{"id":2555,"date":"2026-07-01T06:03:16","date_gmt":"2026-07-01T06:03:16","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/large-excavator-tightening-cylinder\/"},"modified":"2026-07-01T06:03:22","modified_gmt":"2026-07-01T06:03:22","slug":"large-excavator-tightening-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/nl\/product\/large-excavator-tightening-cylinder\/","title":{"rendered":"Large Excavator Tightening Cylinder"},"content":{"rendered":"

<\/p>\n
\n \"Large<\/p>\n
\n Large Excavator \u00b7 4th of 4 \u00b7 Final<\/span><\/p>\n

Large Excavator Tightening Cylinder<\/h2>\n

Not a digging cylinder. Not part of the arm. This cylinder lives inside the track frame \u2014 hidden, rarely discussed, but responsible for keeping the entire undercarriage running. It pushes the front idler forward, stretching the track chain to the correct tension. Get it wrong, and the track derails or the rollers die early.<\/p>\n

\n
280\u2013380mm<\/span>Bore<\/span><\/div>\n
3,967 KN<\/span>Thrust<\/span><\/div>\n
\u2264700mm<\/span>Stroke<\/span><\/div>\n
\u00d72<\/span>Per Machine<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n
\n

A Completely Different Job \u2014 Track Tension, Not Digging Force<\/span><\/h2>\n

\"Track<\/p>\n

\n \"Large<\/p>\n

The bucket (#6), boom (#7), and stick (#8) cylinders are all part of the excavator’s arm \u2014 they dig, lift, and load. The tightening cylinder has nothing to do with digging. It sits inside the track frame (one per track, two per machine), pushing the front idler wheel forward along a slide rail to tension the track chain.<\/p>\n<\/div>\n

A crawler excavator’s track chain is a continuous loop of forged steel links \u2014 30\u201350 tonnes of chain per side on a 100-tonne machine. The track wraps around the drive sprocket (at the rear), the front idler (at the front), and 5\u20138 carrier rollers (on top) and 7\u201312 track rollers (underneath). The tightening cylinder pushes the front idler outward, stretching the chain to the correct tension. A grease-charged accumulator behind the cylinder maintains this tension as the track chain wears and lengthens over time.<\/p>\n

Korea Ever-Power manufactures the tightening cylinder as the fourth and final cylinder in the large excavator hydraulic cylinder<\/a> family \u2014 completing the full machine system from arm tip to undercarriage.<\/p>\n

<\/div>\n<\/section>\n
\n

Technical Specifications<\/span><\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nLarge Excavator Tightening Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nControl the action of track tension<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n280 mm \u2013 380 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n170 mm \u2013 300 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 700 mm<\/td>\n<\/tr>\n
Max Thrust<\/td>\n3,967.4 KN (bore 380 mm \/ 35 MPa)<\/td>\n<\/tr>\n
Application<\/td>\nLarge Excavator (track undercarriage)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n
\n
\n

Too Loose vs Too Tight \u2014 Why Correct Track Tension Is the Most Expensive Maintenance Decision<\/h2>\n
\n
\n Too loose \u2014 derailment and accelerated wear<\/strong><\/p>\n

A slack track sags between the idler and the first roller, flaps during travel, and can jump off the sprocket during sharp turns \u2014 derailing the track. A derailed track immobilises the excavator until a maintenance crew re-tracks it (1\u20134 hours of lost production). Even without derailment, a loose track allows the links to hammer against the rollers \u2014 accelerating roller bearing wear and chain pin wear by 30\u201360%.<\/p>\n<\/p><\/div>\n

\n Too tight \u2014 premature bearing and bushing failure<\/strong><\/p>\n

An over-tensioned track presses the chain pins into the roller bushings with excessive force \u2014 accelerating bushing wear and increasing the power consumed by undercarriage friction (reducing fuel efficiency by 3\u20138%). The idler bearings, carrier roller bearings, and track roller seals all suffer from the higher contact forces. Over-tension shortens undercarriage component life by 20\u201340%. Contact Korea Ever-Power<\/a> for tightening cylinder specifications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

\n \"Track
\n<\/section>\n
\n

Manufacturing Process<\/span><\/h2>\n

The tightening cylinder bore (280\u2013380 mm) is honed to Ra 0.2\u20130.4 \u00b5m. Unlike the digging cylinders which cycle rapidly, the tightening cylinder moves infrequently (only during tension adjustment) but must hold its position under extreme static load for months. The grease accumulator behind the piston maintains the tensioning force as the track chain elongates with wear \u2014 the cylinder compensates automatically without operator intervention.<\/p>\n

Chrome plating 80 \u00b5m (the cylinder lives inside the track frame, exposed to the most abrasive undercarriage environment: packed mud, rock debris, and continuous vibration). Seals rated -40 \u00b0C to +100 \u00b0C. Hydrostatic tested at 52.5 MPa. Position-hold tested under full track tension force for a defined static period to verify zero drift.<\/p>\n<\/section>\n

\n

OEM & ODM<\/span><\/h2>\n
\n
\n
What You Provide<\/strong><\/div>\n
\n

Excavator model and weight class, track chain pitch and link count, required tensioning force, idler slide travel, grease accumulator volume, bore\/rod\/stroke, system pressure (grease or oil), temperature range, and the track frame assembly drawing.<\/p>\n<\/div>\n<\/div>\n

\n
What the Factory Delivers<\/strong><\/div>\n
\n

Matched pair with engineering drawing, bore, rod, stroke, grease accumulator provisions, 80 \u00b5m chrome, -40\/+100 \u00b0C seal specification, and mounting dimensions. Hydrostatic + position-hold test. Seal kits. Browse the mobile machinery hydraulic cylinder family<\/a> and the Korea Ever-Power catalogue<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"Workshop\"<\/section>\n

\n

FAQ<\/span><\/h2>\n
\n
\n

Why is the bore so large (380 mm) for a cylinder that barely moves?<\/h3>\n

Because the track chain on a 100-tonne excavator weighs 30\u201350 tonnes per side. Tensioning this chain \u2014 stretching forged steel links against their own friction and weight \u2014 requires enormous force. The 380 mm bore at 35 MPa produces nearly 4,000 KN \u2014 the force needed to push the front idler forward and stretch the chain to the correct sag measurement.<\/p>\n<\/div>\n

\n

How does the grease accumulator maintain tension automatically?<\/h3>\n

As the track chain wears, the links elongate slightly \u2014 loosening the track. The grease accumulator (a reservoir of compressed grease behind the tightening cylinder piston) releases grease into the cylinder, extending it by a fraction of a millimetre to compensate for the chain elongation. This maintains constant tension without manual adjustment between service intervals.<\/p>\n<\/div>\n

\n

Can Korea Ever-Power supply all 4 large excavator cylinders as a set?<\/h3>\n

Yes \u2014 bucket (#6), boom (#7, matched pair), stick (#8), and tightening (#9, matched pair) cylinders are available as a complete system for large excavator OEMs. All share the 35 MPa pressure rating, 80 \u00b5m chrome, and forged rod eyes. Browse telescopic cylinders<\/a> and industrial engineering cylinders<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\n

Related Categories<\/span><\/h2>\n
<\/p>\n
\n
\"Telescopic\"<\/div>\n
\n
Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, hoist.<\/div>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

\n
\"Forklift\"<\/div>\n
\n
Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 OEM.<\/div>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

\n
\"AWV\"<\/div>\n
\n
Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, platforms.<\/div>\n<\/div>\n<\/div>\n

<\/a><\/div>\n<\/section>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Large excavator tightening cylinder \u2014 the hydraulic actuator that adjusts and maintains track chain tension on 20\u2013100+ tonne crawler excavators. Not a digging cylinder \u2014 this is an undercarriage maintenance component that pushes the front idler wheel forward to tension the track chain. Bore 280\u2013380 mm, stroke \u2264700 mm, thrust 3,967.4 KN at 35 MPa. Correct track tension affects traction, steering, track service life, and undercarriage component wear. Too loose: the track derails. Too tight: rollers and idler bearings wear prematurely. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2556,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[854],"product_tag":[],"class_list":["post-2555","product","type-product","status-publish","has-post-thumbnail","product_cat-mobile-machinery-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/product\/2555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/comments?post=2555"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/media\/2556"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/media?parent=2555"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/product_brand?post=2555"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/product_cat?post=2555"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/nl\/wp-json\/wp\/v2\/product_tag?post=2555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}