M54A1 Posted October 20, 2007 Share Posted October 20, 2007 I have a single axle B61, I had noticed a vibration at higher speeds and found that the pinion shaft had a little bit of slack up and down when I would push on the drive shaft, How can I get rid of the slack? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/2985-pinion-slack/ Share on other sites More sharing options...
Freightrain Posted October 22, 2007 Share Posted October 22, 2007 When I bought my B, the seal started leaking on the pinion. Once I got the driveshaft off, I was able to wobble the pinion slightly. Seems someone had it apart before and didn't tighten the nut enough. I put a new seal in and then got the nut one more notch(for cotterpin) and it's been fine for 5 yrs now. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2985-pinion-slack/#findComment-14623 Share on other sites More sharing options...
Lmackattack Posted October 22, 2007 Share Posted October 22, 2007 THE BOLT THAT HOLDS THE YOKE TO THE SHAFT MAY BE LOUSE OR BACKED OFF A BIT. BEST WAY TO CHECK IS TO REMOVE THE U JOINT AND TIGHTEN THE BOLT WITH AN AIR RATCHET. IF THAT BOLT COMES LOUSE IT GIVES THE BEARINGS SLACK AND THE PINION CAN MOVE A LITTLE. ALSO IF THERE WAS ALOT OF SLACK THE SEAL MAY BE BAD. LOOK FOR OIL LEAKS UNDER THAT YOKE AND CHECK YOUR DIFF OIL LEVEL JUST TO BE SAFE Quote Link to comment https://www.bigmacktrucks.com/topic/2985-pinion-slack/#findComment-14625 Share on other sites More sharing options...
Freightrain Posted October 24, 2007 Share Posted October 24, 2007 I'm not sure what holds the preload on the pinion bearings? solid sleeve or crush sleeve(like a Ford 9"). The nut is cotterpinned, so in reality it should not come loose unless there is issues inside(like bearings or crush sleeve).I didn't have access to big air impact so a 3/4" breaker bar did the job. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2985-pinion-slack/#findComment-14669 Share on other sites More sharing options...
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