
Thank you for purchasing the Losi
®
ball dierential. We
are condent that this ball dierential will enhance the
performance of your Losi vehicle over the standard gear
dierential. The ball dierential comes prebuilt and ready to
drop into your vehicle. Read the instructions below in order
to understand installation, break-in, and maintenance.
Installation
1. Remove transmission from vehicle. Refer to the vehicle
manual for the correct procedure.
2. Remove old gear dierential from transmission along
with aluminum spacers that house the gear di bearings.
The aluminum bearing spacers will not be used with the
ball dierential.
3. Insert new ball di along with the included 10x15mm
bearings into the transmission case ensuring that the
di adjustment screw is located on the left side of the
transmission case. By doing so, this will ensure easy di
screw access for later adjustments.
Dierential Break-in and Adjustment
Once the new ball dierential is installed it will need to be
broken in. To do so, turn on the radio and the vehicle. While
holding the chassis with only the left side rear tire rmly on
the ground, give the vehicle about one quarter throttle, for
15 seconds. The right side rear tire should spin freely during
this time. Repeat this now with the right side rear tire held
rmly to the ground, allowing the left rear tire to spin. Feel
the dierential action and tighten slightly, if necessary. The
dierential should have a tight, thick feel when rotating it
after nal adjustment. To check the tightness, hold the spur
gear and right rear tire, then try rotating the left rear tire
forward. It should be very dicult to turn the left rear tire. If
the tire turns easily, the di is too loose. To tighten the di,
line up the slot in the di screw with the groove in the left
outdrive. Place the tip of a 1/16-inch Allen wrench through
both of the slots. This will lock the di screw and outdrive
together. While holding the Allen wrench in place, turn the
right rear tire forward about 1/8 of a turn.
Slipper
Adjust the slipper once the dierential is properly tightened.
Please remember your slipper will need slip before the
dierential. The dierential should NOT slip as that is what
the slipper is for. If the dierential does slip it will severely
deteriorate the life of the di balls, rings, and thrust
assembly. A slipping dierential will have a growling/barking
sound during use. To test your slipper, with the vehicle on the
ground do a full punch o (applying full throttle quickly). The
slipper should slip for 1 to 2 feet when working properly. If
not adjust slipper accordingly.
Dierential Rebuild Tips
After time the ball dierential will become gritty or notchy
feeling. This means it is time for a rebuild. During rebuilds
use only Losi made parts that are listed in the parts list.
To fully rebuild your di take the entire di apart and lay
out the parts on a clean paper towel. It is recommended
to replace the T-nut (LOSB3599), di balls (LOSA3002),
and thrust assembly (LOSB3598) for each di rebuild. The
dierential rings (LOSA3070) can be ipped over one time to
get an additional rebuild out of them. Higher quality carbide
dierential balls (LOSA6951) can be used for this dierential
resulting in multiple dierential rebuilds out of a single set.
For the di balls use Losi Silicone Di Lube (LOSA3065) and
Losi Hi-Pressure Black Grease (LOSA99203) on the thrust
assembly. To ensure all metal parts are free of dirt and debris
always use Losi Nitrotec™ Motor spray (LOSA99217).
Replacement Parts List
Part Number Descriptionl
LOSA3009 Dierential Balls 3/32" (12)
LOSA3065 Losi Di Lube
LOSA3070 Di Rings (2)
LOSA6907 5 x 8mm Bearings (2)
LOSA6943 10 x 15mm Sealed Ball Bearings (2)
LOSA6951 Carbide Di Balls 3/32" (12)
LOSA99203 Hi-Pressure Black Grease, 8cc
LOSB3595 Ball Di Outdrive Set: SL, HRL, SCT
LOSB3596 Ball Di Screw, Spring & Nut: SL, HRL, SCT
LOSB3597 Ball Di Gear, 46T: SL, HRL, SCT
LOSB3598 Ball Di Thrust Assembly: SL, HRL, SCT
LOSB3599 Ba Di Nut(2): SL, HRL, SCT
For Help, Trust the Experts
Losi, a division of Horizon Hobby, wants to ensure that
you get maximum enjoyment from your Losi purchase.
In addition to the service information available in this
instruction manual, our online Support - Answer Center
is available at WWW.LOSI.COM for performance tips and
troubleshooting questions. For live product support,
US residents may call 877-504-0233 toll-free Monday
through Friday.
Losi Ball Dierential Instruction Manual
©2010 Losi, A division of Horizon Hobby, Inc.
Revised 12/09 17921.1
800-0401
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