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LK Series Torsional Coupling

The LK Series coupling is a simple two-piece design consisting of an element and hub. The couplings are designed to be used with engine driven, flange mounted, hydraulic pump systems. The couplings are “torsionally stiff” enabling hydraulic pumps and similar equipment with low mass or inertia to operate below critical speeds. The “torsionally stiff” LK Series coupling raises the critical speed above the operating range providing a system free of harmful torsional vibrations. The LK Series is ideal for hydrostatic drives on construction equipment, cranes, forklifts, excavators, vibratory rollers, tractors, etc. Virtually all engine driven hydraulic systems in the low to mid power range can use the LK Series coupling.

  • Simple two-piece design for low-mid power diesel driven hydraulic systems
  • Composed of flywheel mounted element & star shaped hub
  • Available in Zytel®
  • Nominal torque: up to 21,240 in-lb (2400 Nm)
LK Series Torsional Coupling

Resources

Torsional Couplings Digital Catalog

Torsional Couplings Catalog (pdf)

L-LOC Clamp Feature Sheet (pdf)

Torsionskupplungen (German catalog)

Installation Instructions & Videos

LK Series Torsional Coupling Additional Resources

Element Features:

  • Fiberglass reinforced polyamide construction
  • Impact and oil resistant
  • –40° to 320° F temperature range
  • SAE J620 flywheel sizes 6.5 through 14 and varies metric sizes
  • Universal element can be mounted to and adapter plate
  • Blind assembly, no lubrication

Hub Features

  • High quality powdered-metal construction
  • Splined hubs available with L-LOC clamping system
  • Engagement “dogs” are slightly crowned to avoid edge pressure when slight misalignment occurs
  • Available in bore with keyway and spline connections

Typical Applications

Applications where a hydraulic pump is directly connected to the engine such as wheel loaders, hydraulic excavators, vibration rollers, fork lift trucks, concrete cutters, compact loaders, asphalt finishers and mobile cranes.

 

SAE

Nominal

Maximum

Max

Dynamic Torsional Stiffness

Relative

 

Flywheel

Torque

Torque

Speed

0.25TKN

0.50TKN

0.75TKN

1.00TKN

Damping

Size

Size

In-lbs

Nm

in-lb

Nm

RPM

in-lb/rad

Nm

in-lb/rad

Nm

in-lb/rad

Nm

in-lbs/rad

Nm

Ψ

LK80

–

1,080

125

2,880

330

6,000

Consult Lovejoy

 0.4

LK100

6.5, 7.5, 8, 10

3,540

400

7,080

800

5,000

490

55

550

62

800

90

1,060

120

0.4

LK125

10, 11.5

7,080

800

14,160

1600

4,500

1,370

155

1,590

180

2,800

315

4,070

460

0.4

LK150

11.5, 14

10,620

1200

26,400

3000

4,000

2,300

260

2,480

280

3,700

420

7,950

900

 0.4

LK150D

14

21,240

2400

58,200

6000

4,000

4,600

520

4,960

560

7,400

840

15,900

1800

 0.4

Please download the Lovejoy Torsional Coupling Catalog for dimensional data.

For other Torsional Couplings: see Torsional Couplings
Or, for other coupling types: see Coupling Preselection Guide