New CAT Equipment

988K Wheel Loader Steel Mill Arrangement

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.

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    Learn more about the 988K Wheel Loader Steel Mill Arrangement

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    Product Specs

    Engine

    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 IV (EU), Tier-2-konform

    Operating Specifications

    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

    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

    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

    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

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

    Axles

    Front Fixed
    Rear Trunnion
    Oscillation Angle ±6°

    Brakes

    Brakes SAE J1473 OKT90, ISO 3450:1992

    Hydraulic System - Steering

    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)

    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

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

    Sound Performance - Suppression

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