Dock leveler repair
A leveler that won't raise or hold takes a dock position out of service. Tell us what it's doing and we'll connect you with a local dock equipment repair company.
Request service- Free to use: the repair company pays us, not you
- Independent local companies that work on commercial doors and docks
- You get the quote directly from the company doing the work
Typical dock leveler problems
- Won't raise. On mechanical levelers, usually springs or the hold-down. On hydraulic units, the pump, motor or fluid level.
- Won't stay up or drifts down. Worn hold-down assembly or a leaking cylinder.
- Lip won't extend or won't stay extended. Lip hinge, lip cylinder or linkage wear.
- Hydraulic leaks. Hoses, fittings and cylinder seals.
- Cracked welds or a bent deck. Structural damage from heavy or off-center loads.
Types of leveler
Mechanical levelers use springs and a pull chain. Hydraulic levelers use a pump and cylinders and are operated by push button. Air-powered levelers use an air bag. Edge-of-dock units are smaller plates mounted on the dock face. Knowing which you have helps the repair company bring the right parts.
Safety first
Never work under a raised leveler unless the maintenance strut is in place. If a leveler dropped unexpectedly, take it out of service until it has been inspected.
How each type of leveler fails
Mechanical levelers are raised by springs when the operator pulls a release chain, then walked down onto the trailer bed. Their wear parts are the main springs, the hold-down that keeps the deck from springing back up, and the lip latch. A mechanical leveler that pops up while a forklift is on it has a failed hold-down and should come out of service.
Hydraulic levelers use an electric pump and cylinders, controlled by a push button. Failures are usually electrical (motor, contactor, control station) or hydraulic (low fluid, leaking hoses, worn cylinder seals, a sticking valve).
Air-powered levelers lift the deck with a low-pressure air bag and blower. The usual faults are a punctured or worn bag and a failed blower motor.
Edge-of-dock levelers are simpler plates on the dock face. Springs, hinge pins and lift mechanisms wear, and the units suffer from trailer impact.
What the symptom usually means
| What you see | Likely cause |
|---|---|
| Mechanical leveler won't rise when the chain is pulled | Weak or broken main springs, or a seized hold-down |
| Mechanical leveler won't stay down | Worn hold-down assembly |
| Hydraulic leveler: motor runs, deck doesn't rise | Low fluid, a failed pump or a valve fault |
| Hydraulic leveler: nothing happens at the button | No power, a tripped overload or a control fault |
| Deck sinks slowly with a load on it | Leaking cylinder seal or valve |
| Lip doesn't extend, or falls before reaching the trailer | Lip latch, lip cylinder or linkage worn; lip hinge seized |
| Deck sits above or below dock level when stored | Out of adjustment, debris in the pit, or a bent frame |
What a leveler service visit covers
- Cleaning the pit and checking the drain.
- Lubricating the lip hinge, rear hinge and linkages.
- Inspecting welds, the deck, the lip and the frame for cracks.
- Checking springs and the hold-down, or fluid level, hoses and cylinders.
- Testing the full range of travel, the lip, and any safety legs or velocity fuse.
- Checking toe guards, the maintenance strut and the control station.
- A written report of what was found and what needs attention next.
Capacity: why levelers get overloaded
A leveler's rated capacity is not the same as the heaviest load it can carry all day. The working load includes the forklift, its load, the speed it crosses at, and how many trucks a day are handled. A forklift fleet that has moved to heavier trucks, or a dock that has become busier, can put an older leveler past what it was chosen for. Cracked welds, a dished deck or a bent lip are the usual signs. If you see them, tell the repair company what trucks and loads cross the leveler.
Repair or replace a leveler
Repair makes sense for wear parts: springs, hold-downs, hoses, cylinders, lip hinges and controls. Replacement is worth pricing when the deck or frame is cracked or bent, when the leveler has needed repeated repairs, or when the dock's loads have outgrown its capacity. Converting a troublesome mechanical leveler to hydraulic operation is a common middle route; ask whether a conversion kit is available for yours.
Dock leveler repair: common questions
Is it safe to work under a raised dock leveler?
Only with the maintenance strut or support in place and the power locked out. Never rely on the hydraulics or springs alone to hold the deck up.
How often should dock levelers be serviced?
Planned maintenance is commonly done two to four times a year, depending on how many trucks the dock handles. Pits should be cleaned out more often.
Can a mechanical leveler be converted to hydraulic?
Often yes. Conversion kits replace the springs and hold-down with a pump and cylinder, which removes the parts that fail most and ends the need to pull a chain.
Why does my mechanical leveler pop up on its own?
The hold-down that keeps the deck down against its springs is worn or out of adjustment. Take the leveler out of use until it is repaired; a deck that rises under a forklift is dangerous.
What is that fluid in the leveler pit?
On a hydraulic leveler it is most likely hydraulic oil from a leaking hose, fitting or cylinder. It should be repaired and the pit cleaned, since oil on a dock floor is a slip hazard.
How long does a dock leveler last?
A well-maintained leveler commonly lasts 10 to 20 years or more. Life depends heavily on traffic, the loads crossing it and whether it is serviced.
Need a door or dock fixed?
Use the form at the top of this page.