825K Introduction 825K Introduction


Engine ModelCat® C15 ACERT™
Net Power405 HP (302 kW)
Operating Weight78326 lb (35528 kg)
FrontPlanetary – Fixed
Cat Soil Compactors are designed with durability built in, ensuring maximum availability through multiple life cycles. With optimized performance and simplified serviceability, our machines allow you to operate more efficiently and safely. Representing a long-standing commitment to quality and performance, this rugged, powerful machine is designed and built for heavy-duty compaction and dozing operations. Focused on helping our customers succeed, we have continued to build upon each new series. The 825K continues our legacy of reliability, performance, safety, operator comfort, serviceability, and efficiency.


Engine ModelCat® C15 ACERT™
Net Power405 HP (302 kW)
Operating Weight78326 lb (35528 kg)
FrontPlanetary – Fixed
Oscillation Angle±8°
RearPlanetary – Oscillating
Blade Tilt Angle - Left - Hydraulic5.4°
Blade Tilt Angle - Left - Mechanical4.1°
Blade Tilt Angle - Left Full10.1°
Blade Tilt Angle - Right - Hydraulic6.3°
Blade Tilt Angle - Right - Mechanical5.1°
Blade Tilt Angle - Right Full10.8°
Blade Tip Angle - Back7.5°
Blade Tip Angle - Forward7.3°
Blade Tip Angle - Total14.8°
Height - Including Cutting Edge3.4 ft (1032 mm)
Maximum Depth of Cut1.97 ft (602 mm)
Maximum Lift Above Ground3.14 ft (958 mm)
Moldboard - Length14.4 ft (4390 mm)
Total Tilt Adjustment2.9 ft (890 mm)
Width - Over End Bits15.18 ft (4628 mm)
Parking BrakeDrum and Shoe, Spring Applied, Hydraulic Released
Machine Sound Level (ISO 6395)113 dB(A) (113 dB(A))
Operator Sound Level - ISO 639673 dB(A) (73 dB(A))
Machine Sound Level (ISO 6395)110 dB(A) (110 dB(A))
Operator Sound Level - ISO 639672 dB(A) (72 dB(A))
Centerline of Rear Axle to Edge of Counterweight9.3 ft (2830 mm)
Ground Clearance1.6 ft (492 mm)
Ground Clearance - Bumper2.7 ft (810 mm)
Height - ROPS/Canopy13.3 ft (4059 mm)
Height - Top of Beacon14.4 ft (4381 mm)
Height - Top of Exhaust Pipe14.1 ft (4290 mm)
Height - Top of Hood10.4 ft (3162 mm)
Hitch to Centerline of Front Axle6.1 ft (1850 mm)
Length - With Blade on Ground28.1 ft (8561 mm)
Turning Radius - Inside of Push Arms8.6 ft (2627 mm)
Wheel Base12.1 ft (3700 mm)
Width - Over Wheels11.98 ft (3650 mm)
Bore5.4 in (137.2 mm)
Displacement927.6 in³ (15.2 l)
EmissionsMeets U.S. EPA Tier 4 Final/EU Stage IV emission standards or meets U.S. EPA Tier 3/EU Stage IIIA equivalent emission standards
Gross Power435 HP (324 kW)
High Idle Speed2300 r/min (2300 r/min)
Low Idle Speed800 r/min (800 r/min)
Maximum Altitude - Without Derating (Tier 3 Final/Stage IIIA Equivalent)9098 ft (2773 m)
Maximum Altitude - Without Derating (Tier 4 Final/Stage IV)9298 ft (2834 m)
Maximum Net Torque - 1,300 rpm1478.8 lb/ft (2005 N·m)
Net Power - Converter Drive - Gross Power435 HP (324 kW)
Net Power - Converter Drive - Torque Rise8.5%
Net Power - Direct Drive - Gross Power412 HP (307 kW)
Net Power - Direct Drive - Torque Rise33%
Rated Power (Net ISO 9249)405 HP (302 kW)
Rated Power (Net SAE J1349)405 HP (302 kW)
Stroke6.7 in (171.4 mm)
Cylinders, Double Acting - Lift, Bore and Stroke120 mm × 1070 mm (4.7 in × 42.1 in)
Cylinders, Double Acting - Tilt, Bore and Stroke95.25 mm × 216 mm (3.75 in × 8.5 in)
Main Relief Pressure3495 psi (24100 kPa)
Maximum Supply Pressure3495 psi (24100 kPa)
Pump Flow at 1,800 rpm30.9 gal/min (117 l/min)
Bore4.5 in (114.3 mm)
Maximum System Flow170 L/min @ 1,800 rpm (44.9 gal/min @ 1,800 rpm)
Steering Pressure Limited3481 psi (24000 kPa)
Steering System - CircuitDouble Acting – End Mounted
Steering System - PumpPiston – Variable Displacement
Stroke22.7 in (576 mm)
Vehicle Articulation Angle86 degrees
Operating Weight - Tier 3 Final/Stage IIIA Equivalent77340 lb (35081 kg)
Operating Weight - Tier 4 Final/Stage IV78326 lb (35528 kg)
Cooling System30.6 gal (US) (116 l)
Diesel Exhaust Fluid Tank (Tier 4 Final/Stage IV)8.5 gal (US) (32 l)
Differential - Final Drives - Front26.4 gal (US) (100 l)
Differential - Final Drives - Rear29.1 gal (US) (110 l)
Engine Crankcase9 gal (US) (34 l)
Fuel Tank206.6 gal (US) (782 l)
Hydraulic Tank Only35.4 gal (US) (134 l)
Transmission17.4 gal (US) (66 l)
Transmission TypePlanetary – Powershift – ECPC
Travel Speeds - Forward - First3.4 mile/h (5.5 km/h)
Travel Speeds - Forward - Second6 mile/h (9.7 km/h)
Travel Speeds - Forward - Third10.7 mile/h (17.2 km/h)
Travel Speeds - Reverse - First3.9 mile/h (6.2 km/h)
Travel Speeds - Reverse - Second6.9 mile/h (11.1 km/h)
Travel Speeds - Reverse - Third12.2 mile/h (19.7 km/h)
Drum Diameter4.3 ft (1299 mm)
Drum Width3.7 ft (1125 mm)
Outside Diameter5.5 ft (1672 mm)
Tips per Wheel65
Weight16167 lb (7333 kg)
Width - Over Drums11.98 ft (3650 mm)

Benefits and Features

The Autoshift mode, when active, allows the machine to automatically upshift or downshift based on machine speed and torque, optimizing performance and thus saving fuel. This feature can be easily enabled or disabled on the soft keypad.

Decelerator Pedal

The left pedal acts as a brake, transmission neutralizer and an engine decelerator to override the engine speed selected by the throttle lock. This enables the operator to slow down when the throttle lock is engaged and to return to throttle lock without pressing a resume or set button again. This aids in maneuvering around trucks, tractors or any other obstacle.

Steering and Transmission Integrated Control System (STIC™)

Experience maximum responsiveness and control with STIC that combines directional selection, gear selection and steering into a single lever.

  • Simple side-to-side motion turns machine right or left, minimizing operator movements
  • Easy to operate finger controlled gear selection
  • Smoother, faster cycles help reduce operator fatigue through the use of low effort integrated controls

Steering System

Confident machine operation starts with precise machine control enabled by the 825K's load sensing hydraulic steering system.

  • Increase efficiency with our variable displacement piston pumps
  • Achieve precise positioning for easy loading in tight areas with 43 degrees each way of steering articulation
  • Enhance operator comfort with integrated steering and transmission control functions

Electro Hydraulic Controls

Operators increase productivity with our responsive implements feature.

  • Operate comfortably through electronically controlled hydraulic cylinder stops
  • Handle easy-to-use soft detent controls

The 825 is specifically designed and made with purpose built structures to remain safe and durable for the long run. Advanced design, materials and robotic welding contribute to increased durability and overall machine strength.

Robust Structures

Your bottom line is improved by highly durable structures that achieve multiple life cycles and withstand the toughest loading conditions.

  • Full box-section rear frame resists torsional shock and twisting forces
  • Heavy-duty steering cylinder mounts efficiently transmit steering loads into the frame
  • Axle mounting has been optimized for increased structural integrity

Cat Planetary Powershift Transmission

Building your success begins with a best-in-class transmission.

  • Consistent, smooth shifting and efficiency through integrated electronic controls that utilize Single Clutch Speed Shifting (SCSS).
  • Long life and reliability through heat treat gear and metallurgy.
  • Three forward and three reverse speeds to match your application.

Cat Torque Converter (TC) with Lock-up Clutch

  • Eliminates TC losses while lowering system heat
  • Improves travel speeds
  • Increases fuel efficiency

Cat C15 ACERT Engine

The Cat C15 ACERT engine is built and tested to meet your most demanding applications. Two engine options are available that meet Tier 4 Final/Stage IV emission standards or Tier 3/Stage IIIA equivalent emission standards.

  • Fully integrated electronic engine controls works in concert with the entire machine to make your fuel go farther.
  • Use less fuel idling with Engine Idle Shutdown.
  • Maximized durability with Delayed Engine Shutdown.

Chevron Tamping Tip Design

The modified chevron tamping wheel tip design provides greater ground pressure, more compaction, excellent traction and a smooth ride.


Compaction is achieved from the bottom of the lift to the top. The tapered tips walk out of the lift without “fluffing” the soil. The top of the lift is compacted and the surface is relatively smooth and sealed so hauling units are able to maintain a high speed when traveling over the fill. The 825K travel speed allows four forces of compaction: pressure, manipulation, impact and vibration. Since the 825K can also spread fill, the number of spreader tractors may be able to be reduced.

Standard Tips

Standard tips are used in typical soil compaction applications where compaction specification requirements are 95-100 percent Standard Proctor.

Symmetrical Tamping Tip Pattern

Equal compaction in forward or reverse is the result of the symmetrical tamping tip pattern. Tips are full perimeter and replaceable. The tip is welded to a base assembly, which then is welded directly to the drum.

Cleaner Bars

Each wheel has two cleaner bars to keep the drums free of carryover dirt, regardless of rolling direction so efficiency is maximized.

Adjustable Cleaner Bar Tip

The adjustable cleaner bar tips are heat-treated and direct hardened, cutting edge steel to increase wear life, which translates into lower operating costs.

Your operators can work more efficiently and stay comfortable with our customer-inspired cab features.

Entry and Exit

Enter and exit the cab easily and safely with these newly designed, ergonomic features.

  • Fold up STIC steer/armrest
  • Reduced access stairway angles
  • Standard stairway lighting

Cat Comfort Series III Seat

Enhance comfort and help reduce operator fatigue with Cat Comfort Series III seat.

  • Mid back design and extra thick, contoured cushions
  • Air suspension system
  • Easy-to-reach seat levers and controls for six way adjustments
  • Seat-mounted implement pod and STIC steer that moves with the seat
  • 76 mm (3 in) wide retractable seat belt

Control Panel

Ergonomic placement of switches and information display keep your operators comfortable all day every day.

  • Large backlit membrane switches feature LED activation indicators
  • Switches feature ISO symbols for quick function identification
  • Two position rocker switch activates the electro hydraulic park brake


Your operator's productivity is enhanced with our clean, comfortable cab environment.

  • Experience reduced vibrations from isolation cab mounts and seat air suspension.
  • Maintain desired cab temperature with automatic temperature controls.
  • Pressurized cab with filtered air
  • Reduced sound levels
  • Convenient floor storage tray/lunch box

Cat Connect makes smart use of technology and services to improve your job site efficiency. Using the data from technology-equipped machines, you'll get more information and insight into your equipment and operations than ever before. Cat Connect technologies offers improvements in these key areas: Equipment Management – increase uptime and reduce operating costs. Productivity – monitor production and manage job site efficiency. Safety – enhance job site awareness to keep your people and equipment safe.

COMPACT Technologies

COMPACT technologies combine advanced compaction measurement, in-cab guidance and reporting capabilities to help you consistently meet compaction targets fast, uniformly, and in fewer passes – saving on fuel and the cost of unnecessary rework.

Cat Compaction Control

The factory Cat Compaction Control system uses Machine Drive Power (MDP) technology to measure rolling resistance and correlates it with soil stiffness. MDP works in both cohesive or granular soils. Optional 3D mapping system maps compaction measurements to the precise location the operator is working, providing a real-time view of progress, and a record of compaction uniformity.

LINK Technologies

LINK technologies wirelessly connect you to your equipment, giving you valuable insight into how your machine or fleet is performing so you can make timely, fact-based decisions that can boost job site efficiency and productivity.

Product Link™/VisionLink®

Product Link is deeply integrated into your machine, giving you access to timely information like machine location, hours, fuel usage, idle time and event codes via the online VisionLink user interface can help you effectively manage your fleet and lower operating costs.

DETECT Technologies

DETECT technologies help keep people and equipment safe by enhancing operator awareness of the work area around working equipment and by monitoring and reporting unsafe conditions, like avoidance zones.

Rear Vision Camera

The standard rear vision camera greatly enhances visibility behind the machine to help the operator work more productively. Work with greater confidence and at peak potential while keeping people and assets safe.

We are constantly improving our products in an effort to provide a safe work environment for the operator and those who work on your job site. The 825K features an all new stairway access to the cab and key maintenance and service points.

Machine Access

  • Left and right hand stairs are angled to enhance safety for operators getting on and off the 825K.
  • Continuous pass-through with handrails and non-skid surfaces with toe kicks are designed into the service areas.
  • Maintain three points of contact at all times through ground level or platform accessible service areas.


  • Optional rearview camera with in-cab monitor increases operator awareness around the machine.
  • Standard cab mounted LED warning strobes

Operator Environment

  • Reduced vibrations to the operator with isolated cab mounts and seat mounted implement and steering controls.
  • Low interior sound levels
  • Pressurized cab with filtered air
  • Standard 76 mm (3 in) seat belts on the operator seat

Reducing the Impact to the Environment

The 825K is designed and built with sustainability in mind.

  • Engine Idle Shutdown can help you save fuel by avoiding unnecessary idling.
  • Reduce waste to the environment with our maintenance free batteries.
  • Built for multiple lives, the Cat 825 is one of the most rebuilt products to achieve the second and third life to get the most value from your investment. To assist with maximizing machine life, Caterpillar provides a number of sustainable options such as our Reman and Certified Rebuild programs. In these programs, reused or remanufactured components can deliver cost savings of 40 to 70 percent, which lowers operating cost while benefiting the environment.
  • Caterpillar offers retrofit packages to bring new features to older machines, maximizing your resource. And, when you go through the Cat Certified Rebuild program, these retrofit kits are part of the rebuild process.

We can help you succeed by ensuring your 825K has design features to reduce your downtime.

  • Safe and convenient service with ground level or platform access and grouped service points.
  • Swing-out doors on both sides of the engine compartment provide easy access to important daily service checks.
  • Ecology drains for ease of service and prevention of spills.
  • Reduce downtime with VIMS™ system notifications so your operators and technicians can resolve any problems before failure.
  • Quick visual inspection and minimize fluid contamination with sight gauges.
  • Swing out fuel, hydraulic oil coolers and condenser for easy access cleanout.
  • Ground level power service center with electrical disconnect, emergency engine shutdown, and stairway light switch.
  • Lighting inside the engine compartment improves visibility to service points.

Legendary Cat Dealer Support

A valued partner, your Cat dealer is available whenever you need them.

  • Preventive maintenance programs and guaranteed maintenance contracts
  • Best-in-class parts availability
  • Improve your efficiency with operator training
  • Genuine Cat Remanufactured parts

Data from customer machines show Cat Soil Compactors are among the most fuel efficient machines in the industry. Several features contribute to this excellent fuel efficiency:

  • ACERT Engine – Advanced engine controls maximizes power and efficiency.
  • Engine Idle Shutdown – Automatic engine and electrical system shutdown conserves fuel.
  • Lockup Torque Converter – Transfers more power to the ground and optimizes fuel efficiency in all applications.
  • Single Clutch Speed Shifting (SCSS) – All new SCSS transmission controls provides greater momentum on grades and fuel savings by carrying that momentum through the shift points.
  • Fuel Tank Capacity minimum of 12 hours operation depending on the application.

Standard Equipment

  • Air to air aftercooler
  • Alarm, back-up
  • 12V power port for mobile phone or laptop connection
  • Wheels, tamping tips
  • Guard, driveshaft
  • Bulldozer straight blade, hydraulics, and linkage are included in the base machine
  • Antifreeze, premixed 50% concentration extended life (–34° C/–29° F)
  • Cleaner bars with teeth

Optional Equipment

  • Camera, rear vision
  • Compaction control, basic
  • Antifreeze, –50° C (–58° F)
  • Heater, engine coolant, 120V
  • Film (ANSI) (Tier 4 Final/Stage IV)