{"id":2547,"date":"2026-07-01T06:03:16","date_gmt":"2026-07-01T06:03:16","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/small-excavator-rotary-actuator\/"},"modified":"2026-07-01T06:03:20","modified_gmt":"2026-07-01T06:03:20","slug":"small-excavator-rotary-actuator","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/el\/product\/small-excavator-rotary-actuator\/","title":{"rendered":"Small Excavator Rotary Actuator"},"content":{"rendered":"

<\/p>\n
\n \"Small<\/p>\n
\n Small Excavator \u00b7 5th of 5 \u00b7 Final<\/span><\/p>\n

Small Excavator Rotary Actuator<\/h2>\n

The sideways mover. Every other excavator cylinder works in the vertical plane \u2014 up\/down, in\/out. The rotary actuator swings the boom left or right, letting the operator dig alongside a wall without repositioning the entire machine. A capability that turns a 3-point-turn into a straight pass.<\/p>\n

\n
50\u2013120mm<\/span>Bore<\/span><\/div>\n
333 KN<\/span>Max Thrust<\/span><\/div>\n
\u22641,000mm<\/span>Stroke<\/span><\/div>\n
Left \u2194 Right<\/span>Lateral Swing<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n
\n

Boom Offset \u2014 The Feature That Defines a Small Excavator<\/span><\/h2>\n

\"Boom<\/p>\n

\n \"Small<\/p>\n

On a standard excavator, the boom is fixed on the machine’s centreline \u2014 the bucket can only dig directly in front of the machine. To trench alongside a wall, the operator must angle the entire machine at 45\u00b0 to the wall, dig at an offset, reposition, and repeat. This is slow, imprecise, and requires extra working space.<\/p>\n<\/div>\n

Small excavators solve this with boom offset: the rotary actuator swings the boom foot-pivot 30\u201360\u00b0 left or right of the centreline, allowing the bucket to dig along a line parallel to the machine \u2014 but offset sideways. The operator can trench directly alongside a wall, fence, or building foundation while the tracks remain parallel to the trench. One straight pass replaces multiple angled repositions.<\/p>\n

This capability is almost universal on small excavators (1\u20136 tonnes) and is the primary reason residential and urban contractors choose mini excavators over larger machines. Korea Ever-Power manufactures the rotary actuator as the fifth and final cylinder in the small excavator hydraulic cylinder<\/a> family.<\/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>\nSmall Excavator Rotary Actuator<\/td>\n<\/tr>\n
Function<\/td>\nDeflection (left\/right swing) of the boom assembly<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n50 mm \u2013 120 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n25 mm \u2013 75 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 1,000 mm<\/td>\n<\/tr>\n
Max Thrust<\/td>\n333 KN (bore 120 mm \/ 29.4 MPa)<\/td>\n<\/tr>\n
Application<\/td>\nSmall Excavator (1\u201310 tonne, boom offset)<\/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

Lateral Force During Digging \u2014 The Side Load Every Other Cylinder Avoids<\/h2>\n

When the boom is offset to one side and the excavator digs, the digging reaction force has a lateral component \u2014 a sideways push that tries to swing the boom back toward the centreline. The rotary actuator must resist this lateral digging force while holding the offset angle steady. This is unlike the boom, stick, and bucket cylinders, which only experience loads in their own plane of motion.<\/p>\n

\n
\n Position holding \u2014 resisting digging side-force<\/strong><\/p>\n

The actuator must hold the boom at the set offset angle against the continuous lateral push from digging. A weak or drifting actuator allows the boom to swing inward during each dig stroke \u2014 the trench wanders away from the wall, defeating the purpose of boom offset. The cylinder’s internal leakage specification is critical for position-hold accuracy.<\/p>\n<\/p><\/div>\n

\n Swing motion \u2014 repositioning between digs<\/strong><\/p>\n

Between digging cycles, the operator may swing the boom left or right to reposition the bucket. This motion requires smooth, proportional control \u2014 jerky swing makes precision trenching impossible. Korea Ever-Power specifies low-friction seals for smooth breakaway and proportional flow response across the full stroke. Contact the Korea Ever-Power engineering team<\/a> for rotary actuator specifications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

\n \"Excavator
\n<\/section>\n
\n

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

Bore honed to Ra 0.2\u20130.4 \u00b5m. Chrome plating 50\u201380 \u00b5m. The rotary actuator mounts horizontally at the base of the boom \u2014 a partially shielded position with moderate exposure to soil and water. The mounting lugs are forged to handle the combination of axial thrust (swing force) and lateral bending (digging side-force) that the rotary actuator uniquely experiences. Seals rated -30 \u00b0C to +80 \u00b0C, polyurethane + NBR + standard double-lip wiper.<\/p>\n

Every rotary actuator is hydrostatic tested at 1.5\u00d7 rated pressure (44.1 MPa) and position-hold tested \u2014 verifying that the boom holds its offset angle under simulated lateral digging force without measurable drift over a defined period.<\/p>\n<\/section>\n

\n

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

Excavator model and weight class, boom offset range (degrees left\/right), required swing torque, lateral digging force specification, bore\/rod\/stroke, system pressure, position-hold drift limit, pin diameters, and the boom offset linkage assembly drawing.<\/p>\n<\/div>\n<\/div>\n

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

Engineering drawing with bore, rod, stroke, forged mounting lugs, low-friction seal specification, chrome plating detail, and mounting dimensions. Hydrostatic + position-hold test certificate. Seal kits. Browse the mobile machinery hydraulic cylinder family<\/a> and the Korea Ever-Power catalogue<\/a>.<\/p>\n<\/div>\n<\/div><\/div>\n

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

\n

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

Is the rotary actuator a rotary-vane type?<\/h3>\n

No \u2014 despite the name “rotary actuator,” this is a conventional linear hydraulic cylinder connected to the boom offset linkage. The cylinder’s linear stroke is converted to rotational (swing) motion through the linkage geometry. Rotary-vane actuators are used on some excavator models for cab rotation, but the boom offset function uses a standard linear cylinder.<\/p>\n<\/div>\n

\n

Do large excavators have boom offset?<\/h3>\n

Rarely. Boom offset is primarily a small excavator feature (1\u201310 tonnes). Large excavators (20+ tonnes) use their greater reach and wider swing to work around obstructions. The additional weight and complexity of an offset mechanism is less justified on a large machine that already has sufficient reach for most applications.<\/p>\n<\/div>\n

\n

Can Korea Ever-Power supply all 5 small excavator cylinders as a set?<\/h3>\n

Yes \u2014 bucket (#1), stick (#2), boom (#3), bulldozing (#4), and rotary actuator (#5) are available as a complete 5-cylinder matched set for the same excavator model, ensuring pressure compatibility, seal standardisation, and coordinated delivery. Browse telescopic cylinders<\/a> and forklift cylinders<\/a>.<\/p>\n<\/div><\/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":"

Small excavator rotary actuator \u2014 the hydraulic cylinder that swings the boom assembly left or right relative to the machine centreline (boom offset). The only cylinder in the small excavator family that produces lateral motion: all others (bucket, stick, boom, blade) work in the vertical plane. Boom offset allows the excavator to dig a trench directly alongside a wall, fence, or building without positioning the machine parallel to the obstruction. Bore 50\u2013120 mm, stroke \u22641,000 mm, thrust 333 KN at 29.4 MPa. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2548,"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-2547","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\/el\/wp-json\/wp\/v2\/product\/2547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/comments?post=2547"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/media\/2548"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/media?parent=2547"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_brand?post=2547"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_cat?post=2547"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_tag?post=2547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}