GRAVE DIGGER
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21
thicknesses and number of turns of wire on the armature. The
fewer number of turns of wire on the armature, the more powerful
the motor will be. Keep in mind that the more powerful the motor,
the less battery run time you will have.
One of the more signiicant advantages to your model’s transmission
is the extremely wide range of available gear ratios. It can be geared
low enough to run extremely hot, modiied motors. Modiied motors
should be geared lower (higher numerically) than stock motors
because they reach their maximum power at higher RPM’s.
A modiied motor that is geared incorrectly can actually be slower
than a correctly-geared, stock motor. Use the following formula to
calculate the overall ratio for combinations not listed on the gear chart:
If you are worried that you might be over-geared, check the
temperature of the battery pack and motor. If the battery is
extremely hot, and/or the motor is too hot to touch, your model is
probably over-geared. If you are not able to run your model for at least
four minutes before the battery dies, then change to a lower gear
ratio. This temperature test assumes that the model is close to factory
stock weight and operates freely with no excessive friction, dragging,
or binding, and the battery is fully charged and in good condition.
The model is equipped with a Titan 12T 550 motor. The gear
combination that comes stock on the model provides good overall
acceleration and top speed. If you want more top speed and less
acceleration install the included high speed gearing (more teeth). If
you want more acceleration and less top speed, use a smaller optional
(not included) pinion gear.
The included high speed gearing is
intended for high-speed running on hard surfaces, and this gearing
is not recommended for off-road or repetitive starting and stopping.
The Titan 12T is equipped with an integrated cooling fan that is
effective during medium to high-speed operation. The gearbox is
specially vented to cool the
motor. Repetitive starting and
stopping over short distances
creates excess heat and will
not allow the fan to cool the
motor properly. For this type of
driving, smaller pinion gears are
recommended to reduce load on
the motor. See the guide, right.
Adjusting Gear Mesh
Incorrect gear mesh is the most common
cause of stripped spur gears. To set the
gear mesh, cut a narrow strip of notebook
paper and run it into the gear mesh.
Loosen the motor screws and slide the
motor and pinion gear into the spur gear.
Retighten the motor screws and then
remove the strip of paper. You should be
able to run a fresh strip of paper through
the gears without binding them.
Centering Your Servo
If the trim controls on your transmitter seem off, you may need to
re-center your servo. Additionally, whenever your servo has been
removed for service or cleaning, it must be re-centered prior to
installation in the model.
1. Disconnect the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect
the electronic speed control (ESC) to channel 2. The white wire
on the servo lead is positioned towards the crystal.
3. Place fresh “AA” batteries in the transmitter and turn the transmitter
power switch on.
4. Turn the throttle and steering trim adjustments on the transmitter
to the center “0” position.
5. Elevate the rear wheels of the model. Connect a fresh 7.2V battery
pack to the speed control and turn on the ESC (see page 12). The
servo will automatically jump to its center position.
6. Turn off the power to the model followed by the transmitter. The
servo horn is now ready to be installed.
7. Be careful not to move the servo shaft when installing the servo
horn. Readjust the ESC as described in the “Adjusting the Speed
Control” section.
# Spur Gear Teeth
x 2.72 = Final Gear Ratio
# Pinion Gear Teeth
• Fast Acceleration
• Short Distances
• Small Tracks
14-Tooth Pinion*
90-Tooth Spur
• Good Acceleration
• Good Speed
• Normal Conditions
16-Tooth Pinion
90-Tooth Spur
• High Top Speed
• Long Distances
• Hard Surfaces
21-Tooth Pinion
90-Tooth Spur
*optional (sold separately)
Motor
Screws
Strip of
Paper
ADJUSTING YOUR MODEL
Spur Gear
Pinion Gear
76
83
86
90
12
-
-
19.55
20.45
13
-
-
18.04
18.88
14
-
-
16.75
17.53
15
-
15.09
15.64
16.36
16
-
14.15
14.66
15.34
17
-
13.32
13.80
14.44
18
-
12.58
13.03
13.64
19
-
11.91
12.34
12.92
20
-
11.32
11.73
12.27
21
-
10.78
11.17
11.69
22
9.42
10.29
10.66
11.16
23
9.01
9.84
10.20
10.67
24
8.64
9.43
9.77
10.23
25
8.29
9.05
9.38
9.82
26
7.97
8.71
9.02
-
27
7.68
8.38
8.69
-
28
7.40
8.08
8.38
-
29
7.15
7.81
8.09
-
30
6.91
7.55
-
-
31
6.69
7.30
-
-
32
6.48
7.07
-
-
33
6.28
-
-
-
34
6.10
-
-
-
35
5.92
-
-
-
Gearing Compatibility Chart:
The chart below shows a full range of gear
combinations. This does NOT imply that
these gear combinations should be used.
Over-gearing (bigger pinions, smaller
spurs) can overheat and damage the
motor and/or speed control.
Stock gearing, recommended for most
running, 6 or 7 cell NiMH, 2S LiPo.
Included optional gearing, for high-
speed running only.
Usable gearing range.
High speed, Usable on hard surfaces.
Not recommended.
Does not it.
