pzrwest

I'm useing a Revo differential in an rc halftrack. When under a heavy load, say a grade it seems to slip I guess you would call it. Is there a way to reduce the slippage? Here is a parts diagram of the differential unit. Any help on this would be greatly appreciated... Thank you in advance... Harold

Metallover

The diff shouldn't actually slip... It's designed to allow the wheels to spin a different speeds while providing all the power to the wheels. Could it be one track is loosing traction and the other track isn't? I assume you have the diff set up so that the power from the motor gets transferred to each track, acting like two wheels.

Try using a thicker differential oil.

pzrwest

Here are pics of the setup. When it starts up a grade both tracks stop turning but the motor shaft spins turning the input shaft of the differential. All shafts are pinned or bolted.

Metallover

Only thing I can think of is taking the shell off and watching the shafts as you give it throttle and hold it back. I wonder if the wheels that drive the tracks are slipping or if it's actually the differential. Is this a new diff?

RCtruckRacer

A differential of this type cannot 'slip' as a standard RC slipper will. Nor will it 'bark' as a ball diff can. Based on your description I am guessing the mesh is off a bit on the ring and pinion. Or, somehow the stress from hitting the incline is torquing the case and throwing off the mesh. Could also be a broken gear in the diff too I guess.... or a cracked case that only becomes noticeable on an incline, thereby throwing off the mesh? Try taking out the diff, leave the input and output shafts on. Now turn the input shaft while holding the output shafts and see if you can find out where the lack of resistance is.

Putting in thicker oil will help keep it from 'diffing out.' But it will only be really noticeable if one of the tracks were to be off the ground. I'm guessing that doesn't happen very often in a vehicle like that! Thicker oil will also make the turning radius wider. If it were me, I'd probably just throw a bit of lithium grease in there as it seems that you would want as much differential action as possible.

pzrwest

Well call me a block head for not rechecking things. I guess in my rush to do a test run I forgot to secure the brass tubing to the hex shaft that goes into the motor unit. After I removed the divetrain from the half track I noticed I hadn't pinned or soldered the tubing to the hex shaft. I guess the old saying check yiour work, then check it again, then check it again. Now just to do another test drive to make sure that was the problem, but I'm pretty sure that was it. I thank everyone for theie input and help

Access

Can you post a pic of the vehicle (halftrack) itself? Is it a custom build or a kit / RTR?

pzrwest

I have pics of the build on this 1/6th scale Armor Hobbies SdKfz 250 halftrack in the RC Tanks section. It is not an RC unit to start with it is a static 1/6th basic halftrack model. Here's the link to the thread on my halftrack http://www.rcuniverse.com/forum/m_8904621/tm.htm