{"id":2302,"date":"2026-06-29T05:59:11","date_gmt":"2026-06-29T05:59:11","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/?post_type=product&p=2302"},"modified":"2026-06-29T05:59:12","modified_gmt":"2026-06-29T05:59:12","slug":"high-quality-small-hydraulic-cylinder-telescopic-hydraulic-cylinder-for-dump-truck","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/it\/prodotto\/high-quality-small-hydraulic-cylinder-telescopic-hydraulic-cylinder-for-dump-truck\/","title":{"rendered":"High Quality Small Hydraulic Cylinder Telescopic Hydraulic Cylinder For Dump Truck"},"content":{"rendered":"
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SEAL TECHNOLOGY GUIDE<\/span>
\nHIGH QUALITY \u00b7 SMALL CYLINDER<\/span><\/div>\n

High Quality
\nSmall Telescopic Cylinder
\nFor Dump Truck \u2014 Seal Materials Explained<\/span><\/h2>\n

The quality of a telescopic hydraulic cylinder<\/a> is ultimately tested at the seals. The bore finish, dimensional accuracy, and weld integrity all serve one purpose: keeping the seals functional for as long as possible. But the seal material itself is equally critical \u2014 and choosing the wrong material for your dump truck’s operating environment is a quality decision that no amount of manufacturing excellence can compensate for.<\/p>\n<\/div>\n

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Seals<\/div>\n
4 Materials Explained<\/div>\n<\/div>\n
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Small<\/div>\n
Dump Truck<\/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
NBR \u00b7 PU \u00b7 PTFE \u00b7 FKM<\/span>
\nISO 9001<\/span>
\nG \/ SAE \/ NPT \/ M<\/span><\/div>\n
<\/div>\n
\"Small<\/div>\n<\/div>\n<\/div>\n

Korea Ever-Power manufactures this small telescopic hydraulic cylinder with a choice of four seal materials \u2014 each optimised for different operating environments. The standard seal material works well for most dump truck applications, but specific conditions (extreme temperatures, chemical exposure, high-dust environments, or extended service intervals) may require a different seal compound. Understanding what each material does \u2014 and where it fails \u2014 lets you specify the correct seal for your dump truck and maximise the time between seal replacements.<\/p>\n<\/section>\n

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Small Telescopic Dump Truck Cylinder \u2014 Customisation Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\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<\/td>\n<\/tr>\n
Seal Materials Available<\/td>\nNBR (standard) \u00b7 Polyurethane \u00b7 PTFE \u00b7 FKM\/Viton<\/td>\n<\/tr>\n
Customer-Specified Seal Brands<\/td>\nParker, NOK, Hallite, Busak+Shamban available on request<\/td>\n<\/tr>\n
Body \/ Certification<\/td>\nSteel \/ ISO 9001 \/ 100% pressure tested<\/td>\n<\/tr>\n
Lead Time \/ Warranty<\/td>\n25\u201335 days \/ 1 year<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

\"High<\/section>\n

<\/p>\n

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Four Seal Materials \u2014 Which One for Your Dump Truck<\/h2>\n

Each seal material has specific strengths and weaknesses. The correct choice depends on your dump truck’s operating temperature range, the type of hydraulic fluid, the dust and chemical exposure, and the desired service interval between seal replacements. Korea Ever-Power installs NBR as the default \u2014 but will substitute polyurethane, PTFE, or FKM on request when the operating environment demands it.<\/p>\n

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NBR (Nitrile) \u2014 The Standard<\/h3>\n

Temperature:<\/strong> \u221230 \u00b0C to +100 \u00b0C. Best for:<\/strong> general dump truck service with mineral hydraulic oil.<\/p>\n

NBR is the default seal material for hydraulic cylinders worldwide \u2014 good abrasion resistance, excellent compatibility with mineral oils, and a wide temperature range that covers most climates. It is the lowest-cost seal material and the most widely available. For dump trucks operating in temperate climates with standard mineral hydraulic fluid, NBR is the correct and most cost-effective choice. It does not tolerate biodegradable ester-based fluids or continuous temperatures above 100 \u00b0C.<\/p>\n<\/div>\n

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Polyurethane (PU) \u2014 Maximum Wear Resistance<\/h3>\n

Temperature:<\/strong> \u221235 \u00b0C to +80 \u00b0C. Best for:<\/strong> high-dust, high-abrasion environments.<\/p>\n

Polyurethane seals offer approximately 2\u20133\u00d7 the abrasion resistance of NBR \u2014 making them the preferred choice for dump trucks operating in highly abrasive environments: quarries, sandpits, demolition sites, and any application where fine dust particles contaminate the plunger surface. The superior wear resistance extends the seal replacement interval significantly compared to NBR in dusty conditions. The limitation is a narrower temperature range \u2014 PU becomes stiff and brittle below \u221235 \u00b0C and softens above +80 \u00b0C.<\/p>\n<\/div>\n

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PTFE \u2014 Low Friction, Chemical Resistant<\/h3>\n

Temperature:<\/strong> \u2212200 \u00b0C to +260 \u00b0C. Best for:<\/strong> chemical exposure, biodegradable fluids, extreme temperatures.<\/p>\n

PTFE seals are chemically inert \u2014 they tolerate virtually any hydraulic fluid including biodegradable esters, phosphate esters, and water-glycol fluids that attack NBR and PU. The temperature range is the widest of any seal material. PTFE also has the lowest friction coefficient, producing the smoothest cylinder extension. The limitation is that pure PTFE has lower wear resistance than PU \u2014 PTFE seals in abrasive environments wear faster. Carbon-filled or bronze-filled PTFE compounds improve wear resistance at the cost of higher friction.<\/p>\n<\/div>\n

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FKM \/ Viton \u2014 High Temperature<\/h3>\n

Temperature:<\/strong> \u221220 \u00b0C to +200 \u00b0C. Best for:<\/strong> hot environments, asphalt trucks, foundry applications.<\/p>\n

FKM (fluoroelastomer, brand name Viton) seals withstand continuous temperatures up to 200 \u00b0C \u2014 far beyond NBR’s 100 \u00b0C limit. This makes FKM the correct choice for dump trucks hauling hot asphalt, operating near furnaces or foundries, or any application where the hydraulic fluid temperature regularly exceeds 80\u201390 \u00b0C. FKM is the most expensive seal material \u2014 typically 3\u20135\u00d7 the cost of NBR \u2014 but essential when the temperature kills NBR seals prematurely. FKM does not perform well below \u221220 \u00b0C.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Seal Material Selection \u2014 Match Your Operating Environment<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n
Your Environment<\/th>\nRecommended Seal<\/th>\nWhy<\/th>\n<\/tr>\n<\/thead>\n
Standard dump truck, mineral oil, \u221220 to +80 \u00b0C<\/td>\nNBR<\/td>\nDefault choice \u2014 best cost\/performance balance<\/td>\n<\/tr>\n
Quarry, sandpit, demolition (high dust)<\/td>\nPU<\/td>\n2\u20133\u00d7 abrasion resistance of NBR<\/td>\n<\/tr>\n
Biodegradable fluid, water-glycol, chemical<\/td>\nPTFE<\/td>\nChemically inert \u2014 tolerates all fluids<\/td>\n<\/tr>\n
Arctic \/ extreme cold (below \u221230 \u00b0C)<\/td>\nPTFE or NBR<\/td>\nPU and FKM become brittle in extreme cold<\/td>\n<\/tr>\n
Hot asphalt, foundry, high-temp environment<\/td>\nFKM<\/td>\nContinuous rating to +200 \u00b0C<\/td>\n<\/tr>\n
Coastal \/ salt-spray \/ marine-adjacent<\/td>\nPU or FKM<\/td>\nBetter corrosion-environment performance than NBR<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Specify at order: <\/strong>
\nIf you do not specify a seal material, Korea Ever-Power installs NBR (the industry standard). To request PU, PTFE, or FKM, state this explicitly in your order specification. Non-standard seal materials may add 3\u20137 days to the lead time if the specific seal profile needs to be sourced. Customer-specified seal brands (Parker, NOK, Hallite) are also available \u2014 specify both the material AND the brand if you have a preference for both.<\/span><\/div>\n<\/section>\n

<\/p>\n

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Beyond Material \u2014 Seal Profiles in a Telescopic Cylinder<\/h2>\n

A telescopic cylinder does not use a single seal at each stage junction \u2014 it uses a seal set consisting of multiple profiles, each performing a different function. Understanding these profiles explains why a generic O-ring cannot replace a proper hydraulic seal set, and why the quality of the seal installation matters as much as the seal material itself.<\/p>\n

\"Small<\/p>\n

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Piston Seal (U-cup or Vee-pack)<\/strong><\/p>\n

The primary pressure seal on the piston \u2014 prevents oil from bypassing across the piston from the pressure side to the return side. This seal determines whether the cylinder holds load or drifts. A worn piston seal causes internal bypass \u2014 the dump body slowly lowers under load even when the control valve is in the hold position.<\/p>\n<\/div>\n

Rod Seal (Lip seal)<\/strong><\/p>\n

Seals the plunger rod as it passes through the end cap \u2014 prevents oil from leaking externally. A worn rod seal is the most visible failure: oil drips from the cylinder end cap onto the ground. The rod seal lip rides on the plunger surface, so the plunger surface finish directly affects rod seal life \u2014 a scratched plunger destroys the rod seal.<\/p>\n<\/div>\n

Wiper Seal (Scraper)<\/strong><\/p>\n

Mounted outboard of the rod seal \u2014 scrapes dirt, dust, and water from the plunger surface as it retracts. The wiper prevents external contaminants from entering the cylinder and damaging the rod seal and bore. In dusty dump truck environments, the wiper is the first line of defence against abrasive particles \u2014 a failed wiper accelerates the failure of every seal behind it.<\/p>\n<\/div>\n

Guide Ring (Wear band)<\/strong><\/p>\n

Not a seal but a critical support element \u2014 the guide ring centres the plunger inside the bore, preventing metal-to-metal contact. It carries the radial (side) load that the dump body applies during tipping. Without guide rings, the plunger would contact the bore wall, scoring both surfaces and rapidly destroying all seals. Guide rings are typically made from PTFE or phenolic composite material. Their quality determines the “stability” of the telescopic cylinder \u2014 the smooth, wobble-free extension described in the hydraulic cylinder product pages<\/a> across this catalogue.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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OEM & ODM \u2014 Specifying Seals for Your Application<\/h2>\n
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What You Provide<\/h3>\n<\/div>\n
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Bore, rod, stroke, stage count, mounting type, port thread, working pressure \u2014 plus your operating environment: temperature range, dust level, hydraulic fluid type, chemical exposure, and desired service interval. If you want a specific seal brand (Parker, NOK, Hallite), specify both the brand and material. The engineering team will confirm compatibility.<\/p>\n<\/div>\n<\/div>\n

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What Ever-Power Delivers<\/h3>\n<\/div>\n
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Drawing with seal specification confirmed (material + profile + brand). Samples available. Production 25\u201335 days (add 3\u20137 days for non-standard seals). 100% pressure test with certificate. 1-year warranty. Browse the complete telescopic cylinder range<\/a> for other dump truck configurations.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Seal Technology FAQ<\/h2>\n
\n
\n

Can I use a generic O-ring instead of a hydraulic seal set?<\/h3>\n

No. A generic O-ring is a static seal designed for stationary joints \u2014 it has no lip geometry for dynamic sealing, no wiper function, and no guide ring support. Installing O-rings in a telescopic cylinder results in immediate leakage, bore scoring (no guide ring = metal contact), and rapid O-ring destruction from the dynamic plunger movement. Always use the correct hydraulic seal set (piston seal + rod seal + wiper + guide ring) designed for the specific bore and rod dimensions.<\/p>\n<\/div>\n

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How do I know when my seals need replacing?<\/h3>\n

Three symptoms indicate seal wear: (1) External oil leak at a stage junction or end cap \u2014 the rod seal has failed. (2) Dump body drifts slowly downward under load \u2014 the piston seal has internal bypass. (3) Dust and moisture visible on the plunger surface inside the wiper \u2014 the wiper seal has failed. Any of these symptoms means the cylinder needs a seal overhaul. Do not continue operating a leaking cylinder \u2014 the leak will worsen, the bore may be damaged by contamination entering through the failed wiper, and the hydraulic fluid level will drop.<\/p>\n<\/div>\n

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Does the seal material choice affect the cylinder price?<\/h3>\n

Yes, slightly. NBR is the lowest cost. PU is approximately 10\u201320% more per seal set. PTFE is approximately 30\u201350% more. FKM is approximately 200\u2013400% more (3\u20135\u00d7 NBR cost). However, seals are a small percentage of the total cylinder cost \u2014 the material cost difference across a full seal set typically adds only 2\u20138% to the cylinder price. The service life improvement from choosing the correct material far outweighs the small upfront cost increase.<\/p>\n<\/div>\n

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Can seal sets be purchased separately for field overhaul?<\/h3>\n

Yes. Korea Ever-Power can supply replacement seal sets for cylinders they have manufactured \u2014 matched to the specific bore, rod, and groove dimensions of your cylinder’s serial number. Order seal sets by cylinder serial number to ensure exact dimensional match. Seal sets for forklift cylinders<\/a> and aerial work vehicle cylinders<\/a> are also available from the same factory.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Field Reports<\/h2>\n
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B<\/div>\n
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Brett S. \u2014 Quarry Operator<\/div>\n
Verified Purchase \u00b7 South Africa \u00b7 May 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our dump trucks work in a basalt quarry \u2014 the dust is incredibly abrasive. Standard NBR seals on our previous cylinders lasted about 8 months before the rod seals started leaking. Switched to Ever-Power cylinders with polyurethane (PU) seals, same bore and stroke. The PU seals are now at 14 months with no leakage \u2014 nearly double the NBR lifespan in the same dust conditions. The PU seals cost approximately 15% more than NBR, but the extended service life saves us one complete seal overhaul per truck per year. The math is overwhelmingly in favour of PU for quarry duty.<\/p>\n<\/div>\n

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F<\/div>\n
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Fabio T. \u2014 Asphalt Paving Company<\/div>\n
Verified Purchase \u00b7 Italy \u00b7 March 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our hot asphalt dump trucks operate with hydraulic fluid temperatures reaching 95\u2013100 \u00b0C near the dump body. Standard NBR seals harden and crack within 12 months at these temperatures. We specified FKM (Viton) seals on the Ever-Power replacement cylinders. After 10 months of asphalt duty, the seals show no degradation \u2014 the FKM handles the heat without any issue. Yes, FKM costs 4\u00d7 more than NBR per seal set \u2014 but the total seal cost is only about 5% of the cylinder price, and the FKM seals will last 3\u20134\u00d7 longer in our hot environment. Best specification decision we’ve made.<\/p>\n<\/div>\n

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E<\/div>\n
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Erik N. \u2014 Municipal Fleet (Biodegradable Fluid)<\/div>\n
Verified Purchase \u00b7 February 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Our municipality mandates biodegradable hydraulic fluid (rapeseed ester) on all equipment operating near waterways. Standard NBR seals swell and fail within 6 months in this fluid. We specified PTFE seals on our Ever-Power dump truck cylinders \u2014 8 months in service with zero seal issues. Four stars because the PTFE seal order added 5 days to the lead time (sourcing the specific PTFE compound for our bore size). Plan accordingly if you need PTFE \u2014 the standard NBR ships faster. The cylinder quality and dimensional accuracy are excellent regardless of seal material.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Other Hydraulic Cylinder Categories<\/h2>\n
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\"Forklift\"<\/p>\n

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Forklift Hydraulic Cylinder OEM \u2192<\/a><\/h3>\n

Lift, tilt, steer \u2014 HCYY part numbers available.<\/p>\n<\/div>\n<\/div>\n

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

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Boom Lift & Scissor Lift Cylinders \u2192<\/a><\/h3>\n

15 types for aerial work platforms.<\/p>\n<\/div>\n<\/div>\n

\n

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

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Complete Hydraulic Cylinder Catalogue \u2192<\/a><\/h3>\n

Welded, tie-rod, telescopic \u2014 all industries.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

High quality small telescopic hydraulic cylinder for dump trucks \u2014 with a technical guide to seal technology. The seals are the most wear-critical components in any telescopic cylinder: they contain the hydraulic pressure, prevent external leaks, and protect the bore from contamination. The seal material \u2014 NBR, polyurethane, PTFE, or FKM \u2014 determines how long the cylinder operates before its first leak, and which operating environments the cylinder can tolerate. This page explains each seal material, its strengths and limitations, and which material to specify for your dump truck’s operating conditions.<\/div>","protected":false},"featured_media":2273,"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-2302","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\/it\/wp-json\/wp\/v2\/product\/2302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/comments?post=2302"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/media\/2273"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/media?parent=2302"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product_brand?post=2302"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product_cat?post=2302"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product_tag?post=2302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}