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 J1349
401 kW
Engine Power – ISO 14396
432 kW
Gross Power – SAE J1995
439 kW
Product specifications for 988 Large Wheel Loaders
Engine
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Net Power – SAE J1349
401 kW
Engine Power – ISO 14396
432 kW
Gross Power – SAE J1995
439 kW
Engine Model
Cat® C18 ™
Peak Power Speed
1500/rpm
Rated Speed
1700/min
Emissions
U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014
Bore
145 mm
Stroke
183 mm
Displacement
18.1 l
Peak Torque – 1,200 rpm
3023 N·m
Torque Rise
58 %
Operating Specifications
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Operating Weight
51062 kg
Rated Payload – Quarry Face
11.3 t
Rated Payload – Loose Material
14.5 t
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Cat Truck Match – Standard
770～772
Cat Truck Match – High Lift
773～775
Transmission
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Transmission Type
Cat planetary powershift
Forward – 1
6.5 km/h
Forward – 2
11.6 km/h
Forward – 3
20.4 km/h
Forward – 4
34.7 km/h
Reverse – 1
7.5 km/h
Reverse – 2
13.3 km/h
Reverse – 3
23.2 km/h
Direct Drive – Forward 1
Lock-up disabled
Direct Drive – Forward 2
12.5 km/h
Direct Drive – Forward 3
22.3 km/h
Direct Drive – Forward 4
39.3 km/h
Direct Drive – Reverse 1
8 km/h
Direct Drive – Reverse 2
14.3 km/h
Direct Drive – Reverse 3
25.5 km/h
Hydraulic System – Lift/Tilt
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Lift/Tilt System – Circuit
EH- Positive Flow Control, Flow Sharing
Lift/Tilt System
Variable displacement piston
Maximum Flow at 1,400-1,860 rpm
580 l/min
Relief Valve Setting – Lift/Tilt
32800 kPa
Cylinders, Double Acting – Lift, Bore and Stroke
210 mm × 1050 mm (8.7 in × 41.3 in)
Cylinders, Double Acting – Tilt, Bore and Stroke
269 mm × 685 mm (8.7 in × 27 in)
Pilot System
Variable displacement piston
Relief Valve Setting – Main
3800 kPa
Hydraulic Cycle Time (1,400-1,860 rpm)
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Rack Back
4.5 s
Raise
8 s
Dump
2.2 s
Lower Float Down
3.5 s
Total Hydraulic Cycle Time – Empty Bucket
18.2 s
Hydraulic System – Steering
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Steering System – Circuit
Pilot, load sensing
Steering System – Pump
Piston, variable displacement
Maximum Flow
270 l/min
Relief Valve Setting – Steering
30000 kPa
Total Steering Angle
86 °
Steering Cycle Times – High Idle
3.4 s
Steering Cycle Times – Low Idle
5.6 s
Air Conditioning System
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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
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Front
Fixed
Rear
Trunnion
Oscillation Angle
13 °
Brakes
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Brakes
ISO 3450:2011
Operator’s Cab
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ROPS/FOPS
ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards
Service Refill Capacities
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Fuel Tank
712 l
Cooling System
120 l
Coolant (Validated by Test Cell Fill Quantities)
125 l
Crankcase
60 l
Diesel Exhaust Fluid Tank
33 l
Transmission
120 l
Transmission – Validated by Test Cell Fill Quantities
110 l
Differential – Final Drives – Front
186 l
Differential – Final Drives – Rear
186 l
Hydraulic System Factory Fill
475 l
Hydraulic System – Tank Only
240 l
Sound Performance – Tier 4 Final/EU Stage V – Standard
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Operator Sound Level (ISO 6396)
72 dB(A)
Machine Sound Level (ISO 6395)
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.
Dimensions (Approximate) – Standard Lift Linkage
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Ground to Top of ROPS
4202 mm
Ground to Top of Exhaust Stacks
4521 mm
Ground to Top of Hood
3334 mm
Rear Axle – Centerline to Bumper
3187 mm
Front Axle Centerline to Bucket Tip
4254 mm
Wheel Base
4550 mm
Maximum Overall Length
11991 mm
Ground to Lower Hitch Clearance
568 mm
Clearance at Maximum Lift
3641 mm
B-Pin Height – Maximum Lift
5491 mm
Maximum Overall Height – Bucket Raised
7455 mm
Reach – Maximum Lift
1981 mm
Dimensions (Approximate) – High Lift Linkage
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Ground to Top of ROPS
4202 mm
Ground to Top of Exhaust Stacks
4521 mm
Ground to Top of Hood
3334 mm
Rear Axle – Centerline to Bumper
3187 mm
Front Axle Centerline to Bucket Tip
4661 mm
Wheel Base
4550 mm
Maximum Overall Length
12398 mm
Ground to Lower Hitch Clearance
568 mm
Clearance at Maximum Lift
4043 mm
B-Pin Height – Maximum Lift
5887 mm
Maximum Overall Height – Bucket Raised
7849 mm
Reach – Maximum Lift
2062 mm
Buckets
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Bucket Capacities
4.7-13 m3 (6.2-17 yd3)
PROVEN RELIABILITY
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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 (STICâ„¢).
Moves more material more efficiently with improved power and control.
Durable construction withstands the toughest loading conditions and multiple lifecycles.
LONG TERM VALUE AND DURABILITY
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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.
PERFORMANCE AND PRODUCTIVITY
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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.
PERFORMANCE WITH LESS FUEL
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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.
PRODUCTIVITY WITH TECHNOLOGY
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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 Linkâ„¢ 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.
SAFETY FIRST
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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.
SAVE ON SERVICE AND MAINTENANCE
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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 (VIMSâ„¢) notifications to resolve problems before failure.
Ground level access to transmission control valves.
Longer life, rebuildability, and high resale value.
OPERATOR COMFORT AND CONTROL
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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.
PURPOSE-BUILT SPECIALTY MODELS – BLOCK HANDLER
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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.
PURPOSE-BUILT SPECIALTY MODELS – MILLYARD
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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.
PURPOSE-BUILT SPECIALTY MODELS – STEEL MILL
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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.
988 Standard Equipment
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NOTE
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Standard and optional equipment may vary. Consult your Cat dealer for details.
ELECTRICAL
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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
OPERATOR ENVIRONMENT
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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
POWER TRAIN
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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
OTHER
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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 XTâ„¢
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
988 Optional Equipment
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NOTE
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Standard and optional equipment may vary. Consult your Cat dealer for details.
POWER TRAIN
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–50° C (–58° F) antifreeze
Engine oil change system, high speed, Wiggins
High ambient cooling – software
Cat Production Measurement
OPERATOR ENVIRONMENT
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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
MISCELLANEOUS ATTACHMENTS
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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
