rc4wd excavator query

[justin]

hi all im justin from australia i hav recentley bought a rc4wd excavator when i got it it never had a battery for the transmitter so i brought one, when i put it in it was the wrong way and burnt out. so i brought a new transmitter and trying to set it up now my problem is that when i lift the boom up the right hand track goes forword aswell how can i fix that as ive never had this type of rc before.

can u suggest or recommend anything that can help with this problem

thanks justin