Grillo Dumper 406 [12/44] Precautions when driving

6) OPERATING TEMPERATURE

The ideal operating temperature for the rubber crawler track is between -25° and 55° C, because of the

fundamental properties of the rubber.

THE WORN PARTS ARE

SHOWN BY DOTTED LINES

Worn drive sprocket

Fig. 11

2) PRECAUTIONS WHEN DRIVING

1) Avoid jerky operations when the crawler truck is in motion.

2) Keep the rubber crawler track away from sharp edges of concrete etc.

3) Cracks on the outside surface of the rubber track (in contact with the ground) are very often due to

contact with gravel, sharp stones and sharp materials such as sheet metal, nails and glass.

3) AVOID SUDDEN CHANGES IN DIRECTION

Sharp turns on concrete surfaces or excessive accelerations which generate high friction coefcients

must be avoided since they might cause cuts in the rubber.

4) AVOID CONTAMINATION WITH OIL

Fuels and hydraulic uids must never come into contact with the rubber crawler track. If this should

occur, clean immediately.

5) REPLACING THE SPROCKET

If abrasions and wear are noted on the sprocket, it must be replaced as soon as possible since in these

conditions it might cause abrasion or reveal the metal core.

ADJUSTMENTS

The steering levers are adjusted using the 2 lock-nuts as shown in Fig. 12.

The steering clutch consists of a perforated disc which is engaged by a lever; when the lever is not in

the hole there must be 0,3 mm clearance on the rod secured by the lock-nut (Fig. 13).

STEERING BRAKES AND LEVERS

Please note this adjustment must be carried out by a certied Grillo Service Centre.

Lift the machine from the ground and tighten the 2 self-locking nuts completely (please refer to Fig.12,

black arrows on the right hand-side of the picture). Now, start the engine, put the gearbox on the rst

gear and engage the feed lever: the rubber tacks do not turn, slowly unscrew the two self-locking nuts

(refer to Fig. 12). As soon as the tracks start moving unscrew the nuts for one more revolution.

Caution: never touch the tracks whilst carrying out adjustments.

The brake rods must have a 1 mm clearance (refer to Fig. 14): push on the lever controlling the brake-

shoes until contact is made, then adjust the nut.

SECURITY BRAKE AUTOMATICALLY OPERATED

Please note this adjustment must be carried out by a certied Grillo Service Centre.

To adjust the brake act on the register Fig. 16 point B.

The machine must hold rmly even at full load and on a gradient.

Dumper 406/ Translation of the original instructions