Can I raise the body a little first and pop the tailgate pins once the load starts to shift? On the Load King 16/18 ft dump body, the operator manual answers that one plainly: release the tailgate pins before raising a loaded body, and never release them with load against the tailgate. That turns the whole question into an order-of-operations decision made at the controls, not a glance over your shoulder after the hoist is already moving.
The pins hold the tailgate shut, which is why they carry whatever push the load puts into the gate. Everything here is scoped to the Load King 16/18 ft body and the controls it ships with; a different custom dump truck can pin, latch and sequence its gate differently, and its own manual governs.
What the Tailgate-Release Check Must Prove
The manual's tailgate rule has two halves, and they read like a single sentence. The first half is about order: pins out, then raise. The second half is about a condition that can make the first half unsafe to attempt, and no amount of care at the controls clears it. Treat one half as a substitute for the other and you end up trying to solve a condition problem with an order answer.
A third rule covers the other end of the job: do not move the truck with the bed upright or without the tailgate latched, because a raised bed changes your overhead clearance and an unlatched gate lets the load shift. The operator is therefore managing two states, not one — pins released for dumping, tailgate latched for travel — and a check that proves only one of them leaves the other unproven.
The Manual's Order for a Loaded Raise
The covered body's manual sets its setup in sequence: position the chassis on level ground, away from hazards such as power lines and traffic; start the chassis engine; set the parking brake; engage the PTO switch on the center dash panel. Keeping bystanders well away from the operating area comes before the body moves at all, and the pins come out before the loaded body rises.
Suppose a truck is spotted on a pad that looks flat but drains to the rear, with the gate downhill. That is the reason ground position comes first in the sequence rather than somewhere in the middle: the level-ground step is what makes the later steps mean what the manual says they mean. What the manual does not hand you is a universal pre-dump checklist. It gives the relationships that matter for this body — ground and clearance, then the power path, then the people-free zone, then the pin state, then the raise — and each step assumes the one before it is already true.
Why Pins Go Out Before the Body Goes Up
A dump body is a tilting floor with a gate at the back, and gravity does the work once the hoist starts. At flat, the load's weight runs mostly straight down into the floor. As the body tips, part of that weight points along the floor toward the rear and the gate takes the push. The pins are the retaining element in that gate, which is why the raise works against a gate that is still tied to the body while they are in.
The reason the manual puts release before raise is that pin state has to be settled while the geometry is still flat and the load is still resting on the floor. Once the body angle changes, the push on the gate has already built. The tailgate doesn't care how careful you are; it only knows which way the load is pushing. The whole thing comes down to the order of two acts: settle the pin state, then change the geometry.
The Load-Against-Tailgate Stop
When material is packed hard against the gate, the condition half of the rule is the one that applies, and it works as a stop rather than a technique. A pinned gate with load bearing on it is holding stored push. Pull the pins under that condition and the gate stops being a retained door and becomes a pressure-loaded one that opens on its own schedule, with the load behind it.
Which means the pre-raise check has a gate of its own: no load pressing the tailgate, and pins released before the raise. When the first condition fails, the published text ends at the prohibition — it gives no permission to work the gate free with a partial raise, a pry bar or a helper behind the truck. The practical move is to stop and read the model-specific procedure in the body manual, or call the installer who set the body up and ask what that gate needs.
How to Confirm the Release Without Standing Behind
The manual keeps everyone well away from the operating area, forbids anyone standing behind a loaded dump body, and keeps the operator at the controls for the entire dumping process, away from moving parts and shielded from traffic or other hazards. The geometry explains why: the gate swings rearward, so the space behind the truck is where the gate and the load end up.
Imagine a spotter offering to watch the gate from a few feet back. The rule is drawn around the operating area, and the rear of a loaded body sits inside it, so the offer does not solve the confirmation problem. Which means the release gets confirmed from the machine's own state and from the sequence you followed, not from a walk to the back and a tug on the gate. Position, brake, PTO, cleared zone, pins out, then raise — if the pin state cannot be confirmed without stepping into that rear zone, it cannot be confirmed safely, and the answer is to stop and check the model manual or ask the body installer rather than improvise a reach-around.
PTO, Parking Brake, and the Travel Reset
The PTO is the power take-off that drives the hydraulic pump, and the manual is blunt about it: do not drive the truck with the PTO engaged, because doing so can seriously damage the chassis and hydraulic systems. That is why it sits in the setup sequence — engine on, parking brake set, PTO switch on the center dash panel — with the truck held still while the body does its work.
Coming back is its own sequence. The bed comes down, the gate goes back to latched, the PTO goes off, and only then does the truck move, since moving with the bed upright or the tailgate unlatched is forbidden outright. Travel configuration is a separate state from dump configuration, and the reset is an act you perform rather than something that happens by itself when the hoist lowers.
Where This Load King Check Stops
All of this is scoped to the Load King 16/18 ft dump body and the controls described in its manual. Pin arrangement, latch style, control location and the exact order can differ on another body, so the sequence above should not be carried over to a truck whose manual you have not read. Where the body is fitted to a chassis with its own hoist documentation, that documentation governs the parts it covers.
For a buyer, that converts into three questions worth asking before delivery: which manual covers this exact body, how are the tailgate pins released and how is the released state confirmed from the cab side, and what latch state must the truck be in before it moves. A dealer or installer who answers those from the paperwork instead of from memory is handing you something you can pass to a new driver on the first morning.
The question from the top of the page still gets the same answer, and it is settled before the hoist moves rather than after it: if load is pressing the gate when you walk up, the dump waits for the model manual. What the operator carries away is a second pass on the way out — the reset checked on its own terms before the truck rolls out of the yard.
