--- title: "Dump Trucks Repair in West Covina" description: "Hoist mount, hinge, floor, side sheet and tailgate structural repair for dump bodies working out of West Covina." canonical: https://ocrv.xyz/vehicles/commercial-trucks/dump-trucks/ business: "OCRV Center" phone: "(949) 799-3387" address: "23281 La Palma Ave, Yorba Linda, CA 92887" market_served: "West Covina, California" --- # Dump Trucks Repair in West Covina OCRV Center repairs dump bodies for West Covina contractors at the Yorba Linda shop: hoist mount plate cracks, hinge boss rebuilding, floor and side sheet replacement, tailgate straightening, tarp rail repair, cab guard mounting and refinishing. Hydraulic pumps, cylinders, PTO systems, engines and brakes stay with your equipment service provider. ## Common damage - Hoist mount plate cracked at the weld where the cylinder trunnion loads it - Rear hinge pin bosses elongated so the body sits crooked when lowered - Floor plate worn thin or holed at the front where material lands first - Side sheet dented, torn and bowed outward from oversized material - Tailgate bent, with latch and hinge geometry no longer aligning - Tailgate hinge pin and pivot bushings worn out of round - Top rail and side stiffener distortion from loader bucket contact - Cab guard and canopy mounting cracked from cyclic load - Tarp rail and bow damage so the roll tarp will not track - Frame rail cracking near the hoist and body mounting where the load concentrates ## Hoist mount plates and where a dump body actually cracks The hoist mount plate is the highest stress joint on a dump body. Every load goes through the cylinder trunnion into that plate, and the load is cyclic: up, down, up, down, thousands of times. Cracks start at the weld toe where the plate meets the frame or the body longitudinal, they are hairline for a long time, and they are only visible after the area is cleaned. The wrong repair is to run a bead over the crack. Welding over a fatigue crack leaves the crack root in place and adds a new heat affected zone next to it, so the failure returns bigger. The correct repair is to remove the cracked material entirely, prepare the joint for full penetration, replace with plate of correct specification and thickness, weld it in with proper technique, and add gusseting where the design allows the load to be spread. We also look at why it cracked. A hoist plate that fails early is often on a body whose mounting has loosened, so the body is moving relative to the frame and loading the trunnion off axis. Fixing the plate without fixing the mounting means seeing the same truck again. The estimate covers both, and we show you what we found. - Cracked plate material removed entirely, never welded over - Full penetration preparation and correctly specified replacement plate - Gusseting added where geometry allows the load to spread - Body to frame mounting checked so the trunnion is not loaded off axis - Frame rail inspected near the hoist for cracks propagating from the mount ## Hinge bosses, tailgates and a body that lands crooked When a dump body no longer sits flat on the frame after it comes down, the rear hinge pin bosses have usually elongated. The pins wear, the bore goes oval, and the body gains play at the rear that shows up as a body sitting a half inch low on one side and a tailgate that will not latch evenly. Operators often try to solve it at the latch, which never works. The repair is at the bosses. We bore out the worn material, weld in new bushing stock, machine or ream to the correct pin size, and fit new pins. Where the surrounding structure has cracked from the same wear, that gets rebuilt at the same time. Getting the two sides matched is what makes the body land flat again. Tailgates take direct abuse from material and from the loader bucket, and they bend at the stiffener line. A bent tailgate does not seal at the bottom, so material trickles the entire drive, and it does not latch consistently. We straighten tailgates where the section allows, replace stiffeners and sheet where they are torn, re bush the pivot points, and reset the latch geometry to the corrected gate. Air and cable latch hardware is repaired mechanically as part of the gate assembly, but hydraulic tailgate systems go back to your equipment supplier. ## Floors, side sheets and the wear pattern of a working dump A dump body floor wears in a predictable map. Material lands at the front, slides the length of the floor on every dump, and exits over the tail. So the front section thins first, then the center, and the last third stays comparatively good. When the front section is holed or dished, letting in new plate for the worn section is normal work and costs a fraction of a new body. Plate selection matters. Replacing a worn floor section with plate that is softer than the original just moves the wear point. We match or upgrade to abrasion resistant plate appropriate to what you haul: a body running dirt and green waste and a body running broken concrete are not the same specification. Side sheets dent from oversized material and bow outward from repeated overload. The sheet itself is repairable in most cases, but the top rail and the vertical stiffeners are the structure and they decide whether a bow is fixable. We straighten stiffeners, let in new sheet sections where the metal is torn, rebuild the top rail, and check that the body still closes squarely against the tailgate afterward. On landscape bodies with removable sides, the post pockets and the side panel hardware are rebuilt the same way stake pockets are on a flatbed. - Front floor sections let in with abrasion resistant plate matched to the material hauled - Side sheet sections replaced with stiffeners straightened or renewed - Top rail rebuilt so the body closes square to the tailgate - Removable side post pockets rebuilt into sound rail material ## Cab guards, tarp systems and custom dump body fabrication Cab guards and canopies crack at their mounts, not in the middle. The guard is bolted to a body that flexes and to a frame that twists, so the brackets carry the differential movement. We rebuild those mounts with load spreading and gusseting, tie them into structure rather than into sheet, coat before install, and repair or replace the guard itself where it has been struck. Roll tarp systems on dumps only work if the rails are straight. A rail bent by a loader bucket or by material overhang means the tarp binds, the operator forces it, and the crank or the housing breaks next. We straighten or replace rails, replace bent bows, rebuild the housing mounting, and reset the system to track. The tarp fabric itself is a canvas supplier item. Fabrication requests on dumps are common: a taller side extension for green waste, a spreader apron, a ladder and platform, a toolbox that mounts without fouling the hoist, tie down points for equipment, or a rebuilt headboard. All of it gets measured on the truck, drawn, approved, built in appropriate material, coated and installed. Mounting always goes into structure with load spread, because a bracket bolted to a side sheet is a future tear out. ## What stays outside our scope on a dump truck OCRV Center is a body, structural, fabrication and paint facility. On a dump truck that means we handle the body, the mounting, the hinges, the tailgate, the cab guard, the tarp rails, the cab and the paint. It does not include hydraulics. Pumps, cylinders, valves, hoses, PTO drives and the controls that operate them are equipment service work and stay with your hydraulic or equipment supplier. It also does not include engine, drivetrain, transmission, differential or brake work, and we do not perform DOT inspections. Those belong with your dealer or heavy truck mechanical shop. We are not going to pretend otherwise, and being clear about it up front is why fleet customers use us for what we actually do well. Practically, that means coordination. If your body is coming in for a hoist plate rebuild and the cylinder needs resealing, do the cylinder work with your supplier while the body is apart, since access will never be better. Tell us the schedule at the estimate and we will work around it. The shop is in Yorba Linda, about 22 miles from West Covina, and hours are Monday through Friday 8:00 AM to 5:00 PM and Saturday 9:30 AM to 3:00 PM. Call (949) 799-3387 to arrange it. ## Frequently asked questions ### There is a crack at my hoist mount. Can it just be welded up? Running a bead over a fatigue crack is the repair that brings trucks back. The crack root stays in the metal and a new heat affected zone gets added right next to it, so the failure returns larger. The durable repair removes the cracked material entirely, prepares the joint for full penetration, replaces with correctly specified plate, and adds gusseting where the geometry allows. We also check why it cracked, since loose body mounting is often the underlying cause. ### My dump body sits crooked when it comes down. What is worn? The rear hinge pin bosses, almost certainly. The pins wear, the bores go oval, and the body gains play at the rear that shows up as one side sitting low and a tailgate that will not latch evenly. We bore out the worn material, weld in new bushing stock, ream to correct pin size and fit new pins on both sides so the body lands flat. Working at the latch instead never solves it. ### The front third of my dump floor is worn through. Do I need a new body? Usually not. The wear map on a dump floor is predictable: material lands at the front, so the front section thins first while the rear third is still good. Letting in a new floor section costs a fraction of a body and, when the plate is matched or upgraded to the right abrasion resistant specification for what you haul, it outlasts the section it replaced. We look at the whole floor before recommending either path. ### Can you build taller sides on my dump for green waste? Yes. We measure on the truck, draw the extension, agree the material and height with you, then build, coat and install it. The important part is the mounting: extensions bolted or tacked to the side sheet tear out, so we tie them into the top rail and the vertical stiffeners with load spreading. We also check whether the extra volume changes how the body loads the hoist, and we say so if it does. ### Do you repair the hydraulic cylinder or the PTO on my dump? No. Pumps, cylinders, valves, hoses, PTO drives and their controls are equipment service work and belong with your hydraulic supplier. We handle the structure they mount to, which is where the failures usually are: hoist plates, hinge bosses, body mounting and frame reinforcement. If your cylinder needs service, schedule it while the body is apart for structural work, because access will never be better than that. --- OCRV Center, 23281 La Palma Ave, Yorba Linda, CA 92887. Phone (949) 799-3387. All work is performed in shop at the Yorba Linda facility. We do not run mobile, roadside or fleet route service. Ranges are planning figures, not a quote. Final numbers come from a written estimate on your vehicle.