988K XE Wheel Loader
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.
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PROVEN RELIABILITYTest
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.
LONG TERM VALUE AND DURABILITYTest
Durability
- 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 PRODUCTIVITYTest
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.
POWERFUL EFFICIENCYTest
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.
PRODUCTIVITY WITH TECHNOLOGYTest
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.
SAFETY FIRSTTest
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.
SAVE ON SERVICE AND MAINTENANCETest
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.
OPERATOR COMFORT AND CONTROLTest
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 MODELSTest
Purpose-Built Specialty Arrangements
Millyard
Millyard
- 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.
Engine
| Net Power - SAE J1349 | 401kW538HP |
|---|---|
| Engine Model | Cat® C18 ™ |
| Engine Power - ISO 14396 | 432kW580HP |
| Gross Power - SAE J1995 | 439kW588HP |
| Rated Speed | 1,700 rpm |
| Emissions | U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 |
| Peak Power Speed | 1,500 rpm |
| Bore | 145mm5.7in |
| Stroke | 183mm7.2in |
| Displacement | 18.1l1105in³ |
| Peak Torque - 1,200 rpm - SAE J1995 | 3023N·m2230ft·lbf |
| Torque Rise | 58% |
Operating Specifications
| Operating Weight | 52781kg116362lb |
|---|---|
| Operating Weight - Standard | 52781kg116362lb |
| Operating Weight - High Lift | 54258kg119618lb |
| Rated Payload - Standard (Quarry Face) | 11.3t12.5ton (US) |
| Rated Payload - Loose Material (Standard) | 14.5t16ton (US) |
| Bucket Capacity Range | 4.7-13 m3 (6.2-17 yd3) |
Buckets
| Bucket Capacities | 4.7-13 m3 (6.2-17 yd3) |
|---|
Transmission
| Transmission Type | Cat switched reluctance electric drive |
|---|---|
| Forward 1 (virtual) | 7km/h4.3mile/h |
| Forward 2 (virtual) | 11.3km/h7mile/h |
| Forward 3 (virtual) | 22.2km/h13.8mile/h |
| Forward 4 (virtual) | 32.1km/h20mile/h |
| Reverse 1 (virtual) | 7km/h4.3mile/h |
| Reverse 2 (virtual) | 11.3km/h7mile/h |
| Reverse 3 (virtual) | 28.2km/h17.5mile/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 | 580l/min153gal/min |
| Relief Valve Setting - Lift/Tilt | 32800kPa4757psi |
| Lift Cylinder - Bore | 210mm8.7in |
| Lift Cylinder - Stroke | 1050mm41.3in |
| Tilt Cylinder - Bore | 269mm8.7in |
| Tilt Cylinder - Stroke | 685mm27in |
Hydraulic Cycle Times
| Rack Back | 4.5s4.5s |
|---|---|
| Raise | 8s8s |
| Dump | 2.2s2.2s |
| Lower Float Down | 3.5s3.5s |
| Total Hydraulic Cycle Time | 18.2s18.2s |
Hydraulic System - Steering
| Steering System - Circuit | Pilot, load sensing |
|---|---|
| Steering System - Pump | Piston, variable displacement |
| Maximum Flow at 1,400-1,600 rpm | 270l/min71.3gal/min |
| Steering Cut Off Pressure | 30000kPa4351psi |
| Total Steering Angle | 86° |
| Steering Cycle Times - High Idle | 3.4s3.4s |
| Steering Cycle Times - Low Idle | 5.6s5.6s |
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. |
|---|
Axles
| Front | Fixed |
|---|---|
| Rear | Trunnion |
| Oscillation Angle | 13° |
Brakes
| Brakes | ISO 3450:2011 |
|---|
Operator's Cab
| ROPS/FOPS | ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards |
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Service Refill Capacities
| Fuel Tank | 555l147gal (US) |
|---|---|
| Cooling System - Jacket Water | 112l30gal (US) |
| Cooling Systems - Power Train | 30l8gal (US) |
| Engine Crankcase | 60l16gal (US) |
| Diesel Exhaust Fluid Tank | 33l8.7gal (US) |
| Transmission | 60l16gal (US) |
| Differential - Final Drives - Front | 186l49gal (US) |
| Differential - Final Drives - Rear | 186l49gal (US) |
| Hydraulic System - Implement/Steering | 475l126gal (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, alternative, and biodiesel* fuels that reduce greenhouse gases: Up to B20 biodiesel (FAME) ** Up to 100% HVO and GTL renewable fuels * Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details. – Cat DEO-ULS™ or oils that meet the Cat ECF-3, API CJ-4, and ACEA E9 specifications are required. – Only use DEF that meets ISO 22241-1 standards. |
Sound Performance - Tier 4 Final/EU Stage V - Standard
| Operator Sound Level (ISO 6396) | 72dB(A)72dB(A) |
|---|---|
| Machine Sound Level (ISO 6395) | 109dB(A)109dB(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 | 4202mm13.8ft |
|---|---|
| Ground to Top of Exhaust Stacks | 4498mm14.8ft |
| Ground to Top of Hood | 3334mm10.9ft |
| Ground to Bumper Clearance | 933mm3.1ft |
| Rear Axle - Centerline to Bumper | 3187mm10.5ft |
| Front Axle Centerline to Bucket Tip | 14mm14ft |
| Wheel Base | 4550mm14.9ft |
| Maximum Overall Length | 11991mm39.3ft |
| Ground to Lower Hitch Clearance | 568mm1.9ft |
| Ground to Center of Axles | 978mm3.2ft |
| Clearance at Maximum Lift | 3641mm11.9ft |
| B-Pin Height - Maximum Lift | 5479mm18ft |
| Maximum Overall Height - Bucket Raised | 7455mm24.5ft |
| Reach - Maximum Lift | 1981mm6.5ft |
| 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 | 4202mm13.8ft |
|---|---|
| Ground to Top of Exhaust Stacks | 4498mm14.8ft |
| Ground to Top of Hood | 3334mm10.9ft |
| Ground to Bumper Clearance | 933mm3.1ft |
| Rear Axle - Centerline to Bumper | 3187mm10.5ft |
| Front Axle Centerline to Bucket Tip | 4661mm15.3ft |
| Wheel Base | 4550mm14.9ft |
| Maximum Overall Length | 12398mm40.7ft |
| Ground to Lower Hitch Clearance | 568mm1.9ft |
| Ground to Center of Axles | 978mm3.2ft |
| Clearance at Maximum Lift | 4043mm13.3ft |
| B-Pin Height - Maximum Lift | 5881mm19.3ft |
| Maximum Overall Height - Bucket Raised | 7849mm25.8ft |
| Reach - Maximum Lift | 2062mm6.8ft |
| 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. |
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