morse147

hey,
first time poster here with a question.
i have a losi xxx-t that has been sitting for a couple months and decieded to take it out and drive it.

the esc is stock
and the motor is a peak racing sv2

when i mount the motor up to the spur gear the motor just makes a noise when i giveit some throttle.
when i take it off the spur gear it runs fine when i give it some throttle.

also, i thought it could be the transmission but when i spin the spur gear everything rotates fine.

i have no clue what could be the problem.
any help would be appriciated.
thanks

SavageX78

Im guessing your putting the motor to tight against the spur. Try putting a peice of paper inbetween the pinion and spur. Then tighten the motor. If your pinion and spur dont have a little play it will work the motor harder.

Edit: And welcome to RCU!!

SavageX78

Also make sure the rear wheels spin freely when the motor is out. Maybe theres something binding in the drivetrain.

morse147

i tried the paper idea and i still didnt work.
i left enough play in that i could see the gap between them.

and my wheels do spin freely.

SavageX78

Have you tried a different batt? It sounds like maybe the battery your useing could be the problem.

Also how do the brushes on the motor look? Maybe they need to be replaced.

TIGER76

I know this is gonna sound stupid but is the pinion screw tight on the motor shaft?
my friend had the same problem that the screw wasnt biting down and span freely not moving the spur gear.
If span fine while not connected to the car.
worth checking as the pinion needs to be tight on the shaft

morse147

the battery is fine. i just put a different one in and it did the same thing.

morse147

the pinion gear was tight.
im going to go sauter up my stock motor and see if it stops or not

SavageX78

It sounds like your brushes are worn out or 1 is hung up on the hood and thats causeing the problem. I dont think the ESC would cause the problem. Let us know how the other motor does.

SlashBasher

My Feedback: (8)

i have an ext with an lrp 12t.It has been very slugish lately, sometimes i even have to get it goin whats wrong?

SavageX78

Check you brushes and comm. The brushes may need to be replaced. Or maybe 1 is just hung up.
My p2k2 pro does the same thing when I have a hung brush. It just gets stuck for some reason.

SlashBasher

My Feedback: (8)

how do i check that?

morse147

the other motor does the same thing.
so its not the motor.
not the battery.
and it isnt the esc either.(i put the stock one back in too)

so it HAS to be the drive train. it doesnt make sense to me though.
ill spin the spur gear with my hand and everything rotates fine

SavageX78

Hmm. Thats weird. Do the rear tires spin freely?

SlashBasher

My Feedback: (8)

how do i know when to change the brushs or if one is hung up or not. Could it just be dirty?

SavageX78

Wait that weird noise you hearis it like a squeal?? Maybe the slipper is loose. Thats probably the problem.

SavageX78

Its a hot motor, How many runs have you put on it so far?

As for the brushes you need to remove the spring and slide the brush out of the hood. Inspect the brush for chips or scratches and make sure its still kinda shiny on the surface that hits the comm. Also make sure the comm is clean.

Edit: Heres a useful link http://www.misbehavin-rc.com/pit-lan...intenance1.asp

morse147

yes

SavageX78

Ok I posted my brainstorm above. Im thinking your slipper is loose so the spur is spinning but not spinning the tires when the motors on. just tighten it a few turns.

morse147

it is like a squeal. how do i tighten the slipper?

morse147

the spur gear isnt moving though when its makin the squeal

SavageX78

Theres a nut at the end of the post on the spur. Fid a wrench or socket that fits it and tighten it a few turns. Dont tighten it all the way.

SavageX78

Hmm wow I thought for sure that was it.

It does sound more like a motor problem now. But could they both be bad. thats screwy. Are the batts freshly charged?

morse147

the batts are freshly charged.
and i dont think it could be a motor problem anymore because both motors were working fine about 2 months ago(when was the last time i drove it)

SavageX78

Well Its weird that neither will work. Did you say you tried a different esc?