Low Price Double Acting Small Dump Truck Telescopic Hydraulic Cylinder

Before ordering the double-acting replacement, measure the existing single-acting cylinder: bore diameter, rod diameter, total stroke, retracted length, pin diameters (both ends), and extend port thread. These dimensions transfer directly to the new double-acting cylinder — the bore, stroke, stages, and mounting points stay the same. Provide these measurements when ordering from Korea Ever-Power. Also note the available space around the cylinder mounting point — the double-acting cylinder adds 10–25 mm to the retracted length and includes a second port that needs hose clearance.

Order all three components simultaneously so they arrive together: (1) the double-acting telescopic hydraulic cylinder from Korea Ever-Power, (2) a 4-way (4/3) directional control valve from your hydraulic component supplier — match the valve port size to your pump flow and match the valve centre position to your application (closed centre for hold, float centre for auto-lower), and (3) a hydraulic hose of the correct length, fitting thread, and pressure rating for the retract line.

Support the dump body with safety props. Disconnect the extend hose from the old cylinder and cap it. Remove the old cylinder from the mounting brackets. Remove the old 3-way control valve. Cap all open hydraulic line ends immediately — contamination entering during conversion is the most common cause of early seal failure on the new cylinder.

Install the new 4-way valve in the valve mounting position. Install the new double-acting cylinder in the brackets. Connect the existing extend hose to the cylinder extend port. Connect the new retract hose from the valve retract port to the cylinder retract port — route the hose along the frame with clamps to prevent chafing. Fill and bleed the system by cycling the cylinder 10+ times at no load (dump body empty). Verify extend, hold, and retract functions all work correctly before loading the truck.

Will the double-acting cylinder fit in the same space as my single-acting?

Almost. The bore, stroke, stage count, and pin dimensions are the same — so the mounting points match. The retracted length increases by 10–25 mm due to the retract port and internal passages. On most small dump trucks this small increase fits within the existing frame clearance. Confirm the exact retracted length on the Korea Ever-Power confirmation drawing before approving production — this is the one critical dimension to verify for conversion compatibility.

How long does the complete conversion take?

With all parts on hand (cylinder, valve, hose, fittings), a competent hydraulic technician can complete the conversion in 2–4 hours for a small dump truck. This includes: removing the old cylinder and valve (~30 min), installing the new cylinder and valve (~45 min), routing and connecting the retract hose (~30 min), filling and bleeding (~30 min), and testing under load (~30 min). Allow a full working day for the first conversion; subsequent trucks go faster as the technician becomes familiar with the procedure.

Can I keep my existing pump, or does it need upgrading?

Usually the existing pump stays. The double-acting cylinder's extend circuit uses the same flow and pressure as the single-acting — so the pump requirement for tipping is unchanged. The retract circuit uses less flow (smaller annular area) and lower pressure (pulling against seal friction plus body weight, not pushing a loaded body). The pump only needs upgrading if it was already marginal for single-acting operation — which would have manifested as slow tipping speed. If the single-acting tipping speed was acceptable, the pump is adequate for double-acting.

Converted 4 landscape dump trucks from single-acting to double-acting after switching to aluminium bodies. Used the conversion checklist from this page — cylinder from Ever-Power factory-direct, valves and hoses from our local hydraulic shop. Total conversion cost was approximately 35% more than just the cylinder price — the valve, hose, and fittings added up exactly as described. Each truck took about 3 hours. All 4 trucks now retract reliably regardless of body weight or temperature. The retracted length increase was 18 mm — fit with no issues on all 4 trucks.

I do SA→DA conversions regularly now — it's become a standard service request from customers with retraction problems. Ever-Power cylinders are my preferred choice because the dimensions are consistent and the dual-circuit test certificate gives the customer confidence. The budget framework on this page is accurate: the cylinder is about 55–60% of my total job cost, the valve about 20%, hose and fittings about 10%, and my labour about 15%. I now use this page to explain the conversion scope to customers before they commit — it sets expectations correctly and avoids the "I thought I only needed a cylinder" conversation.

Converted a customer's mini dump truck from single-acting to double-acting — 2-inch bore, 2-stage. Four stars because the retracted length increase of 22 mm was tight on this micro chassis — it fit, but with only 8 mm clearance to the cross-member. On standard small trucks this is not a problem, but on micro and mini trucks, always verify the exact retracted length before committing. The Ever-Power engineering team provided the confirmed retracted dimension within 2 days of my inquiry — fast enough to confirm fit before placing the order. Cylinder works perfectly after conversion.