988K XE Wheel Loader



Technical Specifications
Benefits and Features
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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 over 50 years, built on a legacy of reliability, performance, safety, operator comfort, serviceability, and productivity. The 988K XE brings improved sustainability and maximum efficiency to this machine platform.

Net Power - SAE J1349 538 HP
Engine Power - ISO 14396 580 HP
Engine Model Cat® C18 ™
Gross Power - SAE J1995 588 HP
Rated Speed 1,700 rpm
Peak Power Speed 1,500 rpm
Emissions U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014
Bore 5.7 in
Stroke 7.2 in
Displacement 1105 in³
Peak Torque - 1,200 rpm - SAE J1995 2230 ft·lbf
Torque Rise 58%
Operating Specifications
Operating Weight 116362 lb
Operating Weight - Standard 116362 lb
Operating Weight - High Lift 119618 lb
Rated Payload - Standard (Quarry Face) 12.5 ton (US)
Rated Payload - Loose Material (Standard) 16 ton (US)
Bucket Capacity Range 4.7-13 m3 (6.2-17 yd3)
Bucket Capacities 4.7-13 m3 (6.2-17 yd3)
Transmission Type Cat switched reluctance electric drive
Forward 1 (virtual) 4.3 mile/h
Forward 2 (virtual) 7 mile/h
Forward 3 (virtual) 13.8 mile/h
Forward 4 (virtual) 20 mile/h
Reverse 1 (virtual) 4.3 mile/h
Reverse 2 (virtual) 7 mile/h
Reverse 3 (virtual) 17.5 mile/h
Hydraulic System - Lift/Tilt
Lift/Tilt System - Circuit EH-Positive Flow Control, Flow Sharing
Lift/Tilt System - Pump Variable displacement piston
Maximum Flow at 1,400-1,600 rpm 153 gal/min
Relief Valve Setting - Lift/Tilt 4757 psi
Lift Cylinder - Bore 8.7 in
Lift Cylinder - Stroke 41.3 in
Tilt Cylinder - Bore 8.7 in
Tilt Cylinder - Stroke 27 in
Hydraulic Cycle Times
Rack Back 4.5 s
Raise 8 s
Dump 2.2 s
Lower Float Down 3.5 s
Total Hydraulic Cycle Time 18.2 s
Hydraulic System - Steering
Steering System - Circuit Pilot, load sensing
Steering System - Pump Piston, variable displacement
Maximum Flow at 1,400-1,600 rpm 71.3 gal/min
Steering Cut Off Pressure 4351 psi
Total Steering Angle 86°
Steering Cycle Times - High Idle 3.4 s
Steering Cycle Times - Low Idle 5.6 s
Air Conditioning System
Air Conditioning The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.
Front Fixed
Rear Trunnion
Oscillation Angle 13°
Brakes ISO 3450:2011
Operator's Cab
ROPS/FOPS ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards
Service Refill Capacities
Fuel Tank 147 gal (US)
Cooling System - Jacket Water 30 gal (US)
Cooling Systems - Power Train 8 gal (US)
Engine Crankcase 16 gal (US)
Diesel Exhaust Fluid Tank 8.7 gal (US)
Transmission 16 gal (US)
Differential - Final Drives - Front 49 gal (US)
Differential - Final Drives - Rear 49 gal (US)
Hydraulic System - Implement/Steering 126 gal (US)
Note All nonroad Tier 4 Final/Stage V diesel engines are required to use: – The machine has the flexibility to run on either ultra-low-sulfur diesel fuel (ULSD with 15 ppm of sulfur or less). – Cat engines are compatible with the following renewable, alternati
Sound Performance - Tier 4 Final/EU Stage V - Standard
Operator Sound Level (ISO 6396) 72 dB(A)
Machine Sound Level (ISO 6395) 109 dB(A)
Note (1) The operator sound pressure level was measured according to the test procedures and conditions specified in ISO 6396:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
Note (2) Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment.
Note (3) The machine sound power level was measured according to the test procedures and conditions specified in ISO 6395:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
Dimensions (Approximate) - Standard Lift
Ground to Top of ROPS 13.8 ft
Ground to Top of Exhaust Stacks 14.8 ft
Ground to Top of Hood 10.9 ft
Ground to Bumper Clearance 3.1 ft
Rear Axle - Centerline to Bumper 10.5 ft
Front Axle Centerline to Bucket Tip 14 ft
Wheel Base 14.9 ft
Maximum Overall Length 39.3 ft
Ground to Lower Hitch Clearance 1.9 ft
Ground to Center of Axles 3.2 ft
Clearance at Maximum Lift 11.9 ft
B-Pin Height - Maximum Lift 18 ft
Maximum Overall Height - Bucket Raised 24.5 ft
Reach - Maximum Lift 6.5 ft
Note Specs are calculated with 6.9 m3 (9.0 yd3) rock bucket and Michelin XLDD2 with 978 mm (3.2 ft) centerline of rear axle height.
Dimensions (Approximate) - High Lift
Ground to Top of ROPS 13.8 ft
Ground to Top of Exhaust Stacks 14.8 ft
Ground to Top of Hood 10.9 ft
Ground to Bumper Clearance 3.1 ft
Rear Axle - Centerline to Bumper 10.5 ft
Front Axle Centerline to Bucket Tip 15.3 ft
Wheel Base 14.9 ft
Maximum Overall Length 40.7 ft
Ground to Lower Hitch Clearance 1.9 ft
Ground to Center of Axles 3.2 ft
Clearance at Maximum Lift 13.3 ft
B-Pin Height - Maximum Lift 19.3 ft
Maximum Overall Height - Bucket Raised 25.8 ft
Reach - Maximum Lift 6.8 ft
Note Specs are calculated with 6.9 m3 (9.0 yd3) rock bucket and Michelin XLDD2 with 978 mm (3.2 ft) centerline of rear axle height.
Recyclability 96%


Proven Reliability

  • With 15+ years of electric-drive experience, the 988K XE combines the simple and robust switched reluctance technology with proven machine design.
  • More than 90 percent identical to the market leader, the 988K.
  • Fewer moving parts than traditional torque converter and mechanical transmission systems.
  • Solid-state, fully sealed, and liquid-cooled powered electronics maximize durability in extreme conditions.
  • Moves more material more efficiently with improved power and control.
  • Cat C18 engine is built and tested to meet your most demanding applications.
  • Advanced filtration system for extended performance and reliability of the hydraulic system.



  • Achieves longer engine life and improved fuel efficiency with reduced rated speed.
  • Automatic retarder controls maintain speed on grade.
  • One-piece castings provide enhanced strength in key pin areas.
  • Full box section rear frame resists torsional shock and twisting forces.
  • Durable construction withstands the toughest loading conditions and multiple life cycles.


Achieve Greater Productivity

  • Up to 10 percent increase in productivity in load and carry applications.
  • Electric-drive system eliminates shifting and simplifies operator control, accelerating the learning curve of new operators.
  • Superior acceleration, smoother directional shifts, and reduced travel times.
  • Maximum responsiveness with Steering and Integrated Control (STIC™).
  • Convenient, responsive electro-hydraulic controls increase operator productivity.
  • Superior digging, higher bucket fill factors, and reduced dig times.
  • Up to 10 percent more payload per pass, higher efficiency, and improved pass match.
  • Improved visibility over the top of the linkage.


Superior Fuel Efficiency

  • Up to 25 percent better fuel efficiency overall.
  • Up to 49 percent more fuel efficiency in truck loading applications.
  • Greenhouse gas reductions up to the equivalent of 1 year of electricity use for nearly 10 homes.
  • Continuously variable speed control up to maximum ground speed.
  • Positive Flow Control (PFC) hydraulic system increases efficiency, bucket feel, and responsiveness with consistent performance.
  • Economy mode for reduced rated engine speed and reduced fuel consumption.
  • Fully integrated electronic engine controls make your fuel go farther.
  • Engine idle shutdown for less fuel used while idling.
  • Flow sharing hydraulics for full‑flow at reduced engine rpm.
  • Increased hydraulic speed and faster cycle times for decreased idle, decreased fuel burn, and increased efficiency.


Increase Productivity and Efficiency with Integrated Technologies

  • Cat Technologies developed to monitor, manage, and enhance your jobsite operations.
  • Cat Payload provides accurate weighing* of the materials you are loading and hauling. Payload data is displayed in real-time to improve productivity and reduce overloading.
  • Cat Detect enhances awareness of the environment around working equipment and provides alerts to help keep people and assets safe on the jobsite.
  • Product Link™ wirelessly connects you to your equipment, giving you access to essential information you need to know to run your business.
  • Gain valuable insight into how your machine or fleet is performing.
  • Optional Advanced Productivity subscription provides comprehensive actionable information to help you manage and improve the productivity and profitability of your operations.
  • Up to 15% improved cycle time and 10% better bucket fill factor with optional Operator Coaching.
  • Up to 10% dig segment cycle optimization with optional New AutoDig features.

*Not legal for trade.


Safety Features

  • Hazardous voltage lamp assures electric drive system is de-energized and machine is safe to work on.
  • Achieve precise positioning for easy loading in tight areas with 43 degrees of steering articulation.
  • Precise machine control by load-sensing hydraulic steering system.
  • Reduced stairway angles and standard stairway lighting provide reduced risk of slips, trips, and falls due to better visibility of the steps and stairway.
  • Left- and right-hand stairs with 45-degree angle.
  • Computerized monitoring system with warning indicators.
  • Standard Cat Vision enhances visibility behind the machine, helping you work safely and confidently.
  • Pressurized cabin with filtered air and reduced sound levels.


Reduced Maintenance Time and Costs

  • Electric-drive system maximizes consumable life, reducing oil and filter waste. Enables two times the life for power train oil and four times the life for filters.
  • Reduce the potential for wheel slippage without reducing hydraulic efficiency with RCS (Rimpull Control System) and modulating the left pedal from 100 to 25 percent.
  • Longer life, rebuildability, and high resale value with 10 percent lower maintenance costs.
  • Grouped service points and swing-out engine compartment service doors provide easy access to critical daily service checks.
  • Ecology drains to prevent spilled contaminants.
  • Electro-hydraulic controls.
  • Reduced waste with maintenance-free batteries.
  • Vehicle Information Management System (VIMS™) notifications to resolve problems before failure.
  • Operators can now check tire pressure during operation with any change sending a fault code to VisionLink®, preventing premature tire failure.


Easy, Comfortable OperatorEnvironment

  • Best-in-class operator comfort and ergonomics.
  • Comfort Series III seats with extra thick, contoured cushions provide total comfort throughout the workday.
  • Easy-to-reach levers and seat-mounted implement pod to reduce fatigue.
  • Ergonomic switch placement and displays with large, backlit switches and LED indicators.
  • Two-position rocker switch activates the electro-hydraulic parking brake.
  • Reduced vibrations from isolated cab mounts and seat air suspension.
  • Automatic cab temperature controls.


Purpose-Built Specialty Arrangements

  • Unload a typical full-length log truck in a single pass with the larger lift and tilt cylinders and a unique tilt lever to maximize linkage force. Up to 20% more lift capacity and 26% more tilt capacity over the standard 988K.
  • Swing out fan radiator design for easier service in high-debris millyard applications reducing maintenance and service down time.Auto reversing fan system to help dislodge debris and keep air flowing across the radiator cores.
  • Additional counterweight to increase stability for improved confidence while maneuvering with full loads.
  • Purpose-built lift arm with lowered cross member to increase visibility to the tips of the forks helping to increase the speed when lining up the load and reduce operator movements to see the forks.


  • The Cat® C18 engine meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
  • The 988K XE emits up to 37% less CO2 than the previous 988K*.
  • Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels up to: 20% biodiesel FAME (fatty acid methyl ester) ** or 100% renewable diesel, HVO (hydrogenated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details.
  • The Cat® clean emissions module includes Diesel Particulate Filter (DPF), Diesel Oxidation Catalyst (DOC), and Selective Catalytic Reduction (SCR) technologies to reduce the engine’s emissions.
  • Engine Idle Shutdown Timer reduces fuel burn, greenhouse gas emissions and unnecessary idle time by shutting down the machine after a pre-set idling period.
  • Autodig helps you work more efficiently and productively and reduce fuel burn, greenhouse gas emissions, machine wear and operator fatigue.
  • Auto Set Tires reduce tire wear and lowers fuel burn and greenhouse gas emissions.
  • Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.
  • Rear Object Detection for the 988K XE helps enhance job site safety and blind spot awareness when operating in reverse.
  • Cat® Payload technology maximizes loading efficiency, helping operators of every skill level work more accurately to reduce load time, fuel costs and greenhouse gas emissions. Upgrade to Advanced Payload for expanded features and capabilities that can further increase operator efficiency and accuracy.

*All comparisons to 988K. Productivity, fuel and CO2 emissions vary by application. CO2 emissions calculations based on a reference work cycle using 2.2 U.S. gallons per hour of #2 U.S. diesel fuel based. Applies IPCC2006 methodology using U.S. EPA Emissions Hub emission factors. Includes DEF (diesel exhaust fluid) related CO2. Fuel measurements are at 15°C. Estimated average fuel consumption improvements are based on tests or Product Link® data where available. Productivity improvements are based on test data. When compared to the 988H (2010) and accounting for productivity improvements, the 988K XE emits up to 45% less CO2 per ton of material moved.
**Engines with no aftertreatment devices can use higher blends, up to 100% biodiesel.

Standard Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Electrical
    • Alarm, back-up
    • Alternator, single 150 amp
    • Batteries, dry
    • Converter, 10/15 amp, 24V to 12V
    • Lighting system (halogen, work lights, access and service platform lighting)
    • Starting and charging system, 24V
    • Starter emergency start receptacle
    • Starter lockout in bumper
    • Transmission lockout in bumper
    • Hazardous voltage lamp
  • Operator Environment
    • Graphical Information Display, displays real time operating information, performs calibrations and customizes operator settings
    • Air conditioner
    • Cat Vision, rear vision camera system
    • Cab, sound suppressed and pressurized, integrated rollover protective structure (ROPS/FOPS) radio ready for entertainment, includes antenna, speakers and converter (12‑volt 5-amp) and power port
    • Controls, lift and tilt function
    • Heater, defroster
    • Horn, electric
    • Instrumentation, gauges
      – Coolant temperature
      – Engine hour meter
      – Hydraulic oil temperature
      – Power train oil temperature
    • Light, cab, dome
    • Lunchbox, beverage holders
    • CB radio-ready
    • Mirrors, rearview (externally mounted)
    • Rimpull Control System
    • Seat, Cat Comfort Series III, heated and ventilated, air suspension, six-way adjustable
    • Seat belt minder
    • Seat belt, retractable, 76 mm (3 in) wide
    • STIC Control System
    • UV glass
    • Virtual gear indicator
    • Vital Information Management System (VIMS) with Graphical Information Display: External Data Port, Customizable Operator Profiles, Cycle Timer, Integrated Payload Control System
    • Wet-Arm wipers/washers (front and rear)
      – Intermittent front and rear wipers
    • Lights, directional
  • Power Train
    • Brakes, oil-cooled, multi-disc, service/secondary
    • Case drain screens
    • Electro hydraulic parking brake
    • Engine, C18 MEUI diesel, turbocharged/aftercooled
    • Ground level engine shutoff
    • Turbine precleaner, engine air intake
    • Radiator, Aluminum Modular Radiator (AMR)
    • Starting aid, ether, automatic
    • Throttle lock, electronic
    • Manual switch and automatic fuel priming
    • Cat Production Measurement ready
    • Cat SR Generator/Pump Drive
    • Cat SR Drive Motor
    • Cat Integrated Powered Electronics
    • Automatic retarding controls
  • Additional Equipment
    • Automatic bucket lift kickout/positioner
    • Base machine price includes a rim allowance
    • Hydraulically driven demand fan
    • Couplings, Cat O-ring face seals
    • Doors, service access (locking)
    • Ecology drains for engine, radiator, hydraulic tank
    • Fuel tank, 555 L (147 gal)
    • Hitch, drawbar with pin
    • Hoses, Cat XT
    • Hydraulic, steering and brake filtration/screening system
    • Cat Clean Emission Module
    • Oil sampling valves
    • Premixed 50 percent concentration of extended life coolant with freeze protection to –34° C (–29° F)
    • Rear access to cab and service platform
    • Steering, load sensing
    • Toe kicks
    • Vandalism protection caplocks

Optional Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Power Train
    • –50° C (–58° F) antifreeze
    • Engine oil change system, high speed, Wiggins
    • Engine block heater 120V or 240V
    • High ambient cooling – software
    • Cat Production Measurement
    • Crankcase guard
    • Engine brake, SEA
  • Other Optional Configurations
    • Aggregate Handler
    • Millyard
    • Load and Carry
  • Operator Environment
    • Cat Detect, object detection system
    • Cab precleaner
    • AM/FM/CD/MP3 radio
    • Satellite Sirius radio with Bluetooth®
    • LED warning strobe
    • Window pull down visor
    • Handrail mounted mirrors
  • Additional Equipment
    • Front and rear roading fenders
    • Fast fill fuel system (Shaw-Aero)
    • Cold Weather Starting (extra starter plus two batteries)
    • Aggregate Handler
    • Autodig feature, Tire Slip Prevention
    • Wheel Chocks
    • EZ Clean cooling system
    • Autodig features, Auto Set Tires & Lift Stall Prevention
    • Autolube with Auto shutoff
    • Tire Pressure Monitoring System
    • Load and Carry Counterweight

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