Author: Robert "Bobby" Grisso, Extension Engineer, Biological Systems Engineering; John Cundiff, Professor, Biological Systems Engineering; Bruce Stone, Safety Manager, Virginia Farm Bureau Insurance Services; and Ray Smith, Forage Specialist, Crop and Soil Environmental Sciences; Virginia Tech
Table of Contents
Baler Machinery Safety
Bale Handling on Hillsides
Handling Large Round Bales
Bale Handling Devices
This Extension publication covers the safety aspects of equipment used in large round bale packages such as: balers, front-end loaders, bale handling and transport devices. The key to safe and efficient systems for handling large round bales is an operator who knows the hazards involved and who follows safety practices that can prevent accidents. Operators must be constantly alert for situations that may cause injuries to themselves or others. Besides pain and suffering, accidents contribute to higher costs in terms of unnecessary downtime or costly machine repairs. Alertness and safety consciousness can result in more efficient and profitable baling and handling.
Large round baling creates unique safety problems for farmers and ranchers. Large round balers have many moving parts that can cause injury or death if a person becomes entangled. Never leave the tractor seat until the PTO (power take-off) has been disengaged and all moving parts have stopped. Balers and bale handling equipment should carry warning signs or labels. Read and heed all safety warnings (see Table 1 for additional safety tips).
Figure 1. Typical safety sign for front-end loaders.
When handling large round bales, assure that the size of the tractor and has been matched to the size of the baler. A small tractor for a baler may be pushed down a hill. With insufficient traction on grassy slopes, its brakes may lock, causing the wheels to slide and the tractor to go out of control.
Many fatal accidents have occurred when a by-stander has become entangled in a baler during its operation. For your protection and the protection of others, keep the original shields in place on all power shafts and other moving parts such as chains, sprockets, etc.
The following mechanisms require special attention: 1) Gathering tines and bale chamber belts - they cannot be shielded and must be avoided while the unit is in operation. 2) Baler gate - it can close on a bystander. As an operator, make sure that everyone is clear before engaging the equipment.
Figure 2. Be sure no one is near the rear gate when it is being raised or lowered.
Heat can build up due to friction created by contact of dry hay or forage material with faulty bearings and baler belts. Farmers report that this friction and overheating has caused bales to ignite. People have been burned trying to deal with a baler fire. Always carry a 10 pound (ABC) dry chemical fire extinguisher (many balers have water fire extinguishers) on the tractor.
Table 1. Round Baler Safety Tips.
Many farmers use hauling equipment designed for small square bales to handle these larger packages (sometimes with minor modifications). When done improperly, this can lead to injury or death due to overturning or crushing.Front-End Loaders
Side overturns result from the change in the tractor's center of gravity due to the additional weight of the bale.
Figure 3. The point marked "X" is the normal center of gravity with a front-end loader. As a large bale is added, the center of gravity moves to a point marked "Z". When the load is raised, the shift in center of gravity increases the chance of overturning. The point marked "O" is the center of gravity for the round bale.
The normal center of gravity with a front-end loader is at the point marked "X." When a large round bale is carried on the front-end loader close to the ground, the center of gravity moves forward, represented by point "Y." The point marked "O," or half the diameter or length of the bale, is the bale's center of gravity.
Some operators will carry the load high for improved visibility while driving. However, when the loader is raised as shown, the center of gravity moves to the point marked "Z," which is both forward and higher than the original center of gravity, "X." In the raised position, the tractor is less stable and the potential for side overturn increases.
Now visualize this tractor on a slope with two wheels on the downhill side and two wheels on uphill side. As the bale is lifted, the center of gravity gets higher and the potential for the tractor to roll down the hill increases. The same phenomena is observed with a dump truck. Have you noticed that no dump truck operator will dump the truck on a side slope?
The chance of side overturns increases when carrying a load on the front-end loader, especially on slightly rough ground. Moving the center of gravity forward causes a transfer of weight from the rear wheels to the front, making it much easier to bounce a rear tire off the ground when passing over bumps or holes. Plus, the additional weight on the front tires may exceed the axle and tire load-carrying capacity.
A loss of traction occurs when weight is transferred from the rear tires during bale handling. This can be a problem when moving bales up a slope or on wet soil. Loss of traction can result in a braking loss on all surfaces. Mounted front-end loaders (see Table 2 for additional safety tips) should be used when the load is properly counter-balanced by adding weight to the rear of the tractor. This additional weight will bring the center of gravity back to the original center.
Another dangerous situation occurs when the loader is raised too high. The bale can roll down the loader arms onto the operator. If you handle a bale with the front-end loader (use proper bale handling devices to keep the bales on the loader), keep the load as low as possible and move slowly. Loader attachments such as spears and grapple-forks minimize the risk of the bales rolling down the loader lift-arms.
Table 2. Front-End Loader Safety Tips.
Avoid lifting bales with a 3-point lift on the rear to a height where the front tractor wheels are barely in contact with the ground. This causes steering and stability problems. At least 30 percent of the front weight of the tractor should remain on the front wheels.
It is better to handle bales with rear attachments rather than with the front-end loader. Rear tires are better suited to carry the extra weight, and there is less chance of side overturns because the bale is not lifted as high.
There is some increased possibility for rear overturns. However, the bale or carrying attachment may help prevent the tractor from having a rear overturn. Some operators use both a rear-mounted handler and front-end loaders. This will reduce the stability problems, but make sure the bale loads do not exceed the tire-carrying capacity of either the front or rear tires.
Figure 4. Rear and front-end bale-handling devices.
If possible, try to operate bale handling devices on fairly level ground. When picking up a bale with a front- end loader, drive up the slope in order to spear the bale. Care must be exercised when driving across the slope to pick up a bale. The operator may need to transport bales, in the baler, to a safer location before ejection.
When using a front-end loader to load round bales on a trailer, drive the trailer across the slope and load from the uphill or downhill side. Never try to place a second-layer of bales on a trailer up or down the slope. To accomplish this the tractor must travel across the slope and will increase the potential for overturn.Transport
Since these trailers can carry 4 to 10 bales, there can be a problem with stopping the load. At 1,500 pounds per bale, load size is between 3 to 7 tons. Add the weight of the bale trailer to this and the total transport weight approaches 9 tons. The tractor must be the proper size and weight to safely stop all of the bale and trailer weight.
Use a lower gear when going downhill, since the tractor brakes alone may not be able to stop the load. When going uphill, also use a low gear, so that you will not have to hold the load with the tractor brakes while changing gears up the slope. Do not attempt to change gears during descent, begin descent in a low gear.
Install brakes on any transport trailers carrying heavy loads. Never operate a hay trailer on the highway that is not equipped with brakes. This accessory makes stopping easier and safer. Trailers can be equipped with electric, hydraulic, or surge brakes. Most models can be equipped with a breakaway device that will lock the brakes if the trailer breaks loose from the towing vehicle.
Keep people out of the area between the trailer and tractor during hitching. Hand signals should be used and understood by both the operator and those assisting (see Table 3 for safety tips). Hitch the trailer only to the drawbar; never attach to any other point on the tractor. Assure the tractor drawbar is in the lowest, most centered and stationary position. This will keep the tractor's front wheels moving straight and provide extra steering control. Use a safety locking hitch-pin and secure the trailer with chains.
Figure 5. Hitch only to the tractor drawbar. Hitching anywhere else increases the chances of tractor overturn.
Trailer tires should be properly inflated before transporting round bales on the highway. A slow-moving vehicle (SMV) emblem should be clean and visible. Any worn or faded emblems should be replaced. Remember, farm vehicles are subject to all traffic laws. If a trailer moves large round bales, the bales should be secured with a strap that has tensile strength greater than 1.5 times the load it is holding. If the transport has large round bales stacked side by side, you probably have a wide load. These loads are illegal on the interstate highways. On other roads, wide loads have to follow all traffic laws. Check with state and local police for additional requirements.
Figure 6. The trailer equipped with SMV, reflectors and warning lights.
Do not allow bales to rest against the trailer tires. At transport speeds, the friction of the hay against the rotating tire can generate enough heat to ignite the hay. Remember that trailers pulled by a pickup have faster transport speeds than tractors and heat sufficient to cause a fire can occur in a short distance (1/2 mile). Trailer fires are difficult to control and can lead to loss of hay, trailer and tractor (or pickup).
While driving on the highway with any vehicle, assure that the driver can see and be seen. Use flashing lights and have an SMV emblem properly mounted. Allow time to pull into and across traffic. Avoid sudden, erratic, or unexpected maneuvers. Keep to the right, pull over at a safe place to let traffic pass. Never wave vehicles to pass; let drivers pass at their own discretion. Signal all turns well in advance and make sure no one is passing when turning left. Pull completely off the road if something goes wrong.
Table 3. Tractor Operations Safety Tips.
Large round baling is a good method of harvesting, storing and moving hay crops but keep safety in mind. Safety, in the final analysis, is largely a matter of common sense and patience. Most manufacturers have designed and built equipment with your safety in mind. The ultimate responsibility for its safe and proper operation lies with the operator.Acknowledgments:
Publication #: 442-455
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