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988K 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 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.

Engine

Net Power

541HP

Engine Model

Cat® C18 ™

Bore

5.7in

Stroke

7.2in

Displacement

1105in³

Torque Rise

58%

Rated Speed

1700/min

Peak Torque - 1,200 rpm

2104lb/ft

Net Power - SAE J1349

541HP

Peak Power Speed

1500/min

Peak Power Speed - 1,500 rpm - Gross - ISO 14396

580HP

Gross - ISO 14396

580HP

Peak Power Speed - 1,500 rpm - Gross - SAE J1995

588HP

Emissions

U.S. EPA Tier 4 Final/EU Stage V OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent

Peak Power Speed - 1,500 rpm - Net Power - SAE J1349

541HP

Operating Specifications

Operating Weight

112574lb

Bucket Capacity Range

4.7-13 m3 (6.2-17 yd3)

Rated Payload - Quarry Face

12.5t

Cat Truck Match - High Lift

773~775

Rated Payload - Loose Material

16t

Cat Truck Match - Standard

770~772

Buckets

Bucket Capacities

4.7-13 m3 (6.2-17 yd3)

Transmission

Transmission Type

Cat-Planetenlastschaltgetriebe

Forward - 1

4mile/h

Forward - 2

7.2mile/h

Forward - 3

12.7mile/h

Forward - 4

21.6mile/h

Reverse - 1

4.7mile/h

Reverse - 2

8.3mile/h

Reverse - 3

14.4mile/h

Direct Drive - Reverse 2

8.9mile/h

Direct Drive - Reverse 3

15.8mile/h

Direct Drive - Forward 2

7.8mile/h

Direct Drive - Reverse 1

5mile/h

Direct Drive - Forward 1

Lock-up disabled

Direct Drive - Forward 3

13.9mile/h

Direct Drive - Forward 4

24.4mile/h

Axles

Front

Fixed

Rear

Trunnion

Oscillation Angle

13 °

Service Refill Capacities

Fuel Tank

188gal (US)

Cooling System

31.7gal (US)

Crankcase

15.9gal (US)

Transmission

31.7gal (US)

Hydraulic System - Tank Only

63.4gal (US)

Differential - Final Drives - Rear

49.1gal (US)

Hydraulic System Factory Fill

125.5gal (US)

Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only)

8.7gal (US)

Differential - Final Drives - Front

49.1gal (US)

Coolant (Validated by Test Cell Fill Quantities)

33gal (US)

Transmission - Validated by Test Cell Fill Quantities

29gal (US)

Hydraulic System - Lift/Tilt

Maximum Flow

13.7gal/min

Maximum Flow at 1,400-1,860 rpm

153gal/min

Lift/Tilt System

Variable displacement piston

Cylinders, Double Acting - Tilt, Bore and Stroke

269 mm × 685 mm (8.7 in × 27 in)

Relief Valve Setting - Main

551psi

Relief Valve Setting - Lift/Tilt

4757psi

Pilot System

Variable displacement piston

Cylinders, Double Acting - Lift, Bore and Stroke

210 mm × 1050 mm (8.7 in × 41.3 in)

Lift/Tilt System - Circuit

EH- Positive Flow Control, Flow Sharing

Hydraulic System - Steering

Steering System - Pump

Piston, variable displacement

Total Steering Angle

86 °

Maximum Flow

71.3gal/min

Relief Valve Setting - Steering

4351psi

Steering Cycle Times - High Idle

3.4s

Steering System - Circuit

Pilot, load sensing

Steering Cycle Times - Low Idle

5.6s

Hydraulic Cycle Time (1,400-1,860 rpm)

Total Hydraulic Cycle Time - Empty Bucket

18.2s

Lower Float Down

3.5s

Rack Back

4.5s

Raise

8s

Dump

2.2s

Sound Performance - Tier 4 Final/Stage IV - Standard

Operator Sound Level (ISO 6396)

72dB(A)

Machine Sound Level (ISO 6395)

111dB(A)

Sound Performance - Tier 4 Final/Stage IV: Suppression

Machine Sound Level (ISO 6395)

109dB(A)

Operator Sound Level (ISO 6396)

72dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Suppression

Operator Sound Level (ISO 6396)

72dB(A)

Machine Sound Level (ISO 6395)

110dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Standard

Machine Sound Level (ISO 6395)

112dB(A)

Operator Sound Level ( ISO 6396)

73dB(A)

Brakes

Brakes

SAE J1473 OKT90, ISO 3450:1992

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
  • 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 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
    • 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
    • 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

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
  • Operator Environment
    • 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
    • Front and rear roading fenders
    • Fast fill fuel system (Shaw-Aero)
    • Cold Weather Starting (extra starter plus two batteries)
    • Aggregate Handler

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