{"id":2288,"date":"2026-06-26T07:58:38","date_gmt":"2026-06-26T07:58:38","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/?post_type=product&p=2288"},"modified":"2026-06-26T07:58:38","modified_gmt":"2026-06-26T07:58:38","slug":"high-quality-double-acting-dump-truck-telescopic-hydraulic-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/th\/product\/high-quality-double-acting-dump-truck-telescopic-hydraulic-cylinder\/","title":{"rendered":"High Quality Double Acting Dump Truck Telescopic Hydraulic Cylinder for Sale"},"content":{"rendered":"
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<\/p>\n

\n
\n
\n
DOUBLE ACTING<\/span>
\nDUMP TRUCK SPECIFIC<\/span><\/div>\n

Double Acting
\nDump Truck
\nTelescopic Cylinder
\nControlled Raise + Controlled Lower<\/span><\/h2>\n

Most dump trucks use single-acting telescopic cylinders<\/a> \u2014 gravity does the lowering. But specific dump truck configurations cannot rely on gravity, and these trucks need the double-acting version: hydraulic force to raise the dump body AND hydraulic force to pull it back down.<\/p>\n<\/div>\n

\n
\n
\n
Double<\/div>\n
Acting<\/div>\n<\/div>\n
\n
Dump Truck<\/div>\n
Application<\/div>\n<\/div>\n
\n
2\u20136\u2033<\/div>\n
Bore<\/div>\n<\/div>\n
\n
4\u2013100\u2033<\/div>\n
Stroke<\/div>\n<\/div>\n<\/div>\n
Steel Body<\/span>
\nISO 9001<\/span>
\n2 Ports Required<\/span>
\nOEM & ODM<\/span><\/div>\n
\"Telescopic<\/div>\n<\/div>\n<\/div>\n

Korea Ever-Power manufactures this double-acting telescopic cylinder specifically for dump truck applications where gravity return is unreliable or where the operator requires controlled lowering speed. The double-acting design adds retract-side seals, internal oil passages, and a second hydraulic port \u2014 increasing cost by approximately 20\u201340% over the single-acting equivalent. The premium is justified when the dump truck’s hoist geometry, body weight, or discharge material requires hydraulic retraction.<\/p>\n<\/section>\n

\u00a0\"Telescopic<\/p>\n

\n

Double Acting Dump Truck Cylinder \u2014 Customisation Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\n
Acting Type<\/td>\nDouble-acting (hydraulic extend + retract)<\/td>\n<\/tr>\n
Bore \/ Rod \/ Stroke \/ Pin<\/td>\n2\u20136\u2033 \/ 1.125\u20134\u2033 \/ 4\u2013100\u2033 \/ 0.5\u20132\u2033 (all customisable)<\/td>\n<\/tr>\n
Port Options<\/td>\nG \/ SAE \/ NPT \/ M \u2014 two ports (extend + retract)<\/td>\n<\/tr>\n
Application<\/td>\nDump trucks requiring controlled bi-directional operation<\/td>\n<\/tr>\n
Certification \/ Lead Time<\/td>\nISO 9001 \/ 25\u201335 days<\/td>\n<\/tr>\n
Warranty<\/td>\n1 year<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

\"Double<\/section>\n

<\/p>\n

\n

Three Dump Truck Configurations That Require Double-Acting<\/h2>\n

The majority of dump trucks use single-acting telescopic cylinders successfully. Double-acting is required only in specific configurations where gravity return fails or where controlled lowering is operationally necessary. Understanding which configuration your truck uses determines whether double-acting is essential or an unnecessary expense.<\/p>\n

\n
\n

Front-Push Hoist with Shallow Cylinder Angle<\/h3>\n

In a front-push hoist configuration, the telescopic cylinder mounts behind the cab and pushes the dump body at an angle \u2014 often 30\u201345\u00b0 from horizontal at the start of the tipping stroke. At these shallow angles, the gravitational force component acting along the cylinder axis may be insufficient to overcome seal friction and retract the stages. The dump body reaches full tip angle, but will not lower when the driver releases the control lever. Double-acting provides the hydraulic retract force needed to pull the body down from any angle.<\/p>\n<\/div>\n

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Aluminium Dump Bodies<\/h3>\n

Aluminium dump bodies weigh 40\u201360% less than equivalent steel bodies. This weight reduction improves payload capacity but also reduces the gravitational force available to retract the telescopic cylinder. An aluminium body that weighs 800 kg instead of 1,500 kg may not generate enough force to push all stages back in \u2014 especially after a few years of service when seal friction increases. Double-acting eliminates the dependence on body weight for retraction, making it the standard choice for aluminium dump body trucks.<\/p>\n<\/div>\n

\n

Controlled Discharge Speed<\/h3>\n

Dump trucks hauling asphalt, liquid waste, or grain must lower the dump body at a controlled rate to prevent material spillage, sloshing, or sudden load shift. With single-acting, the lowering speed is determined by gravity and the flow restriction through the control valve \u2014 the operator has limited control. With double-acting, the lowering speed is controlled by the metered hydraulic flow on the retract circuit \u2014 the operator can lower the body at any speed from very slow to rapid, maintaining full control throughout the descent.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

High Quality Double-Acting \u2014 Why Quality Matters More on Double-Acting Cylinders<\/h2>\n

A double-acting telescopic cylinder has twice the seal count of a single-acting \u2014 which means quality defects in seal installation, bore finish, or dimensional accuracy have twice the impact. A single poor seal on the retract side of one stage creates an internal bypass that reduces retract force on that stage, causing uneven lowering or incomplete retraction. Korea Ever-Power applies the same quality controls to double-acting that make single-acting reliable \u2014 but with additional attention to the retract-circuit integrity.<\/p>\n

\n
Both Circuits Pressure-Tested<\/strong><\/p>\n

Every double-acting cylinder is pressure-tested on both the extend circuit and the retract circuit \u2014 at 1.5\u00d7 working pressure each. The test certificate documents both test results. A cylinder that passes the extend test but fails the retract test is rejected \u2014 both circuits must hold pressure for the cylinder to ship.<\/p>\n<\/div>\n

Internal Passage Leak Test<\/strong><\/p>\n

The internal oil passages that route retract fluid through the nested stages must be leak-free \u2014 any internal leak reduces the retract force and may cause cross-contamination between the extend and retract circuits. The passage joints are tested as part of the assembly process before the cylinder is completed.<\/p>\n<\/div>\n

Retract Seal Verification<\/strong><\/p>\n

After the pressure test, the cylinder is cycled 3\u20135 times to verify that all stages extend and retract smoothly under hydraulic power. Any stage that hesitates, sticks, or fails to retract fully under retract pressure is flagged for investigation \u2014 the retract-side seal on that stage may be incorrectly installed or undersized.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

OEM & ODM<\/h2>\n
\n
\n
\n

What You Provide<\/h3>\n<\/div>\n
\n

Bore, rod, stroke, stage count, retracted length, mounting type, both port threads, working pressure, and dump truck model or hoist configuration (front-push, under-body, scissor). Specify aluminium or steel body weight if the double-acting requirement is driven by body weight. For replacements: old cylinder measurements or sample.<\/p>\n<\/div>\n<\/div>\n

\n
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What Ever-Power Delivers<\/h3>\n<\/div>\n
\n

Drawing 2\u20133 days. Samples available. Production 25\u201335 days. 100% dual-circuit pressure test with certificate. 1-year warranty. Contact Korea Ever-Power<\/a> for quotation \u2014 specify “double-acting” explicitly.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

Double Acting Dump Truck Cylinder \u2014 FAQ<\/h2>\n
\n
\n

My dump truck currently has single-acting \u2014 should I upgrade to double-acting?<\/h3>\n

Only if you are experiencing retraction problems (dump body fails to lower, stages stick in extended position, body slams down uncontrolled) or if you are converting to an aluminium dump body that weighs significantly less than the original steel body. If your current single-acting cylinder retracts reliably, there is no engineering reason to switch to double-acting \u2014 it would add cost and complexity without benefit.<\/p>\n<\/div>\n

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Does double-acting require changes to my truck’s hydraulic system?<\/h3>\n

Yes. Single-acting uses a 3-way valve and one hose line. Double-acting uses a 4-way directional control valve and two hose lines. You will need to: replace the control valve (or add a second valve section), run an additional hydraulic hose from the valve to the cylinder retract port, and ensure the pump can supply adequate flow for the retract circuit. If converting from single to double-acting, budget for the valve and plumbing upgrade in addition to the cylinder cost.<\/p>\n<\/div>\n

\n

What happens if I accidentally order single-acting for a dump truck that needs double-acting?<\/h3>\n

The cylinder will extend correctly (tipping the dump body up) but will not retract under its own hydraulic power. The dump body will stay in the tipped position unless there is sufficient weight to push the stages back in by gravity. If gravity return fails, you have a truck with the dump body stuck in the air \u2014 requiring manual intervention or an external force to lower it. This is a safety concern and an operational failure. Always verify the acting type requirement before ordering.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Field Reports<\/h2>\n
\n
\n
\n
W<\/div>\n
\n
Wayne S. \u2014 Aluminium Body Dump Truck Operator<\/div>\n
Verified Purchase \u00b7 Alberta, Canada \u00b7 May 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Switched to an aluminium dump body to increase payload \u2014 saved 700 kg of body weight. The old single-acting cylinder could no longer retract reliably because the lighter aluminium body didn’t generate enough gravity force. Replaced with Ever-Power double-acting at the same bore and stroke, added a second hose line and upgraded to a 4-way valve. Problem solved \u2014 the body raises and lowers smoothly under hydraulic control. The controlled lowering speed is actually a bonus I didn’t expect \u2014 I can now meter the descent rate for asphalt loads.<\/p>\n<\/div>\n

\n
\n
T<\/div>\n
\n
TruckBuild Co \u2014 Front-Push Hoist Manufacturer<\/div>\n
Verified Purchase \u00b7 USA \u00b7 March 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

All our front-push hoist dump trucks use double-acting telescopic cylinders \u2014 the cylinder angle at the start of the tipping stroke is approximately 35\u00b0, which is too shallow for gravity retraction. Ever-Power double-acting, 5-inch bore, 4-stage, SAE ports. We’ve standardised on this specification for our 20-tonne class trucks. 24 units delivered over 8 months. Both circuits tested at 1.5\u00d7 \u2014 the dual-circuit test certificate is required by our fleet customer’s insurance auditor. Quality has been consistent across all batches.<\/p>\n<\/div>\n

\n
\n
I<\/div>\n
\n
Ivan M. \u2014 Municipal Fleet Manager<\/div>\n
Verified Purchase \u00b7 February 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Our municipal waste trucks need controlled lowering \u2014 the container body holds liquid waste and slamming it down causes spillage. Switched from single-acting (gravity slam) to Ever-Power double-acting on 3 trucks. The metered retract speed eliminated the spillage problem completely. Four stars because we had to upgrade all three trucks’ control valves from 3-way to 4-way, which added approximately 15% to the total conversion cost. The cylinder quality and performance are excellent \u2014 the additional valve cost is a system cost, not a cylinder quality issue.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Other Hydraulic Cylinder Categories<\/h2>\n
\n
\n

\"Forklift\"<\/p>\n

\n

Forklift Cylinders \u2192<\/a><\/h3>\n

Lifting, tilt, steering. HCYY OEM parts.<\/p>\n<\/div>\n<\/div>\n

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\"AWV\"<\/p>\n

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AWV Cylinders \u2192<\/a><\/h3>\n

Scissor\/boom lift \u2014 15 types.<\/p>\n<\/div>\n<\/div>\n

\n

\"All\"<\/p>\n

\n

All Cylinders \u2192<\/a><\/h3>\n

Complete catalogue.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"
High quality double acting telescopic hydraulic cylinder for dump trucks \u2014 hydraulic power on both extend and retract strokes, giving the driver full control over the dump body in both directions. Most dump trucks use single-acting telescopic cylinders with gravity return, but three dump truck configurations specifically require double-acting: front-push hoists where the cylinder angle is too shallow for gravity retraction, aluminium dump bodies too light for reliable gravity return, and precision discharge applications where the lowering speed must be metered. Custom bore 2\u20136 inch, stroke 4\u2013100 inch. G\/SAE\/NPT\/M. ISO 9001. Korea Ever-Power OEM & ODM.<\/div>","protected":false},"featured_media":2270,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[851],"product_tag":[],"class_list":["post-2288","product","type-product","status-publish","has-post-thumbnail","product_cat-telescopic-hydraulic-cylinder","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/product\/2288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/comments?post=2288"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/media\/2270"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/media?parent=2288"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/product_brand?post=2288"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/product_cat?post=2288"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/th\/wp-json\/wp\/v2\/product_tag?post=2288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}