by-adding-extra-bolts/ Please comment ... I am worried. Here is what I submitted to Service: Hi, I recently replaced my coupler with a larger one. I used new 1/2"-18 Grade 8 bolts and torqued them to the specified 80 ft lbs. That is the recommended value here: tsb-torque-specifications/ And it is also the recommended value, generically, for this bolt type and size. HOWEVER, the Bulldog instructions recommend installing Grade 5 bolts at 55 ft lbs. Bulldog Instr Today I went to check the bolt torques, and one of my Grade 8 ones sheared and flew across the room. The other bolt is fine. So either I just got one bad bolt, or the torque value is not appropriate for this application, or I should be using SOFTER, less brittle Grade 5 bolts as recommended by Bulldog, at a smaller torque value. I think you need to amend your TSB with detailed instructions on type of bolt to be used and the torque value. Somebody has, or is going to, replace his hardware using the Bulldog instructions and your higher TSB torque value, you can bet one it.,.... I also think this merits a new TSB and an email to all owners to clarify the situation. Please advise, should I just put in two new Gr 8 bolts at 80 ft lbs or go with Gr 5 at 55 ft lbs? Also, I want to install a third bolt half way between the two factory locations, to add some strength and a safety factor in case one fails. Is it OK to drill new holes up high, so the bolt runs just under the top inside surface of the tongue? I would not use a compression sleeve. John Davies Spokane WA 1 "Mouse": 2017 Legacy Elite II NARV (Not An RV) Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/ Tow Vehicle: 2013 Land Cruiser 200, 33" LT tires, airbags, Safari snorkel. Link to comment Share on other sites More sharing options...
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