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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.

Specifications

Tractor Engine

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

Scraper Bowl

Scraper Capacity - Heaped
24yd³

Transmission

Top Speed - Loaded
33.5mile/h

Dimensions

Width - Overall Machine
141.1in
Width - Tractor
133.1in
Width - Inside of Bowl
120in
Width - Outside Rear Tires
128.9in
Height - Overall Shipping
158.6in
Height - Top of Cab
142.2in
Ground Clearance - Tractor
21.9in
Front of Tractor to Front Axle
122.8in
Axle to Vertical Hitch Pin
21.3in
Height - Scraper Blade Maximum
20.5in
Wheel Base
314.9in
Rear Axle - Rear of Machine
114.1in
Width - Overall Machine - Ladder Down
149.2in
Length - Overall Machine - Standard
551.8in
Length - Maximum (Push-Pull)
613.2in
Width - Rear Tire Centers
90.2in

Safety Criteria Compliance Standards

Seat Belt
SAE J386:JUN1985
Reverse Alarm
ISO 9533:2010
Brakes
ISO 3450:1996
Rollover Protection Structure (ROPS)
ISO 3471:2008 for up to 17 084 kg (37,664 lb)
Falling Object Protective Structure (FOPS)
ISO 3449:2005 Level II
Steering System
ISO 5010:2007

Travel Speeds - Runout

Transmission Gear - Eighth
33.5mile/h
Transmission Gear - Third
7.5mile/h
Transmission Gear - Fourth
10.1mile/h
Transmission Gear - First
3.1mile/h
Transmission Gear - Fifth
13.6mile/h
Transmission Gear - Reverse
5.7mile/h
Transmission Gear - Seventh
24.8mile/h
Transmission Gear - Sixth
18.4mile/h
Transmission Gear - Second
5.5mile/h

Implement Cycle Times

Ejector Retract
6.7s
Bail Raise
1.8s
Apron Raise
2.95s
Apron Lower
3.8s
Ejector Extend
5.2s
Bowl Raise
3s
Bowl Lower
3.5s
Bail Lower
3.2s

General

Maximum Depth of Cut
12.4in
Fuel Tank Refill Capacity - Scraper
216.1gal (US)
180° Curb-to-Curb Turning Width
38.71ft
Scraper Capacity - Heaped
24yd³
Overall Width
11.75ft
Maximum Depth of Spread
21.3in
Overall Shipping Height
13.22ft
Tires - Tractor Drive
33.25R29**E3
Width - Cut
10.3ft
Scraper Capacity - Struck
17.1yd³
Top Speed - Loaded
33.5mile/h
Tires - Scraper
33.25R29**E3
Rated Load
26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)

Engine

Note
Cat® C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Flywheel Power - Tractor
407hp
Rated Engine RPM - Tractor
2000r/min
Engine Model - Tractor
Cat® C13

Service Refill Capacities

Fuel Tank
216.09gal (US)
Crankcase
8.08gal (US)
Hydraulic System
21.926gal (US)
Diesel Exhaust Fluid
8.057gal (US)
Cooling System
11.89gal (US)
Transmission System
24.76gal (US)

Non Push-Pull

Overall Length
45.9ft
Operating Weight - Empty
79787lb

Push-Pull

Operating Weight - Empty
80630lb
Overall Length - With Bail Down
51.1ft

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

Standard/Optional Features

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
  • Integrated Technologies
    • Sequence Assist and Cat Payload Arrangement
  • 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
    • Camera arrangement - WAVS
    • 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
    • Interactive touchscreen vehicle information 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
    • Fender, 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
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)
  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Steering Arrangements
    • Secondary Steering Arrangement
  • Integrated Technologies
    • Cat Grade Control, Cat Payload, Sequence Assit, and Load Assist
  • Other Attachments
    • Steering lock - external
    • Cab beacon with air horn
    • Air horn
    • Air horn and beacon
    • Wiring group
    • Year of manufacture plate
  • Other Standard Equipment – Scraper
    • Bowl overflow guard
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)

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