tom1361 Posted October 7, 2017 Share Posted October 7, 2017 getting ready to put the back end of the b 67 back together. i have contacted the mack museum but didn't get all the info i needed. i'm in need of some torque specs for the following.........battery box to frame bolts, air starter mounting brackets to frame bolts, u joint cap bolts[ 1700 series], brake canister hanger to rear housing bolts, rear spring hanger to frame bolts, rear spring hanger pinch bolts, brake drum to spoke bolts, rear lug nuts, axle nuts and the last bolt is the rear brake shoe pin keeper bolt. lastly , what is the proper way to set the wheel bearing preload? some say torque to 200 ft. lbs. while spinning the wheel both ways then back off then re torque to 50 ft. lbs?? any information would be helpful. thanks, tomvb. Quote Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/ Share on other sites More sharing options...
j hancock Posted October 7, 2017 Share Posted October 7, 2017 For the fasteners, use a torque chart to figure out what you need. It will depend on size of bolt, thread and grade. Click link for a chart. https://www.boltdepot.com/fastener-information/bolts/US-Recommended-Torque.aspx Bearing should be adjusted until there is a slight drag or if a dial indicator is available between .003 and .008 end play. The lock nut would be tightened to 300-400 lbs ft. Having the bearings a tiny bit loose is better than too tight. 2 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381866 Share on other sites More sharing options...
tom1361 Posted October 8, 2017 Author Share Posted October 8, 2017 thank you for the help! Quote Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381918 Share on other sites More sharing options...
hatcity Posted October 8, 2017 Share Posted October 8, 2017 wheel bearings- while turning wheel, 200, back off one full turn then torque to 50, then back off one flat. Outer nut to 400 oil bearings before putting in place Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381927 Share on other sites More sharing options...
Truck Shop Posted October 8, 2017 Share Posted October 8, 2017 We set them at Zero end play. Especially three axle trailers which is all we have. The factory sets them with end play and usually we start changing out wheel seals within a month from new. The front and rear axles sweep in a turn and if there not zero those will go to leaking in short order. Most of the time we reset them as soon as a new trailer arrives. Truck Shop Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381931 Share on other sites More sharing options...
terry Posted October 8, 2017 Share Posted October 8, 2017 2 hours ago, Truck Shop said: We set them at Zero end play. Especially three axle trailers which is all we have. The factory sets them with end play and usually we start changing out wheel seals within a month from new. The front and rear axles sweep in a turn and if there not zero those will go to leaking in short order. Most of the time we reset them as soon as a new trailer arrives. Truck Shop Do you use a dial indicator? terry Quote Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381940 Share on other sites More sharing options...
Truck Shop Posted October 8, 2017 Share Posted October 8, 2017 3 hours ago, terry said: Do you use a dial indicator? terry Yes, But I have to laugh at all the concern over the possibility of over tight wheel bearing preload. It's a pretty simple job And one would have to really get carried away setting a hub that tight. It's an area that has been blown way out of proportion. And yes no one wants an accident but the Stemco rep agreed that zero is best. The Conmet and Stemco with the bearing spacer called Pro Torque is not reusable on a wheel seal change because that set up is only good on new bearings and races. If the spacer is reused you put the same sloppy end play back in that wheel end. We throw the spacer away and install the two nut, two locking washer set up that was used for years. That way the hub bearings are zeroed and we have no issues. What really causes bearings to fail is no lube or bad seal. New wheel ends are set up by machines these days and we have found new trailer hubs that have almost zero end play on one side and the other side set as much as .016 end play. Even had a rep from Hendrickson in the shop when we found two on the same trailer with leaking seals and the trailer was two months old. Both set at .014, He didn't have much to say, bad case of lock jaw. Truck Shop 1 Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381954 Share on other sites More sharing options...
terry Posted October 8, 2017 Share Posted October 8, 2017 Thanks for the explanation. terry Quote Link to comment https://www.bigmacktrucks.com/topic/51302-torque-specifications/#findComment-381964 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.