Cat Wheel Loaders:

988K Wheel Loader Steel Mill Arrangement

Net Power
541.0 hp
Operating Weight
112574.0 lb
Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)
Engine Model
Cat® C18 ACERT™

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.



Benefits & Features

Product Specs

  • Engine

  • Net Power
    541.0hp
    Engine Model
    Cat® C18 ACERT™
    Net Power - SAE J1349
    541.0hp
    Bore
    5.7in
    Stroke
    7.2in
    Displacement
    1105.0in3
    Torque Rise
    58.0%
    Rated Speed
    1,700 rpm
    Emissions
    U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent
    Gross (ISO 14396)
    580.0hp
    Peak Power Speed
    1,500 rpm
    Peak Power Speed @ 1,500 rpm: Gross - ISO 14396
    580.0hp
    Peak Power Speed @ 1,500 rpm: Gross - SAE J1995
    588.0hp
    Peak Power Speed @ 1,500 rpm: Net Power - SAE J1349
    541.0hp
    Peak Torque @ 1,200 rpm
    2104.0lb ft
  • Operating Specifications

  • Operating Weight
    112574.0lb
    Rated Payload
    12.5tons
    Rated Payload - Standard
    12.5tons
    Bucket Capacity Range
    6.4-7.6 m3 (8.3-10 yd3)
    Cat Truck Match - Standard
    770-772
    Cat Truck Match - High Lift
    773-775
    Rated Payload - High Lift
    12.5tons
  • Buckets

  • Bucket Capacities
    5.4-6.3 m3 (7.0-8.3 yd3)
  • Transmission

  • Transmission Type
    Cat planetary power shift
    Forward 1
    4.0mph
    Forward 2
    7.2mph
    Forward 3
    12.7mph
    Forward 4
    21.6mph
    Reverse 1
    4.7mph
    Reverse 2
    8.3mph
    Reverse 3
    14.4mph
    Direct Drive - Forward 1
    Lock-up disabled
    Direct Drive - Forward 2
    7.8mph
    Direct Drive - Forward 3
    13.9mph
    Direct Drive - Forward 4
    24.4mph
    Direct Drive - Reverse 1
    5.0mph
    Direct Drive - Reverse 2
    8.9mph
    Direct Drive - Reverse 3
    15.8mph
  • Axles

  • Front
    Fixed
    Rear
    Trunnion
    Oscillation Angle
    ±6°
  • Hydraulic System - Steering

  • Steering System - Circuit
    Pilot, load sensing
    Steering System - Pump
    Piston, variable displacement
    Relief Valve Setting - Steering
    4351.0psi
    Maximum Flow
    71.3gal/min
    Steering Cycle Time (high idle)
    3.4Seconds
    Steering Cycle Time (low idle)
    5.6Seconds
    Total Steering Angle
    80.0Degrees
  • Service Refill Capacities

  • Fuel Tank
    181.0gal
    Cooling System
    31.7gal
    Crankcase
    15.9gal
    Transmission
    31.7gal
    Differentials and Final Drives - Front
    49.1gal
    Differentials and Final Drives - Rear
    49.1gal
    Hydraulic System (tank only)
    63.4gal
    Diesel Exhaust Fluid Tank (Tier 4)
    8.7gal
    Hydraulic System Factory Fill
    125.5gal
  • Sound Performance - Standard

  • Machine Sound Level (ISO 6395)
    111.0dB(A)
    Operator Sound Level (ISO 6396)
    71.0dB(A)
  • Hydraulic System - Lift/Tilt

  • Cylinders, Double Acting: Lift, Bore and Stroke
    210 mm × 1050 mm (8.3 in × 41.3 in)
    Cylinders, Double Acting: Tilt, Bore and Stroke
    267 mm × 685 mm (10.5 in × 27.0 in)
    Lift/Tilt System
    Variable displacement piston
    Maximum Flow
    13.7gal/min
    Maximum Flow at 1,400-1,860 rpm
    153.0gal/min
    Pilot System
    Variable displacement piston
    Relief Valve Setting
    551.0psi
    Lift/Tilt System - Circuit
    EH- Positive Flow Control, Flow Sharing
    Relief Valve Setting - Lift/Tilt
    4757.0psi
  • Hydraulic Cycle Time (1,400-1,860 rpm)

  • Dump
    2.2Seconds
    Lower Float Down
    3.5Seconds
    Rackback
    4.5Seconds
    Raise
    8.0Seconds
    Total Hydraulic Cycle Time (empty bucket)
    18.2Seconds
  • Sound Performance - Suppression

  • Machine Sound Level (ISO 6395)
    109.0dB(A)
    Operator Sound Level (ISO 6396)
    70.0dB(A)
  • Brakes

  • Brakes
    SAE J1473 OCT90, ISO 3450:1992

Equipment

  • 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
    • Transmission lockout
  • Operator Environment
    • Graphical Information Display, displays real time operating information, performs calibrations and customizes operator settings
    • Air conditioner
    • Cat Detect 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, Cat Comfort (cloth), air suspension, six-way adjustable
    • 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
    • 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, Next Generation Modular (NGMR)
    • 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
  • Other
    • 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, 731 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
  • Power Train
    • 50° C (-58° F) antifreeze
    • Engine oil change system, high speed, Wiggins
    • Engine block heater 120V or 240V
    • High ambient cooling - software
    • Payload Control System (PCS)
  • Operator Environment
    • Cab precleaner
    • AM/FM/CD/MP3 radio
    • Satellite Sirius radio with bluetooth
    • LED warning strobe
    • CB radio ready
    • Window pull down visor
  • Miscellaneous Attachments
    • Front and rear roading fenders

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