Overview
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
Units:
| Flywheel Power - Tractor/Scraper | 304 kW (407 hp) |
| Scraper Capacity - Heaped | — |
| Top Speed - Loaded | — |
Benefits & Features
December 9, 2025
Specifications
Units:
| Maximum Depth of Cut | — |
| Fuel Tank Refill Capacity - Scraper | — |
| 180° Curb-to-Curb Turning Width | — |
| Scraper Capacity - Heaped | — |
| Overall Width | — |
| Maximum Depth of Spread | — |
| Overall Shipping Height | — |
| Tires - Tractor Drive | 33.25R29**E3 |
| Width - Cut | — |
| Scraper Capacity - Struck | — |
| Top Speed - Loaded | — |
| Tires - Scraper | 33.25R29**E3 |
| Rated Load | 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) |
| Note | Cat® C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards. |
| Flywheel Power - Tractor | — |
| Rated Engine RPM - Tractor | — |
| Engine Model - Tractor | Cat® C13 |
| Flywheel Power - Tractor/Scraper | 304 kW (407 hp) |
| Scraper Capacity - Heaped | — |
| Top Speed - Loaded | — |
| Fuel Tank | — |
| Crankcase | — |
| Hydraulic System | — |
| Diesel Exhaust Fluid | — |
| Cooling System | — |
| Transmission System | — |
| Width - Overall Machine | — |
| Width - Tractor | — |
| Width - Inside of Bowl | — |
| Width - Outside Rear Tires | — |
| Height - Overall Shipping | — |
| Height - Top of Cab | — |
| Ground Clearance - Tractor | — |
| Front of Tractor to Front Axle | — |
| Axle to Vertical Hitch Pin | — |
| Height - Scraper Blade Maximum | — |
| Wheel Base | — |
| Rear Axle - Rear of Machine | — |
| Width - Overall Machine - Ladder Down | — |
| Length - Overall Machine - Standard | — |
| Length - Maximum (Push-Pull) | — |
| Width - Rear Tire Centers | — |
| Overall Length | — |
| Operating Weight - Empty | — |
| Operating Weight - Empty | — |
| Overall Length - With Bail Down | — |
| 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 |
| 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 |
| Seat Belt | SAE J386:JUN1985 |
| Transmission Gear - Eighth | — |
| Transmission Gear - Third | — |
| Transmission Gear - Fourth | — |
| Transmission Gear - First | — |
| Transmission Gear - Fifth | — |
| Transmission Gear - Reverse | — |
| Transmission Gear - Seventh | — |
| Transmission Gear - Sixth | — |
| Transmission Gear - Second | — |
| Ejector Retract | — |
| Bail Raise | — |
| Apron Raise | — |
| Apron Lower | — |
| Ejector Extend | — |
| Bowl Raise | — |
| Bowl Lower | — |
| Bail Lower | — |
Benefits & Features
BE MORE PRODUCTIVE
BE MORE PRODUCTIVE
- Advanced Productivity Electronic Control System (APECS) allows the engine and transmission to communicate on a high level. This communication allows the machine to utilize better 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 Cat Payload feature (optional attachment). Cat Payload is an automatic feature when ordered with Sequence Assist.
- Cat Payload for scrapers is an earthmoving solution for optimal payload and job site efficiency. Cat Payload achieves on-the-go weighing by using bowl lift cylinder pressure during the loaded haul segment. Cat Payload is optimized to be used with Sequence Assist, which provides increased productivity with less operator effort.
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
DESIGNED FOR SAFETY
- Enhance an operator’s awareness of site surroundings with the
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 predicting endstroke events and managing the
rate of dampening, resulting in reduced hitch maintenance and improved
operator ride in rough conditions.
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
operations. - Cat Advanced Ride Management (ARM) seat suspension reduces
endstroke 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's speed by canceling the throttle command
and engaging the engine compression brake.
INTEGRATED CAT TECHNOLOGIES
INTEGRATED CAT TECHNOLOGIES
- Monitor, manage, and enhance job site 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.
- Vision 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 job site.
- Shorten the learning curve for inexperienced operators with Cat grade control and load assist. (optional attachment).
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.
Data not available.
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)