RCCrawler Forums

dranger962000 · 01-04-2010, 08:22 PM

what is the best way to get rid of all the slop in the diffs?
there seems to be more than when i got it
there also seems to be slop in the tranny
are there any easy ways to fix this?

jasontech17 · 01-04-2010, 08:54 PM

on my axial diff the front drive shaft came loose and the drive shaft moved away from the diff and the pinion stoped touching the ring gear inside the diff all I had to do is move the drive shaft to the correct place (very close to pinion bearing on diff ) and the problem was fixed. but the transmission problem could be the motor is adjusted too far away from spur gear? what kind of tranny do you have ?

robsdak · 01-04-2010, 09:10 PM

to answer this simply, yes and no. LOL new gears may be in order, too much wear, not enough grease on the 1st build.

you might be able to tighten them up, like i did. when i built mine, i was very unhappy with the slop. actually kinda pissed off, thinking i just wasted money on a POS, but over time i have learned there is some slop needed. but to tighten them up, use shims, washers of different thicknesses and shim out either the bevel gear(AX 30392, page 7 in the manual) to the bearing(AXA1221, page 8 in the manual). the trick to this one is to find a shim the sits on the little lip of the gear. see below for warning.....

or the other way...

shim bearing (AXA1221) where it sits in the axle housing. the trick to this one is to find a shim the sits on the little lip of the axle, but not as wide as the bearing , as it will rub the output shaft and cause drag. may have to dremel it out. see warning below........

Warning- shimming too much makes it difficult to install drive shafts. may have to dremel flat spot larger.

when i built mine, i used Penn's Synthetic Reel grease. didn't use grease from Axial, reason, i have Penn and Shimano Calcutta reels that are several years old and have almost no wear showing. so logic told me , the better the grease the better the protection. it also displaces water like there is no tomorrow. and yes i filled the full, not just the little dabs of grease here and there that the directions call for.

jasontech17 · 01-04-2010, 09:39 PM

ROBSDAK .................. You need to be careful when shimming a diff. If you shim the PINION gear too close to the RING gear you could cause binding or diff housing to brake. If you want to shim up diff you must take the time to measure things and do It right!! I would think that axial would do the research to set up the diffs correctly!!! How are you going to measure the pinion depth ? how are you going to measure rolling torque ?? by feel ?? Are you going to use machined washers ??

CreepyCrawl · 01-04-2010, 09:55 PM

exesivefire used this mod to tighten up the top shaft in his current build...scroll to post number 47:

Exesive's MSD Hybrid chassis build

jasontech17 · 01-04-2010, 10:00 PM

I thought we where talking about the diff ?

dranger962000 · 01-04-2010, 10:08 PM

sounds like shimming is a pain but maybe i will try it out.
sounds like its just like in a real diff you want it tight but not to tight or loose but not to loose

crawler-c · 01-05-2010, 01:56 AM

have you seen these?

http://www.rccrawler.com/forum/showthread.php?t=164999

Terranaut · 01-05-2010, 06:43 AM

There is slop or freeplay at virtually every point on an AX-10. Transmission idler gears (internal) are not adjustable, driveshaft universals and splines always have play, ring and pinion stock installation has play but can be shimmed, Felsenfest diff spool or similar should fix it there, CVD's have a lot of play, sometimes hexes cannot be kept tight. It all adds up.

If you have the stock aluminium diff spools that is probably the main culprit. They wear quickly and will eventually spin. The axles can migrate outwards so they are only half engaged in the spool, so they wear quicker. Put something in the CVD cups to push the axles inward, they engage better and last longer. I use a tiny piece of fuel tube.

Cheers.

CreepyCrawl · 01-05-2010, 08:14 AM

Quote:

Originally Posted by jasontech17

I thought we where talking about the diff ?

Quote:

Originally Posted by dranger962000

there also seems to be slop in the tranny
are there any easy ways to fix this?

robsdak · 01-05-2010, 04:34 PM

Quote:

Originally Posted by jasontech17

ROBSDAK .................. You need to be careful when shimming a diff. If you shim the PINION gear too close to the RING gear you could cause binding or diff housing to brake. If you want to shim up diff you must take the time to measure things and do It right!! I would think that axial would do the research to set up the diffs correctly!!! How are you going to measure the pinion depth ? how are you going to measure rolling torque ?? by feel ?? Are you going to use machined washers ??

jason, i really appreciate that you took the time to read my post, but 1st off, i am not new to this. i have built several axles and if Axial would TAKE more time in doing their research regarding tolerances, and making them a little tighter there would be no need for this information. everything in this hobby can be improved upon, all it takes is a little know-how.

yes the shims (washers) used were machined and were bought from McMaster-Carr. not from your local Ace Hardware. and i just might own a tool or two for measuring.

you make building RC's sound like a rocket science, but in reality all it takes is a little common sense and reading the directions. being that i am 41 yrs.old i have a little experience in several different hobbies, makes all the difference.

i have done this on several other models that i run, Axial AX10, AE TC3, AE B2 Buggy 2 AE Gold Pans that i have rebuilt. IMO, tighter tolerances and proper grease makes parts last longer and run smother but improves the overall handling . ie: steering.

jasontech17 · 01-05-2010, 08:41 PM

Robsdak.............I think your ideas are meant to be help full. But I think any advice I would give someone else should be something that would help them have more fun with this hobby and make there rig run better. So my OPINION is different then yours. I do not think this hobby is rocket science but I do belive in doing things the right way and not just put a shim here and a shim there. I do not mean to make you upset but I think things need to be done correctly !!

robsdak · 01-05-2010, 11:08 PM

Quote:

Originally Posted by jasontech17

Robsdak.............I think your ideas are meant to be help full. But I think any advice I would give someone else should be something that would help them have more fun with this hobby and make there rig run better. So my OPINION is different then yours. I do not think this hobby is rocket science but I do belive in doing things the right way and not just put a shim here and a shim there. I do not mean to make you upset but I think things need to be done correctly !!

didn't upset me at all. mine are not ideas, but a fact, the fact that i have done it. they were meant to help to have more fun in this hobby, i can't see how they wouldn't help? that is the #1 cause of gear failure. gears that "mesh" together last longer, save money and time. it is not a difficult concept to grasp.

correctly? explain a better way to take up the "slop" in something, other than machining it yourself to tighter tolerances? there are a lot of this in this hobby that can/should be improved upon, but companies are worried about meeting the bottom line, which is money. and if they would research a little more, plan better and make better parts. there would be no need to "fix" simple mistakes.

this is one of the reasons why i don't post here as often, it turns into a pissing match.

01-04-2010, 08:22 PM	#1
dranger962000 Rock Stacker Join Date: Dec 2009 Location: denver Posts: 53	sloppy diffs and tranny what is the best way to get rid of all the slop in the diffs? there seems to be more than when i got it there also seems to be slop in the tranny are there any easy ways to fix this?

01-04-2010, 08:54 PM	#2
jasontech17 Pebble Pounder Join Date: Nov 2009 Location: ft collins Posts: 123	on my axial diff the front drive shaft came loose and the drive shaft moved away from the diff and the pinion stoped touching the ring gear inside the diff all I had to do is move the drive shaft to the correct place (very close to pinion bearing on diff ) and the problem was fixed. but the transmission problem could be the motor is adjusted too far away from spur gear? what kind of tranny do you have ?

01-04-2010, 09:10 PM	#3
robsdak Pebble Pounder Join Date: Jan 2009 Location: Crestview Posts: 166	to answer this simply, yes and no. LOL new gears may be in order, too much wear, not enough grease on the 1st build. you might be able to tighten them up, like i did. when i built mine, i was very unhappy with the slop. actually kinda pissed off, thinking i just wasted money on a POS, but over time i have learned there is some slop needed. but to tighten them up, use shims, washers of different thicknesses and shim out either the bevel gear(AX 30392, page 7 in the manual) to the bearing(AXA1221, page 8 in the manual). the trick to this one is to find a shim the sits on the little lip of the gear. see below for warning..... or the other way... shim bearing (AXA1221) where it sits in the axle housing. the trick to this one is to find a shim the sits on the little lip of the axle, but not as wide as the bearing , as it will rub the output shaft and cause drag. may have to dremel it out. see warning below........ Warning- shimming too much makes it difficult to install drive shafts. may have to dremel flat spot larger. when i built mine, i used Penn's Synthetic Reel grease. didn't use grease from Axial, reason, i have Penn and Shimano Calcutta reels that are several years old and have almost no wear showing. so logic told me , the better the grease the better the protection. it also displaces water like there is no tomorrow. and yes i filled the full, not just the little dabs of grease here and there that the directions call for.

01-04-2010, 09:39 PM	#4
jasontech17 Pebble Pounder Join Date: Nov 2009 Location: ft collins Posts: 123	ROBSDAK .................. You need to be careful when shimming a diff. If you shim the PINION gear too close to the RING gear you could cause binding or diff housing to brake. If you want to shim up diff you must take the time to measure things and do It right!! I would think that axial would do the research to set up the diffs correctly!!! How are you going to measure the pinion depth ? how are you going to measure rolling torque ?? by feel ?? Are you going to use machined washers ??

01-04-2010, 09:55 PM	#5
CreepyCrawl I wanna be Dave Join Date: Oct 2006 Location: Centered Posts: 2,082	exesivefire used this mod to tighten up the top shaft in his current build...scroll to post number 47: Exesive's MSD Hybrid chassis build

01-04-2010, 10:00 PM	#6
jasontech17 Pebble Pounder Join Date: Nov 2009 Location: ft collins Posts: 123	I thought we where talking about the diff ?

01-04-2010, 10:08 PM	#7
dranger962000 Rock Stacker Join Date: Dec 2009 Location: denver Posts: 53	sounds like shimming is a pain but maybe i will try it out. sounds like its just like in a real diff you want it tight but not to tight or loose but not to loose

01-05-2010, 01:56 AM	#8
crawler-c Rock Stacker Join Date: Nov 2009 Location: Europe Posts: 53	have you seen these? http://www.rccrawler.com/forum/showthread.php?t=164999

01-05-2010, 06:43 AM	#9
Terranaut Quarry Creeper Join Date: Sep 2008 Location: Kuala Lumpur, Malaysia Posts: 372	There is slop or freeplay at virtually every point on an AX-10. Transmission idler gears (internal) are not adjustable, driveshaft universals and splines always have play, ring and pinion stock installation has play but can be shimmed, Felsenfest diff spool or similar should fix it there, CVD's have a lot of play, sometimes hexes cannot be kept tight. It all adds up. If you have the stock aluminium diff spools that is probably the main culprit. They wear quickly and will eventually spin. The axles can migrate outwards so they are only half engaged in the spool, so they wear quicker. Put something in the CVD cups to push the axles inward, they engage better and last longer. I use a tiny piece of fuel tube. Cheers.

01-05-2010, 08:41 PM	#12
jasontech17 Pebble Pounder Join Date: Nov 2009 Location: ft collins Posts: 123	Robsdak.............I think your ideas are meant to be help full. But I think any advice I would give someone else should be something that would help them have more fun with this hobby and make there rig run better. So my OPINION is different then yours. I do not think this hobby is rocket science but I do belive in doing things the right way and not just put a shim here and a shim there. I do not mean to make you upset but I think things need to be done correctly !!

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