™
ASSEMBLY AND MAINTENANCE GUIDE
HELPFUL HINTS
✔ Avoid working over a deep pile carpet. If you drop a small part or screw,
it may be diffi cult to fi nd.
✔ Place a mat or towel over your work area. This will prevent parts from rolling off and will protect the work surface.
✔ Avoid running the car in cold weather. The plastic and metal parts can become brittle at low temperatures. In addition, grease and
oil become thick, causing premature wear and poor performance.
MAINTENANCE
BEFORE EACH RUN
✔ IMPORTANT: Check to make sure that all
screws are tight. Check that the servo
saver screw is fully tightened to ensure
that your Dromida SC4.18 tracks straight.
✔ Always check the condition of your
radio system batteries and replace if
necessary.
✔ Check to make sure that all of the
moving parts of the Dromida SC4.18
move freely and do not bind.
✔ Turn on the radio and make sure the
servo moves easily and in the proper
direction.
✔ Check for any broken or damaged
parts. Replace them before running the
Dromida SC4.18. Running the Dromida
SC4.18 with broken or damaged parts
could damage additional parts.
✔ Check to make sure that all wires are
properly connected.
AFTER EACH RUN
✔ Clean any debris from the chassis and
moving parts.
✔ Check for any broken or damaged parts.
Replace them before the next run.
✔ Disconnect and remove the battery
from the chassis.
AFTER EVERY 10 RUNS
✔ Check to make sure that the bearings
are free of dirt and debris, and roll
smoothly.
✔ Check the shocks for oil leakage.
✔ Check the tires to make sure they are
still properly glued to the rims.
HARDWARE CHART
A
B
C
E
F
G
6x10MM BALL BEARING
8x12MM BALL BEARING
2x4MM ROUND HEAD SCREW
2x8MM ROUND HEAD SCREW
2x10MM ROUND HEAD SCREW
2x8MM FLAT HEAD SCREW
ACTUAL SIZE
H
J
K
L
M
N
(
WHEN PRINTED AT 100%
)
2x10MM FLAT HEAD SCREW
2x14MM FLAT HEAD SCREW
2.5x8MM FLAT HEAD SCREW
2.5x8MM SOCKET HEAD SCREW
2.5x14MM SOCKET HEAD CAP SCREW
3x6MM SOCKET HEAD SCREW
P
Q
R
S
T
U
V
X
2x8MM ROUND HEAD
SHOULDER SCREW
3x3MM SET SCREW
3MM LOCK NUT
2.6x5MM WASHER
3x6MM WASHER
1.5x6MM E-CLIP
BODY CLIP (SMALL
)
2x6MM SELF-TAPPING
ROUND HEAD SCREW
1. DIFFERENTIAL ASSEMBLY
B
31
33
GREASE
2. DIFFERENTIALS TO CHASSIS
32
GREASE
GREASE
34
32
GREASE
33
30
NOTE DIRECTION
G
G
B
G
G
NOTE DIRECTION
2
2
1
H
H
H
H
3. STEERING ASSEMBLY
DO NOT OVERTIGHTEN
(
WILL CAUSE BINDING
P
)
40
40
44
46
4. CENTER SHAFT
18
40
DO NOT OVERTIGHTEN
(
WILL CAUSE BINDING
P
18
45
)
28
27
A
28
B
29
GREASE
A
GREASE
5. SHOCK TOWERS
8
7
E
8
E
E
40
40
3
8
8
7
E
E
E
40
40
3
NOTE DIFFERENCE
12
11
V
71
NOTE DIFFERENCE
V
G
6. MOTOR MOUNT
G
E
E
E
E
26
N
4
E
E
T
Q
T
39
N
25
24
THREADLOCK
K
THREADLOCK
K
7. FRONT SUSPENSION
11.2
MM
ACTUAL SIZE
H
43
41
42
41
DO NOT OVERTIGHTEN
35
36
L
40
40
37
38
9
17
40
H
18
C
13
11
L
B
15
B
DO NOT OVERTIGHTEN BEARINGS FULLY SEATED
8. REAR SUSPENSION
9
J
10.75MM
41
35
17
40
J
C
36
18
42
37
41
38
B
13
BEARINGS FULLY SEATED
ACTUAL SIZE
40
B
9. RADIO BOX
5
47
48
6
47
X
40
50
7.5MM
ACTUAL SIZE
X
CENTER SERVO FIRST
51
49
52
S
F
SCREW MUST BE SNUG
G
G
G
10. SHOCK ASSEMBLY
63
U
U
58
54
62
62
59
61
SHOCK OIL
SHOCK OIL
SHOCK OIL
56
60
66
69
64
68
65
SHOCK OIL
1. Completely fill the
shock body with
shock oil.
2. Slowly move the
shaft up and down
to remove bubbles.
3. Slowly tighten the shock cap
onto the shock body to allow
any remaining air to escape.
11. REAR SHOCK INSTALLATION
53
S
M
12. FRONT SHOCK INSTALLATION
53
S
M
13. REAR BUMPER
DO NOT OVERTIGHTEN
E
C
23
E
E
E
E
21
E
DO NOT OVERTIGHTEN
22
C
23
14. FRONT BUMPER
19
E
E
E
20
E
E
E
15. WHEELS
73
72
70
R
70
R
TUNING GUIDE
When tuning the Dromida SC4.18 make sure that you have equal lengths from one side to the other on the shocks
and upper rods. Also, make sure to have the shock pre-load adjusters at the same setting from left to right. They
do not have to be the same front to rear.
PINIONS
The Dromida SC4.18 comes stock with the 12 tooth pinion. To obtain higher top speeds you can install a larger
pinion gear onto the motor. This will, however, decrease your acceleration and run time. TIP: Smaller pinion equals
more torque, less top speed. Larger pinion equals more top speed, less torque.
SHOCK OIL
The Dromida SC4.18 comes stock with 30 weight oil in the shocks. The handling can be tuned by changing the
shock oil to either heavier (bigger number) or lighter (smaller number). By putting heavier oil in the shocks, the
car will have less chassis roll and become more responsive. Putting lighter oil in the shocks will cause the car to
be less responsive and have more chassis roll. For smooth, high traction surfaces, a thicker oil would be best. For
low traction or bumpy surfaces, a lighter oil would be best.
CAMBER
Camber refers to the angle at which the tire and wheel ride
in relation to the ground when viewed from the front or rear.
Negative camber is when the wheels lean inward and positive
camber is when the wheels lean outward. Usually adding
a small amount of negative camber (0° to -2°) will increase
traction. However, adding too much camber will decrease
traction. The objective is to keep as much of the tire as possible
in contact with the running surface. Never put in positive
camber. Make sure that both sides are equal.
SHOCK SPRINGS
For low traction or bumpy surfaces, a softer spring should be used. For high traction or smooth surfaces, a fi rmer
spring should be used.
FRONT SHOCK ADJUSTMENT
Moving the tops of the shocks out (A) will increase steering
reaction but decrease front traction. Moving the tops of the
shocks in (B) will result in slower steering reaction but will be
smoother over bumps and have more front traction.
REAR SHOCK ADJUSTMENT
Moving the tops of the shocks out (A) will increase steering
reaction and decrease rear traction. Moving the tops of the
shocks in (B) will result in slower steering reaction but will be
smoother over bumps and have more rear traction.
2˚ NEGATIVE CAMBER
ADJUST LENGTH TO
CHANGE THE CAMBER
AA
BB
A
We try very hard to have accurate and up-to-date information in this document. Any errors are unintentional.
DIDC0041 v1.0 © 2013 DROMIDA, A HOBBICO COMPANY
dromida.com
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