621 Wheel Tractor-Scraper

Our wheel tractor-scrapers have long been considered the basic method of moving volumes of material, and the Cat® 621 Wheel Tractor-Scraper is no exception. Known for its ability to be push-loaded and high travel speeds, it’s always an earthmover’s first tool of choice when working in challenging load areas. With an open bowl and a single engine, this machine is designed to handle a wide range of material types ranging from sand to ripped rock 609.6 mm (24 “) or less in size.

  • BE MORE PRODUCTIVE
  • WORK IN COMFORT
  • DESIGNED FOR SAFETY
  • EASY TO OPERATE
  • INTEGRATED CAT TECHNOLOGIES
  • EXECUTE EFFICIENCY
General
Overall Shipping Height 4.03 m (13.22 ft)
Overall Width 3.58 m (11.75 ft)
Scraper Capacity - Heaped 18.4 mu00b3 (24 ydu00b3)
Fuel Tank Refill Capacity - Scraper 818 l (216.1 gal (US))
Tires - Scraper 33.25R29**E3
Width - Cut 3.14 m (10.3 ft)
Maximum Depth of Spread 540 mm (21.3 in)
Top Speed - Loaded 53.9 km/h (33.5 mile/h)
Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
180u00b0 Curb-to-Curb Turning Width 11.8 m (38.71 ft)
Scraper Capacity - Struck 13 mu00b3 (17.1 ydu00b3)
Maximum Depth of Cut 315 mm (12.4 in)
Tires - Tractor Drive 33.25R29**E3
Engine
Engine Model - Tractor Cat C13
Flywheel Power - Tractor 304 kW (407 hp)
Note 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)
Tractor Engine
Flywheel Power - Tractor/Scraper 304 kW (407 hp)
Scraper Bowl
Scraper Capacity - Heaped 18.4 mu00b3 (24 ydu00b3)
Transmission
Top Speed - Loaded 53.9 km/h (33.5 mile/h)
Service Refill Capacities
Hydraulic System 83 l (21.926 gal (US))
Crankcase 30.58 l (8.08 gal (US))
Transmission System 93 l (24.76 gal (US))
Cooling System 45 l (11.89 gal (US))
Fuel Tank 818 l (216.09 gal (US))
Diesel Exhaust Fluid 30.5 l (8.057 gal (US))
Dimensions
Width - Overall Machine 3585 mm (141.1 in)
Width - Tractor 3381 mm (133.1 in)
Width - Inside of Bowl 3048 mm (120 in)
Width - Outside Rear Tires 3275 mm (128.9 in)
Height - Overall Shipping 4029 mm (158.6 in)
Height - Top of Cab 3612 mm (142.2 in)
Ground Clearance - Tractor 557 mm (21.9 in)
Front of Tractor to Front Axle 3119 mm (122.8 in)
Axle to Vertical Hitch Pin 540 mm (21.3 in)
Height - Scraper Blade Maximum 520 mm (20.5 in)
Wheel Base 7998 mm (314.9 in)
Rear Axle - Rear of Machine 2898 mm (114.1 in)
Length - Overall Machine - Standard 14015 mm (551.8 in)
Length - Maximum (Push-Pull) 15576 mm (613.2 in)
Width - Overall Machine - Ladder Down 3790 mm (149.2 in)
Width - Rear Tire Centers 2290 mm (90.2 in)
Non Push-Pull
Operating Weight - Empty 36185 kg (79787 lb)
Overall Length 14.02 m (45.9 ft)
Push-Pull
Overall Length - With Bail Down 15.58 m (51.1 ft)
Operating Weight - Empty 36567 kg (80630 lb)
Cab
Exterior Sound Level The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A).
ROPS/FOPS Meets SAE and ISO standards
Safety Criteria Compliance Standards
Rollover Protection Structure (ROPS) ISO 3471:2008 for up to 17 084 kg (37,664 lb)
Brakes ISO 3450:1996
Reverse Alarm ISO 9533:2010
Falling Object Protective Structure (FOPS) ISO 3449:2005 Level II
Seat Belt SAE J386:JUN1985
Steering System ISO 5010:2007
Travel Speeds - Runout
Transmission Gear - Seventh 39.9 km/h (24.8 mile/h)
Transmission Gear - Fifth 21.9 km/h (13.6 mile/h)
Transmission Gear - First 5 km/h (3.1 mile/h)
Transmission Gear - Sixth 29.6 km/h (18.4 mile/h)
Transmission Gear - Second 8.9 km/h (5.5 mile/h)
Transmission Gear - Third 12.1 km/h (7.5 mile/h)
Transmission Gear - Fourth 16.3 km/h (10.1 mile/h)
Transmission Gear - Eighth 53.9 km/h (33.5 mile/h)
Transmission Gear - Reverse 9.2 km/h (5.7 mile/h)
Implement Cycle Times
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)

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