Problems with a axial scx10 front axle?

[axial 4x4 crawler]

Hello,
I have an Axial scx-10 "honcho" and it has serious shaking problems with the front axle, I don't really know what this could be. A bad bearing? Or something worse, but I have a tekin FX-R w/ 35 turn motor (brushed), runs 2s lipo (only for long run time). My trans. gearing is set to stock spur and a 17 tooth pinion again only for torque. Using stock driveshafts, upgraded aluminum 12.3 mm links and a few other vanquish products, I realized this problem after I drove the truck all day then it sat for a week. If it has anything to do with the axle I can fix it, but if anyone could help, I would really appreciate it. Forgot to mention I 4-linked the front suspension for a lot more flex. G-made 104 mm shocks all around. RC4wd irok 1.9 superswampers with wagon wheels oem (RC4wd), G.H. alum. servo horn, and a droop kit for the suspension.

 

[jollyjeeper]

Sounds like a bearing problem. Could also be a wheel weight out of balance.

 

[axial 4x4 crawler]

So replace the bearings and add some oil, also you mention wheel balance problem, is that "torque twist" in the axles due to too much torque? And I don't have any wheel weights in the front tires, I should though because my truck rolls down a lot of hill tops. Lol. Also it has been know that dirt gets in the axle's due to holes in the axle itself, Do think those bearings and inner gears are rusted out? - axial 4x4 crawler

 

[jollyjeeper]

So replace the bearings and add some oil, also you mention wheel balance problem, is that "torque twist" in the axles due to too much torque? And I don't have any wheel weights in the front tires, I should though because my truck rolls down a lot of hill tops. Lol. Also it has been know that dirt gets in the axle's due to holes in the axle itself, Do think those bearings and inner gears are rusted out? - axial 4x4 crawler

I doubt the gears are rusted and causing this. First thing I'd do is pull the wheels and check the knuckle bearing, then work your way inside to the diff. Torque twist effects the chassis leaning under power, so that's a different issue than
described. A bent shaft or cup could also cause a wobble. Also, check the tire bead and make sure the bead is seated good.

 

[axial 4x4 crawler]

Thank you,
I checked the bead-locks and those are not the problem, so I will move down into the axle later, but Is a bent shaft the inner turning shaft going from the diff. locker to the knuckles or is it in the knuckle itself that holds the "dog-bone" axle? Thank you for your support and help, I will check those bearings and/or the cups or a bent shaft, and get back on the forums after I inspected the axle. - axial 4x4 crawler.

 

[Rorro]

are your driveshaft balanced? the threaded pins should be aligned in both sides (axle and transfer sides)

 

[sidehiller]

are your driveshaft balanced? the threaded pins should be aligned in both sides (axle and transfer sides)

I am starting to see this problem being asked more frequently lately.

I would check to see if your drive shafts are phased (lined up) if I was to but money on your problem it would be on this.

Sent from my GT-I9100M using Tapatalk 4 Beta

 

[axial 4x4 crawler]

thank you,
I have heard the problems with scx10 driveshafts before, It may due to the way they are designed but the pins are not aligned so I will fix that right now. and that didn't seem to fix the shaking problems, You sed line-up my driveshafts, does that mean both pins are directly lined up? I don't see how to fix it because I maid sure that the pins are lined up. Unless I didn't fix it right. thank you, I appreciate it.

 

[Brandon]

You are running longer shocks. Now the driveshafts are at too steep of an angle to perform smoothly. Put the stock shocks back on or something within the same range as the stock shocks.

 

[axial 4x4 crawler]

Well I cant because I already sold those shocks and besides I have had those shocks on there for about 6 months and I have never seen the problem before, I think I remember when I had the old shocks and the rear axle shaked but I fixed that by sending it back to the factory (that's when I had it new) and they fixed it by putting a whole new axle on but I don't know why they did that. But for one thing these shocks are lowered on the customized lower mounts that I bought from level 3 racing and it goes on the shock hoops. But you might be right I will check that and see if that's the problem and I just got over the military theme build so I don't have much money to spend but I can lower these shocks to give me the same ride height as stock lower or can ever flip them to give me more height they seem to be a little top heavy with-out the lower kit I have for it so I just go from there. Thank you for your time and help, I do appreciate it. - axial 4x4 crawler.

 

[craddock35]

Pics and a vid would help."thumbsup"

 

[axial 4x4 crawler]

Yeah your right I get a few pics up as soon as I can I don't have a camera so I have to find one. Sorry

 

[C*H*U*D]

Put the truck on something that will allow you to run it with the tires off the ground. Then run the truck slowly. Turn your steering while it's running also to see if it's a problem with the dogbones or CVD's.

It's often easier to see what's going on if the truck is on your bench, then it is trying to follow along while it's driving. I bet you spot the problem right away.

 

[mszymanski25]

I found this thread searching for the solution to my problem. I posted a thread a few days ago describing a similar issue. The problem for me becomes more pronounced when I turn the wheels. I have run the truck with the wheels off the ground, and at a slow speed with the wheels turned, you can see the rotation at the wheel almost stop, then pick back up. The spur gear doesn't seem to be effected, seems to spin at a constant pace. With the wheels turned, and the truck off the ground, the axle actually shakes, fairly violently. I guess my real question is, did Axial 4x4 crawler find a solution to the problem, because I'm totally stumped. I am running the stock ICON shocks, and treps, upgraded to CVDs, but I can turn the wheels further than the servo does, so i don't think I have maxed out the turning angle. Any Info would be greatly appreciated.

 

[TacoCrawler]

Besides the possibility of the out of phase drive shaft...

Could be that it has something to do with the front drive shaft's angle
coming out of the axle housing's output shaft.
The front DS's output angle is more extreme then out back.

I added the small spacer(s) to the upper front links (Axial link kit/optional)
and that reduced the drive shaft's angle some.

Prior to altering the upper front links...
I discovered that when the suspension was compressed fully
the drive shaft angle was reduced...
the axle shaking seemed to lessen.
Also only notice the axle shake when the Honcho is off the ground,
and when my 100mm shocks are fully extended (droop).


Checked my drive shaft for operational smoothness...
and that it is in phase with both universal pins.
and I have no more shaking.

so I'll bet my money that checking/correcting the DS's phasing and angle will reduce the axle shake.

keep in mind...
if you lengthen the upper links slightly...
you caster angle will change to near zero.
Not really a big deal on a crawler...
but higher speeds can affect steering input,
making steering overly sensitive.

after market "C" hubs with more castor may be in the cards for me.

 

[micro racer]

Do you have a three link up front? Because before I went to four link the ball end slid in the mount. It actually popped out once, so that could be it. The axle rotated forward and back, which to me sounds like what you have got.

 

[jhtoy]

I had this problem on a 1.9 scaler I recently built with scx10 axles.Turns out the hex area on my rc4wd wheels were hitting the knuckles.I used a thicker wheel hex to solve the problem.Probably a long shot but check it out.

 

[crawl-o-matic]

Well I cant because I already sold those shocks and besides I have had those shocks on there for about 6 months and I have never seen the problem before, I think I remember when I had the old shocks and the rear axle shaked but I fixed that by sending it back to the factory (that's when I had it new) and they fixed it by putting a whole new axle on but I don't know why they did that. But for one thing these shocks are lowered on the customized lower mounts that I bought from level 3 racing and it goes on the shock hoops. But you might be right I will check that and see if that's the problem and I just got over the military theme build so I don't have much money to spend but I can lower these shocks to give me the same ride height as stock lower or can ever flip them to give me more height they seem to be a little top heavy with-out the lower kit I have for it so I just go from there. Thank you for your time and help, I do appreciate it. - axial 4x4 crawler.

Brandon's right...it just took 6 months of running the wrong length shocks to get to where you are now...there's no way you can lower the shocks enough. Rebuild the diff.

 

[nigelpheron]

Did you ever solve this shacking at steering end-point problem? If so, please post waht you did.