RCCrawler Forums

dolphenwulf · 07-29-2011, 04:54 PM

When running my rig for about 5 minutes, it starts to loose power in forward motion only. The motor gets hot and the rear universal joint gets hot. I thought the problem was in the rear axle so I took it apart, but it shows no signs of wear at all and everything spins freely. Now Im thinking the problem is the motor, but this does not explain why it only has problems in forward only. When this happens I'll climb the same obsticle in reverse with no poblems. I've also exchanged the red to black connections to the motor to reverse the drive of the motor, and the same thing happens. Lack of power in forward. The motor gets real chirpy then stops all together, after letting it sit for a minute it will run again. Before buying a new motor ( currently running a 55 turn closed end bell ) I'd like to know what yall think. Also I stiffened the rear suspension and Im thinking the angle of the rear drive shaft is causing a bind at the u-joint, causing an overheated motor, but this also doesnt explain the full power in reverse. Im using a traxxas xl-5 esc. any help in greatly appriciated.

Trubble · 07-29-2011, 08:59 PM

Hrmph, that is a stumper.

I was wondering if your motor and rear drivetrain were getting hot because all your power was going out the back end. Maybe something broken in the front drivetrain, and now the rear's doing all the pushing? When you climb obstacles in reverse, do you still have 4 wheel drive?

ThunderVP · 07-29-2011, 10:18 PM

Drive shaft angles could still be your problem. When changing direction, the axle will wrap or torque more one way. This changes the angle slightly, and could be binding more going forward. Try running with the rear driveshaft removed and see if you loose forward motor power. If not, you will need to fix the driveshaft angles so they are less extream.

Pics of your current setup could also help.

dolphenwulf · 07-30-2011, 08:13 AM

It was the driveshaft angle. Thanks.

Robbob · 07-30-2011, 09:08 AM

a little more then just the motor and esc might help ......... what truck?

if its ring and pinion the you could have a blown bearing or the ring gear isnt shimmed correctly in that axle.

id start by tearing the axle apart and make sure its smooth and clean in there.

Run the truck should mud/water much?

07-29-2011, 04:54 PM	#1
dolphenwulf Pebble Pounder Join Date: May 2011 Location: charleston Posts: 164	Help, can't figure this out..... When running my rig for about 5 minutes, it starts to loose power in forward motion only. The motor gets hot and the rear universal joint gets hot. I thought the problem was in the rear axle so I took it apart, but it shows no signs of wear at all and everything spins freely. Now Im thinking the problem is the motor, but this does not explain why it only has problems in forward only. When this happens I'll climb the same obsticle in reverse with no poblems. I've also exchanged the red to black connections to the motor to reverse the drive of the motor, and the same thing happens. Lack of power in forward. The motor gets real chirpy then stops all together, after letting it sit for a minute it will run again. Before buying a new motor ( currently running a 55 turn closed end bell ) I'd like to know what yall think. Also I stiffened the rear suspension and Im thinking the angle of the rear drive shaft is causing a bind at the u-joint, causing an overheated motor, but this also doesnt explain the full power in reverse. Im using a traxxas xl-5 esc. any help in greatly appriciated.

07-29-2011, 08:59 PM	#2
Trubble Proverbial threadkiller Join Date: Feb 2011 Location: Central Wisconsin Posts: 1,453	Hrmph, that is a stumper. I was wondering if your motor and rear drivetrain were getting hot because all your power was going out the back end. Maybe something broken in the front drivetrain, and now the rear's doing all the pushing? When you climb obstacles in reverse, do you still have 4 wheel drive?

07-29-2011, 10:18 PM	#3
ThunderVP Quarry Creeper Join Date: May 2004 Location: SW of Chicago Posts: 212	Drive shaft angles could still be your problem. When changing direction, the axle will wrap or torque more one way. This changes the angle slightly, and could be binding more going forward. Try running with the rear driveshaft removed and see if you loose forward motor power. If not, you will need to fix the driveshaft angles so they are less extream. Pics of your current setup could also help.

07-30-2011, 08:13 AM	#4
dolphenwulf Pebble Pounder Join Date: May 2011 Location: charleston Posts: 164	It was the driveshaft angle. Thanks.

07-30-2011, 09:08 AM	#5
Robbob Custom Carbon Fiber Join Date: Oct 2007 Location: Connecticut :( Posts: 4,501	a little more then just the motor and esc might help ......... what truck? if its ring and pinion the you could have a blown bearing or the ring gear isnt shimmed correctly in that axle. id start by tearing the axle apart and make sure its smooth and clean in there. Run the truck should mud/water much?

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