• Welcome to RCTalk! 🚀

    Join the #1 RC community where hobbyists connect, share, and get expert advice on RC cars, trucks, boats, drones, and more!

    • ✓ Friendly & passionate RC enthusiasts
    • ✓ RC tips & troubleshooting
    • ✓ Buy, sell & trade RC gear
    • ✓ Share builds & upgrades

More Noob. problems. (Throttle linkage and reverse)

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
T

Tornsteel

RCTalk Basher
Messages
62
Reaction score
0
Points
0
Location
Boring
RC Driving Style
Having a couple problems.

#1 Problems w/ the throttle linkage. I have to turn the throttle trim all the way (counter clockwise) on the transmitter to keep the servo horn off the stop on the rod that goes to the throttle. The truck is a couple of weeks old. I think that I messed with the trim to much or some thing. What do I have to do to get it adjusted right. Tried to reset the opti drive.

#2 the truck doesn't shift into reverse. Is the gear stripped in the tranny. I have gone threw two spur gears. Just asking before I take the tranny apart to check the forward and reverse gear. By the way. The servo does shift.

Any help would b appreciated. Thanks.
 
well for the throttle linkage all you have to do is changer the position of the servo horn on ur servo. for the problem 2 i would guess its stripped but check it out open it up there not that complex inside.
 
brmax said:
well for the throttle linkage all you have to do is changer the position of the servo horn on ur servo. for the problem 2 i would guess its stripped but check it out open it up there not that complex inside.
Click to expand...

Thanks I'll give that a try.
 
give a better description of your reverse problem please i know when i blew my reverse gears twice the truck would still shift but just rev rear high like no body was home
 
Sounds like the rpms are too high because of problem #1 which in turn doesn't allow the transmission to shift into reverse #2. My 3.3 T-Maxx won't shift into reverse that often because I idle it high to overcome the extra mass that I've added to it.
 
I am having problems with the idle being high. I have tried to adjust the idle screw but it doesn't seem to help any. Don't I have to do something w/ the LSN too? Back to the symptoms. I will come to a complete stop and flip it into reverse. The linkage moves to the tranny but the transmission doesn't shift in to reverse. I haven't had the time yet to pull the trans to check the gears yet. I will try to do it some time today. I have to work until 4am but I may get out to the house to day.
 
Yeah, my linkage will move on my T-Maxx but untill the clutch engages it will not go into reverse and vice-versa. You need to richen the mixture to idle it down, not lean it. So counter-clockwise on the high speed needle first while warm. You may just need to adjust your throttle linkage or clean your carb.

It may take time, but the more things we rule out the quicker you will find the source of the problem.
 
Thanks. I'll give that a try. Sorry I haven't been able to do any of this yet. I'll start on Fri (tomorrow). I work a crazy schedule. I know that a lot of my tuning issues are from lack of experience. I am starting to get the hang of it though. The dang weather lately is killing me. Just three days ago It was in the 80's and this weekend they're calling for snow and record lows (my weekend off:doh:).
 
yeah join the club same thng happenin in the weather round here
 
Got a couple of things done today.

1. Checked the gears in the tranny.= Every thing looked great no prob. there.

2. Cleaned the carburetor.= Seemed to help a little with the way it ran.

3. Reset all of the needles to factory (like I always do) before starting it for the day. = The idle speed was about where it should be until it warmed up Then it started to idle higher. Adjusted the HSN and then the LSN and then the idle screw. Didn't slow the idle that much. Still wanted to take off after stopping. The truck ran great for about 20min and then all of the sudden started acting like it was running to rich and the temp went from 200 to 360 on the temp.? What would cause this?

4. Truck still won't shift from forward to revers or from reverse to forward. This is even when the idle was about right. The gears in the transmission are in good condition.

5. Had another problem. The truck would stop when it was about 40ft away like it lost signal or battery power (new bat's in transmitter and had a full charge on the truck bat's). I bought the truck about 3 weeks ago. Installed a fail safe after 1 week. Is it the fail safe? I wouldn't think it would be the batteries. What do you think it is?


Problems remaining.


1. Idle. I think I still need to get use to tuning the idle speed.

2. Why did the truck start to bog at acceleration and heat up all the sudden?

3.Still doesn't shift from forwards to reverse or reverse to forward. When it does, it takes a while working the switch and the throttle. Even with good idle and gears on the transmission. The servo is working. I can see it. It seems like the Opti Drive isn't working right (not sensing the truck is stopped).

4.Why is the truck acting like it is loosing signal or battery power at about 40ft away. I will regain control after 1 or 2 sec. and then it returns to normal, but will be off and on further than 40ft. Is it a bad fail safe?

I hope that I explained my self enough.

Any help will be appreciated. Thanks
 
Your answer to #3 is ... Your LSN is set too lean. Richen it and allow it time to warm up before you expect performance from it. Running rich will NOT cause it to overheat like that.
There's no reason to reset the needles before each day's run. Once they are set right, you'll only need an occasional adjustment on the HSN to compensate for outside temp and humidity.

4.... It's not shifting due to an idle that's slightly too high. Once the LSN is set right and the idle is slow enough, it will shift fine.

5. Very possible that it's the batteries in the truck. They work hard steering it. Replace them. If that's not the problem, post again.
 
Thanks Rolex. I'll richen the LSN and see how that go's. I'll also stop resetting the needles every time I run the truck and just tweak the HSN.

As for the Batteries go. That stinks, because the truck is only three weeks old. I'll check the volts on them. I even put a full charge on them before running the truck each time. I will take your advice anyway and buy a new pack next weekend (after pay day).


Thanks again.
 
Now go get it dirty lol unlike SOME PPL WE KNOW ......I WONDER WHO I'M TALKING ABOUT HAHA
 
Yeah, I wonder who that might be.

What kind of batteries are you using, since you said you can recharge them before you run.
If you have inexpensive rechargeable penlight batts in the stock 4 cell holder, you are only getting 4.8V. If you want good run time from the on board battery, get a 5 cell hump pack, 1400 mAH. That's 6V, so you'll get better servo response and much longer run time.
 
I have the stock batteries that comes with the truck. It is the RX Power Pack (5-cell flat style, GP cells, NiMH, 1100mAh). http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHFP5&P=FR
This evening I got the truck out and warmed it up. I started with the stock settings on the needles. Once it was warm I leaned out the HSN (up to a 1/4 turn). It was still running rich but left it there. The Idle was still a little high. Then I started leaning out the LSN. I got the idle slowed down. It took a lot of rich adjustments from stock but it the idle seems good. The truck still wants to take off though. I wasn't able to richen it any more. It was dark out by this time and the truck was really boggy because it was so rich. I only got the truck to shift from forwards and to reverse a couple of times but I had to let it roll a little and then hit the brake. So it still doesn't want to shift. So whats next. Thanks for the help.
 
If the truck starts and runs, leave it there, and warm it up, then put the nose of it against something solid and give it fast hits on the trigger. If it cuts out, richen the LSN 1/8, and if it 'bogs', lean it slightly. When it starts to improve, adjust it a hair at a time, giving it 15 seconds to settle in, then keep hitting the trigger and adjusting it till it really wants to take off hard.
At that point, your LSN should be good, and now you adjust the idle setting. After that, put it on the ground and run it. If it cuts quickly, after getting to about 1/2 speed, richen the HSN. If it blubbers, which is probably what it's doing, lean the HSN. That's for WOT.
Once you have the right tune, and the proper idle, your shifting will most likely take care of itself.
 
OK I'll give that a try. It might not be until Wend. though.

Do you still think it might be a battery problem with those batteries?
 
I believe they are NiCad, and not NiMH, and that's where the problem is. NiCads develop a 'memory' when they are charged regularly and not fully discharged.
You'll need to cycle them. That means you drain them completely, then charge them completely 3 times. After each discharge or recharge, let them cool down to room temperature.
Once they've been properly cycled and recharged, they'll more than likely be fine since they are pretty new.
After running, make sure to discharge them completely before putting them back on charge for the next day.
 

RC Builds

Back
Top