6521 Hydraulic Service Crane

6,000-lb Capacity with 21′ of Reach

Give productivity a lift with the Stellar® 6521 Hydraulic Truck Crane. The rugged construction and high strength help construction companies, rental companies, agriculture operations, mining companies, public utilities and more get the job done day after day.

2 available in Inventory


Additional Information

  • Selection. Available in electric and hydraulic models.
  • Proportional Radio Remote. Can be operated with the handheld CDT™ Radio Remote Control System, which includes a capacity alert communication system and a safe mode function. The crane control system gives operators precision control while allowing them to stand in the best possible position to achieve their job efficiently.
  • Planetary Winch. Featuring a hydraulic or mechanical brake system, it lifts the maximum crane load and offers the smoothest and fastest speeds in the market today for maximum productivity.
  • Superior Boom Articulation. Stellar Hydraulic Cranes make loading easier with industry-leading -10 degrees to +80 degrees articulation.
  • Full Hydraulic Extension. No manual extension is required for hydraulic models. A configuration with one hydraulic and one manual boom is standard, and an optional boom configuration of two hydraulic boom extensions is available.
  • Internal Extension Cylinder. Delivers the same extension boom performance as our larger cranes.
  • Quick-Release Snatch Block Stow. Easily stow your snatch block on the underside of the boom after use. The unique design gently releases the snatch block for use when the boom is raised at close to 60 degrees to ensure a safe and orderly deployment.
  • Strong Rotation System. The cast iron base and internal mechanical stop provide the most durable rotation system found in the industry.
  • Counterbalance Valves. Included on each cylinder to prevent unintended cylinder movement should a hose break.
  • Greaseable Pivot Bushings. Each pivot pin location includes bushings and grease zerks to simplify maintenance and help ensure years of use.
  • Innovative Boom Design. Stellar’s boom design delivers a stronger and better-aligning boom than the square booms of other brands.
  • Bar-Style Anti-Two Block. The low-profile, bar-style anti-two block system allows for easy access to the tightest lifting locations.
  • Certified. Meets ANSI B30.5 and OSHA 1910.180 specifications.


Crane Rating (with Boost)*: 35,000 ft-lb (5.3 tm)
Standard Boom Length: 11' (3.35 m) from CL of crane
Boom Extension:
• 1st Stage:
• 2nd Stage:

Hydraulic 60" (152.4 cm)
Manual 60" (optional)
Maximum Horizontal Reach: 21' (6.4 m) from CL of crane
Maximum Vertical Lift: 22' 11" (6.99 m) from crane base
Lifting Capacity**: 6,000 lbs @ 5' 10" (2,722 kg @ 1.78 m)
1,705 lbs @ 21' (770 kg @ 6.4 m)
Boom Elevation: -10° to +80°
Stowed Height (crane only): 33" (83.8 cm)
Mounting Space Required: 20" x 21" (50.8 x 53.3 cm)
Approximate Crane Weight: 2H: 1,390 lbs (631 kg)
1H1M: 1,275 lbs (578 kg)
1H1M: 1,365 lbs (630 kg)
• Rope Diameter:
• Line pull speed:
• Max. single part line:
• Max. double part line:

5/16" (0.794 cm)
70 ft/min (21.34 m/min)
3,000 lbs (1,363 kg)
6,000 lbs (2,727 kg)
Rotation: 400° power (worm gear)
Power Supply Required: 12V Power Unit: 2 gpm @ 3,000 psi (7.6 lpm @ 207 bar)
PTO & Pump 8 gpm @ 3,000 psi (30.31 lpm @ 207 bars)
Min. Rec. Chassis (GVRW): 16,000
*Crane rating in Boost Mode. Normal crane rating is 30,000 ft-lbs (4.15TM).
**Maximum capacities in Boost Mode.

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