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Wheel Tractor-Scrapers

621

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.

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Overview

General

UNITS:

Metric

Imperial

Maximum Depth of Spread	540 mm	21.3 in
Scraper Capacity - Heaped	18.4 m³	24 yd³
Overall Width	3.57 m	11.71 ft
Maximum Depth of Cut	315 mm	12.4 in
Scraper Capacity - Struck	13 m³	17.1 yd³
Tires - Scraper	33.25R29**E3	33.25R29**E3
Width - Cut	3.14 m	10.3 ft
Fuel Tank Refill Capacity - Scraper	763 l	201 gal (US)
Top Speed - Loaded	53.9 km/h	33.5 mile/h
180° Curb-to-Curb Turning Width	11.8 m	38.71 ft
Overall Shipping Height	4.03 m	13.22 ft
Tires - Tractor Drive	33.25R29**E3	33.25R29**E3
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

Engine Model - Tractor	Cat C13	Cat C13
Rated Engine RPM - Tractor	2000 r/min	2000 r/min
Flywheel Power - Tractor	304 kW	407 hp
Note	C13 engine emits equivalent to U.S. EPA Tier 2/EU Stage II or U.S. EPA Tier 3/EU Stage III.	C13 engine emits equivalent to U.S. EPA Tier 2/EU Stage II or U.S. EPA Tier 3/EU Stage III.

Tractor Engine

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

Scraper Bowl

Scraper Capacity - Heaped	18.4 m³	24 yd³

Transmission

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

Service Refill Capacities

Transmission System	93 l	24.76 gal (US)
Hydraulic System	83 l	21.926 gal (US)
Crankcase	30.58 l	8.08 gal (US)
Cooling System	45 l	11.89 gal (US)
Fuel Tank	818 l	216.09 gal (US)

Dimensions

Width - Overall Machine	3585 mm	141.1 in
Width - Tractor	3381 mm	133.1 in
Width - Inside of Bowl	3048 mm	120 in
Width - Outside Rear Tires	3275 mm	128.9 in
Height - Overall Shipping	4029 mm	158.6 in
Height - Top of Cab	3612 mm	142.2 in
Ground Clearance - Tractor	557 mm	21.9 in
Front of Tractor to Front Axle	3119 mm	122.8 in
Axle to Vertical Hitch Pin	540 mm	21.3 in
Height - Scraper Blade Maximum	520 mm	20.5 in
Wheel Base	7998 mm	314.9 in
Rear Axle - Rear of Machine	2898 mm	114.1 in
Width - Rear Tire Centers	2290 mm	90.2 in
Length - Maximum (Push-Pull)	15576 mm	613.2 in
Length - Overall Machine - Standard	14015 mm	551.8 in
Width - Overall Machine - Ladder Down	3790 mm	149.2 in

Non Push-Pull

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

Push-Pull

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

Cab

Exterior Sound Level	The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).	The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).
ROPS/FOPS	Meets ISO standards	Meets ISO standards

Safety Criteria Compliance Standards

Falling Object Protective Structure (FOPS)	ISO 3449:2005 Level II	ISO 3449:2005 Level II
Reverse Alarm	ISO 9533:2010	ISO 9533:2010
Steering System	ISO 5010:2007	ISO 5010:2007
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)
Seat Belt	SAE J386:JUN1985	SAE J386:JUN1985
Brakes	ISO 3450:2011	ISO 3450:2011

Travel Speeds - Runout

Transmission Gear - Reverse	9.2 km/h	5.7 mile/h
Transmission Gear - Sixth	29.6 km/h	18.4 mile/h
Transmission Gear - Eighth	53.9 km/h	33.5 mile/h
Transmission Gear - Third	12.1 km/h	7.5 mile/h
Transmission Gear - Fourth	16.3 km/h	10.1 mile/h
Transmission Gear - Second	8.9 km/h	5.5 mile/h
Transmission Gear - Seventh	39.9 km/h	24.8 mile/h
Transmission Gear - First	5 km/h	3.1 mile/h
Transmission Gear - Fifth	21.9 km/h	13.6 mile/h

Implement Cycle Times

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

Features

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.

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

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.

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.

INTERGRATED CAT TECHNOLOGIES

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).

EXECUTE EFFICIENCY

Execute Efficiency

The new tractor hydraulic on-demand fan helps assist in 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

NOTE

Standard and optional equipment may vary. Consult your Cat dealer for details.

POWER TRAIN – TRACTOR

Cat C13
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 – 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

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.

Downloads

621 Key Features (Global)Download

621 Technical Specifications (Global)Download

Overview

General

UNITS:

Metric

Imperial

Maximum Depth of Spread	540 mm	21.3 in
Scraper Capacity - Heaped	18.4 m³	24 yd³
Overall Width	3.57 m	11.71 ft
Maximum Depth of Cut	315 mm	12.4 in
Scraper Capacity - Struck	13 m³	17.1 yd³
Tires - Scraper	33.25R29**E3	33.25R29**E3
Width - Cut	3.14 m	10.3 ft
Fuel Tank Refill Capacity - Scraper	763 l	201 gal (US)
Top Speed - Loaded	53.9 km/h	33.5 mile/h
180° Curb-to-Curb Turning Width	11.8 m	38.71 ft
Overall Shipping Height	4.03 m	13.22 ft
Tires - Tractor Drive	33.25R29**E3	33.25R29**E3
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

Engine Model - Tractor	Cat C13	Cat C13
Rated Engine RPM - Tractor	2000 r/min	2000 r/min
Flywheel Power - Tractor	304 kW	407 hp
Note	C13 engine emits equivalent to U.S. EPA Tier 2/EU Stage II or U.S. EPA Tier 3/EU Stage III.	C13 engine emits equivalent to U.S. EPA Tier 2/EU Stage II or U.S. EPA Tier 3/EU Stage III.

Tractor Engine

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

Scraper Bowl

Scraper Capacity - Heaped	18.4 m³	24 yd³

Transmission

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

Service Refill Capacities

Transmission System	93 l	24.76 gal (US)
Hydraulic System	83 l	21.926 gal (US)
Crankcase	30.58 l	8.08 gal (US)
Cooling System	45 l	11.89 gal (US)
Fuel Tank	818 l	216.09 gal (US)

Dimensions

Width - Overall Machine	3585 mm	141.1 in
Width - Tractor	3381 mm	133.1 in
Width - Inside of Bowl	3048 mm	120 in
Width - Outside Rear Tires	3275 mm	128.9 in
Height - Overall Shipping	4029 mm	158.6 in
Height - Top of Cab	3612 mm	142.2 in
Ground Clearance - Tractor	557 mm	21.9 in
Front of Tractor to Front Axle	3119 mm	122.8 in
Axle to Vertical Hitch Pin	540 mm	21.3 in
Height - Scraper Blade Maximum	520 mm	20.5 in
Wheel Base	7998 mm	314.9 in
Rear Axle - Rear of Machine	2898 mm	114.1 in
Width - Rear Tire Centers	2290 mm	90.2 in
Length - Maximum (Push-Pull)	15576 mm	613.2 in
Length - Overall Machine - Standard	14015 mm	551.8 in
Width - Overall Machine - Ladder Down	3790 mm	149.2 in

Non Push-Pull

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

Push-Pull

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

Cab

Exterior Sound Level	The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).	The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).
ROPS/FOPS	Meets ISO standards	Meets ISO standards

Safety Criteria Compliance Standards

Falling Object Protective Structure (FOPS)	ISO 3449:2005 Level II	ISO 3449:2005 Level II
Reverse Alarm	ISO 9533:2010	ISO 9533:2010
Steering System	ISO 5010:2007	ISO 5010:2007
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)
Seat Belt	SAE J386:JUN1985	SAE J386:JUN1985
Brakes	ISO 3450:2011	ISO 3450:2011

Travel Speeds - Runout

Transmission Gear - Reverse	9.2 km/h	5.7 mile/h
Transmission Gear - Sixth	29.6 km/h	18.4 mile/h
Transmission Gear - Eighth	53.9 km/h	33.5 mile/h
Transmission Gear - Third	12.1 km/h	7.5 mile/h
Transmission Gear - Fourth	16.3 km/h	10.1 mile/h
Transmission Gear - Second	8.9 km/h	5.5 mile/h
Transmission Gear - Seventh	39.9 km/h	24.8 mile/h
Transmission Gear - First	5 km/h	3.1 mile/h
Transmission Gear - Fifth	21.9 km/h	13.6 mile/h

Implement Cycle Times

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

Features

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.

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

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.

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.

INTERGRATED CAT TECHNOLOGIES

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).

EXECUTE EFFICIENCY

Execute Efficiency

The new tractor hydraulic on-demand fan helps assist in 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.

NOTE

Standard and optional equipment may vary. Consult your Cat dealer for details.

POWER TRAIN – TRACTOR

Cat C13
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 – 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

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)

NOTE

Standard and optional equipment may vary. Consult your Cat dealer for details.

Downloads

621 Key Features (Global)Download

621 Technical Specifications (Global)Download

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1300 881 064

Wheel Tractor-Scrapers

621

Overview

Features

Be More Productive

WORK IN COMFORT

Work in Comfort

DESIGNED FOR SAFETY

Designed for Safety

EASY TO OPERATE

Easy to Operate

INTERGRATED CAT TECHNOLOGIES

Integrated Cat Technologies

EXECUTE EFFICIENCY

Execute Efficiency

Standard Equipment

Optional Equipment

Downloads

Specifications

Overview

Features

Features

Be More Productive

WORK IN COMFORT

Work in Comfort

DESIGNED FOR SAFETY

Designed for Safety

EASY TO OPERATE

Easy to Operate

INTERGRATED CAT TECHNOLOGIES

Integrated Cat Technologies

EXECUTE EFFICIENCY

Execute Efficiency

Standard Equipment

Optional Equipment

Downloads

Downloads

Related Products