621 Wheel Tractor-Scraper

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Description

Technical Specifications

Benefits and Features

Equipment

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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.

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
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
Engine
Engine Model - Tractor	Cat C13
Flywheel Power - Tractor	407 HP
Note	Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Rated Engine RPM - Tractor	2000 r/min
Service Refill Capacities
Hydraulic System	21.926 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	8.057 gal (US)
Non Push-Pull
Operating Weight - Empty	79787 lb
Overall Length	45.9 ft
Push-Pull
Overall Length - With Bail Down	51.1 ft
Operating Weight - Empty	80630 lb
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
Safety Criteria Compliance Standards
Rollover Protection Structure (ROPS)	ISO 3471:2008 for up to 17 084 kg (37,664 lb)
Brakes	ISO 3450:1996
Reverse Alarm	ISO 9533:2010
Falling Object Protective Structure (FOPS)	ISO 3449:2005 Level II
Seat Belt	SAE J386:JUN1985
Steering System	ISO 5010:2007
Travel Speeds - Runout
Transmission Gear - Seventh	24.8 mile/h
Transmission Gear - Fifth	13.6 mile/h
Transmission Gear - First	3.1 mile/h
Transmission Gear - Sixth	18.4 mile/h
Transmission Gear - Second	5.5 mile/h
Transmission Gear - Third	7.5 mile/h
Transmission Gear - Fourth	10.1 mile/h
Transmission Gear - Eighth	33.5 mile/h
Transmission Gear - Reverse	5.7 mile/h
Implement Cycle Times
Apron Raise	2.95 s
Bowl Raise	3 s
Ejector Retract	6.7 s
Bowl Lower	3.5 s
Apron Lower	3.8 s
Ejector Extend	5.2 s
Bail Lower	3.2 s
Bail Raise	1.8 s

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

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

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

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.

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).
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 jobsite.
Shorten the learning curve for inexperienced operators with Load Assist (optional attachment).

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.

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)