This notice is for using the Castle 0808 brushless motors in the Arrma Granite GROM, Typhon GROM, and Mojave GROM.
Please read fully before using 0808 series motors in these vehicles. The 0808-4100kv and 0808-5300kv can be used on 2s only in these vehicles. The 0808-8200kv is not rated for these vehicles. Use of 3s or the 8200kv in these vehicles will void your warranty.
Shaft failures: We have received an abnormally high number of shaft failures on the 0808 motors in the Arrma GROM vehicles. After investigation, the root cause is due to improper gear mesh.
The stock motor mount is only designed to work a specific size pinion. Granite - 16T; Typhon - 18T; Mojave - 19T. If you use a pinion tooth count other than stock, the gear gear mesh will be incorrect. This can lead to excessive side load on the motor shaft cause the shaft sheering off. Use a 2mm bore, Mod .5 pinion with the 0808 motors in the GROMs.
If you use a pinion tooth count other than stock, you must use the optional motor mount package (ARA320744) Or you can use an aftermarket aluminum motor mount with a slide adjustment; but proper gear mesh (lash) must be set or the shaft will break.
Shaft failures due to excessive sideload (tight gear mesh) are not a manufacturing defect and as such not covered by the warranty.
