621 Wheel Tractor-Scraper

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
24yd³
Transmission
Top Speed - Loaded
33.5mile/h
Dimensions
Width - Overall Machine
141.1in
Width - Tractor
133.1in
Width - Inside of Bowl
120in
Width - Outside Rear Tires
128.9in
Height - Overall Shipping
158.6in
Height - Top of Cab
142.2in
Ground Clearance - Tractor
21.9in
Front of Tractor to Front Axle
122.8in
Axle to Vertical Hitch Pin
21.3in
Height - Scraper Blade Maximum
20.5in
Wheel Base
314.9in
Rear Axle - Rear of Machine
114.1in
Length - Overall Machine - Standard
551.8in
Length - Maximum (Push-Pull)
613.2in
Width - Overall Machine - Ladder Down
149.2in
Width - Rear Tire Centers
90.2in
General
Overall Shipping Height
13.22ft
Overall Width
11.75ft
Scraper Capacity - Heaped
24yd³
Fuel Tank Refill Capacity - Scraper
216.1gal (US)
Tires - Scraper
33.25R29**E3
Width - Cut
10.3ft
Maximum Depth of Spread
21.3in
Top Speed - Loaded
33.5mile/h
Rated Load
26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
180° Curb-to-Curb Turning Width
38.71ft
Scraper Capacity - Struck
17.1yd³
Maximum Depth of Cut
12.4in
Tires - Tractor Drive
33.25R29**E3
Engine
Engine Model - Tractor
Cat C13
Flywheel Power - Tractor
407HP
Note
Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Rated Engine RPM - Tractor
2000r/min
Service Refill Capacities
Hydraulic System
21.926gal (US)
Crankcase
8.08gal (US)
Transmission System
24.76gal (US)
Cooling System
11.89gal (US)
Fuel Tank
216.09gal (US)
Diesel Exhaust Fluid
8.057gal (US)
Non Push-Pull
Operating Weight - Empty
79787lb
Overall Length
45.9ft
Push-Pull
Overall Length - With Bail Down
51.1ft
Operating Weight - Empty
80630lb
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
24.8mile/h
Transmission Gear - Fifth
13.6mile/h
Transmission Gear - First
3.1mile/h
Transmission Gear - Sixth
18.4mile/h
Transmission Gear - Second
5.5mile/h
Transmission Gear - Third
7.5mile/h
Transmission Gear - Fourth
10.1mile/h
Transmission Gear - Eighth
33.5mile/h
Transmission Gear - Reverse
5.7mile/h
Implement Cycle Times
Apron Raise
2.95s
Bowl Raise
3s
Ejector Retract
6.7s
Bowl Lower
3.5s
Apron Lower
3.8s
Ejector Extend
5.2s
Bail Lower
3.2s
Bail Raise
1.8s

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)
 

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