988K 50 Year Legacy 988K 50 Year Legacy
988K Introduction 988K Introduction
Meet the Pros: Randy Aneloski, Cat® Large Wheel Loaders Meet the Pros: Randy Aneloski, Cat® Large Wheel Loaders
Cat® K Series Large Wheel Loader Operator Training Cat® K Series Large Wheel Loader Operator Training

SPECS SUMMARY

Net Power541 HP (403 kW)
Engine ModelCat® C18 ACERT™
Bore5.7 in (145 mm)
Stroke7.2 in (183 mm)
Cat® Large Wheel Loaders are designed with durability built in, ensuring maximum availability through multiple life cycles. With optimized performance and simplified serviceability, our machines allow you to move more material efficiently and safely at a lower cost per ton. Introduced in 1963, the 988 has been the industry leader for 50 years. Focused on helping our customers succeed, we have continued to build upon each new series. The 988K continues our legacy of reliability, performance, safety, operator comfort, serviceability, and efficiency.


Specifications

Net Power541 HP (403 kW)
Engine ModelCat® C18 ACERT™
Bore5.7 in (145 mm)
Stroke7.2 in (183 mm)
Displacement1105 in³ (18.1 l)
Torque Rise58 % (58 %)
Rated Speed1,700 rpm
EmissionsU.S. EPA Tier 4 Final/EU Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Gross - ISO 14396580 HP (432 kW)
Net Power - SAE J1349541 HP (403 kW)
Peak Power Speed1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396580 HP (432 kW)
Peak Power Speed - 1,500 rpm - Gross - SAE J1995588 HP (439 kW)
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349541 HP (403 kW)
Peak Torque - 1,200 rpm2104 lb/ft (2852 N·m)
Operating Weight112574 lb (51062 kg)
Bucket Capacity Range4.7-13 m3 (6.2-17 yd3)
Cat Truck Match - High Lift773-775
Cat Truck Match - Standard770-772
Rated Payload - Loose Material16 t (14.5 t)
Rated Payload - Quarry Face12.5 t (11.3 t)
Transmission TypeCat planetary power shift
Forward - 14 mile/h (6.5 km/h)
Forward - 27.2 mile/h (11.6 km/h)
Forward - 312.7 mile/h (20.4 km/h)
Forward - 421.6 mile/h (34.7 km/h)
Reverse - 14.7 mile/h (7.5 km/h)
Reverse - 28.3 mile/h (13.3 km/h)
Reverse - 314.4 mile/h (23.2 km/h)
Direct Drive - Forward 1Lock-up disabled
Direct Drive - Forward 27.8 mile/h (12.5 km/h)
Direct Drive - Forward 313.9 mile/h (22.3 km/h)
Direct Drive - Forward 424.4 mile/h (39.3 km/h)
Direct Drive - Reverse 15 mile/h (8 km/h)
Direct Drive - Reverse 28.9 mile/h (14.3 km/h)
Direct Drive - Reverse 315.8 mile/h (25.5 km/h)
Cylinders, Double Acting - Lift, Bore and Stroke210 mm × 1050 mm (8.7 in × 41.3 in)
Cylinders, Double Acting - Tilt, Bore and Stroke269 mm × 685 mm (8.7 in × 27 in)
Lift/Tilt SystemVariable displacement piston
Lift/Tilt System - CircuitEH- Positive Flow Control, Flow Sharing
Maximum Flow13.7 gal/min (52 l/min)
Maximum Flow at 1,400-1,860 rpm153 gal/min (580 l/min)
Pilot SystemVariable displacement piston
Relief Valve Setting551 psi (3800 kPa)
Relief Valve Setting - Lift/Tilt4757 psi (32800 kPa)
Fuel Tank188 gal (US) (712 l)
Cooling System31.7 gal (US) (120 l)
Crankcase15.9 gal (US) (60 l)
Transmission31.7 gal (US) (120 l)
Hydraulic System - Tank Only63.4 gal (US) (240 l)
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only)8.7 gal (US) (33 l)
Differential - Final Drives - Front49.1 gal (US) (186 l)
Differential - Final Drives - Rear49.1 gal (US) (186 l)
Hydraulic System Factory Fill125.5 gal (US) (475 l)
Bucket Capacities4.7-13 m3 (6.2-17 yd3)
FrontFixed
RearTrunnion
Oscillation Angle13°
BrakesSAE J1473 OCT90, ISO 3450:1992
Maximum Flow71.3 gal/min (270 l/min)
Relief Valve Setting - Steering4351 psi (30000 kPa)
Steering Cycle Times - High Idle3.4 s (3.4 s)
Steering Cycle Times - Low Idle5.6 s (5.6 s)
Steering System - CircuitPilot, load sensing
Steering System - PumpPiston, variable displacement
Total Steering Angle86°
Dump2.2 s (2.2 s)
Lower Float Down3.5 s (3.5 s)
Rack Back4.5 s (4.5 s)
Raise8 s (8 s)
Total Hydraulic Cycle Time - Empty Bucket18.2 s (18.2 s)
Machine Sound Level (ISO 6395)111 dB(A) (111 dB(A))
Operator Sound Level (ISO 6396)72 dB(A) (72 dB(A))
Machine Sound Level (ISO 6395)109 dB(A) (109 dB(A))
Operator Sound Level (ISO 6396)72 dB(A) (72 dB(A))
Coolant (Validated by Test Cell Fill Quantities)33 gal (US) (125 l)
Transmission - Validated by Test Cell Fill Quantities29 gal (US) (110 l)
Machine Sound Level (ISO 6395)112 dB(A) (112 dB(A))
Operator Sound Level ( ISO 6396)73 dB(A) (73 dB(A))
Machine Sound Level (ISO 6395)110 dB(A) (110 dB(A))
Operator Sound Level (ISO 6396)72 dB(A) (72 dB(A))

Benefits and Features

Cat C18 ACERT™ Engine

The Cat C18 ACERT engine is built and tested to meet your most demanding applications while meeting Tier 4 Final/Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II 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.

Cat Planetary Powershift Transmission

Featuring all new Advanced Productivity Electronic Control Shifting (APECS) transmission controls provides greater momentum on grades and fuel savings by carrying that momentum through the shift points.

Impeller Clutch Torque Converter (ICTC)

Enable your operators to maximize efficiency by varying machine rimpull while putting more horsepower to hydraulics.

  • Reduced tire wear
  • Enables full throttle shifts for faster cycle times
  • Provides smooth approach to the dump target for less spillage and faster cycle times.

Cat Torque Converter with Lock-up Clutch

  • Eliminates TC losses while lowering system heat
  • Improves travel speeds
  • Reduces cycle times in load and carry operations

Economy Mode

Enabling maximum productivity and efficiency, all day every day. The 988K systems work hard to save you fuel through advanced technologies. Utilizing On Demand Throttle, operators maintain normal operation with the left pedal and implements while the 988K manages the engine speed.

  • Provides similar control and feel to our traditional throttle lock feature.
  • Efficiency of manual throttle and the ergonomics of throttle lock operation.
  • Reduced fuel consumption by up to 20% compared to the 988H.

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.
  • Lower hitch pin, frame plate, and bearing size have been increased for longer life.

Lift Arms

  • Excellent visibility to the bucket edges and work area through a Z-bar design.
  • High load stresses are absorbed by the solid steel lift arms.
  • Enhance strength in key pin areas through the use of one piece castings.
  • Stress relieved lift arms increase durability and lengthen time to repair.

Front Linkage

To ensure long life and reliability, the linkage pin joints feature a greased pin design with an auto lube system attachment available from the factory.

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 and less operator fatigue through the use of low effort integrated controls.

Cat Planetary Powershift Transmission

Building your success begins with a best-in-class transmission designed specifically for mining applications.

  • Consistent, smooth shifting and efficiency through integrated electronic controls that utilize Advanced Productivity Electronic Control Strategy (APECS).
  • Long life and reliability through heat treat gear and metallurgy.
  • Four forward and three reverse speeds to match your application.

Cat C18 ACERT Engine

Durability and efficiency at the heart of your 988K comes from the Cat C18 ACERT Engine. Optimum performance is built in through the use of a 6 cylinder, four-stroke design.

  • Optimized performance and quick engine response with an electronic control module.
  • Reliable efficiency with complete control over injection timing, duration and pressure with Mechanically Actuated Electronic Unit Injection (MEUI™).
  • Extended engine life and improved fuel efficiency with reduced rated speed.
  • Designed to meet Tier 4 Final/Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent emission standards.

Impeller Clutch Torque Converter (ICTC) and Rimpull Control System (RCS)

Lower your cost per ton utilizing advanced ICTC and RCS for modulated rimpull.

  • Reduce tire slippage and wear by modulating rimpull from 100 to 25 percent while depressing left pedal. After 25 percent rimpull is achieved the left pedal applies the brake.
  • Reduce the potential for wheel slippage without reducing hydraulic efficiency with RCS.
  • Improve fuel efficiency in certain applications with our lock-up clutch torque converter providing direct drive.

Positive Flow Control Hydraulics

Increase efficiency through our Positive Flow Control (PFC) Hydraulic System. PFC has concurrent pump and valve control. By optimizing pump control, hydraulic oil flow is proportionate to implement lever movement.

  • Fast, productive cycles are enabled by the fully variable implement pump.
  • Increase bucket feel and control through increased hydraulic response.
  • Consistent performance and efficiency with lower system heat.
  • Full hydraulic flow down to 1,400 engine rpm enabled by flow sharing technology.

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.
  • Conveniently set automatic implement kickouts from inside the cab.

Steering System

Confident loader operation starts with precise machine control enabled by the 988K'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 of steering articulation.
  • Enhance operator comfort with integrated steering and transmission control functions.

Filtration System

Benefit from extended performance and reliability of your hydraulic system with our advanced filtration system.

  • Case drain screens.
  • Hydraulic oil cooler return filter.
  • Pilot filter.
  • Return screens inside hydraulic tank.
  • Axle oil cooler screens if equipped.

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 helps 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.

Environment

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

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

Integrated electronics provide flexible levels of information to both the site and the operator. This integration creates a smart machine and more informed operator, maximizing the productivity of both.

Information Display

We have worked hard to help our customers and operators perform at their best through our newly upgraded touch screen information display.

  • Intuitive operation and easy navigation with our enhanced user interface.
  • Decrease service time by keeping operators informed about machine systems.
  • Quick on-the-go weighing with the Cat Production Measurement.

Cat Product Link™

Take the guesswork out of asset management with Product Link remote monitoring.

  • Remote access to information through the easy-to-use VisionLink® interface.
  • Maximize uptime by staying informed on machine systems and diagnostic codes.
  • Track machine with utilization, fuel usage, and payload summaries.
  • Stay up to date on machine location, service meter hours, and reporting status.

Vital Information Management System (VIMS™)

Connect directly to the machine for access to a wide range of sensor information and enhanced machine data.

  • Create productivity reports with payload and work cycle segmentation.
  • Identify operator training needs through productivity data.
  • Detailed data logging of machine parameters and diagnostic codes.
  • Track machine sensor information with trend analysis and histograms to monitor machine health.

We can help you succeed by ensuring your 988K 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 spilling potential environmental contaminants.
  • Reduce downtime with VIMS system notifications so your operators and technicians can resolve any problems before failure.
  • Ground level access to transmission control valves.

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.

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.

Machine Access

  • Left and right hand stairs with 45 degree angle enhance safety for operators getting on and off the 988K.
  • Continuous walkway with non-skid surfaces are designed into the service areas.
  • Maintain three points of contact at all times through ground level or platform accessible service areas.

Visibility

  • Optional heated mirrors ensure enhanced visibility for safe operation.
  • Standard Cat Vision or optional Cat Detect with radar increase operator awareness around the machine.
  • Optional HID or LED lights provide excellent workspace visibility.
  • Optional cab mounted LED warning beacons.

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

Sustainability is designed and built into our 988K's features.

  • Burns up to 20% less fuel than the previous model to minimize your carbon footprint.
  • Engine Idle Shutdown can help you save fuel by avoiding unnecessary idling.
  • Reduce waste with our maintenance free batteries.
  • Built for multiple lives, the Cat 988 is one of the most rebuilt products. 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.

Efficient Combination

For full truck payloads with minimum loading time, an efficient loading/hauling system starts with a perfect match. Cat wheel loaders are matched with Cat off-highway trucks to maximize volume of material moved at the lowest operating cost per ton. The 988K equipped with the standard linkage will pass match the 770 (36 tonnes/40 tons) in 3 passes and the 772 (45 tonnes/50 tons) in 4 passes. Equipped with a high lift linkage the 988K is capable of loading a 773 (56 tonnes/61.7 tons) in 5 passes and the 775 (64 tonnes/70 tons) in 6 passes.

Enhance the productivity of your loader and protect your investment in buckets with our Ground Engaging Tools (GET). Your knowledgeable Cat dealer will work with you to understand your application and needs for the GET that is best for you.

Performance Series Buckets

Performance Series Buckets feature an optimized profile maximizing material retention and minimizing dig time, translating into significant productivity and fuel efficiency improvements. All 988K buckets are manufactured with the Performance Series design.

Rock Bucket

Applications: Face loading tightly compacted pit materials.

General Purpose Bucket

Applications: Loading loose, stockpiled material.

GET Options

Multiple GET options are available to customize your 988K to your application, such as:

  • Sidebar protectors.
  • General duty and penetration tips.
  • Standard and half arrow segments.

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

  • Performance Series Buckets - Deliver faster fill times and better material retention, ultimately reducing cycle times while improving productivity and fuel efficiency.
  • Positive Flow Control Hydraulics - Provides only the hydraulic flow required by the implement and steering systems for improved fuel efficiency and greater rimpull.
  • ACERT Engine - Advanced engine controls maximizes power and efficiency.
  • Economy Mode - Featuring On Demand Throttle, Economy Mode optimizes power for maximum fuel savings with minimal impact on production.
  • Engine Idle Shutdown - Automatic engine and electrical system shutdown conserves fuel.
  • Lock up Torque Converter - Transfers more power to the ground and optimizes fuel efficiency in all applications.
  • Advanced Productivity Electronic Control Strategy (APECS) - All new APECS transmission controls provides greater momentum on grades and fuel savings by carrying that momentum through the shift points. Machine configuration, operator technique, and job site layout can impact fuel consumption.
  • Machine Configuration - Select the correct work tool and tire type based on machine application. Ensure proper inflation pressures. Utilize the Economy Mode setting for maximum efficiency.
  • Job Site Layout - Spot loading targets in the right position. Avoid traveling more than 1.5 tire revolutions during truck loading cycles. Reduce transport distance for load and carry cycles by optimizing job site layout.
  • Loading Bucket - Load in first gear. Raise and tilt bucket quickly and do not use a “pumping” motion. Avoid lift lever detent and use impeller clutch.
  • Loading Truck or Hopper - Do not raise the work tool any higher than necessary. Keep engine rpm low and unload in controlled manner.
  • Idle - Set the parking brake to engage Engine Idle Management System.

Standard Equipment

  • Alarm, back-up
  • Graphical Information Display, displays real time operating information, performs calibrations and customizes operator settings
  • Brakes, oil-cooled, multi-disc, service/secondary
  • Automatic bucket lift kickout/positioner

Optional Equipment

  • –50° C (–58° F) antifreeze
  • Cab precleaner
  • Front and rear roading fenders