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988K Wheel Loader Steel Mill Arrangement

988K Wheel Loader Steel Mill Arrangement

At a Glance

Net Power
541 HP
Operating Weight
112574 lb
Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)
Engine Model
Cat® C18 ACERT™
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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

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Net Power 541HP
Engine Model Cat® C18 ACERT™
Net Power - SAE J1349 541HP
Bore 5.7in
Stroke 7.2in
Displacement 1105in³
Torque Rise 58%
Rated Speed 1,700 rpm
Gross - ISO 14396 580HP
Peak Power Speed 1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396 580HP
Peak Power Speed - 1,500 rpm - Gross - SAE J1995 588HP
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349 541HP
Peak Torque - 1,200 rpm 2104lb/ft
Emissions U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent

Operating Specifications

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Operating Weight 112574lb
Rated Payload 12.5t
Rated Payload - Standard 12.5t
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 12.5t

Buckets

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

Transmission

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Transmission Type Cat planetary power shift
Forward - 1 4mile/h
Forward - 2 7.2mile/h
Forward - 3 12.7mile/h
Forward - 4 21.6mile/h
Reverse - 1 4.7mile/h
Reverse - 2 8.3mile/h
Reverse - 3 14.4mile/h
Direct Drive - Forward 1 Lock-up disabled
Direct Drive - Forward 2 7.8mile/h
Direct Drive - Forward 3 13.9mile/h
Direct Drive - Forward 4 24.4mile/h
Direct Drive - Reverse 1 5mile/h
Direct Drive - Reverse 2 8.9mile/h
Direct Drive - Reverse 3 15.8mile/h

Axles

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Front Fixed
Rear Trunnion
Oscillation Angle ±6°

Hydraulic System - Steering

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Steering System - Circuit Pilot, load sensing
Steering System - Pump Piston, variable displacement
Relief Valve Setting - Steering 4351psi
Maximum Flow 71.3gal/min
Steering Cycle Times - High Idle 3.4s
Steering Cycle Times - Low Idle 5.6s
Total Steering Angle 80°

Service Refill Capacities

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Fuel Tank 181gal (US)
Cooling System 31.7gal (US)
Crankcase 15.9gal (US)
Transmission 31.7gal (US)
Differential - Final Drives - Front 49.1gal (US)
Differential - Final Drives - Rear 49.1gal (US)
Hydraulic System - Tank Only 63.4gal (US)
Diesel Exhaust Fluid Tank (Tier 4) 8.7gal (US)
Hydraulic System Factory Fill 125.5gal (US)

Hydraulic System - Lift/Tilt

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Lift/Tilt System Variable displacement piston
Maximum Flow 13.7gal/min
Relief Valve Setting 551psi
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 153gal/min
Pilot System Variable displacement piston
Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt 4757psi

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

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

Sound Performance - Standard

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

Sound Performance - Suppression

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

Brakes

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Brakes SAE J1473 OCT90, ISO 3450:1992