Hydraulic Rotary Actuators – E3

The E3 is Eckart’s compact hydraulic rotary actuator for mobile and off-highway applications. It provides 3,540 to 31,862 in-lb of torque across five piston sizes at operating pressures up to 210 bar, with standard rotation in 180° or 360°. Every E3 comes with a flange shaft and through-hole as standard, allowing hoses, cables, or safety pins to pass through the actuator.

While the E3 is dimensionally interchangeable with competing actuators, three design choices set it apart: virtually backlash-free spline threads, zero play in the four-point roller bearing, and the elimination of compact seals that take stress on both sides. The result is a steady, wobble-free working platform even under lateral load.

Technical Data

Standard Technical Data

Min. Operating Pressure Required	145 to 217 psi (10 to 15 bar)
Max. Allowable Operating Pressure	3,045 psi (210 bar)
Temperature Range	-13ºF to 158ºF (-25ºC to 70ºC)

Technical Data for Actuators Size 70-170

Size (Piston-Ø, in mm)	70	95	125	150	170
Max Torque at 3,045 psi (210 bar) lbf-in | [Nm]	3540 [400]	6372 [720]	11063 [1250]	22126 [2500]	31862 [3600]
Spec Torque lbf-in/psi | [Nm/bar]	1.16 [1.90]	2.09 [3.43]	3.63 [5.95]	7.26 [11.90]	10.46 [17.14]
Angle of Rotation (+4º tolerance)	180º / 360º	180º / 360º	180º / 360º	180º / 360º	180º / 270º
Absorption Volume / Displacement in^3/1º | [cm^3/1º]	0.032 [0.518]	0.057 [0.932]	0.120 [1.962]	0.206 [3.371]	0.306 [5.012]
Weight ca. 180º lbs | [kg]	21.2 [9.6]	31.7 [14.4]	59.7 [27.1]	94.1 [42.7]	143.3 [65.0]
Weight ca. 360º lbs | [kg]	27.6 [125]	42.3 [19.2]	81.6 [127.2]	127.2 [57.7]	(270º) 168.9 [76.6 ]
Max. Radial Load FR lbf | [KN]	1798 [8.00]	4046 [18.00]	8093 [36.00]	9891 [44.00]	13038 [58.00]
Max. Axial Load Fax1 lbf | [KN]	1798 [8.00]	4046 [18.00]	8093 [36.00]	10341 [46.00]	13038 [58.00]
Max. Axial Load Fax2 lbf | [KN]	179.9 [0.80]	427.1 [1.90]	831.8 [3.70]	966.7 [4.30]	1326.4 [5.90]
Max. Moment Capacity M	8850 [1000]	22126 [2500]	50449 [5700]	75231 [8500]	106209 [12000]

Dimension Data for Actuators Size 70-170

Size (Piston-Ø, in mm)	70	95	125	150	170
Outer Diameter (Ø A)	4.13 [105]	5.31 [135]	6.69 [170]	7.76 [197]	9.06 [230]
Shaft Through Hole (Ø E)	0.51 [13]	0.75 [19]	1.38 [35]	1.81 [46]	2.50 [63.5]
Length (K at 180º)	6.63 [168.4]	6.10 [155]	7.44 [189]	8.82 [224]	10.04 [255]
Length (K at 360º)	9.87 [227.8]	8.39 [213]	10.55 [268]	12.44 [316]	(270º) 12.10 [307.4]

Helical Spline Hydraulic Rotary Actuators:

Our rotary actuators are the helical spline design. This means, a piston and a helix, or sliding spline, work together to convert the linear motion of the piston into rotational motion. Composed of two moving parts and some form of housing, the sliding helical splined gear concept within the actuator is used in many applications where a rotary movement is required. Helical Spline Actuators function when the piston is axially displaced using hydraulic pressure causing simultaneous rotation of the piston. Standard amounts of rotation are 90°, 180°, and 360°; but are available generally up to 720° or more. Additional rotation is created by making the spline gears longer while maintaining the same diameter. The primary benefit to this type of product compared to alternative designs such as linkages using hydraulic cylinders (linear actuators) is its compact design.

Hydraulic Rotary Actuator Standard Features:

Hydraulic Rotary Actuator Optional Features:

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.