988K Steel Mill Arrangement


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Delivering fuel efficiency you demand through integrated machine systems.


Best built for the toughest conditions.

Power Train

Move material more efficiently with improved power and control.


Productivity enabling you to move more and make more.

Operator Station

Best-in-class operator comfort and ergonomics.

Technology Solutions

Greater productivity through Integrated Electronic Systems.


Enabling high uptime by reducing your service time.

Customer Support

Your Cat dealers know how to keep your machines productive.


Making your safety our priority.

Steel Mill Features

Keep running in the toughest environment.

Buckets and Ground Engaging Tools

Protect your investment.

Operating Costs

Save Time and Money by Working Smart.

988K Steel Mill Arrangement Standard Equipment

  • 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

  • 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

  • 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

  • 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

988K Steel Mill Arrangement Optional Equipment

  • 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)

  • Cab precleaner
  • AM/FM/CD/MP3 radio
  • Satellite Sirius radio with bluetooth
  • LED warning strobe
  • CB radio ready
  • Window pull down visor

  • Front and rear roading fenders


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.


Net Power 541.0 hp 403.0 kW Less
Engine Model Cat® C18 ACERT™ Cat® C18 ACERT™ Less
Net Power - SAE J1349 541.0 hp 403.0 kW Less
Bore 5.7 in 145.0 mm Less
Stroke 7.2 in 183.0 mm Less
Displacement 1105.0 in3 18.1 L Less
Torque Rise 58.0 % 58.0 % Less
Rated Speed 1,700 rpm 1,700 rpm Less
Emissions U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent Less
Gross (ISO 14396) 580.0 hp 432.0 kW Less
Peak Power Speed 1,500 rpm 1,500 rpm Less
Peak Power Speed @ 1,500 rpm: Gross - ISO 14396 580.0 hp 432.0 kW Less
Peak Power Speed @ 1,500 rpm: Gross - SAE J1995 588.0 hp 439.0 kW Less
Peak Power Speed @ 1,500 rpm: Net Power - SAE J1349 541.0 hp 403.0 kW Less
Peak Torque @ 1,200 rpm 2104.0 lb ft 2852.0 N·m Less

Operating Specifications

Operating Weight 112574.0 lb 51062.0 kg Less
Rated Payload 12.5 tons 11.3 tonnes Less
Rated Payload - Standard 12.5 tons 11.3 tonnes Less
Bucket Capacity Range 6.4-7.6 m3 (8.3-10 yd3) 6.4-7.6 m3 (8.3-10 yd3) Less
Cat Truck Match - Standard 770-772 770-772 Less
Cat Truck Match - High Lift 773-775 773-775 Less
Rated Payload - High Lift 12.5 tons 11.3 tonnes Less


Transmission Type Cat planetary power shift Cat planetary power shift Less
Forward 1 4.0 mph 6.5 km/h Less
Forward 2 7.2 mph 11.6 km/h Less
Forward 3 12.7 mph 20.4 km/h Less
Forward 4 21.6 mph 34.7 km/h Less
Reverse 1 4.7 mph 7.5 km/h Less
Reverse 2 8.3 mph 13.3 km/h Less
Reverse 3 14.4 mph 23.2 km/h Less
Direct Drive - Forward 1 Lock-up disabled Lock-up disabled Less
Direct Drive - Forward 2 7.8 mph 12.5 km/h Less
Direct Drive - Forward 3 13.9 mph 22.3 km/h Less
Direct Drive - Forward 4 24.4 mph 39.3 km/h Less
Direct Drive - Reverse 1 5.0 mph 8.0 km/h Less
Direct Drive - Reverse 2 8.9 mph 14.3 km/h Less
Direct Drive - Reverse 3 15.8 mph 25.5 km/h Less

Hydraulic System - Lift/Tilt

Cylinders, Double Acting: Lift, Bore and Stroke 210 mm × 1050 mm (8.3 in × 41.3 in) 210 mm × 1050 mm (8.3 in × 41.3 in) Less
Cylinders, Double Acting: Tilt, Bore and Stroke 267 mm × 685 mm (10.5 in × 27.0 in) 267 mm × 685 mm (10.5 in × 27.0 in) Less
Lift/Tilt System Variable displacement piston Variable displacement piston Less
Maximum Flow 13.7 gal/min 52.0 L/min Less
Maximum Flow at 1,400-1,860 rpm 153.0 gal/min 580.0 L/min Less
Pilot System Variable displacement piston Variable displacement piston Less
Relief Valve Setting 551.0 psi 3800.0 kPa Less
Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing EH- Positive Flow Control, Flow Sharing Less
Relief Valve Setting - Lift/Tilt 4757.0 psi 32800.0 kPa Less

Service Refill Capacities

Fuel Tank 181.0 gal 686.0 L Less
Cooling System 31.7 gal 120.0 L Less
Crankcase 15.9 gal 60.0 L Less
Transmission 31.7 gal 120.0 L Less
Differentials and Final Drives - Front 49.1 gal 186.0 L Less
Differentials and Final Drives - Rear 49.1 gal 186.0 L Less
Hydraulic System (tank only) 63.4 gal 240.0 L Less
Diesel Exhaust Fluid Tank (Tier 4) 8.7 gal 33.0 L Less
Hydraulic System Factory Fill 125.5 gal 475.0 L Less


Bucket Capacities 5.4-6.3 m3 (7.0-8.3 yd3) 5.4-6.3 m3 (7.0-8.3 yd3) Less


Front Fixed Fixed Less
Rear Trunnion Trunnion Less
Oscillation Angle ±6° ±6° Less


Brakes SAE J1473 OCT90, ISO 3450:1992 SAE J1473 OCT90, ISO 3450:1992 Less

Hydraulic System - Steering

Steering System - Circuit Pilot, load sensing Pilot, load sensing Less
Steering System - Pump Piston, variable displacement Piston, variable displacement Less
Relief Valve Setting - Steering 4351.0 psi 30000.0 kPa Less
Maximum Flow 71.3 gal/min 270.0 L/min Less
Steering Cycle Time (high idle) 3.4 Seconds 3.4 Seconds Less
Steering Cycle Time (low idle) 5.6 Seconds 5.6 Seconds Less
Total Steering Angle 80.0 Degrees 80.0 Degrees Less

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

Dump 2.2 Seconds 2.2 Seconds Less
Lower Float Down 3.5 Seconds 3.5 Seconds Less
Rackback 4.5 Seconds 4.5 Seconds Less
Raise 8.0 Seconds 8.0 Seconds Less
Total Hydraulic Cycle Time (empty bucket) 18.2 Seconds 18.2 Seconds Less

Sound Performance - Standard

Machine Sound Level (ISO 6395) 111.0 dB(A) 111.0 dB(A) Less
Operator Sound Level (ISO 6396) 71.0 dB(A) 71.0 dB(A) Less

Sound Performance - Suppression

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