TM 5-3825-225-14&P
Section III. OPERATION UNDER USUAL CONDITIONS
2-5. COUPLING SEMITRAILER TO TRACTOR.
a. Perform the preventive maintenance checks and services in Table 2-1.
WARNING
All personnel must stand clear of semitrailer and tractor during coupling operations.
Failure to follow this warning may result in serious injury or death to personnel.
b. Back tractor up to semitrailer until tractor is close enough to semitrailer to connect air lines.
c. Stop tractor. Activate tractor parking brake and semitrailer brake.
d. Connect service air line from tractor to service gladhand on semitrailer. Connect emergency air line to
emergency gladhand on semitrailer.
e. Connect tractor's electrical cable to semitrailer's receptacle connector.
f. Open service and emergency air control valves.
g. Wait until the air pressure has built up enough to activate the semitrailer brakes, then slowly back the tractor
under the semitrailer until the kingpin is engaged by the fifth wheel jaws.
NOTE
Steps h and i must be performed to ensure that kingpin is securely locked by fifth wheel
Jaws. Never raise landing gear until the locking of the Jaws around the kingpin is certain.
h. Disengage tractor parking brake.
(1) Place transmission in first gear and check engagement by trying to pull forward a few feet.
(2) The semitrailer brakes should prevent forward movement and the kingpin should remain engaged to
the fifth wheel.
i. When the operator is certain that the kingpin is engaged, thetransmission should be returned to neutral and
the parking brake applied.
j. Raise the landing gear, release the parking brake and drive off.
2-6. START-UP AND FILLING INSTRUCTIONS.
NOTE
The water distributor Is equipped with two 15 ft. (4.6 m) sections of suction hose for filling the
tank from ponds or streams. The tank can also be filled through the manhole from water
stations. The following instructions cover filling from a pond or stream.
a. Move the water distributor within reach of the water supply.
b. String suction hose (see Figure 2-3) from the water supply to the water distributor pump. Ensure that the hose
coupling gaskets are in place and that the foot valve is submerged in the water supply.
c. Remove the 4 in. (10.2 cm) dust cap (C) and connect the suction hose to the pump.
d. Close the sprinkler valves (F and G).
e. Close the discharge valve (A).
f. Open the inlet valve (B, Figure 2-4).
g. Fill the water distributor pump tank with water to prime it (see Figure 2-5).
NOTE
The engine can be started and controlled from the auxiliary control box or the Instrument panel.
h. Start the engine.
(1) Push the tattletale switch (8, Figure 2-1).
NOTE
Before starting the engine, the auxiliary control box throttle control must be turned to the OFF
position and the instrument panel throttle control must be pushed all the way in until it stops.
(2) Adjust the throttle controls (3, Figure 2-1 and 13, Figure 2-2).
(3) Turn on the ignition switch (7, Figure 2-1). The ignition light (2) should turn on.
2-7
