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.
Features
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BE MORE PRODUCTIVE
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WORK IN COMFORT
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DESIGNED FOR SAFETY
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EASY TO OPERATE
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INTEGRATED CAT TECHNOLOGIES
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EXECUTE EFFICIENCY
Specifications
Units for specifications
General
| Overall Shipping Height | 13.22 ft 4.03 m |
|---|---|
| Overall Width | 11.75 ft 3.58 m |
| Scraper Capacity - Heaped | 24.0 yd³ 18.4 m³ |
| Fuel Tank Refill Capacity - Scraper | 216.1 gal (US) 818.0 l |
| Tires - Scraper | 33.25R29**E3 |
| Width - Cut | 10.3 ft 3.14 m |
| Maximum Depth of Spread | 21.3 in 540.0 mm |
| Top Speed - Loaded | 33.5 mile/h 53.9 km/h |
| Rated Load | 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) |
| 180° Curb-to-Curb Turning Width | 38.71 ft 11.8 m |
| Scraper Capacity - Struck | 17.1 yd³ 13.0 m³ |
| Maximum Depth of Cut | 12.4 in 315.0 mm |
| Tires - Tractor Drive | 33.25R29**E3 |
Engine
| Engine Model - Tractor | Cat C13 |
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| Flywheel Power - Tractor | 407.0 hp 304.0 kW |
| Note | Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards. |
| Rated Engine RPM - Tractor | 2000.0 r/min 2000.0 r/min |
Tractor Engine
| Flywheel Power - Tractor/Scraper | 304 kW (407 hp) |
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Scraper Bowl
| Scraper Capacity - Heaped | 24.0 yd³ 18.4 m³ |
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Transmission
| Top Speed - Loaded | 33.5 mile/h 53.9 km/h |
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Service Refill Capacities
| Hydraulic System | 21.926 gal (US) 83.0 l |
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| Crankcase | 8.08 gal (US) 30.58 l |
| Transmission System | 24.76 gal (US) 93.0 l |
| Cooling System | 11.89 gal (US) 45.0 l |
| Fuel Tank | 216.09 gal (US) 818.0 l |
| Diesel Exhaust Fluid | 8.0572 gal (US) 30.5 l |
Dimensions
| Width - Overall Machine | 141.1 in 3585.0 mm |
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| Width - Tractor | 133.1 in 3381.0 mm |
| Width - Inside of Bowl | 120.0 in 3048.0 mm |
| Width - Outside Rear Tires | 128.9 in 3275.0 mm |
| Height - Overall Shipping | 158.6 in 4029.0 mm |
| Height - Top of Cab | 142.2 in 3612.0 mm |
| Ground Clearance - Tractor | 21.9 in 557.0 mm |
| Front of Tractor to Front Axle | 122.8 in 3119.0 mm |
| Axle to Vertical Hitch Pin | 21.3 in 540.0 mm |
| Height - Scraper Blade Maximum | 20.5 in 520.0 mm |
| Wheel Base | 314.9 in 7998.0 mm |
| Rear Axle - Rear of Machine | 114.1 in 2898.0 mm |
| Length - Overall Machine - Standard | 551.8 in 14015.0 mm |
| Length - Maximum (Push-Pull) | 613.2 in 15576.0 mm |
| Width - Overall Machine - Ladder Down | 149.2 in 3790.0 mm |
| Width - Rear Tire Centers | 90.2 in 2290.0 mm |
Non Push-Pull
| Operating Weight - Empty | 79787.0 lb 36185.0 kg |
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| Overall Length | 45.9 ft 14.02 m |
Push-Pull
| Overall Length - With Bail Down | 51.1 ft 15.58 m |
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| Operating Weight - Empty | 80630.0 lb 36567.0 kg |
Cab
| Exterior Sound Level | The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). |
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| 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) |
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| 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 39.9 km/h |
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| Transmission Gear - Fifth | 13.6 mile/h 21.9 km/h |
| Transmission Gear - First | 3.1 mile/h 5.0 km/h |
| Transmission Gear - Sixth | 18.4 mile/h 29.6 km/h |
| Transmission Gear - Second | 5.5 mile/h 8.9 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 - Eighth | 33.5 mile/h 53.9 km/h |
| Transmission Gear - Reverse | 5.7 mile/h 9.2 km/h |
Implement Cycle Times
| Apron Raise | 2.95 s 2.95 s |
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| Bowl Raise | 3.0 s 3.0 s |
| Ejector Retract | 6.7 s 6.7 s |
| Bowl Lower | 3.5 s 3.5 s |
| Apron Lower | 3.8 s 3.8 s |
| Ejector Extend | 5.2 s 5.2 s |
| Bail Lower | 3.2 s 3.2 s |
| Bail Raise | 1.8 s 1.8 s |
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)
Videos
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Wheel Tractor-Scraper K Series -
Wheel Tractor-Scraper K-Series Operator Testimonial