Custom Trunnion Mount Cylinders Manufacturer

Every cylinder is pressure tested before shipment.
starts from 1piece, and samples typically ship within 7 to 15 days.
Send your drawings, we'll come back with a custom proposal and a clear quote.

Brands We Serve in Hydraulic Industry

Trunnion Mount Hydraulic Cylinders

Trunnion hydraulic cylinders are fixed on bearing seats via trunnion pins. They swing slightly around the trunnion center and self-adjust to fit angular movement during equipment operation. They work perfectly for excavators, cranes, dump trucks, marine steering systems and metallurgical machinery.

Piston rods are made of materials such as 45#, 40Cr and 42CrMo, which resist bending and deformation under long-term impact. For equipment working near the sea or in chemical plants, we recommend 316L stainless steel for trunnions. It has high hardness and can withstand heavy salt and corrosion in harsh environments to extend service life.

We manufacture trunnion-style cylinder with precise axis alignment and automated welding. Custom design and production are fully available according to customers’ drawings and practical working requirements.

Your Reliable Supplier of Trunnion Mount Hydraulic Cylinders

The mounting design of trunnion cylinders allows them to swing slightly around the trunnion axis, supply accurate power for working conditions with swing and angular displacement changes

We have years of experience in this area and have in-depth expertise in all types of MT4 mounting structures. According to customer requirements. we pay close attention to trunnion position and diameter, as well as welded joint design, let the cylinder performs well in real working conditions. With precise axis alignment and strict quality checks throughout production, we make sure the cylinder stays straight and leak-free even under continuous angular movement and heavy impact.

Send us your drawings. Our technical team will check every detail with you. Based on our experience, we may suggest improvements to make sure the final products meet your requirements and quality standards.

Trunnion Mount Hydraulic Cylinders

End Trunnion Cylinder

Tail-end trunnion cylinders have their pivot at the rear end of the barrel. The piston rod end moves with the equipment, transmitting only axial force to avoid side loading. This design works well for long-stroke, high-force applications. It’s commonly used in excavator booms, crane luffing systems, and mining breaker feed systems

Head Trunnion Cylinder

Head trunnion cylinders ’s swing pivot is located at the rod end. The cylinder body swings along with the equipment, which helps tuck the cylinder inside the machine structure. They are commonly found on aerial work platforms, telehandlers and various folding-linkage farm machines.

Intermediate Trunnion Cylinder

Intermediate trunnion cylinders are supported at the middle of the tube. Mounted in a suspended way, the cylinder can swing freely at both ends for balanced, stable loading. They work particularly well for long-stroke applications and are widely used on dump trucks, refuse compactors and truck-mounted cranes.

Fixed Trunnion Cylinder

For fixed trunnion cylinders, the trunnion mounts on the frame, the cylinder body does not swing and only produces linear thrust. Featuring a simple structure for easy installation and removal, they are commonly used on non-swinging equipment like metallurgical mill screw down mechanisms, heavy duty presses and marine hatch cover actuators.

Applications of Trunnion Mount Cylinders

Excavator Boom and Arm Actuation

The trunnion-mounted hydraulic cylinder is fitted at the hinge point of the excavator boom, hydraulic power extends and retracts the piston rod, moving the boom to lift, dig, and dump. It swings together with the boom to keep force balanced and lower the impact from side loads. The trunnion also absorbs part of the rebound force during digging, protecting the cylinder and make operation more efficient.

Dump Truck

The trunnion-mounted hydraulic cylinder sits between the dumper’s frame and cargo box, hydraulic power tilts the box up so goods slide out by gravity, and the box then lowers slowly under its own weight. The trunnion-mount design lets the cylinder swing as the box angle changes, let delivers thrust smoothly.The bearing housing use high strength design to handle heavy lifting loads, and extend service life.

Crane Luffing Mechanism

Trunnion mount cylinders are widely used on cranes, they push the boom to pivot upwards at its base, and work with the winch to lift, move and place heavy loads. The trunnion design has two support points, so the load is evenly distributed and it handles heavy loads well, it can take the pressure from the loaded boom and keeps the equipment running smoothly.

Steering Gear System

Trunnion-mounted hydraulic cylinders are also used for marine steering gears, the cylinder is fixed to the base with trunnions and linked to the tiller. When it works, it pushes the tiller side to side, turning the rudder, this changes the ship's direction using water force. The trunnion mount handles large-angle movement, built from 316L stainless steel, it stands up to heavy salt and corrosion in marine conditions.

Metallurgical Rolling Mill Equipment

Trunnion cylinders are used metallurgical rolling mills are fitted for swinging movement via trunnions, they drive side guides and wrapper rolls to feed steel into roll gaps and help wind steel coils. Trunnion is made of high-strength heat-resistant alloy steel, to keep the equipment running steadily under high-temperature and dusty metallurgical conditions.

Garbage Compactor Truck

Garbage compactors ‘s trunnion mount cylinders make the push plate back and forth to squeeze and push waste for compaction and discharge. The trunnion mount swings to adjust the force angle, adapting to changing waste density for reliable compaction. This trunnion-style design takes up little space, and delivers long compression strokes even in tight mounting areas.

Agricultural Machinery

Trunnion mounted cylinders are also used in agricultural machinery, they lift and lower farm tools behind tractors for field work, and tilt trailer boxes to dump materials. Farmlands have uneven ground, and the trunnion mount lets the cylinder adjust its angle to suit changing terrain. The cylinder uses dust seals and double-lip seals to keep dust and sand out, so the machine runs smoothly.

Mining machinery

The trunnion cylinder on the drill boom pushes the drill rod forward into the rock to drill holes.

Drilling angle and depth need adjusting for different rock layers, the trunnion flexes as the boom turns, keeping the cylinder force aligned with the drill rod. It suits drilling in various rock conditions and reduces side bending force for efficient equipment operation.

Side load Issue in Trunnion Mount Cylinder

Trunnion cylinders need to be installed precisely. If there are mistakes in fitting or manufacturing, it creates extra side loads. These loads can wear out the piston rod, cause oil leaks, or even bend or break the rod. The problems often only show up at certain angles, so they're hard to notice and easy to misdiagnose.

To solve this side-load issue, we do not only guarantee cylinder quality. At the early stage, we check key-part parallelism against drawings to keep parts aligned and prevent side loads, we also give customers clear advice on how to install the cylinder based on their working conditions.

Trunnion Bearing Wear and Corrosion in Trunnion Mount Cylinder

Trunnion bearings absorb most of the shock and impact from the cylinder. But over time, heavy loads cause wear, and the gap between the trunnion and the bearing housing gets bigger. This leads to shaking and sudden shocks, which speed up damage to seals and the piston rod. Especially in dusty or salt-spray environments, trunnions will rust or even break, which slows down work.

We select suitable trunnions and bearings according to customers’ actual working conditions,for marine use, we choose stainless steel that resists corrosion, for mining with heavy dust and impact, we use heat-treated wear-resistant materials. We also focus on trunnion lubrication and sealing, and precisely calculate the clearance between trunnions and bearing housings to guarantee reliable product quality.

Certifications

REACH Certificate

ISO 9001 Certificate

ISO 14001 Certificate

Certificate of Conformity

Why Work with Us

Selection assistance

We analyze movement and force based on your working conditions to suggest the best trunnion position. If you already have existing mounting requirements, we will also check whether they are reasonable and offer optimization proposals when needed, to ensure smooth production at a later stage.

Precision-fitted

We keep the trunnions and cylinder body aligned, so both trunnions are on the same axis,and calculate part clearances precisely to achieve even load distribution and smooth rotation during equipment operation.

Rigorous Quality Control

We strictly control the whole manufacturing process and do full testing and inspection to make sure product quality. In addition, we provide real time documentation and feedback, keeping our customers know the production progress and status.

Easy Maintenance

Our design fully takes on-site maintenance into account, include illustrated guides for assembly, and we can also supply special tools to make servicing easier. If you need, we offer complete maintenance solutions that save you time and effort.

Customization of Trunnion Hydraulic Cylinder

We customize trunnion cylinder based on customer drawing. Please send us your detailed drawings, and let us know the working conditions—like high temperature, high salt spray in air, or heavy dust on site. Also tell us about the equipment's movement path.

When we get your drawings, we go through all the technical details. Trunnion cylinders require good fit because cylinders need to work under high pressure. We also check if the trunnion diameter and bearing housing can handle the actual load. Based on our experience, we will tell you if any improvements are needed and give you a quote based on your order quantity.

From contract signing to final delivery, you can check production progress at any time. We keep control every key step to make sure the cylinders meet your specifications.