J&M 250-7S, Operator'S Manual

10

Initial Operation / Maintenance

WARNING 

BE CERTAIN THAT ALL POWER IS SHUT OFF BEFORE SERVICING THE GRAVITY BOX.

Before the gravity box is put into service:

Has the track assembly (opens door) been lubricated for less wear on the sprocket and track and for easier door operation. 

Has the SMV (Slow Moving Vehicle) Emblem been positioned with a point of the triangle upward and as near to the rear and 

centered or as near to the left of center of the unit as practicable? Is it located two to ten feet above the ground measured 

from the lower edge of the emblem?

Has the gravity box been properly attached to the running gear? If no rocking bolster is used, bolt all four corners (use 1/2” 

bolts provided) of the gravity box runners to the running gear. (If the box is used in rough terrain, bolt a minimum of two 

corners and chain (or cable) the remaining corners to allow more box flexibility. 

Have all braces, bolts, nuts, lug bolts, and lug nuts been checked to ensure that they are properly fastened?

Have the safety instructions been read and clearly understood by the operator(s) of this machine. 

Do the lights work properly? Are all reflective decals clean and visible? Are they positioned correctly?

Are the tires properly inflated?

BRAKING SYSTEM REQUIREMENTS

WARNING  Tow Loads Safely

Stopping distance increases with speed and weight of towed loads, and on slopes. Towed loads with or without brakes that 

are too heavy for the tractor or are too fast can cause loss of control. Consider the total weight of the equipment and its load.

For towed equipment WITHOUT brakes, the following is recommended:

Do NOT tow equipment that does not have brakes at speeds over 20 mph (32 km/h); or that, when fully loaded, has a mass 

(weight) over 1.5t (3300 lb) and more than 1.5 times the mass (weight) of the towing unit. 

For towed equipment WITH brakes, the following is recommended:

Do NOT tow equipment that has brakes at speeds over 25 mph (40 km/h) ; or that, when fully loaded, has a mass (weight) 

more that 4.5 times the mass (weight) of the towing unit. 

Ensure the load does not exceed the recommended weight ratio. Use additional caution when towing loads under adverse 

conditions, when turning and on inclines.

WARNING

Before filling the gravity box, make certain that no one is inside the grain tank. Never allow children or anyone in, near, or on 

the gravity box during transport or during loading or unloading of grain. Be aware that moving grain is dangerous and can 

cause entrapment, resulting in severe injury or death by suffocation.

After hauling corrosive materials such as fertilizers, be sure to wash out the grain tank to prevent premature rusting. Bare 

spots on metal should be primer coated before applying the outer surface paint.

Check the box periodically for cracks in welds and for other structural damage. Have cracked welds fixed immediately. 

Failure to do so could result in extensive damage and greatly reduce the life of the gravity box.