621

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.

621

DESCRIPTION

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.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.

Wheel Tractor-Scraper K-Series

Wheel Tractor-Scraper K-Series Operator Testimonial

BE MORE PRODUCTIVE

  • Up to 8% improvement in productivity.
  • Advanced Productivity Electronic Control System (APECS) allows
    the engine and transmission to communicate on a high level. This communication allows the machine to better utilize the power
    and torque the engine is producing. The net result is moving more
    material.
  • Use Ground Speed Control to set the desired top speed and the
    machine will find the gear that works best for the engine and the
    transmission, providing a lower fuel burn.
  • The Machine Speed Limit feature replaces Top Gear Selection.
  • Auto-Stall assists in quickly bringing the transmission to an
    operating temperature at start-up when the machine is working in a
    cold climate region.
  • Boost productivity with the Payload Estimator feature (optional
    attachment). Payload Estimator is an automatic feature when
    ordered with Sequence Assist.
  • Cat®Payload Estimator for scrapers is an earthmoving solution for
    optimal payload and jobsite efficiency. Payload Estimator achieves on-the-go weighing by using bowl lift cylinder pressure during the
    loaded haul segment. Payload Estimator is optimized to be used
    with Sequence Assist, which provides increased productivity with
    less operator effort.

BE MORE PRODUCTIVE
WORK IN COMFORT

WORK IN COMFORT

        
  • Reduce up to 14 individual operator commands per cycle with Sequence Assist (optional attachment).
    •     
  • Steer with less effort using the newly designed high-pressure 
    steering system.
    •     
  • Enjoy interior improvements and a more ergonomic work environment
     with a 21% larger cab than the G Series cab.
    •     
  • Intuitive, ergonomic controls keep operators focused on their work.
    •     
  • Maintain desired cab temperature with automatic temperature 
    control.

DESIGNED FOR SAFETY

  • Get in and out of the cab easier with the new powered access
    ladder system (optional attachment).
  • Enhance an operator’s awareness of site surroundings with the
    optional Work Area Vision System (WAVS).
  • Seat belt indicator provides visual and audible alerts when the seat
    belt is not in use.
  • Advanced Cushion Hitch allows the cushion hitch to prevent end
    stroke by having the ability to predict end stroke events and manage
    the rate of dampening, resulting in reduced hitch maintenance and
    improved operator ride in rough conditions.

DESIGNED FOR SAFETY
EASY TO OPERATE

EASY TO OPERATE

  • The spacious cab features easy, intuitive controls and excellent
    visibility. The cab provides a comfortable working environment for
    all-day operation.
  • Cat Advanced Ride Management (ARM) seat suspension reduces
    end stroke movement of the load cylinder for a smoother ride.
  • Engine overspeed protection will automatically engage with no
    operator input when the machine is in eighth gear. The machine
    will assist in slowing the machine speed by canceling the throttle
    command and engaging the engine compression brake.

INTEGRATED CAT TECHNOLOGIES

  • Monitor, manage, and enhance jobsite operations.
  • Hit target grade faster and more accurately with Cat GRADE technologies. Finish jobs in fewer passes and with less operator effort, saving you time and helping to increase profit.
  • Product Link™ collects machine data that can be viewed online through web and mobile applications (optional attachment).
  • Access information anytime, anywhere with Vision Link®– use it to make informed decisions that boost productivity, lower costs, simplify maintenance, and improve safety and security on your jobsite.
  • Shorten the learning curve for inexperienced operators with Load Assist (optional attachment).

INTEGRATED CAT TECHNOLOGIES
EXECUTE EFFICIENCY

EXECUTE EFFICIENCY

  • The new tractor hydraulic on-demand fan helps assist in lower fuel consumption.
  • The Cat C13 tractor engine meets U.S. EPA Tier 4 Final or EU Stage V emission standards, contributing to lower fuel consumption.
  • Using draft-arm overflow guards diverts material away from the bowl, preventing material from getting caught between the draft arms and the bowl sides.
  • Cat Grade Control (optional attachment) intelligently ensures the machine does not cut below grade in a cut area or overfill in the fill area.

  • Standard Equipment
  • Optional Equipment
  • Specs
  • Docs

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

Specs

Overview

Long Name:
621 Wheel Tractor-Scraper
Name:
621
Brand:
Caterpillar
Status:
Current

General

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
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)
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

Engine

Engine Model - Tractor
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.
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
24 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 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

Dimensions

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

Non Push-Pull

Operating Weight - Empty
79787 lb / 36185 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 lb / 36567 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 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 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

SEE HOW 621 COMPARES AGAINST FREQUENTLY COMPARED PRODUCTS.

Open Bowl Scrapers
621
621
Brand
Caterpillar
Status
Current
Scraper Capacity - Heaped
24 yd³ / 18.4 m³
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)
Flywheel Power - Tractor/Scraper
304 kW (407 hp)
Crankcase
8.08 gal (US) / 30.58 l
Cooling System
11.89 gal (US) / 45 l
Fuel Tank
216.09 gal (US) / 818 l
Width - Overall Machine
141.1 in / 3585 mm
Width - Tractor
133.1 in / 3381 mm
Width - Inside of Bowl
120 in / 3048 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
Selected Model
Open Bowl Scrapers
657
657
Brand
Caterpillar
Status
Current
Scraper Capacity - Heaped
44 yd³ / 33.6 m³
Top Speed - Loaded
33 mile/h / 56.1 km/h
Rated Load
104058 lb / 47200 kg
Flywheel Power - Tractor/Scraper
469kW (629 hp) / 353 kW (473 hp)
Crankcase
8.9 gal (US) / 34 l
Cooling System
16.6 gal (US) / 63.2 l
Fuel Tank
430 gal (US) / 1628 l
Width - Overall Machine
14.3 ft / 4.36 m
Width - Tractor
12.3 ft / 3.75 m
Width - Inside of Bowl
12.07 ft / 3.68 m
Height - Overall Shipping
15.29 ft / 4.66 m
Height - Top of Cab
12.86 ft / 3.92 m
Ground Clearance - Tractor
2.3 ft / 0.7 m
Front of Tractor to Front Axle
14.93 ft / 4.55 m
Axle to Vertical Hitch Pin
1.8 ft / 0.55 m
Height - Scraper Blade Maximum
2.17 ft / 0.66 m
Wheel Base
32.68 ft / 9.96 m
Rear Axle - Rear of Machine
8.07 ft / 2.46 m
More Details
Open Bowl Scrapers
651
651
Brand
Cat
Status
Current
Scraper Capacity - Heaped
44 yd³ / 33.6 m³
Top Speed - Loaded
34.9 mile/h / 56.1 km/h
Rated Load
104058 lb / 47200 kg
Flywheel Power - Tractor/Scraper
469kW (629 hp)
Crankcase
8.9 gal (US) / 34 l
Cooling System
16.6 gal (US) / 63.2 l
Fuel Tank
430 gal (US) / 1628 l
Width - Overall Machine
14.3 ft / 4.36 m
Width - Tractor
12.3 ft / 3.75 m
Width - Inside of Bowl
12.07 ft / 3.68 m
Height - Overall Shipping
15.29 ft / 4.66 m
Height - Top of Cab
12.86 ft / 3.92 m
Ground Clearance - Tractor
2.3 ft / 0.7 m
Front of Tractor to Front Axle
14.93 ft / 4.55 m
Axle to Vertical Hitch Pin
1.8 ft / 0.55 m
Height - Scraper Blade Maximum
2.17 ft / 0.66 m
Wheel Base
32.68 ft / 9.96 m
Rear Axle - Rear of Machine
8.07 ft / 2.46 m
More Details