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bisley57

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  1. Finally found the problem,I changed the dissectant filter and rebuilt the purge valve,didn't make any difference.Soaped up the lines and found a leak at the control line coming off the compressor,fixed.I went to Bendix.com and read some excellent bulletins they have available there.I learned if your air drier purges more than once every 4 minutes at an idle,there is a problem.Bendix offers a lot of information on their valves,wish all suppliers did this.
  2. I have a bendix air dryer on a MR 688 and the air dryer seems to be "popping off" much more than usual.It use to do it very rarely but now it seems to pop every 2 or 3 minutes,way too much.No noticable air leaks in the system as it holds 90 -100 psi over night.I just read in another post there is a filter and unload kits at Truck Pro,I have never fooled with one before.Any input would be appreciated.
  3. From a mechanical point of view why do you have to range shift in gear,what is the physical difference of how the synchronizer acts if you range shift in neutral?
  4. Any thing I need to look for if I take the range cylinder apart?No springs or anything that may fly out?I would assume it is like a PTO engagement cylinder,a disc/piston with an o-ring.
  5. What is the proper maintenance of the sealed front hubs,the MR's in my past have all been oil lubricated with removable plug in the middle of a transparent cover.I believe this is a heavier suspension since the rear end has greaseable trunnions.
  6. Wondering if a little lube would help.I am thinking of taking the range shift valve filter out and see if it is dirty,if I can get to it.Thank you for your help.
  7. It only happens when the truck is range shifted the first time in the morning,with a loose yolk wouldn't it happen periodically all day?Is there an air regulator that can be adjusted to increase air pressure to the synchronizer cylinder to give it a little more uumph.
  8. How about a dirty range shift valve filter?
  9. Glad to have found this forum.I have recently been assigned a different truck,concrete pump truck on an MR 688 with an E-7 400 engine,with a T-310 transmission.The first time I range shift from lo to hi while leaving out a distinctive grind is heard from the transmission,but does not happen for the rest of the day.I believe the is the beginning of the end for the synchronizer.or am I wrong.I was taught to always pre-select ,please tell me if I am wrong,never to shift from lo to hi or hi to lo without being IN a gear.If the range select lever is changed while in neutral damage to the synchronizer will occur.This truck was operated by someone else for almost a year and I believe his shifting procedures were wrong,i.e.,range shifting in neutral.Now,with it grinding only one time in the morning could this mean there is a problem with the o-rings in the range shift valve or synchronizer cylinder due to some kind of binding or shrinkage over night?I am not sure for the proper part but the cylinder that is on the back of the transmission that has 2 air lines running to it,could the inside be dirty or scarred preventing problems in the morning?I am looking for some help although I think it is the beginnings of synchronizer failure.Any ideas?
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