The Cat 621 Wheel Tractor-Scraper

Open Bowl Scrapers 621

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Key Specs

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

Scraper Capacity - Heaped: 24 yd³; 18.4 m³

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

621
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Overview

REDFINING YOUR PROFIT POTENTIAL

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.

Benefits

Increased Comfort

Ergonomic controls and a newly redesigned cab interior provide a more comfortable and efficient working environment all day long

Improved Productivity

Improvements in fuel efficiency and responsive APECS transmission controls deliver more productivity in most applications

Additional Safety

New safety features help operators be more productive and work more efficiently all day long

Features At A Glance

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.

Specifications Standard Equipment Optional Equipment

Product Specifications for 621

General

Maximum Depth of Cut	12.4 in 315 mm
Fuel Tank Refill Capacity - Scraper	216.1 gal (US) 818 l
180° Curb-to-Curb Turning Width	38.71 ft 11.8 m
Scraper Capacity - Heaped	24 yd³ 18.4 m³
Overall Width	11.75 ft 3.58 m
Maximum Depth of Spread	21.3 in 540 mm
Overall Shipping Height	13.22 ft 4.03 m
Tires - Tractor Drive	33.25R29E3 33.25R29E3
Width - Cut	10.3 ft 3.14 m
Scraper Capacity - Struck	17.1 yd³ 13 m³
Top Speed - Loaded	33.5 mile/h 53.9 km/h
Tires - Scraper	33.25R29E3 33.25R29E3
Rated Load	26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) 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. Cat® C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Flywheel Power - Tractor	407 hp 304 kW
Rated Engine RPM - Tractor	2000 r/min 2000 r/min
Engine Model - Tractor	Cat® C13 Cat® C13

Tractor Engine

Flywheel Power - Tractor/Scraper

304 kW (407 hp) 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

Fuel Tank	216.09 gal (US) 818 l
Crankcase	8.08 gal (US) 30.58 l
Hydraulic System	21.926 gal (US) 83 l
Diesel Exhaust Fluid	8.057 gal (US) 30.5 l
Cooling System	11.89 gal (US) 45 l
Transmission System	24.76 gal (US) 93 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
Width - Overall Machine - Ladder Down	149.2 in 3790 mm
Length - Overall Machine - Standard	551.8 in 14015 mm
Length - Maximum (Push-Pull)	613.2 in 15576 mm
Width - Rear Tire Centers	90.2 in 2290 mm

Non Push-Pull

Overall Length	45.9 ft 14.02 m
Operating Weight - Empty	79787 lb 36185 kg

Push-Pull

Operating Weight - Empty	80630 lb 36567 kg
Overall Length - With Bail Down	51.1 ft 15.58 m

Cab

Exterior Sound Level	The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A).
ROPS/FOPS	Meets SAE and ISO standards Meets SAE and ISO standards

Safety Criteria Compliance Standards

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

Travel Speeds - Runout

Transmission Gear - Eighth	33.5 mile/h 53.9 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 - First	3.1 mile/h 5 km/h
Transmission Gear - Fifth	13.6 mile/h 21.9 km/h
Transmission Gear - Reverse	5.7 mile/h 9.2 km/h
Transmission Gear - Seventh	24.8 mile/h 39.9 km/h
Transmission Gear - Sixth	18.4 mile/h 29.6 km/h
Transmission Gear - Second	5.5 mile/h 8.9 km/h

Implement Cycle Times

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

621 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)

621 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)

Product Specifications for 621

Download Print

General

Maximum Depth of Cut	12.4 in 315 mm
Fuel Tank Refill Capacity - Scraper	216.1 gal (US) 818 l
180° Curb-to-Curb Turning Width	38.71 ft 11.8 m
Scraper Capacity - Heaped	24 yd³ 18.4 m³
Overall Width	11.75 ft 3.58 m
Maximum Depth of Spread	21.3 in 540 mm
Overall Shipping Height	13.22 ft 4.03 m
Tires - Tractor Drive	33.25R29E3 33.25R29E3
Width - Cut	10.3 ft 3.14 m
Scraper Capacity - Struck	17.1 yd³ 13 m³
Top Speed - Loaded	33.5 mile/h 53.9 km/h
Tires - Scraper	33.25R29E3 33.25R29E3
Rated Load	26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) 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. Cat® C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Flywheel Power - Tractor	407 hp 304 kW
Rated Engine RPM - Tractor	2000 r/min 2000 r/min
Engine Model - Tractor	Cat® C13 Cat® C13

Tractor Engine

Flywheel Power - Tractor/Scraper

304 kW (407 hp) 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

Fuel Tank	216.09 gal (US) 818 l
Crankcase	8.08 gal (US) 30.58 l
Hydraulic System	21.926 gal (US) 83 l
Diesel Exhaust Fluid	8.057 gal (US) 30.5 l
Cooling System	11.89 gal (US) 45 l
Transmission System	24.76 gal (US) 93 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
Width - Overall Machine - Ladder Down	149.2 in 3790 mm
Length - Overall Machine - Standard	551.8 in 14015 mm
Length - Maximum (Push-Pull)	613.2 in 15576 mm
Width - Rear Tire Centers	90.2 in 2290 mm

Non Push-Pull

Overall Length	45.9 ft 14.02 m
Operating Weight - Empty	79787 lb 36185 kg

Push-Pull

Operating Weight - Empty	80630 lb 36567 kg
Overall Length - With Bail Down	51.1 ft 15.58 m

Cab

Exterior Sound Level	The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A).
ROPS/FOPS	Meets SAE and ISO standards Meets SAE and ISO standards

Safety Criteria Compliance Standards

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

Travel Speeds - Runout

Transmission Gear - Eighth	33.5 mile/h 53.9 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 - First	3.1 mile/h 5 km/h
Transmission Gear - Fifth	13.6 mile/h 21.9 km/h
Transmission Gear - Reverse	5.7 mile/h 9.2 km/h
Transmission Gear - Seventh	24.8 mile/h 39.9 km/h
Transmission Gear - Sixth	18.4 mile/h 29.6 km/h
Transmission Gear - Second	5.5 mile/h 8.9 km/h

Implement Cycle Times

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

621 Standard Equipment

Print

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)

621 Optional Equipment

Print

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)

See how 621 compares against frequently compared products.

Wheel Tractor-Scrapers

Selected

621

621

Flywheel Power - Tractor/Scraper: 304 kW (407 hp); 304 kW (407 hp)
Scraper Capacity - Heaped: 24 yd³; 18.4 m³
Top Speed - Loaded: 33.5 mile/h; 53.9 km/h

Wheel Tractor-Scrapers

627

627

Flywheel Power - Tractor/Scraper: 304 kW (407 hp)/216 kW (290 hp); 304 kW (407 hp)/216 kW (290 hp)
Scraper Capacity - Heaped: 24 yd³; 18.4 m³
Top Speed - Loaded: 33.5 mile/h; 53.9 km/h

View Details

Wheel Tractor-Scrapers

631

631

Flywheel Power - Tractor/Scraper: 570 hp; 425 kW
Scraper Capacity - Heaped: 34 yd³; 26 m³
Top Speed - Loaded: 34.7 mile/h; 55.8 km/h

View Details

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