988K Wheel Loader Steel Mill Arrangement

Overview
Net Power
541 hp
Operating Weight
112,574 lb
Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)
  • Exterior View
  • Interior View

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
541 hp
Engine Model
Cat® C18 ACERT™
Net Power - SAE J1349
541 hp
Bore
6 in
Stroke
7 in
Displacement
1,105 in3
Torque Rise
58 %
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent
Gross - ISO 14396
580 HP
Peak Power Speed
1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
580 HP
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
588 HP
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
541 HP
Peak Torque - 1,200 rpm
2,104 lb/ft
Net Power
541 HP
Engine Model
Cat® C18 ACERT™
Net Power - SAE J1349
541 HP
Bore
6 in
Stroke
7 in
Displacement
1,105 in³
Torque Rise
58 %
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent

Operating Specifications

Operating Weight
112,574 lb
Rated Payload
13 tons
Rated Payload - High Lift
13 tons
Rated Payload - Standard
13 t
Bucket Capacity Range
6.4-7.6 m3 (8.3-10 yd3)
Cat Truck Match - Standard
770-772
Cat Truck Match - High Lift
773-775
Operating Weight
112,574 lb
Rated Payload
13 t
Rated Payload - High Lift
13 t

Buckets

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

Transmission

Transmission Type
Cat planetary power shift
Forward 1
4 mph
Forward 2
7 mph
Forward 3
13 mph
Forward 4
22 mph
Reverse 1
5 mph
Reverse 2
8 mph
Reverse 3
14 mph
Direct Drive - Forward 2
8 mph
Direct Drive - Reverse 1
5 mph
Direct Drive - Reverse 2
9 mph
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 3
14 mile/h
Direct Drive - Forward 4
24 mile/h
Direct Drive - Reverse 3
16 mile/h
Transmission Type
Cat planetary power shift
Forward - 1
4 mile/h
Forward - 2
7 mile/h
Forward - 3
13 mile/h
Forward - 4
22 mile/h
Reverse - 1
5 mile/h
Reverse - 2
8 mile/h
Reverse - 3
14 mile/h
Direct Drive - Forward 2
8 mile/h
Direct Drive - Reverse 1
5 mile/h
Direct Drive - Reverse 2
9 mile/h

Axles

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

Hydraulic System - Steering

Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Maximum Flow
71 gal/min
Steering Cycle Time (high idle)
3 Seconds
Steering Cycle Time (low idle)
6 Seconds
Total Steering Angle
80 Degrees
Relief Valve Setting - Steering
4,351 psi
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Maximum Flow
71 gal/min
Steering Cycle Times - High Idle
3 s
Steering Cycle Times - Low Idle
6 s
Total Steering Angle
80 °

Service Refill Capacities

Fuel Tank
181 gal
Cooling System
32 gal
Crankcase
16 gal
Transmission
32 gal
Differentials and Final Drives - Front
49 gal
Differentials and Final Drives - Rear
49 gal
Hydraulic System (tank only)
63 gal
Diesel Exhaust Fluid Tank (Tier 4)
9 gal (US)
Hydraulic System Factory Fill
126 gal (US)
Fuel Tank
181 gal (US)
Cooling System
32 gal (US)
Crankcase
16 gal (US)
Transmission
32 gal (US)
Differential - Final Drives - Front
49 gal (US)
Differential - Final Drives - Rear
49 gal (US)
Hydraulic System - Tank Only
63 gal (US)

Sound Performance - Standard

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

Hydraulic System - Lift/Tilt

Cylinders, Double Acting: Lift, Bore and Stroke
210 mm × 1050 mm (8.3 in × 41.3 in)
Cylinders, Double Acting: Tilt, Bore and Stroke
267 mm × 685 mm (10.5 in × 27.0 in)
Maximum Flow at 1,400-1,860 rpm
153 gal/min
Pilot System
Variable displacement piston
Relief Valve Setting - Lift/Tilt
4,757 psi
Lift/Tilt System
Variable displacement piston
Maximum Flow
14 gal/min
Relief Valve Setting
551 psi
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.3 in × 41.3 in)
Cylinders, Double Acting - Tilt, Bore and Stroke
267 mm × 685 mm (10.5 in × 27.0 in)
Maximum Flow at 1,400-1,860 rpm
153 gal/min
Pilot System
Variable displacement piston
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt
4,757 psi

Sound Performance - Suppression

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

Brakes

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

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

Dump
2 s
Lower Float Down
4 s
Rack Back
5 s
Raise
8 s
Total Hydraulic Cycle Time - Empty Bucket
18 s

Efficiency

Structures

Power Train

Hydraulics

Operator Station

Technology Solutions

Serviceability

Customer Support

Safety

Steel Mill Features

Buckets and Ground Engaging Tools

Operating Costs

  • 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
    • Transmission lockout
  • 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, 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, 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
  • 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
  • Power Train
    • 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)
  • Operator Environment
    • Cab precleaner
    • AM/FM/CD/MP3 radio
    • Satellite Sirius radio with bluetooth
    • LED warning strobe
    • CB radio ready
    • Window pull down visor
  • Miscellaneous Attachments
    • Front and rear roading fenders
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