988 Large Wheel Loader

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Net Power - SAE J1349541 HP (401 kW)
Engine Power - ISO 14396580 HP (432 kW)
Gross Power - SAE J1995588 HP (439 kW)
Engine ModelCat® C18 ™
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 low cost per ton. Introduced in 1963, the 988 has been an industry leader for 60 years. Focused on helping our customers succeed, we have continued to build upon each new series. The 988 continues our legacy of reliability, performance, safety, operator comfort, serviceability, and efficiency.


Net Power - SAE J1349541 HP (401 kW)
Engine Power - ISO 14396580 HP (432 kW)
Gross Power - SAE J1995588 HP (439 kW)
Engine ModelCat® C18 ™
Peak Power Speed1500/rpm
Rated Speed1700/min
EmissionsU.S. EPA Tier 4 Final, EU Stage V, and Japan 2014
Bore5.7 in (145 mm)
Stroke7.2 in (183 mm)
Displacement1105 in³ (18.1 l)
Peak Torque - 1,200 rpm2230 lb/ft (3023 N·m)
Torque Rise58 % (58 %)
Operating Weight112574 lb (51062 kg)
Rated Payload - Quarry Face12.5 t (11.3 t)
Rated Payload - Loose Material16 t (14.5 t)
Bucket Capacity Range4.7-13 m3 (6.2-17 yd3)
Cat Truck Match - Standard770~772
Cat Truck Match - High Lift773~775
Transmission TypeCat planetary powershift
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)
Lift/Tilt System - CircuitEH- Positive Flow Control, Flow Sharing
Direct Drive - Forward 424.4 mile/h (39.3 km/h)
Lift/Tilt SystemVariable displacement piston
Direct Drive - Reverse 15 mile/h (8 km/h)
Maximum Flow at 1,400-1,860 rpm153 gal/min (580 l/min)
Relief Valve Setting - Lift/Tilt4757 psi (32800 kPa)
Direct Drive - Reverse 28.9 mile/h (14.3 km/h)
Cylinders, Double Acting - Lift, Bore and Stroke210 mm × 1050 mm (8.7 in × 41.3 in)
Direct Drive - Reverse 315.8 mile/h (25.5 km/h)
Cylinders, Double Acting - Tilt, Bore and Stroke269 mm × 685 mm (8.7 in × 27 in)
Pilot SystemVariable displacement piston
Relief Valve Setting - Main551 psi (3800 kPa)
Rack Back4.5 s (4.5 s)
Raise8 s (8 s)
Dump2.2 s (2.2 s)
Lower Float Down3.5 s (3.5 s)
Total Hydraulic Cycle Time - Empty Bucket18.2 s (18.2 s)
Steering System - CircuitPilot, load sensing
Steering System - PumpPiston, variable displacement
Maximum Flow71.3 gal/min (270 l/min)
Relief Valve Setting - Steering4351 psi (30000 kPa)
Total Steering Angle86 °
Steering Cycle Times - High Idle3.4 s (3.4 s)
Steering Cycle Times - Low Idle5.6 s (5.6 s)
Air ConditioningThe 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.
Oscillation Angle13 °
BrakesISO 3450:2011
ROPS/FOPSROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards
Fuel Tank188 gal (US) (712 l)
Cooling System31.7 gal (US) (120 l)
Coolant (Validated by Test Cell Fill Quantities)33 gal (US) (125 l)
Crankcase15.9 gal (US) (60 l)
Diesel Exhaust Fluid Tank8.7 gal (US) (33 l)
Transmission31.7 gal (US) (120 l)
Transmission - Validated by Test Cell Fill Quantities29 gal (US) (110 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)
Hydraulic System - Tank Only63.4 gal (US) (240 l)
Operator Sound Level (ISO 6396)72 dB(A) (72 dB(A))
Machine Sound Level (ISO 6395)111 dB(A) (111 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.
Ground to Top of ROPS13.8 ft (4202 mm)
Ground to Top of Exhaust Stacks14.8 ft (4521 mm)
Ground to Top of Hood10.9 ft (3334 mm)
Rear Axle - Centerline to Bumper10.5 ft (3187 mm)
Front Axle Centerline to Bucket Tip14 ft (4254 mm)
Wheel Base14.9 ft (4550 mm)
Maximum Overall Length39.3 ft (11991 mm)
Ground to Lower Hitch Clearance1.9 ft (568 mm)
Ground to Top of ROPS13.8 ft (4202 mm)
Clearance at Maximum Lift11.9 ft (3641 mm)
Ground to Top of Exhaust Stacks14.8 ft (4521 mm)
B-Pin Height - Maximum Lift18 ft (5491 mm)
Maximum Overall Height - Bucket Raised24.5 ft (7455 mm)
Ground to Top of Hood10.9 ft (3334 mm)
Reach - Maximum Lift6.5 ft (1981 mm)
Rear Axle - Centerline to Bumper10.5 ft (3187 mm)
Front Axle Centerline to Bucket Tip15.3 ft (4661 mm)
Wheel Base14.9 ft (4550 mm)
Maximum Overall Length40.7 ft (12398 mm)
Ground to Lower Hitch Clearance1.9 ft (568 mm)
Clearance at Maximum Lift13.3 ft (4043 mm)
B-Pin Height - Maximum Lift19.3 ft (5887 mm)
Maximum Overall Height - Bucket Raised25.8 ft (7849 mm)
Reach - Maximum Lift6.8 ft (2062 mm)
Bucket Capacities4.7-13 m3 (6.2-17 yd3)

Benefits and Features

  • Cat C18 engine is built and tested to meet your most demanding applications.
  • Cat torque converter with lock-up clutch eliminates torque converter losses and lowers system heat.
  • Maximum responsiveness with Steering and Transmission Integrated Control (STIC™).
  • Moves more material more efficiently with improved power and control.
  • Durable construction withstands the toughest loading conditions and multiple lifecycles.

  • Best-in-class transmission for long life and consistent, smooth shifting; specifically designed for mining applications.
  • Advanced productivity electronic control strategy (APECS) transmission controls for greater momentum on grades.
  • Positive flow control (PFC) hydraulic system increases efficiency, bucket feel, and responsiveness with consistent performance.
  • Advanced filtration system for extended performance and reliability of the hydraulic system.
  • Impeller clutch torque converter (ICTC) minimizes tire spin by allowing torque to adjust to underfoot conditions.

  • Improved cycle times and bucket fill factors with optional operator coaching.
  • Optimized dig segment cycle with optional operator assist – tire slip prevention, auto set tires, and lift stall prevention.
  • Superior digging, higher bucket fill factors, reduced dig times.
  • Improved visibility over the top of the linkage.
  • Up to 10% more payload per pass, higher efficiency, and improved pass match.
  • Operators can now check tire pressure during operation with any change sending a fault code to VisionLink®, preventing premature tire failure.
  • In-truck loading applications.
  • Convenient, responsive, electro-hydraulic controls increase operator productivity.
  • Integrated steering and transmission controls.

  • Economy mode optimizes engine speed control for reduced fuel consumption no matter if operating in manual throttle or throttle lock.
  • Flow sharing hydraulics for full flow at reduced engine rpm.
  • Fully integrated electronic engine controls make your fuel go farther.
  • Engine idle shutdown for less fuel used while idling.
  • Increased hydraulic speed and faster cycle times for decreased idle, decreased fuel burn, and increased efficiency.

  • 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.
*Not legal for trade.

  • 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 visbility 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.

  • 10% lower maintenance costs.
  • Grouped service points provide easy access to critical daily service checks.
  • Electro-hydraulic controls.
  • Swing-out engine compartment service doors.
  • Reduced waste with maintenance-free batteries.
  • Ecology drains to prevent spilled contaminants and allow for easier service.
  • Vehicle Information Management System (VIMS™) notifications to resolve problems before failure.
  • Ground level access to transmission control valves.
  • Longer life, rebuildability, and high resale value.

  • Best-in-class operator comfort and ergonomics.
  • Cat Premium Plus seat with standard features including leather finish, forced air heating and cooling, two-way thigh adjustment, power lumbar and back bolster adjustment, and dynamic end dampening to 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.

  • Delivers stability and durability with an optimized counterweight for block handling applications.
  • A high rimpull powertrain features a torque converter and transmission specially designed for this application to maximize rimpull.
  • An additional hydraulic valve with the quick coupler allows the operator to switch work tools and immediately lock the work tool during load and carry applications.
  • Larger tilt and lift cylinders on the linkage help improve load control and ensure safe and long lasting operation.
  • Ride control acts as a shock absorber, providing the operator with a smoother ride over rough terrain.

  • Swing-out fan radiator design for easier service in high-debris millyard applications, reducing maintenance and service downtime.
  • Auto reversing fan system to help dislodge debris and keep air flowing across the radiator cores.
  • Ecology drains for ease of service and prevention of spilling potential environmental contaminants.
  • Achieve precise positioning for easy loading in tight areas with 37 degrees of steering articulation.
  • Millyard and logging forks are designed to move wood in the millyard.
  • Woodchip buckets are designed with performance characteristics to bring productivity and fuel efficiency to load-and-carry work in the yard.
  • Stress relieved lift arms increase durability and lengthen time to repair.

  • Durable and reinforced attachments for operator comfort, safety, and easy machine access.
  • Radiator is designed for easy cleaning and to keep material from building up.
  • Auto reversing fan and easy access to cooling cores keeps cab at comfortable temperature.
  • Equipped with extra guarding and heat protection for critical machine functions.
  • Flame resistant ecosafe hydraulic fluid available as an option.
  • Performance series, serrated edge slag, straight edge slag, and slag buckets maximize material retention and minimize dig time.

Standard Equipment

  • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • 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
  • 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
  • Mirrors, rearview (externally mounted)
  • Rimpull Control System
  • Seat, deluxe
  • Seat belt minder
  • Seat belt, retractable, 76 mm (3 in) wide
  • STIC Control System
  • UV glass
  • Transmission 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
  • Brakes, oil-cooled, multi-disc, service/secondary
  • Case drain screens
  • Crankcase guard
  • 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
  • Torque converter, Impeller Clutch (ICTC) with Lock up clutch (LUC), Rimpull Control System
  • Transmission, planetary powershift, 4F/3R electronic control
  • Manual switch and automatic fuel priming
  • Cat Production Measurement ready
  • 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, 712 L (188 gal)
  • Hitch, drawbar with pin
  • Hoses, Cat XT™
  • Hydraulic, steering and brake filtration/screening system
  • Cat Clean Emission Module
  • Oil sampling valves
  • Premixed 50% 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

  • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • –50° C (–58° F) antifreeze
  • Engine oil change system, high speed, Wiggins
  • High ambient cooling – software
  • Cat Production Measurement
  • Cab precleaner
  • AM/FM/CD/MP3 radio
  • Satellite Sirius radio with bluetooth
  • LED warning strobe
  • CB radio ready
  • Window pull down visor
  • Handrail mounted mirrors
  • Load and carry counterweight
  • Front and rear roading fenders
  • Fast fill fuel system (Shaw-Aero)
  • Cold Weather Starting (extra starter plus two batteries), engine block heater 120V or 240V, heated fuel lines
  • Aggregate Handler