988K Millyard Arrangement


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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. The 988K Millyard Arrangement is designed to meet the demands of millyard applications. The features of the 988K Millyard work together to provide a durable and reliable machine to meet the needs of the modern millyard.


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 Technology or Tier 2 Equivalent U.S. EPA Tier 4 Final/EU Stage IV Technology or 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


Fork End Area 69.0 ft2 6.4 m2 Less

Operating Specifications

Operating Weight 139920.0 lb 63600.0 kg Less
Tipping Load - Articulated 37° 68005.0 lb 30910.0 kg Less
Tipping Load - Straight 78115.0 lb 35500.0 kg 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 235 mm × 976 mm (9.25 in × 38.4 in) 235 mm × 976 mm (9.25 in × 38.4 in) Less
Cylinders, Double Acting: Tilt, Bore and Stroke 292 mm × 671 mm (11.5 in × 26.4 in) 292 mm × 671 mm (11.5 in × 26.4 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 580.0 psi 4000.0 kPa Less
Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing EH- Positive Flow Control, Flow Sharing Less
Relief Valve Setting - Lift/Tilt 4641.0 psi 32000.0 kPa Less

Service Refill Capacities

Fuel Tank 188.0 gal 712.0 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 8.7 gal 33.0 L Less
Hydraulic System Factory Fill 125.5 gal 475.0 L Less

Dimensions - Millyard Linkage

Dump Angle at Maximum Lift 39.4 Degrees 39.4 Degrees Less
Fork Height at Maximum Lift 15.3 ft 4660.0 mm Less
Fork Height with Level Arms 8.1 ft 2468.0 mm Less
Fork Top Clamp Opening 12.3 ft 3741.0 mm Less
Front Axle Center Line to Fork Tip 15.6 ft 4765.0 mm Less
Ground to Bumper Clearance 3.1 ft 933.0 mm Less
Ground to Center of Front Axle 3.2 ft 978.0 mm Less
Ground to Lower Hitch Clearance 1.9 ft 568.0 mm Less
Ground to Top of Exhaust Stack 13.8 ft 4214.0 mm Less
Ground to Top of Hood 10.9 ft 3334.0 mm Less
Ground to Top of ROPS 13.8 ft 4221.0 mm Less
Hinge Pin Height at Maximum Lift 16.1 ft 4918.0 mm Less
Maximum Overall Length 41.0 ft 12502.0 mm Less
Rear Axle Center Line to Bumper 10.5 ft 3187.0 mm Less
Wheelbase 14.9 ft 4550.0 mm Less


Front Fixed Fixed Less
Rear Trunnion Trunnion Less
Oscillation Angle 13° 13° 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 74.0 Degrees 74.0 Degrees 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


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.


Making sustainable progress possible.


Work Tool options to meet your needs.

988K Millyard 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 in bumper
  • Transmission lockout in bumper

  • 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

  • Swing out radiator system with 6 fpi radiator cores
  • Auto-reversing fan with adjustable controls and manual cycle
  • Hinged, perforated side doors
  • 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 Millyard 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

  • 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
  • Fast fill fuel system (Shaw-Aero)

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