988K Wheel Loader

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.

Net Power
541.0 hp
Operating Weight
112574.0 lb
Bucket Capacities
4.7-13 m3 (6.2-17 yd3)
Engine Model
Cat® C18 ACERT™

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 OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Gross - ISO 14396
580HP
Peak Power Speed
1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
580HP
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
588HP
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
541HP
Peak Torque - 1,200 rpm
2104lb/ft
Net Power
541HP
Engine Model
Cat® C18 ACERT™
Bore
5.7in
Stroke
7.2in
Displacement
1105in³
Torque Rise
58%
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Net Power - SAE J1349
541HP

Operating Specifications

Operating Weight
112574.0lb
Rated Payload – Quarry Face
12.5tons
Rated Payload – Loose Material
16tons
Rated Payload - High Lift
12.5tons
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Cat Truck Match - Standard
770-772
Cat Truck Match - High Lift
773-775
Operating Weight
112574lb
Rated Payload - Loose Material
16t
Rated Payload - Quarry Face
12.5t

Buckets

Bucket Capacities
4.7-13 m3 (6.2-17 yd3)
Bucket Capacities
4.7-13 m3 (6.2-17 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 2
7.8mph
Direct Drive Reverse 1
5.0mph
Direct Drive Reverse 2
8.9mph
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 3
13.9mile/h
Direct Drive - Forward 4
24.4mile/h
Direct Drive - Reverse 3
15.8mile/h
Transmission Type
Cat planetary power shift
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 - Forward 2
7.8mile/h
Direct Drive - Reverse 1
5mile/h
Direct Drive - Reverse 2
8.9mile/h

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
13°
Front
Fixed
Rear
Trunnion
Oscillation Angle
13°

Hydraulic System – Steering

Steering System – Circuit
Pilot, load sensing
Steering System – Pump
Piston, variable displacement
Maximum Flow
71.3gal/min
Steering Cycle Time (high idle)
3.4sec
Steering Cycle Time (low idle)
5.6sec
Total Steering Angle
86°

Service Refill Capacities

Fuel Tank
188.0gal
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 (for Tier 4 Final/Stage IV only)
8.7gal
Fuel Tank
188gal (US)
Cooling System
31.7gal (US)
Crankcase
15.9gal (US)
Transmission
31.7gal (US)
Hydraulic System - Tank Only
63.4gal (US)
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only)
8.7gal (US)
Differential - Final Drives - Front
49.1gal (US)
Differential - Final Drives - Rear
49.1gal (US)
Hydraulic System Factory Fill
125.5gal (US)
Coolant (Validated by Test Cell Fill Quantities)
33gal (US)
Transmission - Validated by Test Cell Fill Quantities
29gal (US)

Sound Performance – Tier 4 Final/Stage IV: Standard

Machine Sound Level (ISO 6395)
111dB(A)
Operator Sound Level (ISO 6396)
72dB(A)

Hydraulic System – Lift/Tilt

Cylinders, Double Acting: Lift, Bore and Stroke
210 mm × 1050 mm (8.7 in × 41.3 in)
Cylinders, Double Acting: Tilt, Bore and Stroke
269 mm × 685 mm (8.7 in × 27 in)
Maximum Flow at 1,400-1,860 rpm
153.0gal/min
Pilot System
Variable displacement piston
Relief Valve Setting – Lift/Tilt
4757psi

Sound Performance – Tier 4 Final/Stage IV: Suppression

Machine Sound Level (ISO 6395)
109dB(A)
Operator Sound Level (ISO 6396)
72dB(A)

Brakes

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

Hydraulic System - Lift/Tilt

Cylinders, Double Acting - Tilt, Bore and Stroke
269 mm × 685 mm (8.7 in × 27 in)
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Maximum Flow at 1,400-1,860 rpm
153gal/min
Pilot System
Variable displacement piston
Relief Valve Setting - Lift/Tilt
4757psi
Lift/Tilt System
Variable displacement piston
Maximum Flow
13.7gal/min
Relief Valve Setting
551psi
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.7 in × 41.3 in)

Hydraulic System - Steering

Maximum Flow
71.3gal/min
Steering Cycle Times - High Idle
3.4s
Steering Cycle Times - Low Idle
5.6s
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Total Steering Angle
86°
Relief Valve Setting - Steering
4351psi

Sound Performance - Tier 4 Final/Stage IV - Standard

Machine Sound Level (ISO 6395)
111dB(A)
Operator Sound Level (ISO 6396)
72dB(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: Standard

Operator Sound Level ( ISO 6396)
73dB(A)
Machine Sound Level (ISO 6395)
112dB(A)

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

Dump
2.2s
Lower Float Down
3.5s
Rack Back
4.5s
Raise
8s
Total Hydraulic Cycle Time - Empty Bucket
18.2s

Sound Performance – Tier 2 Equivalent/Stage II: Standard

Operator Sound Level (ISO 6396)
73dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Suppression

Operator Sound Level (ISO 6396)
72dB(A)
Machine Sound Level (ISO 6395)
110dB(A)

Standard 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 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 ACERT 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:

  • 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