Operating instructions

MTH F3 Diesel Engine

When the knuckle fires open you will hear the buzzing of the coil

energizing and the sound of the air lines coming apart. It can best be

described as a CHA-CHUSHHH sound. The coupler doesn’t’t have to be

fired in NEUTRAL. Once the coupler is armed it can be fired in Forward,

Neutral or Reverse. However,

you may find that the coupler

doesn’t’t open when firing the

coupler at high speeds. Reduce

the voltage setting on your

transformer if this occurs and

run your engine at a slower

speed before firing the coupler.

If the coupler continues to open

erratically, try lubricating the

knuckle with light oil as

indicated in Fig. 3.

For multiple heading purposes, only one of the two Proto-Couplers will

function at any one time. Use the coupler direction switch as shown in Fig.

1 on page 3 to select either the front or rear coupler. Simply slide the

switch toward the direction of the coupler you want to make active.

NEUTRAL-ACTIVATED CAB CHATTER SOUNDS

Your engine is equipped with four dispatacher-to-engineer “Cab Chatter”

radio transmissions that occur every 2 to 30 seconds. Each sequence will

play at random intervals to eliminate repetition. While the sounds are

selected to play randomly by the microprocessor, there is no guarantee that

you won’t hear the same message repeated twice or more times.

SQUEAKING BRAKE SOUNDS

ProtoSound equipped engines feature the ability to play the sound of

squeaking brakes whenever your engine slows in speed. There are two

settings for activating the squeaking brake sounds. The default setting

allows the brake sounds to play

while the engine is in forward or

reverse and the transformer

throttle is lowered from a high

setting to a low setting (14 volts

to 8 volts or less). The second

Lubricate

Coupler

Knuckle

Figure 3: Lubricating The ProtoCoupler Knuckle

Throttle Down From

High Voltage To Low

Listen For The

Squeaking Brake Sounds