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.

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Features

  • BE MORE PRODUCTIVE

  • WORK IN COMFORT

  • DESIGNED FOR SAFETY

  • EASY TO OPERATE

  • INTEGRATED CAT TECHNOLOGIES

  • EXECUTE EFFICIENCY

Specifications

Units for specifications

General

Overall Shipping Height 13.22 ft 4.03 m
Overall Width 11.75 ft 3.58 m
Scraper Capacity - Heaped 24.0 yd³ 18.4 m³
Fuel Tank Refill Capacity - Scraper 216.1 gal (US) 818.0 l
Tires - Scraper 33.25R29**E3
Width - Cut 10.3 ft 3.14 m
Maximum Depth of Spread 21.3 in 540.0 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)
180° Curb-to-Curb Turning Width 38.71 ft 11.8 m
Scraper Capacity - Struck 17.1 yd³ 13.0 m³
Maximum Depth of Cut 12.4 in 315.0 mm
Tires - Tractor Drive 33.25R29**E3

Engine

Engine Model - Tractor Cat C13
Flywheel Power - Tractor 407.0 hp 304.0 kW
Note Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Rated Engine RPM - Tractor 2000.0 r/min 2000.0 r/min

Tractor Engine

Flywheel Power - Tractor/Scraper 304 kW (407 hp)

Scraper Bowl

Scraper Capacity - Heaped 24.0 yd³ 18.4 m³

Transmission

Top Speed - Loaded 33.5 mile/h 53.9 km/h

Service Refill Capacities

Hydraulic System 21.926 gal (US) 83.0 l
Crankcase 8.08 gal (US) 30.58 l
Transmission System 24.76 gal (US) 93.0 l
Cooling System 11.89 gal (US) 45.0 l
Fuel Tank 216.09 gal (US) 818.0 l
Diesel Exhaust Fluid 8.0572 gal (US) 30.5 l

Dimensions

Width - Overall Machine 141.1 in 3585.0 mm
Width - Tractor 133.1 in 3381.0 mm
Width - Inside of Bowl 120.0 in 3048.0 mm
Width - Outside Rear Tires 128.9 in 3275.0 mm
Height - Overall Shipping 158.6 in 4029.0 mm
Height - Top of Cab 142.2 in 3612.0 mm
Ground Clearance - Tractor 21.9 in 557.0 mm
Front of Tractor to Front Axle 122.8 in 3119.0 mm
Axle to Vertical Hitch Pin 21.3 in 540.0 mm
Height - Scraper Blade Maximum 20.5 in 520.0 mm
Wheel Base 314.9 in 7998.0 mm
Rear Axle - Rear of Machine 114.1 in 2898.0 mm
Length - Overall Machine - Standard 551.8 in 14015.0 mm
Length - Maximum (Push-Pull) 613.2 in 15576.0 mm
Width - Overall Machine - Ladder Down 149.2 in 3790.0 mm
Width - Rear Tire Centers 90.2 in 2290.0 mm

Non Push-Pull

Operating Weight - Empty 79787.0 lb 36185.0 kg
Overall Length 45.9 ft 14.02 m

Push-Pull

Overall Length - With Bail Down 51.1 ft 15.58 m
Operating Weight - Empty 80630.0 lb 36567.0 kg

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 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 5.0 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

Implement Cycle Times

Apron Raise 2.95 s 2.95 s
Bowl Raise 3.0 s 3.0 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)

Videos

  • Wheel Tractor-Scraper K Series
  • Wheel Tractor-Scraper K-Series Operator Testimonial
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Documents