Main content

Caterpillar

621 Wheel Tractor-Scraper

Flywheel Power – Tractor/Scraper

304 kW (407 hp)

304 kW (407 hp)

Scraper Capacity – Heaped

24 yd³

18.4 m³

Top Speed – Loaded

33.5 mile/h

53.9 km/h

Overview

Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Cat Wheel Tractor-Scrapers to consistently deliver high productivity at the lowest cost per ton.

Media

Photos

Videos

360° View

Exterior

360° Exterior view. Double click on the image to zoom in on any area of the product.

Interior

360° interior view. Double click on the image to zoom in on any area of the product.

Details

Specifications

Spec Value
Overall Shipping Height 13.22 ft 4.03 m
Overall Width 11.75 ft 3.58 m
Scraper Capacity – Heaped 24 yd³ 18.4 m³
Fuel Tank Refill Capacity – Scraper 216.1 gal (US) 818 l
Tires – Scraper 33.25R29**E3 33.25R29**E3
Width – Cut 10.3 ft 3.14 m
Maximum Depth of Spread 21.3 in 540 mm
Top Speed – Loaded 33.5 mile/h 53.9 km/h
Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
180° Curb-to-Curb Turning Width 38.71 ft 11.8 m
Scraper Capacity – Struck 17.1 yd³ 13 m³
Maximum Depth of Cut 12.4 in 315 mm
Tires – Tractor Drive 33.25R29**E3 33.25R29**E3
Spec Value
Engine Model – Tractor Cat C13 Cat C13
Flywheel Power – Tractor 407 HP 304 kW
Note Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards. Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Rated Engine RPM – Tractor 2000 r/min 2000 r/min
Spec Value
Flywheel Power – Tractor/Scraper 304 kW (407 hp) 304 kW (407 hp)
Spec Value
Scraper Capacity – Heaped 24 yd³ 18.4 m³
Spec Value
Top Speed – Loaded 33.5 mile/h 53.9 km/h
Spec Value
Hydraulic System 21.926 gal (US) 83 l
Crankcase 8.08 gal (US) 30.58 l
Transmission System 24.76 gal (US) 93 l
Cooling System 11.89 gal (US) 45 l
Fuel Tank 216.09 gal (US) 818 l
Diesel Exhaust Fluid 8.057 gal (US) 30.5 l
Spec Value
Width – Overall Machine 141.1 in 3585 mm
Width – Tractor 133.1 in 3381 mm
Width – Inside of Bowl 120 in 3048 mm
Width – Outside Rear Tires 128.9 in 3275 mm
Height – Overall Shipping 158.6 in 4029 mm
Height – Top of Cab 142.2 in 3612 mm
Ground Clearance – Tractor 21.9 in 557 mm
Front of Tractor to Front Axle 122.8 in 3119 mm
Axle to Vertical Hitch Pin 21.3 in 540 mm
Height – Scraper Blade Maximum 20.5 in 520 mm
Wheel Base 314.9 in 7998 mm
Rear Axle – Rear of Machine 114.1 in 2898 mm
Length – Overall Machine – Standard 551.8 in 14015 mm
Length – Maximum (Push-Pull) 613.2 in 15576 mm
Width – Overall Machine – Ladder Down 149.2 in 3790 mm
Width – Rear Tire Centers 90.2 in 2290 mm
Spec Value
Operating Weight – Empty 79787 lb 36185 kg
Overall Length 45.9 ft 14.02 m
Spec Value
Overall Length – With Bail Down 51.1 ft 15.58 m
Operating Weight – Empty 80630 lb 36567 kg
Spec Value
Exterior Sound Level The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A).
ROPS/FOPS Meets SAE and ISO standards Meets SAE and ISO standards
Spec Value
Rollover Protection Structure (ROPS) ISO 3471:2008 for up to 17 084 kg (37,664 lb) ISO 3471:2008 for up to 17 084 kg (37,664 lb)
Brakes ISO 3450:1996 ISO 3450:1996
Reverse Alarm ISO 9533:2010 ISO 9533:2010
Falling Object Protective Structure (FOPS) ISO 3449:2005 Level II ISO 3449:2005 Level II
Seat Belt SAE J386:JUN1985 SAE J386:JUN1985
Steering System ISO 5010:2007 ISO 5010:2007
Spec Value
Transmission Gear – Seventh 24.8 mile/h 39.9 km/h
Transmission Gear – Fifth 13.6 mile/h 21.9 km/h
Transmission Gear – First 3.1 mile/h 5 km/h
Transmission Gear – Sixth 18.4 mile/h 29.6 km/h
Transmission Gear – Second 5.5 mile/h 8.9 km/h
Transmission Gear – Third 7.5 mile/h 12.1 km/h
Transmission Gear – Fourth 10.1 mile/h 16.3 km/h
Transmission Gear – Eighth 33.5 mile/h 53.9 km/h
Transmission Gear – Reverse 5.7 mile/h 9.2 km/h
Spec Value
Apron Raise 2.95 s 2.95 s
Bowl Raise 3 s 3 s
Ejector Retract 6.7 s 6.7 s
Bowl Lower 3.5 s 3.5 s
Apron Lower 3.8 s 3.8 s
Ejector Extend 5.2 s 5.2 s
Bail Lower 3.2 s 3.2 s
Bail Raise 1.8 s 1.8 s

Standard Equipment

NOTE

  • Standard and optional equipment may vary. Consult your Cat dealer for details.

POWER TRAIN - TRACTOR

  • Cat C13 engine with MEUI™
  • Cat engine brake
  • Electric start, 24 Volt
  • Air cleaner, dry type with precleaner
  • Fan, hydraulic
  • Ground level engine shutdown
  • Radiator, aluminum unit core, 9 fins per inch
  • Guard, crankcase
  • Muffler (only for less or non-regulated regions engine arrangement only)
  • Starting aid, ether
  • Braking system: – Primary and secondary, wet disc, hydraulic – Parking, hydraulic-released, spring-applied – Throttle lock
  • Transmission: – 8-speed planetary power shift – ECPC control – APECS software – Programmable top gear selection – Transmission hold – Differential lock – Guard, power train – Standard tire spin reduction – Ground speed control – Machine speed limit – Differential lock protection

POWER TRAIN - SCRAPER

  • Braking system: – Primary and secondary, wet disc, hydraulic

ELECTRICAL - TRACTOR

  • Alternator, 150 Amp
  • Batteries (4), 12V, 1,000 CCA, maintenance free, high output
  • Electrical system, 24V
  • Lighting system: – Headlights, halogen – Turn signals with hazard function, LED floodlights, (2) cutting edge (1) bowl, halogen side vision (2)
  • Starting/charging receptacle

ELECTRICAL - SCRAPER

  • Alarm, backup
  • Lighting system: – Brake lights, LED – Turn signals with hazard function, LED

OPERATOR ENVIRONMENT - TRACTOR

  • HVAC system, heat, AC, defrost
  • Thermostat control of HVAC system
  • Coat hook
  • Lunchbox platform with holding strap
  • Diagnostic connection (2)
  • 12V power ports (2)
  • Differential lock (1)
  • Dome courtesy light
  • Horn, electric
  • T-Handle implement control
  • Mirror, rearview
  • Radio ready
  • ROPS/FOPS cab, pressurized
  • Keypad switches: – Throttle lock – Wipers/washers – Hazard lights – Retarding level select – Work lights on, off – Information mode on Messenger Display
  • Safety tab rocker switches
  • Seat belt, static two-piece
  • Seat, Cat Advanced Ride Management (ARM), Cat Comfort Series 3, rotates 30 degrees
  • Steering wheel, tilt, telescoping, padded
  • Windows, right side emergency egress
  • Windows, sliding
  • Windows, laminated, zipped in
  • Windshield wipers, front and rear windows, includes washers
  • Door lock
  • Messenger Display
  • Gauges, warnings include: – Coolant temperature – Engine oil temperature – Hydraulic oil temperature – DPF temperature – Fuel level – Park brake – Implement lockout – Brake system – Regeneration required – Throttle lock – System voltage – Secondary steering – Bail down – Ejector auto – Differential lock – Apron float – Transmission hold – Cushion hitch – High beam lights – Action lamp – Engine speed, rpm – Gear selection – DEF fill levels

FLUIDS

  • Extended Life Coolant to -37° C (-34° F)

OTHER STANDARD EQUIPMENT - TRACTOR

  • Advanced cushion hitch
  • Accumulators (cushion hitch) with Canadian Registration Number (CRN)
  • Fast oil change
  • Fenders, non-metallic
  • Heater, engine coolant 120V
  • Rims (2)
  • Tow pin, front
  • Vandalism locks
  • Heater, engine coolant 120V

OTHER STANDARD EQUIPMENT - SCRAPER

  • Bowl: – 18.4 m3 (24 yd3), heaped – 14.1 m3 (18.4 yd3), struck
  • Vandalism locks
  • Hydraulic position sensing cylinders (bowl lift and apron)

Optional Equipment

NOTE

  • Standard and optional equipment may vary. Consult your Cat dealer for details.

STEERING ARRANGEMENTS

  • Secondary Steering Arrangement

INTEGRATED TECHNOLOGIES

  • Sequence Assist Arrangement
  • Load Assist
  • Cat Grade Control with Load Assist

WORK LIGHT ATTACHMENTS

  • HID work lights

AMBIENT CAPABILITY ARRANGEMENTS

  • Cooling, high ambient HRC
  • Cooling, low ambient HRC
  • Cooling, high ambient LRC
  • Cooling, low ambient LRC

OTHER ATTACHMENTS

  • Camera arrangement – WAVS
  • Steering lock – external
  • Cab beacon
  • Air horn
  • Air horn and beacon
  • Fender, scraper
  • Guard, overflow
  • Wiring group
  • Year of manufacture plate

SERVICE INSTRUCTIONS

  • Film arrangement – U.S. (ANSI)
  • Film arrangement – International (ISO)

Sign up for Riggs Cat Emails

  • This field is for validation purposes and should be left unchanged.