Mack T318 grinding while shifting in mid gears

[Big Blue Mack]

I recently purchased a 06 CV713 with a t318 transmission. I’ve noticed while splitting the mid gears it will grind for a split second and go into gear. I’ve been trying to do some research but haven’t found much. What could be causing this? Thanks in advance!

[Joey Mack]

Dry o-rings in the shift cylinders.  They get neglected. I suggest buying oring kits and re sealing them.. also make sure the air pressure is correct, above 90 psi. 

[fjh]

On 4/28/2023 at 12:53 PM, Big Blue Mack said:

I recently purchased a 06 CV713 with a t318 transmission. I’ve noticed while splitting the mid gears it will grind for a split second and go into gear. I’ve been trying to do some research but haven’t found much. What could be causing this? Thanks in advance!

Check the rear yoke bolt first this is thirst indication of range pack failure! If the bolt is loose lock tight and tighten it! If not post back it’s a bit pricey to repair!

[fullfuel01]

worn out clutches. very very common for a T318. it can be done in place juste by removing the rear case of the transmission. PAI have an updated kit that make it last longer. I never had good luck with T318 mack.. I replace them with fuller

[Big Blue Mack]

Update I was not hitting the shift points correctly. My dad a more skilled driver drove the truck and it shifted like butter!

[fjh]

On 5/2/2023 at 10:38 AM, Big Blue Mack said:

Update I was not hitting the shift points correctly. My dad a more skilled driver drove the truck and it shifted like butter!

Old Guys RULE! 😁

[doubleclutchinweasel]

Oh no!  Don't tell me we were trying to learn how to double-clutch that one!  LOL!

Glad you figured it out!

[Joey Mack]

Oh Hell..  DCW..  you nailed it..  I bet I'm the only guy here that double clutches...

[doubleclutchinweasel]

4 minutes ago, Joey Mack said:

Oh Hell..  DCW..  you nailed it..  I bet I'm the only guy here that double clutches...

Double-Clutch, Float, whatever!  Still have to do it right!

I'm just glad he didn't have to start spending money on that thing!

[Joey Mack]

Ive gotton to meet a lot of drivers that came from an Eaton tranny, and go to a Mack Tranny, and had a bit of a learning curve.  They said it was not as smooth to shift.. That's an understatement..  

[doubleclutchinweasel]

4 hours ago, Joey Mack said:

Ive gotton to meet a lot of drivers that came from an Eaton tranny, and go to a Mack Tranny, and had a bit of a learning curve.  They said it was not as smooth to shift.. That's an understatement..  

The Mack just always felt “normal” to me. Never had an issue with snEaton, though. Of course, all my Mack experiences had 2 sticks!

[fjh]

On 5/8/2023 at 4:06 PM, doubleclutchinweasel said:

The Mack just always felt “normal” to me. Never had an issue with snEaton, though. Of course, all my Mack experiences had 2 sticks!

Tough to beat a fuller!

[doubleclutchinweasel]

5 hours ago, fjh said:

Tough to beat a fuller!

Yeah. They just work.