How to Load and Unload Trucks at the Shop Without Injuries

Why this matters

Most of the injuries a service shop records do not happen on a roof or in a crawlspace. They happen at 7 a.m. in its own lot: a back tweaked swinging a water heater into a van, a foot under a liftgate edge, a tech walking behind a box truck that was backing toward the bay, a condenser that slid off a dolly on the ramp. Loading is the one heavy task every crew does every day, which is exactly why nobody plans it. This card is the shop-side routine, from parking the truck to closing the door. What rides where once it is inside (chemicals, cylinders, batteries) is covered in Loading the Van So Chemicals, Cylinders and Batteries Ride Safely.

Step 1: Park it, set the brake, chock it if it can move

Before anyone steps onto a liftgate or a ramp, the truck is in park (or in gear for a manual), the parking brake is set, and the engine is off. If the lot slopes at all, put a wheel chock against a tire on the downhill side.

Why: a truck that creeps a foot while someone is halfway up a ramp with a load is how ramps come off their hooks. Where a forklift or powered pallet jack drives into a truck or trailer, OSHA's powered industrial truck standard (1910.178(k)) requires the brakes set and wheel chocks under the rear wheels for exactly this reason; a van loaded by hand gets the same treatment on a slope as good practice.

Engine off, inside the building. Do not idle a truck in the bay to run its heater or liftgate with the overhead door closed or partly closed. Engine exhaust carries carbon monoxide, an odorless gas that builds up fast in an enclosed bay. Run the liftgate on its battery or back the truck out.

Step 2: Back the truck with a spotter, or do not back it

Box trucks and vans with no rear windows have a blind zone behind them large enough to hide a person. When a truck backs toward the bay, a spotter stands where the driver can see them in the mirror, uses agreed hand signals, and stays out of the path between the truck and the building.

The one rule that matters: if the driver loses sight of the spotter, the driver stops. A spotter who walks behind the truck to check clearance has just become the hazard.

What breaks if skipped: the commonest serious yard injury is a person pinned between a backing truck and a wall or another truck. Backup cameras help and do not replace the spotter, because a camera shows the space, not the person stepping into it.

Step 3: Clear the path before picking anything up

Walk the route from where the item sits to where it will ride: shop floor, door threshold, lot, liftgate or ramp. Move hoses, cords, pallets and loose parts out of it. Check the floor is dry; a wet bay floor and an appliance dolly is a fall waiting for a load to land on it.

Why before, not during: a person carrying or rolling a heavy load cannot look at their feet and the load at once. The path gets cleared with empty hands.

Step 4: Pick the lifting method by the label, not by who is strongest

This is the step that prevents back injuries, and it is a gate: every item goes one of three ways.

• One person, by hand: compact items, light enough to lift close to the body at waist height without twisting.
• Two people: items too heavy or too awkward for one, where two can lift together on a count with a clear plan of who goes first through a door.
• Mechanical: an appliance hand truck with a strap, a dolly, the liftgate, a ramp, or the forklift for palletized freight.

The number to anchor on. The NIOSH Revised Lifting Equation starts from a load constant of 51 pounds: the most it recommends for a lift under ideal conditions (load held close, starting at about waist height, no twisting, done occasionally, good grip). Every departure from ideal lowers the recommended weight, so a 40-pound coil of wire lifted from the floor to a high van shelf with a twist can be over the limit even though the number looks small. Use 51 pounds as the line above which a single person never lifts by hand, and use judgment well below it when the lift is low, high, far from the body or twisting.

Read the carton. Water heaters, condensers, furnaces and appliances come with the shipping weight printed on the box. A 50-gallon tank water heater commonly weighs well over 100 pounds empty, and a residential condensing unit is often in the same range or more. Read the carton, do not guess.

Step 5: Use the liftgate or ramp the way its decal says

• Liftgate. Check the capacity decal and keep the load centered on the platform, back from the outer edge, as the manufacturer instructs. Feet stay off the platform's edge and out of the gap between platform and truck bed while it moves. Do not ride the platform unless the manufacturer's instructions allow it, and then only as they describe. Raise and lower with the load stable and the strap on the hand truck tight.
• Ramp. Check the ramp's rated capacity, hook it fully to the truck bed, and set it on firm level ground. The steeper the ramp, the harder the load pulls; with an appliance hand truck, the person on the high side controls the load and a second person guides from the side, never from below.

What breaks if skipped: a load that slides off the outer edge of a moving liftgate, or a ramp that kicks out because one hook sat on the bumper instead of the bed.

Step 6: Strap it before the door closes

Every item heavy enough to hurt someone if the truck brakes hard gets secured before the door closes: ratchet straps to the truck's anchor points, or blocked against a wall or bulkhead. Tall items like water heaters get secured at more than one point so they cannot tip.

The number. The federal cargo-securement rules in 49 CFR 393, Subpart I, reach commercial motor vehicles (in substance, those over 10,000 pounds gross vehicle weight rating in interstate commerce, and many states apply them intrastate). Under 49 CFR 393.106, the combined working load limit of the tiedowns must be at least half the weight of the cargo. Many service vans fall under the federal weight line, and the one-half rule is still a sound floor for any truck: check the working load limit printed on each strap.

Why last: the load is strapped where it will ride, after everything around it is in place, and the last person checks every strap before the door is shut. An unstrapped item found after a hard stop is a damaged unit at best and a crushed tech in the cargo area at worst.

A worked example: one morning, one box truck, three items

An install crew is loading a box truck with a liftgate whose decal reads 1,300 pounds capacity. The day's job needs a 50-gallon gas water heater (carton label 140 pounds), a 3-ton condensing unit (carton label 170 pounds), and a carton of fittings and valves (38 pounds on the receiving log). The lot slopes slightly toward the street.

Steps 1 and 2. The driver backs the truck to the bay door with the installer spotting from the driver's side, visible in the mirror the whole way. Parking brake set, engine off, one chock on the street side of a rear tire.

Step 3. The installer clears a garden hose and a pallet of filters from the path between the water heater and the bay door. The floor is dry.

Step 4, the gate.

The fittings carton passes for one person only because it is lifted from the bench, close to the body, with no twist. Had it been sitting on the floor and been lifted onto the truck's high shelf, the same 38 pounds would have been a two-person or a different-shelf lift.

Step 5. Each appliance goes on the liftgate separately on the hand truck. Water heater plus a 45-pound hand truck is 185 pounds; condenser plus hand truck is 215 pounds. Both are far inside the 1,300-pound decal, so capacity is not the limit here; the platform's depth is, and loading one at a time keeps each load centered and back from the edge. Nobody rides the gate.

Step 6. The water heater gets two straps, one high and one low, to the wall rail. The condenser gets one strap and is blocked against the water heater's base with the fittings carton kept clear of both. The heaviest single item is the 170-pound condenser, so the one-half floor asks for at least 85 pounds of combined working load limit on it; the strap is marked 500 pounds. For the water heater the floor is 70 pounds, and its two straps total 1,000. The installer checks each ratchet, closes the door, pulls the chock and walks the chock back to its hook.

What would change it. A rainy morning moves the work: a wet liftgate platform and a hand truck tire are a slide, so the loading happens with the truck backed fully into the bay and the door open, engine off. A crew of one changes Step 4: with no second person, the water heater and condenser still go on the hand truck, but the strapping and any tipping happen only where one person can control the load, and anything that would need two people waits for two.

How you know it is working

Watch a load-out without saying anything. The truck is still and chocked before the first item moves. The spotter is visible to the driver the whole way in. The path is clear before anyone picks anything up. Every item over the line goes on wheels or gets two people. The door does not close until the straps are checked. If any of those five things depends on who happens to be loading that day, it is not yet a routine, and the next step is to put it on the wall by the bay door.

References

• NIOSH, Applications Manual for the Revised NIOSH Lifting Equation (the 51-pound load constant)
• OSHA 29 CFR 1910.178(k), trucks and railroad cars boarded by powered industrial trucks
• FMCSA 49 CFR 393, Subpart I, Protection Against Shifting and Falling Cargo, including 393.106
• See related: Loading the Van So Chemicals, Cylinders and Batteries Ride Safely; How to Decide Who May Drive the Forklift and Pallet Jack