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.

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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)
Coolant (Validated by Test Cell Fill Quantities) 33gal (US)
Transmission - Validated by Test Cell Fill Quantities 29gal (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)

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)

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

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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