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Ohio State University Extension
To be able to secure a vehicle or piece of equipment using the proper chock and block method.
To demonstrate the chock and block principles, have the training session in the
farm shop or in the field. Give employees the opportunity to demonstrate how they would chock/
block equipment if they were using it in the field or working on repairs in the shop.
 The purpose of the chock is to pin the wheels and hold them stationary. When unhooking farm equipment
from a tractor, make sure the tires on the implement have been chocked to prevent the operator or
bystanders from being injured if a roll back occurs. The rear most axle
should be the one that is chocked. Tires may need to be chocked in both the
front and the rear, on some equipment. Operators can be caught between a
tractor and the equipment or a piece of equipment and the shop wall because
the proper chocking procedures were not followed. It is a simple concept,
but many farm employees forget to use this procedure when working with or
around equipment. In some cases, workers have been killed or injured because
they have failed to follow this procedure.
When loading or unloading bags or pallets from a semitrailer it may be necessary to block freight
inside the trailer to prevent the movement. Blocking reduces the chance of a load shift, which can
cause a trailer to turn over and damage the cargo or injure a worker. Cargo doesn't have to be round to
move, so block all four sides of the cargo separately. Use sound blocking material. Make certain that nails
or spikes are long enough and the lumber is thick enough to prevent the cargo from shifting. Other freight
should never be used as a block.
When working on equipment don't rely on jacks or hoists to support the equipment. They are made to lift,
not to support. The equipment should be blocked to support it while you are working on it.
The principal used in both chocking and blocking is the same:  securing to prevent movement.
Tips to Remember:
- Chock wheels at the rear axle.
- Block freight inside the trailer when loading or unloading farm supplies.
- Do not unhook farm equipment that has not been chocked.
- Never put hands, fingers, etc. between equipment and blocks.
- Double-up and alternate the positioning of blocks while building the platform.
- Use larger blocks on the bottom. Make the platform as wide as possible.
- Rear axles need to be chocked.
- Do not attempt to unhook farm equipment that has not been chocked.
- Freight should be blocked when loading or unloading a trailer.
- Other freight should not be used as a block. Use proper materials for blocking.
- Keep hands and fingers from in between equipment and blocks.
True or False
| 1. There is no need to chock farm equipment before it is
unhooked from the tractor. |
T |
F |
| 2. The purpose of the chock is to pin the wheels and hold them
stationary. |
T |
F |
| 3. It is a good safety measure to block cargo inside trailers
when loading or unloading. |
T |
F |
| 4. When chocking a loaded hay wagon, chock the rear axle. |
T |
F |
| 5. Cargo should be blocked separately. |
T |
F |
Answer Key
1. F, 2. T, 3. T, 4. T, 5. T
Disclaimer and Reproduction Information: Information in
NASD does not represent NIOSH policy. Information included
in NASD appears by permission of the author and/or copyright
holder. More
NASD Review: 03/2004
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