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g) Checking alignment and tooth backlash of drive
The engine transmits its power via the pinion on the clutch bell to the main pinion at the centre differential. Both rotary axes, i.e. the crank shaft, engine side, and
the axis of the drive section to the front and rear axle must be exactly parallel to each other. This prevents twisting in the drive section, premature wear of the
pinions and bearings and loss of power.
The parallel alignment of crankshaft and drive section has to be checked every time before using the vehicle and, if necessary, has to be readjusted!
When the alignment is parallel, the pinion on the clutch bell and the main pinion will run smoothly. If there is too much play, the pinions will be destroyed over
time. Too little play will destroy the bearings in the clutch and the engine.
Checking the tooth backlash
• Put a thin paper slip between the pinion on the clutch bell and the main pinion in
the drive section.
• Turn the pinions manually.
• The paper strip must not tear when the pinions turn!
Readjusting the tooth backlash
• Loosen four motor attachment screws of the engine on the underside of the chassis.
• Align the engine sideways and fasten the screws again tightly.
• Unscrew four screws at the top of the engine support and align the motor vertically.
h) Operating the RC system
Please note the individual operating instructions of your remote control!
The operation of the transmitter is possible with rechargeable batteries or normal batteries. When you use rechargeable batteries, make sure they are high-
capacity batteries to ensure long battery life. If you use normal batteries in the remote control, we recommend the use of high-quality alkaline batteries. Use a
battery tester to check if the batteries still have enough power.
If the batteries are empty, always replace the complete set (never just individual cells!). Always use batteries or rechargeable batteries of the same type and
manufacturer. Never mix normal batteries and rechargeable batteries.
The operation of the receiver is possible with rechargeable batteries or normal batteries. Note however, that rechargeable AA batteries have less voltage (4 x
batteries 1.5V each = 6V; 4 x rechargeable batteries 1.2 V each = 4.8 V). Less voltage and lower capacity of the rechargeable batteries reduce the operating time
and can lead to malfunctions of the RC system.
Our tip:
We recommend using a 6V Hump rechargeable battery pack for the receiver.
• Insert the 8 AA batteries (rechargeable batteries) into the battery compartment of the receiver and observe the polarity!
• Open the RC box on the chassis and remove the battery holder.
• Insert 4 AA batteries or rechargeable batteries into the holder. Observe the polarity and make sure the batteries are inserted tightly.
• Insert the battery holder (or the Hump battery pack) including the cables and the plug into the RC box again.
• Carefully connect the two plugs.
• Carefully remove the receiver from the RC box and unroll the aerial wire.
• Install the aerial wire to the outside through the opening in the cover of the RC box.
• Thread the aerial of the receiver through the aerial guide tube.
• Stick the lower end of the aerial guide tube into the recess on the cover of the RC box.
• Secure the aerial tube in the aerial support.
• Secure the aerial wire at the top of the guide tube using the tube rubber cap.
Never shorten the aerial wire!
• Switch on the transmitter. The control LED of the transmitter should light up brightly.
If it does not light up, check the batteries and, if necessary, replace them.
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