ginpole Posted February 18 Share Posted February 18 My t318 is making a whining noise that doesn't sound good. I think I only notice it in low range but maybe I just can't hear it in high. The trans has 2 ptos hanging on it. I normally hit the neutral switch and put it in gear in the morning and let her warm up some, the noise is very noticeable then. Anyone that has ideas or something to check would be much appreciated. I'm thinking the worst and hoping for the best. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/ Share on other sites More sharing options...
ginpole Posted February 18 Author Share Posted February 18 Forgot to mention. This is a rebuilt model from a dealer vendor. I'm not sure of vendors name. Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546826 Share on other sites More sharing options...
Joey Mack Posted February 18 Share Posted February 18 I bet the PTO's need shimming.. can you do that or will you bring it back to the shop for a warranty repair? 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546827 Share on other sites More sharing options...
fjh Posted February 18 Share Posted February 18 I would check the backlash on the pto s. First! joey great minds ! 😂 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546828 Share on other sites More sharing options...
mechohaulic Posted February 18 Share Posted February 18 not always the easiest; I would get out the ole length of 3/4 heater hose while it's running (and no one will get in) ;; on the creeper and listen for a better location on the whine . case some youngster is wondering the heater hose is method from days gone by before all the fancy tech toools. one end to your best ear other follow along transmission (NOT follow the trans) I know how these sick minds think here, LOL it's difficult due to noise travels ; in some cases you can narrow down noise location. if the PTO is in whine mode at start up , it should be hot and louder after running. 100% agreement with the PTO idea. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546830 Share on other sites More sharing options...
mechohaulic Posted February 18 Share Posted February 18 then there are tec questions needing answers which may help ::: 1= have both PTO's been on there??2- has one been recently installed ?? 3- can you engage a PTO without it's application (pump/ hose etc) ?? 4- if so is there a difference in noise with either being engaged ?? 5- to shim requires specs and shims . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546831 Share on other sites More sharing options...
Joey Mack Posted February 18 Share Posted February 18 the transmission was re-built.. When I used to rebuild transmissions, I stripped them clean.. when the transmission was done I would hook air to it and bench test it for shiftability including range shifting. I would put the stick on it and hook shop air to the shift cover, run all lines correctly and use my home made crank to operate the transmission and all its gears and ranges. then I would set the PTO'(s) and be done.. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546833 Share on other sites More sharing options...
mechohaulic Posted February 18 Share Posted February 18 that A I crap will NEVER match old school methods. . can only give you a 97 grade Jojo == you forgot to add "and I paint it when done "!! LMAO 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546834 Share on other sites More sharing options...
Joey Mack Posted February 18 Share Posted February 18 Busted,, Yeah , I didnt ever paint the Mack tranny's.. they werent painted in the first place... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546835 Share on other sites More sharing options...
ginpole Posted February 18 Author Share Posted February 18 Thank you for the replies. I should add, it has 30-40000 miles on it since rebuild. The noise started fairly recently. Last week I did notice some loose nuts on both ptos and tightened everything up. Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546836 Share on other sites More sharing options...
Joey Mack Posted February 18 Share Posted February 18 I bet they were pre loaded, and pushed themselves loose, or they werent tight and they were side loaded.. Can you re-set the PTO's, or do you have to hire someone? Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546837 Share on other sites More sharing options...
mowerman Posted February 18 Share Posted February 18 I would’ve guessed PTO issues myself. They are usually noisy even when new you can hear them howling…. Good luck. Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546839 Share on other sites More sharing options...
ginpole Posted February 18 Author Share Posted February 18 Both pros have been on since rebuild. They both are powering winches, tomorrow I will run each separately without running winches and report back. Thank you guys. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546840 Share on other sites More sharing options...
fjh Posted February 18 Share Posted February 18 This is one of those occasions where loose is better than too tight! Bet you need to add a 15 thou gasket to one or both! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546841 Share on other sites More sharing options...
ginpole Posted February 20 Author Share Posted February 20 I loosened up both ptos almost to where they would start leaking, ran everything for a minute and noticed no change in sound. I drove it and the whine is there in low range but the second you shift into high range it stops whining. The sound doesn't change using the splitter. Does that still sound like a pto problem? Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546869 Share on other sites More sharing options...
Joey Mack Posted February 20 Share Posted February 20 Not sure, may not be.. another possible cause would be too much pre load on the rearward bearings.. I'm trying to stay away from going too deep into this. It's hard to diagnose this one without hearing it and driving the truck. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546870 Share on other sites More sharing options...
fjh Posted February 20 Share Posted February 20 Still think PTO how ever as Joey states Is a hard call ! That fact you hear it in neutral says something to me, Its in the main box and it only telegraphs in direct when driving ! just my thought! Check the drain plug for chunks and get some one to double check the Ptos in my opinion! Wouldn't want to rip a trans out with out evidence! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546875 Share on other sites More sharing options...
mrsmackpaul Posted February 20 Share Posted February 20 Late to this Reckon you have a crook bearing on the high range gear on the main shaft If the whine is only there in low range, this is the only time high range is spinning on the shaft In low range the low range gear is fixed on the shaft If it was mine I would pull the transmission out and lift it apart before something goes kahput and big dollars are needed Two things to remember are 1 I am only going off whats written here 2 it isn't my truck, so I'm not spending my money Good luck Paul Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546879 Share on other sites More sharing options...
Mean Green Posted February 21 Share Posted February 21 I like Paul’s answer it might be a counter shaft bearing ? My duplex in my b model will whine in high gear with aux stick in low then will go away when aux stick is shifted to high I know there was some failure at one time seeing part of my trans case has been welded back together 1 Quote If your going to be a bear be a grizzly Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546892 Share on other sites More sharing options...
mowerman Posted February 21 Share Posted February 21 Well, from where I said it sounds like it might be a little bit more work for you. Sorry…. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546894 Share on other sites More sharing options...
mowerman Posted February 21 Share Posted February 21 But then, again, through my experiences, it’s not necessarily something that you need to worry about immediately if at all just my opinion, especially if you’re running around locally good luck… bob Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546899 Share on other sites More sharing options...
Popular Post Joey Mack Posted February 21 Popular Post Share Posted February 21 I have an idea... Can you run the truck to temperature, then crawl under and touch the rear countershaft bearing covers looking for a hotter one, and also, check the rears for high heat. Sometimes the noise travels through the drive shaft.. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546903 Share on other sites More sharing options...
ginpole Posted February 21 Author Share Posted February 21 Thanks everyone. I still haven't nailed down what it is. I'm local so I've been using it some and hoping for a good outcome. I tried the hose trick and couldn't make any more sense of it. I also used a temp gun to check temps all over trans and both ptos and all temps are within + or - 10 degrees. We'll see what happens. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546906 Share on other sites More sharing options...
mowerman Posted February 22 Share Posted February 22 Thanks for letting us know bud… bob Quote Link to comment https://www.bigmacktrucks.com/topic/73878-transmission-whine/#findComment-546932 Share on other sites More sharing options...
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