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SPECS SUMMARY

Tractor EngineCat C18
Flywheel Power - Tractor/Scraper469kW (629 hp) / 353 kW (473 hp)
Scraper Capacity - Heaped44 yd³ (33.6 m³)
Scraper EngineCat C15
Cat® Wheel Tractor-Scraper 657 twin engine has the power to boost productivity by utilize push-pull loading. Combine this ability with improvements in productivity, enhancements in operator comfort, and new safety features – Powered Access System and effective wet disc brakes – and you have a machine offering high returns on profit and time.

Specifications

Tractor EngineCat C18
Flywheel Power - Tractor/Scraper469kW (629 hp) / 353 kW (473 hp)
Scraper Capacity - Heaped44 yd³ (33.6 m³)
Scraper EngineCat C15
Top Speed - Loaded33 mile/h (56.1 km/h)
Net Power469 kW/637 hp
Net Power353 kW/447 hp
Rated Load104058 lb (47200 kg)
Gross Power (SAE J1995)637 HP (475 kW)
Gross Power (SAE J1995)481 HP (359 kW)
Net Power (ISO 14396)637 HP (469 kW)
Net Power (ISO 14396)480 HP (353 kW)
Net Power (SAE J1349/ISO 9249)415 HP (333 kW)
Net Power (SAE J1349/ISO 9249)584 HP (436 kW)
Net Power (SAE J1349/ISO 9249)592 HP (436 kW)
Total Shipping160505 lb (72804 kg)
Tractor Shipping93635 lb (42472 kg)
Scraper Shipping64068 lb (29061 kg)
Total Operating - Empty164244 lb (74500 kg)
Front Axle93842 lb (42566 kg)
Rear Axle66663 lb (30238 kg)
Total Operating - Loaded268302 lb (121700 kg)
Front Axle - Loaded134165 lb (60856 kg)
Rear Axle - Loaded130340 lb (59121 kg)
Width - Overall Machine14.3 ft (4.36 m)
Width - Tractor12.3 ft (3.75 m)
Width - Rear Tire Center Lines9.21 ft (2.81 m)
Width - Inside of Bowl12.07 ft (3.68 m)
Width - Outside Bowl - Shipping Width12.98 ft (3.93 m)
Height - Overall Shipping15.29 ft (4.66 m)
Height - Top of Cab12.86 ft (3.92 m)
Ground Clearance - Tractor2.3 ft (0.7 m)
Front of Tractor to Front Axle14.93 ft (4.55 m)
Axle to Vertical Hitch Pin1.8 ft (0.55 m)
Height - Scraper Blade Maximum2.17 ft (0.66 m)
Wheel Base32.68 ft (9.96 m)
Length - Overall Machine58.96 ft (17.97 m)
Rear Axle - Rear of Machine8.07 ft (2.46 m)
Capacity - Struck32 yd³ (24.5 m³)
Depth of Cut - Maximum16.4 in (417 mm)
Width - Cut - To Router Bits12.5 ft (3.8 m)
Ground Clearance - Maximum2.3 ft (0.7 m)
Hyd. Penetration Force - 657G121000 lb (542 kN)
Depth of Spread - Maximum26 in (660 mm)
Apron Opening92 in (2337 mm)
Apron Closure Force39200 lb (176 kN)
Bore5.7 in (145 mm)
Bore5.4 in (137.2 mm)
Stroke7.2 in (183 mm)
Stroke6.75 in (171.5 mm)
Displacement1105 in³ (18.1 l)
Displacement928 in³ (15.2 l)
1 Forward3.5 mile/h (5.7 km/h)
2 Forward6.5 mile/h (10.5 km/h)
3 Forward7.8 mile/h (12.5 km/h)
4 Forward10.6 mile/h (17 km/h)
5 Forward14.2 mile/h (22.8 km/h)
6 Forward19.2 mile/h (30.9 km/h)
7 Forward25.7 mile/h (41.4 km/h)
8 Forward34.9 mile/h (56.1 km/h)
Reverse6.7 mile/h (10.8 km/h)
Width - 180° Turn - Right45.4 ft (13.85 m)
Width - 180° Turn - Left47.57 ft (14.5 m)
Steering Angle - Right90
Steering Angle - Left85
Crankcase13.7 gal (US) (38 l)
Transmission35.9 gal (US) (136 l)
Differential36 gal (US) (136 l)
Final Drive - Each6 gal (US) (29.5 l)
Cooling System23.4 gal (US) (88.6 l)
Hydraulic Reservoir39.6 gal (US) (150 l)
Windshield Washer0.5 gal (US) (5 l)
Bowl Cylinder Bore7.08 in (180 mm)
Bowl Cylinder Stroke37.4 in (950 mm)
Apron Cylinder Bore7.08 in (180 mm)
Apron Cylinder Stroke29.92 in (759.5 mm)
Ejector Cylinder Stroke (Stage 1/ Stage 2)38.32 in (973.5 mm)
Steering Circuit (@ High Idle)76.08 gal/min (288 l/min)
Implement Circuit (@ High Idle)517 l/min (517 l/min)
Cushion Hitch Circuit19.54 gal/min (74 l/min)
Secondary Steering Circuit14.52 gal/hr (55 l/hr)
Relief Valve - Steering Circuit1959 psi (13500 kPa)
Relief Valve - Implement Circuit1999 psi (13780 kPa)
Compensator Settings - Cushion Hitch Circuit3002 psi (20700 kPa)
Fuel Tank430 gal (US) (1628 l)
Crankcase8.9 gal (US) (34 l)
Transmission31.9 gal (US) (121 l)
Differential44 gal (US) (168 l)
Final Drive - Each7.8 gal (US) (30 l)
Cooling System16.6 gal (US) (63.2 l)

Benefits and Features

Operator Comfort

  • Ergonomic layout with plenty of room to work.
  • Fatigue fighting low-effort controls with convenient auto-kickouts and detents
  • Air suspension Cat Comfort Seat adjusts and rotates for more comfortable machine operation
  • HVAC, defroster, radio ready are standard

Productivity

  • Excellent visibility to bail, cutting edge and bowl
  • Transmission hold maintains gear selection for optimum loading performance
  • Dual throttle pedals for independent front and rear engine control
  • Single joystick control replaces three implement levers in previous models
  • Differential lock improves traction, reducing tire slip, wear, and operating costs
  • Engine compression brakes

Safety

  • Hand rails strategically placed for three points of contact
  • Seat adjusts for best visibility and access to controls; integrated seat belt
  • ROPS/FOPS integrated into cab structure
  • Front and rear windshield wipers
  • Optional secondary steering helps maneuver the machine when primary steering is inoperable
  • Four braking systems: primary, secondary, parking and engine compression brakes

Instruments

  • 1) Bowl (up/down), 2) Ejector (forward/back), 3) Thumb rocker switch, apron, 4) Transmission hold, 5) Cushion hitch, Trigger switch (not shown) bail control
  • Simple gauge cluster is easy to read
  • 657G dash can display either front or rear engine data
  • Backlit switches are close at hand
  • Messaging alerts technicians and operator to service needs

Technology

  • U.S. EPA Tier 4 Final, EU Stage V emissions compliant
  • Controlled combustion using proven systems, components
  • Cross flow cylinder heads for clean air, better circulation
  • Delivers fuel at the right time and pressure
  • Rate shaping manages emissions in the combustion cycle

Cat C18 Engine - Tractor

  • Excellent power density, load response across the curve
  • High compression ratio improves cold start and performance
  • MEUI fuel injection matches quantity and timing to load
  • Matched to the high efficiency torque converter and electronically controlled power shift transmission, it has the torque rise to power through tough material and provide years of dependable service

Cat C15 Engine - Scraper

  • Strong block and head - 18:1 compression ratio improves cold start performance
  • Coolant, oil flow design improves heat transfer for durability
  • Articulated two-piece piston with forged steel crown improves thermal stability and strength
  • ADEM A4 ECM cold start strategy protects the engine, reduces white smoke and warm up time
  • Automatic altitude compensation
  • Mechanical Hydraulic Electronic Unit Fuel Injectors (MEUI) improve combustion with precise injection and atomization

Engine Speed Lock

Allows the operator to maintain a given engine speed without using the accelerator pedal.

Planetary Powershift Transmission Is Electronically Controlled

  • Tractor and Scraper gears 1-2 - converter drive for increased torque, tractor and scrapers gears 3-8 - direct-drive for drive train efficiency.
  • Transmission Hold maintains converter drive for max rimpull, or holds current gear for best control
  • Programmable Top Gear manually sets top gear available (3rd-8th) to match conditions or speed
  • Neutral Coast Inhibitor prevents power train overspeeding by synchronizing engine rpm, pump lubrication and drive train speed, preventing under-lubrication
  • Engine compression brakes reduces service brake wear and enhances machine control

Final Drives

  • Outboard-mounted, planetary design reduces torque loads within the power train
  • Double-row roller bearings and Duo-Cone™ seals assure reliability
  • Differential Lock improves traction in slippery conditions, reducing tire wear

Brake Performance

  • Wide brake shoes and brake drums improve brake performance and reduce brake and drum wear
  • Separate front and rear circuits. Secondary brakes engage automatically if service pressure drops
  • Parking Brake features a spring-applied, hydraulic pressure released mechanism that operates the service brakes

Torque Converter

Increases rimpull and shortens load times, and eliminates engine stall to efficiently deliver power to the ground and move more dirt.

Benefits of Electronic Control Modules (ECMs)

ECMs (3 on the tractor, 2 on rear-powered scrapers) offer:

  • Better fuel economy by optimizing engine settings
  • Greater reliability with operator warnings if problems arise
  • Combining tractor and rear powered-scraper monitoring systems, easy access diagnostics, more durable components improves serviceability
  • Reduced exhaust smoke by optimizing the fuel/air ratio during cranking, starting and acceleration
  • Air filter restriction indicator alerts operator if filter exceeds allowable limit
  • Periodically raises engine rpm during low idle to keep the batteries fully charged

Combined Electronic Monitoring System (EMS III)

Monitors both the tractor and scraper status on the 657G; access fault codes from one location. The tractor and powered scraper use the same controller for parts commonality and easier servicing.

Product Link Ready

This wireless system lets the customer track location, service meter hours and machine health information. Can also issue alerts if the machine is operated beyond owner defined time and location limits.

Easy Access Diagnostics Means Faster Problem Solving

Diagnostic codes, via the Electronic Technician (Cat ET), and a radio call can often let the service technician know which tools, manuals, and possibly even replacement parts to bring.

Cushion Hitch

The electronically actuated cushion hitch has a parallelogram-type linkage for exceptional strength. Vertically mounted hydraulic cylinder transfers road shocks to nitrogen accumulators. Nitrogen accumulator absorbs and dampens road shocks, thus preventing these loads from being transmitted to the operator.

  • controlled oil flow dampens rebound oscillation
  • leveling valve applies pressure via an orifice to automatically center piston in the load cylinder
  • steel castings are used to eliminate many welded joints and increase strength
  • double-kingbolt design withstands high external forces and simplifies installation and removal

Lockout Switch

An operator-selectable lockout switch, located on the joystick, locks the cushion hitch down for improved cutting edge control when loading or dumping.

Bowl Design

Excellent productivity, improved draft arm protection, and better load retention. Low profile design offers less resistance to incoming materials, while cellular construction adds strength and dent resistance to bowl sides and floor.

Bulldozer Ejection System

Combines constant spreading control with minimum carryback.

Overflow Guard

An available overflow guard on the scraper bowl helps retain material, and limits spills onto the rear of the scraper.

Push-Loading

Where material types include rocky/abrasive material, or become traction-limited, push loading a 657G with a Cat D10 or D11 will optimize tire wear and productivity.

Cutting Edges and Cat Ground Engaging Tools (GET)

May be adjusted according to job conditions. Smooth and serrated cutting edges with available tip options can be applied to match job site conditions. For most efficient loading, use the thinnest cutting edge that provides satisfactory wear life and impact resistance.

Tandem Engines

Tandem engine machines improve cycle times on grades and in slippery underfoot conditions. Also improves the machine's loading characteristics in tough materials like clay.

Material Appetite

Well suited to handle a wide variety of material from clay to shot rock.

Bowl Capacity

High-capacity bowls, built longer and taller than earth-moving bowls, allow the 657G to achieve rated load in light weight coal.

Wheel Tractor-Scraper Benefits

  • High speed, self-loading productivity for stockpile and feeder management
  • Coal pile compaction
  • Bowl capacity 56 m³ (73 yd³) heaped
  • All-wheel drive allows the machine to work in poor underfoot conditions and operate on piles of loose coal

Combined Power Increases Production

Push-pull applies the power of four engines to a single cutting edge. The benefit is realized in tough-to-load material and fast loading of both machines. Push-pull applications have the potential to produce the lowest cost per unit volume, and a high rate of production.

Hydraulically Actuated Bail

The push-pull arrangement uses a hydraulically actuated bail and cushioned plate to push, and a hook that is attached to the rear of the scraper to pull.

Engine Service Points

  • Maintenance/service points grouped on the right side
  • Grouping fluid fill and check points, filters and sampling ports shortens maintenance times
  • Electronic Monitoring System (EMS) provides real-time information to the operator of system warnings
  • Electronic Technician (Cat ET) displays real-time system data to better inform the service technician

Implement Valve Relocation

The implement valve is relocated from the tractor to the top of the scraper draft tube, reducing the number of hoses and tubes crossing over the gooseneck. This reduces potential leak points and improves service access.

Scraper Electrical Harness and One Piece Power Block

The flexible ribbon wiring harness oscillates with the machine, and polyurethane boots offer better protection against the elements. The jumpstart receptacle and disconnect switch are integrated into a one-piece power block, with a lockable cover, for better electrical integrity and serviceability.

Electro-Hydraulic Implement Control Simplifies Serviceability

Removing the cab pilot valve and associated lines improves reliability and reduces noise. The high efficiency electro-hydraulic pilot oil filter provides cleaner oil for the pilot system.

Product Support

You will find nearly all parts at your dealer parts counter. Cat dealers use a world-wide computer network to find in-stock parts to minimize machine down time. Save money with genuine Cat Reman parts. You receive the same warranty and reliability as new products at substantial cost savings.

Operation

Better operating techniques can help maximize your machine investment. Cat dealers have resources to help you increase productivity, and Caterpillar offers certified operator training classes on most machines.

Machine Selection

Compare machines under consideration before purchase. Cat dealers can estimate component life, preventive maintenance cost, and the true cost of lost production.

Purchase

Consider the financing options available as well as day-to-day operating costs. Look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over time.

Maintenance Services

Talk to your dealer about the range of available maintenance services like S·O·SSM Analysis and Coolant Sampling. Repair option programs guarantee the cost of repairs up front.

Customer Support Agreements

Cat dealers offer a variety of product support agreements that can meet customers' specific needs. These plans can cover the entire machine, including attachments, to help protect your investment.

Replacement

Repair, rebuild or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.

Standard Equipment

  • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Alarm, backup
  • Alternator, 115 amp - tractor engine
  • Alternator, 65 amp - scraper engine
  • Batteries Tractor (4), 12V Maintenance Free, High Output
  • Batteries Scraper (4), 12V Maintenance Free, High Output
  • Electrical System, 24V
  • Lighting System - Tractor
  • Lighting System - Scraper
  • Starting Receptacle - tractor and scraper engines
  • Air Conditioner (includes heater and defroster)
  • Automotive style fuse panel with fuse puller
  • Lunch box platform with holding strap
  • Coat Hook
  • Cup holder
  • Diagnostic Connection Port (12V)
  • Dome Courtesy Light
  • Engine speed lock
  • Fan defroster
  • Gauge Group
  • Horn
  • Implement Control Joystick
  • Rearview Mirrors
  • Radio Ready
  • 2 radio openings, speakers, and 5-amp converter
  • ROPS Cab with Sound Suppression and Pressurization
  • Static Seatbelt, 2 piece
  • Scraper Engine Controls
  • Seat, Air Suspension, Cat Advanced Ride Management
  • Steering Wheel - tilt and telescoping
  • Storage Compartment
  • Transmission Hold
  • Windows - sliding side
  • Windshield - laminated glass
  • Windshield Wiper/Washer - front and rear
  • Wrist Rest/Grab Handle
  • Tractor
  • Scraper