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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Tractor Engine
- Flywheel Power - Tractor/Scraper
- 304 kW (407 hp)
Scraper Bowl
- Scraper Capacity - Heaped
- 24 yd³
Transmission
- Top Speed - Loaded
- 33.5 mile/h
Dimensions
- Width - Overall Machine
- 141.1 in
- Width - Tractor
- 133.1 in
- Width - Inside of Bowl
- 120 in
- Width - Outside Rear Tires
- 128.9 in
- Height - Overall Shipping
- 158.6 in
- Height - Top of Cab
- 142.2 in
- Ground Clearance - Tractor
- 21.9 in
- Front of Tractor to Front Axle
- 122.8 in
- Axle to Vertical Hitch Pin
- 21.3 in
- Height - Scraper Blade Maximum
- 20.5 in
- Wheel Base
- 314.9 in
- Rear Axle - Rear of Machine
- 114.1 in
- Length - Overall Machine - Standard
- 551.8 in
- Length - Maximum (Push-Pull)
- 613.2 in
- Width - Overall Machine - Ladder Down
- 149.2 in
- Width - Rear Tire Centers
- 90.2 in
Safety Criteria Compliance Standards
- Reverse Alarm
- ISO 9,533:2,010
- Brakes
- ISO 3,450:1,996
- Steering System
- ISO 5,010:2,007
- Rollover Protection Structure (ROPS)
- ISO 3,471:2,008 for up to 17 084 kg (37,664 lb)
- Falling Object Protective Structure (FOPS)
- ISO 3,449:2,005 Level II
- Seat Belt
- SAE J386:JUN1,985
Cab
- ROPS/FOPS
- Meets SAE and ISO standards
- Exterior Sound Level
- The exterior sound power level for the standard machine (ISO 6,393:2,008) is 118 dB(A).
Push-Pull
- Operating Weight - Empty
- 80,630 lb
- Overall Length - With Bail Down
- 51.1 ft
Travel Speeds - Runout
- Transmission Gear - Eighth
- 33.5 mile/h
- Transmission Gear - Reverse
- 5.7 mile/h
- Transmission Gear - Fourth
- 10.1 mile/h
- Transmission Gear - Third
- 7.5 mile/h
- Transmission Gear - Second
- 5.5 mile/h
- Transmission Gear - Sixth
- 18.4 mile/h
- Transmission Gear - First
- 3.1 mile/h
- Transmission Gear - Fifth
- 13.6 mile/h
- Transmission Gear - Seventh
- 24.8 mile/h
General
- Overall Shipping Height
- 13.22 ft
- Overall Width
- 11.75 ft
- Scraper Capacity - Heaped
- 24 yd³
- Fuel Tank Refill Capacity - Scraper
- 216.1 gal (US)
- Tires - Scraper
- 33.25R29**E3
- Width - Cut
- 10.3 ft
- Maximum Depth of Spread
- 21.3 in
- Top Speed - Loaded
- 33.5 mile/h
- Rated Load
- 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
- 180° Curb-to-Curb Turning Width
- 38.71 ft
- Scraper Capacity - Struck
- 17.1 yd³
- Maximum Depth of Cut
- 12.4 in
- Tires - Tractor Drive
- 33.25R29**E3
Implement Cycle Times
- Bail Lower
- 3.2 s
- Ejector Extend
- 5.2 s
- Apron Lower
- 3.8 s
- Bowl Lower
- 3.5 s
- Ejector Retract
- 6.7 s
- Bowl Raise
- 3 s
- Apron Raise
- 2.95 s
- Bail Raise
- 1.8 s
Engine
- Flywheel Power - Tractor
- 407 hp
- Engine Model - Tractor
- Cat C13
- Note
- Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
- Rated Engine RPM - Tractor
- 2,000 r/min
Non Push-Pull
- Overall Length
- 45.9 ft
- Operating Weight - Empty
- 79,787 lb
Service Refill Capacities
- Hydraulic System
- 21.93 gal (US)
- Crankcase
- 8.08 gal (US)
- Transmission System
- 24.76 gal (US)
- Cooling System
- 11.89 gal (US)
- Fuel Tank
- 216.09 gal (US)
- Diesel Exhaust Fluid
- 8.06 gal (US)
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)
Specifications
Tractor Engine
- Flywheel Power - Tractor/Scraper
- 304 kW (407 hp)
Scraper Bowl
- Scraper Capacity - Heaped
- 24 yd³
Transmission
- Top Speed - Loaded
- 33.5 mile/h
Dimensions
- Width - Overall Machine
- 141.1 in
- Width - Tractor
- 133.1 in
- Width - Inside of Bowl
- 120 in
- Width - Outside Rear Tires
- 128.9 in
- Height - Overall Shipping
- 158.6 in
- Height - Top of Cab
- 142.2 in
- Ground Clearance - Tractor
- 21.9 in
- Front of Tractor to Front Axle
- 122.8 in
- Axle to Vertical Hitch Pin
- 21.3 in
- Height - Scraper Blade Maximum
- 20.5 in
- Wheel Base
- 314.9 in
- Rear Axle - Rear of Machine
- 114.1 in
- Length - Overall Machine - Standard
- 551.8 in
- Length - Maximum (Push-Pull)
- 613.2 in
- Width - Overall Machine - Ladder Down
- 149.2 in
- Width - Rear Tire Centers
- 90.2 in
Safety Criteria Compliance Standards
- Reverse Alarm
- ISO 9,533:2,010
- Brakes
- ISO 3,450:1,996
- Steering System
- ISO 5,010:2,007
- Rollover Protection Structure (ROPS)
- ISO 3,471:2,008 for up to 17 084 kg (37,664 lb)
- Falling Object Protective Structure (FOPS)
- ISO 3,449:2,005 Level II
- Seat Belt
- SAE J386:JUN1,985
Cab
- ROPS/FOPS
- Meets SAE and ISO standards
- Exterior Sound Level
- The exterior sound power level for the standard machine (ISO 6,393:2,008) is 118 dB(A).
Push-Pull
- Operating Weight - Empty
- 80,630 lb
- Overall Length - With Bail Down
- 51.1 ft
Travel Speeds - Runout
- Transmission Gear - Eighth
- 33.5 mile/h
- Transmission Gear - Reverse
- 5.7 mile/h
- Transmission Gear - Fourth
- 10.1 mile/h
- Transmission Gear - Third
- 7.5 mile/h
- Transmission Gear - Second
- 5.5 mile/h
- Transmission Gear - Sixth
- 18.4 mile/h
- Transmission Gear - First
- 3.1 mile/h
- Transmission Gear - Fifth
- 13.6 mile/h
- Transmission Gear - Seventh
- 24.8 mile/h
General
- Overall Shipping Height
- 13.22 ft
- Overall Width
- 11.75 ft
- Scraper Capacity - Heaped
- 24 yd³
- Fuel Tank Refill Capacity - Scraper
- 216.1 gal (US)
- Tires - Scraper
- 33.25R29**E3
- Width - Cut
- 10.3 ft
- Maximum Depth of Spread
- 21.3 in
- Top Speed - Loaded
- 33.5 mile/h
- Rated Load
- 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
- 180° Curb-to-Curb Turning Width
- 38.71 ft
- Scraper Capacity - Struck
- 17.1 yd³
- Maximum Depth of Cut
- 12.4 in
- Tires - Tractor Drive
- 33.25R29**E3
Implement Cycle Times
- Bail Lower
- 3.2 s
- Ejector Extend
- 5.2 s
- Apron Lower
- 3.8 s
- Bowl Lower
- 3.5 s
- Ejector Retract
- 6.7 s
- Bowl Raise
- 3 s
- Apron Raise
- 2.95 s
- Bail Raise
- 1.8 s
Engine
- Flywheel Power - Tractor
- 407 hp
- Engine Model - Tractor
- Cat C13
- Note
- Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
- Rated Engine RPM - Tractor
- 2,000 r/min
Non Push-Pull
- Overall Length
- 45.9 ft
- Operating Weight - Empty
- 79,787 lb
Service Refill Capacities
- Hydraulic System
- 21.93 gal (US)
- Crankcase
- 8.08 gal (US)
- Transmission System
- 24.76 gal (US)
- Cooling System
- 11.89 gal (US)
- Fuel Tank
- 216.09 gal (US)
- Diesel Exhaust Fluid
- 8.06 gal (US)
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
-
- 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)