RCCrawler Forums

350oshin · 09-06-2011, 07:13 PM

i have a scx10 with a handbros kit and front and rear 4 link and i can turn right great but left it has very little throw, i tried different servo horns and i just cant figure it out.

rod-211 · 09-06-2011, 09:31 PM

Make sure you installed everything correctly or try adjusting your EPA on the servo.

Rook82 · 09-07-2011, 05:24 AM

Some servo horns can hit the HB mount when the steering turns to the left. Some servos can be worse then others for this as well. Try taking a picture of it and posting, that can be very helpful for people to see what the issue may be. Does it turn ok when the rig is off the ground (less pressure on tires to keep them from turning)?

350oshin · 09-07-2011, 01:23 PM

i have the epa set on 100% on my 4pk and am using a hs-645mg servo has enought power to turn right but seems like i dont have enough throw with the losi comp crawler shocks it has more travel plus i am using traxxas links on the 4 link those extend out the axels even more. it gets worse as i raise the car.

350oshin · 09-07-2011, 01:24 PM

when im drooped out it has almost no steering the servo is turning but my geometry is all of so its not working.

SMR 510RR · 09-07-2011, 01:37 PM

Is your servo mounted on the chassis? Sounds like it is. If you are using a 3 link or 4 link setup that doesnt have a panhard bar then you are going to have problems with the steering while the axle moves through its travel.

Take a pic of your setup so we can see what is going on.

Rook82 · 09-07-2011, 04:43 PM

I just noticed something in your initial post. It says you have a Hand Bro's steering kit but front and rear 4 link. If you are using the Hand Bro kit, it is a 3 link. If you dropped that and made it two upper links, then things will not work right. The axle needs to shift side to side with the track bar. Using a 4 link upper keeps the axle centered. I would think you are having some binding in links, etc because of this. Pictures would definitely help. And the hitec 645 is not a very strong servo. Chassi mounted servos work harder then axle mounted ones, some of the servo power gets wasted in chassi shifting, etc. And if things are not setup just right, then it may not be up to working or moving the wheels correctly. I would just try and get a pic on here so it can be looked at and diagnosed.

johnnyh66 · 09-07-2011, 05:05 PM

Is your servo on backwards?

I have a CMS w/No panhard bar... it has plenty of throw and steers fine with a 4 link. I'll try to get a pic tonight.

When I first put it together, I had the servo on backwards and very limited throw.

350oshin · 09-07-2011, 08:26 PM

well my freind has the same 4 link setup as mine as his is perfect just mine has a longer shock

350oshin · 09-07-2011, 08:27 PM

lol big pics 56k run away! this is how it looks after i cleaned it lol

Anti Hero · 09-07-2011, 08:34 PM

Not sure about the steering but a little wd40 would do you some good lol

SC Convert · 09-07-2011, 08:40 PM

Is the ball cup hitting the chassis when you turn left? The point of view in your third pic makes it look like it would. If so is there enough clearance to mount the ball on the bottom side of the servo horn?

Nvm after closer look is it the servo horn itself hitting the chassis?

Anti Hero · 09-07-2011, 08:44 PM

One thing i did notice is that you have your beadlock rings on the wrong side.

350oshin · 09-07-2011, 08:55 PM

i wanted the smaller ring outside.....lol and the wd-40 gets washed off everytime lol

Anti Hero · 09-07-2011, 09:05 PM

Quote:

Originally Posted by 350oshin

i wanted the smaller ring outside.....lol and the wd-40 gets washed off everytime lol

lol, The big ring rubs on the inside of mine, I wonder if thats doing anything with your steering. pull off the wheels and try going full lock

350oshin · 09-07-2011, 09:39 PM

no its not rubbing

scorpion_ax · 09-07-2011, 10:45 PM

well i run a home made chassis mount steering and have not had any issues with the amount one way or another

to me it looks as tho your steering link when centered is more to one side then the other which would give you lots of thro on the opposite side and less on the shorter side

you may want to either shorten your steering drag link and re center the servo horn and give that a try

and might i say HOLY drive shafts those are huge

iamsuperbleeder · 09-07-2011, 10:52 PM

Quote:

Originally Posted by 350oshin

I think this photo gives all that's needed to diagnose. My advice? Put a shorter link from the servo horn to the knuckle and get the servo horn as straight as possible (parallel with frame rails) as you can at ride height. If it's off to one side like it is there, and I'm assuming you're wheels are straight in this photo, you'll have a ton of throw in one direction (looks like when turning right), but not a lot in the other (very little to the left), which is just what you're describing

Big Daddy · 09-07-2011, 11:20 PM

I'll second that one ^^. Looks like you are losing some throw with the servo horn not being centered when the tires are centered.
Looks like a well used rig.

iamsuperbleeder · 09-07-2011, 11:46 PM

and maybe it's just the camera angle, but that looks like a VERY short servo horn too

like, shorter than the stock one that came on my RTR

09-06-2011, 07:13 PM	#1
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	my crawler has very little steering i have a scx10 with a handbros kit and front and rear 4 link and i can turn right great but left it has very little throw, i tried different servo horns and i just cant figure it out.

09-07-2011, 05:05 PM	#8
johnnyh66 Scale Detail Engineering Join Date: Apr 2010 Location: Turtle Island Posts: 5,573	Is your servo on backwards? I have a CMS w/No panhard bar... it has plenty of throw and steers fine with a 4 link. I'll try to get a pic tonight. When I first put it together, I had the servo on backwards and very limited throw. Last edited by johnnyh66; 09-07-2011 at 05:08 PM.

09-07-2011, 08:40 PM	#12
SC Convert Quarry Creeper Join Date: May 2011 Location: Ak Posts: 296	Is the ball cup hitting the chassis when you turn left? The point of view in your third pic makes it look like it would. If so is there enough clearance to mount the ball on the bottom side of the servo horn? Nvm after closer look is it the servo horn itself hitting the chassis? Last edited by SC Convert; 09-07-2011 at 08:45 PM.

09-06-2011, 09:31 PM	#2
rod-211 Pebble Pounder Join Date: Jan 2010 Location: Joliet Posts: 136	Make sure you installed everything correctly or try adjusting your EPA on the servo.

09-07-2011, 05:24 AM	#3
Rook82 RCC Addict Join Date: Jul 2009 Location: Dover, NH Posts: 1,153	Some servo horns can hit the HB mount when the steering turns to the left. Some servos can be worse then others for this as well. Try taking a picture of it and posting, that can be very helpful for people to see what the issue may be. Does it turn ok when the rig is off the ground (less pressure on tires to keep them from turning)?

09-07-2011, 01:23 PM	#4
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	i have the epa set on 100% on my 4pk and am using a hs-645mg servo has enought power to turn right but seems like i dont have enough throw with the losi comp crawler shocks it has more travel plus i am using traxxas links on the 4 link those extend out the axels even more. it gets worse as i raise the car.

09-07-2011, 01:24 PM	#5
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	when im drooped out it has almost no steering the servo is turning but my geometry is all of so its not working.

09-07-2011, 01:37 PM	#6
SMR 510RR I wanna be Dave Join Date: Dec 2009 Location: San Francisco Posts: 2,236	Is your servo mounted on the chassis? Sounds like it is. If you are using a 3 link or 4 link setup that doesnt have a panhard bar then you are going to have problems with the steering while the axle moves through its travel. Take a pic of your setup so we can see what is going on.

09-07-2011, 04:43 PM	#7
Rook82 RCC Addict Join Date: Jul 2009 Location: Dover, NH Posts: 1,153	I just noticed something in your initial post. It says you have a Hand Bro's steering kit but front and rear 4 link. If you are using the Hand Bro kit, it is a 3 link. If you dropped that and made it two upper links, then things will not work right. The axle needs to shift side to side with the track bar. Using a 4 link upper keeps the axle centered. I would think you are having some binding in links, etc because of this. Pictures would definitely help. And the hitec 645 is not a very strong servo. Chassi mounted servos work harder then axle mounted ones, some of the servo power gets wasted in chassi shifting, etc. And if things are not setup just right, then it may not be up to working or moving the wheels correctly. I would just try and get a pic on here so it can be looked at and diagnosed.

09-07-2011, 08:26 PM	#9
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	well my freind has the same 4 link setup as mine as his is perfect just mine has a longer shock

09-07-2011, 08:27 PM	#10
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	lol big pics 56k run away! this is how it looks after i cleaned it lol

09-07-2011, 08:34 PM	#11
Anti Hero Pebble Pounder Join Date: Dec 2010 Location: Bay Area Posts: 172	Not sure about the steering but a little wd40 would do you some good lol

09-07-2011, 08:44 PM	#13
Anti Hero Pebble Pounder Join Date: Dec 2010 Location: Bay Area Posts: 172	One thing i did notice is that you have your beadlock rings on the wrong side.

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09-07-2011, 08:55 PM	#14
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	i wanted the smaller ring outside.....lol and the wd-40 gets washed off everytime lol

09-07-2011, 09:39 PM	#16
350oshin Rock Stacker Join Date: Aug 2008 Location: granada hills Posts: 84	no its not rubbing

09-07-2011, 10:45 PM	#17
scorpion_ax Rock Crawler Join Date: Aug 2010 Location: Surrey BC Posts: 497	well i run a home made chassis mount steering and have not had any issues with the amount one way or another to me it looks as tho your steering link when centered is more to one side then the other which would give you lots of thro on the opposite side and less on the shorter side you may want to either shorten your steering drag link and re center the servo horn and give that a try and might i say HOLY drive shafts those are huge

09-07-2011, 11:20 PM	#19
Big Daddy RCC Addict Join Date: Jun 2011 Location: Gilbert, AZ Posts: 1,634	I'll second that one ^^. Looks like you are losing some throw with the servo horn not being centered when the tires are centered. Looks like a well used rig.

09-07-2011, 11:46 PM	#20
iamsuperbleeder Quarry Creeper Join Date: Jul 2011 Location: Lake City, Fl Posts: 380	and maybe it's just the camera angle, but that looks like a VERY short servo horn too like, shorter than the stock one that came on my RTR

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