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robinson racing steel spur gear on a t-maxx

Old 04-07-2008, 08:16 AM
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saubererik
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Default robinson racing steel spur gear on a t-maxx

i had purchased a 72 tooth robinson racing spur gear and installed as directions said "remove very little of edge of transmission hex shaft"so i did a little too much and the gear and slipper plates wobble like so bad it rubbed on the battery box. anyone else had this happen to them
Old 04-07-2008, 08:21 PM
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Nighthawk z450
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Default RE: robinson racing steel spur gear on a t-maxx

wow, you sure you have your washers in the right places? that sounds odd. i never cut any shaft down with mine. im running a robinson haft though. but i have ran with the stocker without triming anything without problems.
Old 04-07-2008, 11:14 PM
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HpiDrifter420
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Default RE: robinson racing steel spur gear on a t-maxx

im running the robinson racing spur and have no problems with it. a re you sure that you installed it correctly? heres a pic of mine installed
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Old 04-08-2008, 05:47 AM
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RCCanuck
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Default RE: robinson racing steel spur gear on a t-maxx

get a new shaft
Old 04-08-2008, 06:52 AM
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systemlord
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Default RE: robinson racing steel spur gear on a t-maxx

What is a hex shaft?
Old 04-08-2008, 07:04 AM
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Default RE: robinson racing steel spur gear on a t-maxx

ORIGINAL: systemlord

What is a hex shaft?
The shaft the spur is on...AKA the top shaft AKA the 2 speed shaft...
http://www3.towerhobbies.com/cgi-bin...7&I=LXJG99&P=K
Old 04-08-2008, 07:23 AM
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systemlord
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Default RE: robinson racing steel spur gear on a t-maxx

ORIGINAL: thesouth1

ORIGINAL: systemlord

What is a hex shaft?
The shaft the spur is on...AKA the top shaft AKA the 2 speed shaft...
http://www3.towerhobbies.com/cgi-bin...7&I=LXJG99&P=K
Ah ok, they call that the Topshaft. Its been awhile since I have worked on the tranny, a long time. All my gears in my tranny look like the one in the picture, CNC cut from 1 3/4 inch steel then hardened for stength.
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Old 04-08-2008, 12:08 PM
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saubererik
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Default RE: robinson racing steel spur gear on a t-maxx

im putting the forward only conversion on it soon does that replace that shaft?
Old 04-08-2008, 04:20 PM
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systemlord
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Default RE: robinson racing steel spur gear on a t-maxx

ORIGINAL: saubererik

im putting the forward only conversion on it soon does that replace that shaft?
Yes, you have to get a forward only shaft that has a gear on it, its a really cheap ($10 dollars at Tower) part. I'm not sure if the forward only shaft is the same for all traxxas trucks and buggies? You can either use the existing shaft leftover from tearing apart your tranny and use the hardend aluminum gear, or just buy a new shaft with plastic gear.
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Old 04-08-2008, 07:14 PM
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Nighthawk z450
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Default RE: robinson racing steel spur gear on a t-maxx


ORIGINAL: systemlord

ORIGINAL: saubererik

im putting the forward only conversion on it soon does that replace that shaft?
Yes, you have to get a forward only shaft that has a gear on it, its a really cheap ($10 dollars at Tower) part. I'm not sure if the forward only shaft is the same for all traxxas trucks and buggies? You can either use the existing shaft leftover from tearing apart your tranny and use the hardend aluminum gear, or just buy a new shaft with plastic gear.
i beleave he's refering to replacing the "topshaft thats damaged" not the forward only shaft, its 2 different one.

so to anwser your ?, no. you need a new topshaft.
Old 04-08-2008, 11:19 PM
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systemlord
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Default RE: robinson racing steel spur gear on a t-maxx

ORIGINAL: Nighthawk z450


ORIGINAL: systemlord

ORIGINAL: saubererik

im putting the forward only conversion on it soon does that replace that shaft? [/b]
Yes, you have to get a forward only shaft that has a gear on it, its a really cheap ($10 dollars at Tower) part. I'm not sure if the forward only shaft is the same for all traxxas trucks and buggies? You can either use the existing shaft leftover from tearing apart your tranny and use the hardend aluminum gear, or just buy a new shaft with plastic gear.
i beleave he's refering to replacing the "topshaft thats damaged" not the forward only shaft, its 2 different one.

so to anwser your ?, no. you need a new topshaft.
im putting the forward only conversion on it soon does that replace that shaft?
It seems he is going to be using the forward only shaft, the forward only conversion has nothing to do with the topshaft. You will need another topshaft also, the forward only conversion is completely different from the topshaft.

Old 04-09-2008, 09:48 AM
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saubererik
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Default RE: robinson racing steel spur gear on a t-maxx

ok thanks everyone the foc kit will stop the bucking at idle too right
Old 04-09-2008, 11:28 AM
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charlieboy
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Default RE: robinson racing steel spur gear on a t-maxx

I'm not sure why you'd need to modify the shaft, but if its bent replace it. I had the problem with the RR spur brushing against the battery box tho. the clearance in that area is quite close. I took off the battery box cover and used a saw and a dremel to cut a piece off, been working perfect since!!
Old 04-09-2008, 02:53 PM
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systemlord
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Default RE: robinson racing steel spur gear on a t-maxx


ORIGINAL: saubererik

ok thanks everyone the foc kit will stop the bucking at idle too right
Yes it will stop the bucking, I remember when my T-Maxx did that and hated it. It happens when your idle is too high that the clutch engages and disengages over and over again.
Old 04-10-2008, 05:12 AM
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Default RE: robinson racing steel spur gear on a t-maxx

when you buy a steel spur gear do you need a hardened steel clutch bell?
Old 04-10-2008, 08:07 AM
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systemlord
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Default RE: robinson racing steel spur gear on a t-maxx


ORIGINAL: jasytosy

when you buy a steel spur gear do you need a hardened steel clutch bell?
No you don't and I'll tell you why, I have the Robinson Racing hardend steel spur gear 72T. I was running my truck normally and notice some strange sound coming from my truck, I had noticed that the edge (around the bell, not the teeth) of the clutchbell was chewed pretty bad. Then I saw that there was no e-clip holding the clutchbell on, so this means that as my clutchbell tried to slid off my steel spur gear would slam the clutch bell back everytime it moved forward. My clutch bell had visable damage, but my hardend steel spur gear had not even a mark on it. So you see if you use a R&R spur gear don't use a clutchbell from the same brand. I think the Traxxas clutchbells are weaker that R&R hardend steel spur gears and I'm going to keep it that way.
Old 06-11-2009, 12:10 PM
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Default RE: robinson racing steel spur gear on a t-maxx


ORIGINAL: saubererik

ok thanks everyone the foc kit will stop the bucking at idle too right
Generally, no. It is usually the clutch bell that is engaging when the truck is jumping at idle, not the forward/reverse clutches. If your truck bucks at idle that means it is idling too high. That said, bucking doesn't hurt it at all, so if it runs well, accelerates well, and hits a good top speed, I wouldn't bother to tune the bucking out. It might be a little annoying, but I would rather have a truck that runs well and jerks a bit at idle than a truck that idles well but doesn't run for crap on throttle.

The Topshaft is TRA4992, BTW, assuming you have a 2.5 maxx. It is different on the 3.3.


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