988K Wheel Loader

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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.
  • Standard Equipment
  • Optional Equipment
  • Specs

Standard Equipment

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • 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 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

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • 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

Specs

Overview

Long Name:
988K Wheel Loader
Name:
988K
Brand:
Caterpillar
Status:
Current

Engine

Net Power:
541 HP / 403 kW
Engine Model:
Cat® C18 ™
Bore:
5.7 in / 145 mm
Stroke:
7.2 in / 183 mm
Displacement:
1105 in³ / 18.1 l
Torque Rise:
58 % / 58 %
Rated Speed:
1700/min
Peak Torque - 1,200 rpm:
2104 lb/ft / 2852 N·m
Net Power - SAE J1349:
541 HP / 403 kW
Peak Power Speed:
1500/min
Peak Power Speed - 1,500 rpm - Gross - ISO 14396:
580 HP / 432 kW
Gross - ISO 14396:
580 HP / 432 kW
Peak Power Speed - 1,500 rpm - Gross - SAE J1995:
588 HP / 439 kW
Emissions:
U.S. EPA Tier 4 Final/EU Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349:
541 HP / 403 kW

Operating Specifications

Operating Weight:
112574 lb / 51062 kg
Bucket Capacity Range:
4.7-13 m3 (6.2-17 yd3)
Rated Payload - Quarry Face:
12.5 t / 11.3 t
Cat Truck Match - High Lift:
773~775
Rated Payload - Loose Material:
16 t / 14.5 t
Cat Truck Match - Standard:
770~772

Transmission

Transmission Type:
Cat-Planetenlastschaltgetriebe
Forward - 1:
4 mile/h / 6.5 km/h
Forward - 2:
7.2 mile/h / 11.6 km/h
Forward - 3:
12.7 mile/h / 20.4 km/h
Forward - 4:
21.6 mile/h / 34.7 km/h
Reverse - 1:
4.7 mile/h / 7.5 km/h
Reverse - 2:
8.3 mile/h / 13.3 km/h
Reverse - 3:
14.4 mile/h / 23.2 km/h
Direct Drive - Reverse 2:
8.9 mile/h / 14.3 km/h
Direct Drive - Reverse 3:
15.8 mile/h / 25.5 km/h
Direct Drive - Forward 2:
7.8 mile/h / 12.5 km/h
Direct Drive - Reverse 1:
5 mile/h / 8 km/h
Direct Drive - Forward 1:
Lock-up disabled
Direct Drive - Forward 3:
13.9 mile/h / 22.3 km/h
Direct Drive - Forward 4:
24.4 mile/h / 39.3 km/h

Hydraulic System - Lift/Tilt

Maximum Flow:
13.7 gal/min / 52 l/min
Maximum Flow at 1,400-1,860 rpm:
153 gal/min / 580 l/min
Lift/Tilt System:
Variable displacement piston
Cylinders, Double Acting - Tilt, Bore and Stroke:
269 mm × 685 mm (8.7 in × 27 in)
Relief Valve Setting - Main:
551 psi / 3800 kPa
Relief Valve Setting - Lift/Tilt:
4757 psi / 32800 kPa
Pilot System:
Variable displacement piston
Cylinders, Double Acting - Lift, Bore and Stroke:
210 mm × 1050 mm (8.7 in × 41.3 in)
Lift/Tilt System - Circuit:
EH- Positive Flow Control, Flow Sharing

Service Refill Capacities

Fuel Tank:
188 gal (US) / 712 l
Cooling System:
31.7 gal (US) / 120 l
Crankcase:
15.9 gal (US) / 60 l
Transmission:
31.7 gal (US) / 120 l
Hydraulic System - Tank Only:
63.4 gal (US) / 240 l
Differential - Final Drives - Rear:
49.1 gal (US) / 186 l
Hydraulic System Factory Fill:
125.5 gal (US) / 475 l
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only):
8.7 gal (US) / 33 l
Differential - Final Drives - Front:
49.1 gal (US) / 186 l

Buckets

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

Axles

Front:
Fixed
Rear:
Trunnion
Oscillation Angle:
13 °

Brakes

Brakes:
SAE J1473 OKT90, ISO 3450:1992

Hydraulic System - Steering

Steering System - Pump:
Piston, variable displacement
Total Steering Angle:
86 °
Maximum Flow:
71.3 gal/min / 270 l/min
Relief Valve Setting - Steering:
4351 psi / 30000 kPa
Steering Cycle Times - High Idle:
3.4 s / 3.4 s
Steering System - Circuit:
Pilot, load sensing
Steering Cycle Times - Low Idle:
5.6 s / 5.6 s

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

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

Sound Performance - Tier 4 Final/Stage IV - Standard

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

Sound Performance - Tier 4 Final/Stage IV: Suppression

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

Sound Performance - Tier 2 Equivalent/Stage II: Suppression

Operator Sound Level (ISO 6396):
72 dB(A) / 72 dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Standard

Machine Sound Level (ISO 6395):
112 dB(A) / 112 dB(A)

Sound Performance - Tier 2 Equivalent/Stage II: Suppression

Machine Sound Level (ISO 6395):
110 dB(A) / 110 dB(A)

Service Refill Capacities

Coolant (Validated by Test Cell Fill Quantities):
33 gal (US) / 125 l
Transmission - Validated by Test Cell Fill Quantities:
29 gal (US) / 110 l

Sound Performance - Tier 2 Equivalent/Stage II: Standard

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