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06-27-2007, 08:27 AM
| #1 |
| Newbie Join Date: May 2007 Location: Central MA
Posts: 8
|  Need gear help Well I recently built a Goliath Rock Crawler kit, my first RC build, and it went pretty well. Only thing I was leary of was whether or not I set the drive gear lash correctly. I used a piece of paper like the directions said and it seemed to turn the main spur gear w/o ripping. Of course when I started running the truck I quickly realized I had messed up and now my 84 tooth spur gear is useless, pretty much stripped out. My question is, where can I get a replacement spur gear, will any 84 tooth gear be compatible or do I need to contact PTI? Secondly and advice on how to properly set the gear to avoid future mishaps would be great. Thanks for the help, and I did try to search but did not find this particular answer. |
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06-27-2007, 09:30 AM
| #2 |
| Quarry Creeper Join Date: May 2006 Location: Pirkkala, Finland
Posts: 383
| The PTI gear have 48 pitch (P) as far as I know, so there should be choices available almost at any hobbyshop selling rc-stuff. I use the same way to adjust the lash, but I use 2 paper pieces. Has worked fine. You can hear the gears when they are too tight. And the car often doesn't move as well when the gears are too tight. |
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06-28-2007, 04:52 PM
| #3 |
| NIDRCRC.com  Join Date: Jul 2005 Location: Rathdrum, ID USA
Posts: 564
| If you get a new spur, go bigger! With a little work on the skid plate you can fit a 87T or a 90T in there. Maybe even a 93T? I had a 87x12 in mine. |
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06-29-2007, 07:10 AM
| #4 |
| Newbie Join Date: May 2007 Location: Central MA
Posts: 8
| Thanks for the help, I am going to take a look at this today. I think I will try to get it running with the stock size, then upgrade at some point. It does seem like the truck is a bit fast for crawling, so I suppose a bigger gear to lower the reduction would be good. Thanks again, I appreciate the responses. |
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06-29-2007, 01:30 PM
| #5 |
| Quarry Creeper Join Date: Apr 2007 Location: Kapahulu Safeway
Posts: 287
| To really crawl, you're going to have to use some type of gear reduction unit. The RC4WD or GD unit. |
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07-02-2007, 07:12 AM
| #6 |
| Newbie Join Date: May 2007 Location: Central MA
Posts: 8
| I did go ahead and grab an 87 tooth spur gear as well as the 84, they were pretty cheap and I'd like to see the difference. I keep hearing about the gd unit, but when I search I don't find anything specific. What exactly is this? Does it replace something or is it an added piece? |
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07-02-2007, 07:19 AM
| #7 |
| Quarry Creeper Join Date: May 2006 Location: Pirkkala, Finland
Posts: 383
| GD600 is a Gear Reduction Unit... Check the following thread what is a GD600 |
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07-04-2007, 07:41 AM
| #8 |
| Newbie Join Date: May 2007 Location: Central MA
Posts: 8
| Thanks for the link, seems like it would be pretty straight forward to install one. I think I'll work on setting the truck up properly with the new spur gear, then start looking into mods, but that will probably be the first as I know this truck is way too fast. |
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