US
Metric

Overview

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
541.00 hp
403.00 kW
Engine Model
Cat® C18 ACERT™
Net Power – SAE J1349
541.00 hp
403.00 kW
Bore
5.70 in
145.00 mm
Stroke
7.20 in
183.00 mm
Displacement
1105.00 in3
18.10 L
Torque Rise
58.00 %
58.00 %
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
580.00 HP
432.00 kW
Peak Power Speed
1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
580.00 HP
432.00 kW
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
588.00 HP
439.00 kW
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
541.00 HP
403.00 kW
Peak Torque - 1,200 rpm
2104.00 lb/ft
2852.00 N·m

Operating Specifications

Operating Weight
112574.00 lb
51062.00 kg
Rated Payload – Quarry Face
12.50 tons
11.30 tonnes
Rated Payload – Loose Material
16.00 tons
14.50 tonnes
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Cat Truck Match - Standard
770-772
Cat Truck Match - High Lift
773-775

Buckets

Bucket Capacities
4.7-13 m3 (6.2-17 yd3)

Transmission

Transmission Type
Cat planetary power shift
Forward 1
4.00 mph
6.50 km/h
Forward 2
7.20 mph
11.60 km/h
Forward 3
12.70 mph
20.40 km/h
Forward 4
21.60 mph
34.70 km/h
Reverse 1
4.70 mph
7.50 km/h
Reverse 2
8.30 mph
13.30 km/h
Reverse 3
14.40 mph
23.20 km/h
Direct Drive - Forward 1
Lock-up disabled
Direct Drive Forward 2
7.80 mph
12.50 km/h
Direct Drive - Forward 3
13.90 mile/h
22.30 km/h
Direct Drive - Forward 4
24.40 mile/h
39.30 km/h
Direct Drive Reverse 1
5.00 mph
8.00 km/h
Direct Drive Reverse 2
8.90 mph
14.30 km/h
Direct Drive - Reverse 3
15.80 mile/h
25.50 km/h

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
13°

Hydraulic System – Steering

Steering System – Circuit
Pilot, load sensing
Steering System – Pump
Piston, variable displacement

Hydraulic System - Steering

Relief Valve Setting - Steering
4351.00 psi
30000.00 kPa

Hydraulic System – Steering

Maximum Flow
71.30 gal/min
270.00 L/min
Steering Cycle Time (high idle)
3.40 sec
3.40 sec
Steering Cycle Time (low idle)
5.60 sec
5.60 sec
Total Steering Angle
86°

Service Refill Capacities

Fuel Tank
188.00 gal
712.00 L
Cooling System
31.70 gal
120.00 L
Crankcase
15.90 gal
60.00 L
Transmission
31.70 gal
120.00 L
Differentials and Final Drives – Front
49.10 gal
186.00 L
Differentials and Final Drives – Rear
49.10 gal
186.00 L
Hydraulic System (tank only)
63.40 gal
240.00 L
Diesel Exhaust Fluid Tank (for Tier 4 Final/Stage IV only)
8.70 gal
33.00 L
Hydraulic System Factory Fill
125.50 gal (US)
475.00 l

Sound Performance – Tier 4 Final/Stage IV: Standard

Operator Sound Level (ISO 6396)
72.00 dB(A)
72.00 dB(A)
Machine Sound Level (ISO 6395)
111.00 dB(A)
111.00 dB(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)

Hydraulic System - Lift/Tilt

Lift/Tilt System
Variable displacement piston
Maximum Flow
13.70 gal/min
52.00 l/min

Hydraulic System – Lift/Tilt

Maximum Flow at 1,400-1,860 rpm
153.00 gal/min
580.00 L/min
Pilot System
Variable displacement piston

Hydraulic System - Lift/Tilt

Relief Valve Setting
551.00 psi
3800.00 kPa
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.7 in × 41.3 in)

Hydraulic System – Lift/Tilt

Relief Valve Setting – Lift/Tilt
4757.00 psi
32800.00 kPa

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

Dump
2.20 s
2.20 s
Lower Float Down
3.50 s
3.50 s
Rack Back
4.50 s
4.50 s
Raise
8.00 s
8.00 s
Total Hydraulic Cycle Time - Empty Bucket
18.20 s
18.20 s

Sound Performance – Tier 4 Final/Stage IV: Suppression

Operator Sound Level (ISO 6396)
72.00 dB(A)
72.00 dB(A)
Machine Sound Level (ISO 6395)
109.00 dB(A)
109.00 dB(A)

Brakes

Brakes
SAE J1473 OCT90, ISO 3450:1992

Service Refill Capacities

Coolant (Validated by Test Cell Fill Quantities)
33.00 gal (US)
125.00 l
Transmission - Validated by Test Cell Fill Quantities
29.00 gal (US)
110.00 l

Sound Performance – Tier 2 Equivalent/Stage II: Standard

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

Sound Performance - Tier 2 Equivalent/Stage II: Standard

Machine Sound Level (ISO 6395)
112.00 dB(A)
112.00 dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Suppression

Operator Sound Level (ISO 6396)
72.00 dB(A)
72.00 dB(A)
Machine Sound Level (ISO 6395)
110.00 dB(A)
110.00 dB(A)

Engine

Net Power
541.00 HP
403.00 kW
Engine Model
Cat® C18 ACERT™
Bore
5.70 in
145.00 mm
Stroke
7.20 in
183.00 mm
Displacement
1105.00 in³
18.10 l
Torque Rise
58.00 %
58.00 %
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
541.00 HP
403.00 kW

Operating Specifications

Operating Weight
112574.00 lb
51062.00 kg
Rated Payload - Loose Material
16.00 t
14.50 t
Rated Payload - Quarry Face
12.50 t
11.30 t

Transmission

Transmission Type
Cat planetary power shift
Forward - 1
4.00 mile/h
6.50 km/h
Forward - 2
7.20 mile/h
11.60 km/h
Forward - 3
12.70 mile/h
20.40 km/h
Forward - 4
21.60 mile/h
34.70 km/h
Reverse - 1
4.70 mile/h
7.50 km/h
Reverse - 2
8.30 mile/h
13.30 km/h
Reverse - 3
14.40 mile/h
23.20 km/h
Direct Drive - Forward 2
7.80 mile/h
12.50 km/h
Direct Drive - Reverse 1
5.00 mile/h
8.00 km/h
Direct Drive - Reverse 2
8.90 mile/h
14.30 km/h

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
153.00 gal/min
580.00 l/min
Pilot System
Variable displacement piston
Relief Valve Setting - Lift/Tilt
4757.00 psi
32800.00 kPa

Service Refill Capacities

Fuel Tank
188.00 gal (US)
712.00 l
Cooling System
31.70 gal (US)
120.00 l
Crankcase
15.90 gal (US)
60.00 l
Transmission
31.70 gal (US)
120.00 l
Hydraulic System - Tank Only
63.40 gal (US)
240.00 l
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only)
8.70 gal (US)
33.00 l
Differential - Final Drives - Front
49.10 gal (US)
186.00 l
Differential - Final Drives - Rear
49.10 gal (US)
186.00 l

Buckets

Bucket Capacities
4.7-13 m3 (6.2-17 yd3)

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
13°

Brakes

Brakes
SAE J1473 OCT90, ISO 3450:1992

Hydraulic System - Steering

Maximum Flow
71.30 gal/min
270.00 l/min
Steering Cycle Times - High Idle
3.40 s
3.40 s
Steering Cycle Times - Low Idle
5.60 s
5.60 s
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Total Steering Angle
86°

Sound Performance - Tier 4 Final/Stage IV - Standard

Machine Sound Level (ISO 6395)
111.00 dB(A)
111.00 dB(A)
Operator Sound Level (ISO 6396)
72.00 dB(A)
72.00 dB(A)

Sound Performance - Tier 4 Final/Stage IV: Suppression

Machine Sound Level (ISO 6395)
109.00 dB(A)
109.00 dB(A)
Operator Sound Level (ISO 6396)
72.00 dB(A)
72.00 dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Standard

Operator Sound Level ( ISO 6396)
73.00 dB(A)
73.00 dB(A)
Features

Efficiency

Structures

Power Train

Hydraulics

Operator Station

Technology Solutions

Serviceability

Customer Support

Safety

Sustainability

System Match Efficiency

Bucket Ground Engaging Tools

Operating Costs

Sales Features

Efficiency

Delivering fuel efficiency you demand through integrated machine systems.

Structures

Best built for the toughest conditions.

Power Train

Move material more efficiently with improved power and control.

Hydraulics

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.

Serviceability

Enabling high uptime by reducing your service time.

Customer Support

Your Cat dealers know how to keep your machines productive.

Safety

Making your safety our priority.

Sustainability

Stewards of the environment.

System Match Efficiency

Efficient loading/hauling system starts with a perfect match.

Bucket Ground Engaging Tools

Protect your investment.

Operating Costs

Save Time and Money by Working Smart.
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