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.
Caterpillar
988K Wheel Loader Steel Mill Arrangement
Overview
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Exterior
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Interior
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Documents
Specifications
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Engine
Spec Value Net Power 541 HP Engine Model Cat® C18 ™ Net Power - SAE J1349 541 HP Bore 5.7 in Stroke 7.2 in Displacement 1105 in³ Torque Rise 58 % Rated Speed 1700/min Peak Power Speed - 1,500 rpm - Gross - ISO 14396 580 HP Gross - ISO 14396 580 HP Peak Power Speed 1500/min Peak Power Speed - 1,500 rpm - Gross - SAE J1995 588 HP Peak Torque - 1,200 rpm 2104 lb/ft Peak Power Speed - 1,500 rpm - Net Power - SAE J1349 541 HP Emissions Einhaltung von EPA Tier 4 Final (USA)/Stufe V (EU), Tier-2-konform -
Operating Specifications
Spec Value Operating Weight 112574 lb Rated Payload 12.5 t Rated Payload - Standard 12.5 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 Rated Payload - High Lift 12.5 t -
Transmission
Spec Value Transmission Type Cat-Planetenlastschaltgetriebe Forward - 1 4 mile/h Forward - 2 7.2 mile/h Forward - 3 12.7 mile/h Forward - 4 21.6 mile/h Reverse - 1 4.7 mile/h Reverse - 2 8.3 mile/h Reverse - 3 14.4 mile/h Direct Drive - Forward 1 Lock-up disabled Direct Drive - Forward 2 7.8 mile/h Direct Drive - Forward 3 13.9 mile/h Direct Drive - Forward 4 24.4 mile/h Direct Drive - Reverse 1 5 mile/h Direct Drive - Reverse 2 8.9 mile/h Direct Drive - Reverse 3 15.8 mile/h -
Hydraulic System - Lift/Tilt
Spec Value Pilot System Variable displacement piston Relief Valve Setting - Main 551 psi Maximum Flow 13.7 gal/min 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 Cylinders, Double Acting - Lift, Bore and Stroke 210 mm × 1050 mm (8.3 in × 41.3 in) Lift/Tilt System Variable displacement piston Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing Relief Valve Setting - Lift/Tilt 4757 psi -
Service Refill Capacities
Spec Value Fuel Tank 181 gal (US) Cooling System 31.7 gal (US) Crankcase 15.9 gal (US) Transmission 31.7 gal (US) Differential - Final Drives - Front 49.1 gal (US) Differential - Final Drives - Rear 49.1 gal (US) Hydraulic System - Tank Only 63.4 gal (US) Diesel Exhaust Fluid Tank (Tier 4) 8.7 gal (US) Hydraulic System Factory Fill 125.5 gal (US) -
Buckets
Spec Value Bucket Capacities 5.4-6.3 m3 (7.0-8.3 yd3) -
Axles
Spec Value Front Fixed Rear Trunnion Oscillation Angle ±6° -
Brakes
Spec Value Brakes SAE J1473 OKT90, ISO 3450:1992 -
Hydraulic System - Steering
Spec Value Steering System - Circuit Pilot, load sensing Steering System - Pump Piston, variable displacement Relief Valve Setting - Steering 4351 psi Maximum Flow 71.3 gal/min Steering Cycle Times - Low Idle 5.6 s Total Steering Angle 80 ° Steering Cycle Times - High Idle 3.4 s -
Hydraulic Cycle Time (1,400-1,860 rpm)
Spec Value Rack Back 4.5 s Lower Float Down 3.5 s Raise 8 s Total Hydraulic Cycle Time - Empty Bucket 18.2 s Dump 2.2 s -
Sound Performance - Standard
Spec Value Operator Sound Level (ISO 6396) 71 dB(A) Machine Sound Level (ISO 6395) 111 dB(A) -
Sound Performance - Suppression
Spec Value Operator Sound Level (ISO 6396) 70 dB(A) Machine Sound Level (ISO 6395) 109 dB(A)
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
- 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
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
- 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