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Overview

The 558 features enhanced performance coupled with ultimate machine efficiency. Cat® components, purpose built upper and lower frames, and application specific linkage configurations increase machine up time and lower machine operating costs.

Engine

  • Engine Model Cat C7.1 ACERT Cat C7.1 ACERT
  • Net Flywheel Power 239.0 HP 178.0 kW
  • Gross Power 239.0 HP 178.0 kW
  • Displacement 428.0 in³ 7.01 l
  • Engine Speed - Operation 1750.0 r/min 1750.0 r/min
  • Engine Speed - Travel 1800.0 r/min 1800.0 r/min
  • Gross Power at 2,200 rpm 239.0 HP 178.0 kW
  • Number of Cylinders 6 6

Weights

  • Estimated Operating Weight without Attachment: General Forestry (Reach) 85239.0 lb 38664.0 kg

Service Refill Capacities

  • Cooling System 7.9 gal (US) 30.0 l
  • Swing Drive 2.9 gal (US) 11.0 l
  • Hydraulic Tank 46.2 gal (US) 175.0 l
  • DEF Tank 12.2 gal (US) 46.0 l
  • Engine Crankcase 6.3 gal (US) 24.0 l
  • Final Drive - Each 2.9 gal (US) 11.0 l
  • Fuel Tank - CWT 261.4 gal (US) 989.3 l
  • Hydraulic System - Total 81.9 gal (US) 310.0 l

Hydraulic System

  • Auxiliary Pump - Reach with Rotate: Maximum Flow 37.2 gal/min 141.0 l/min
  • Auxiliary Pump - Reach with Rotate: Maximum Pressure 1499.0 psi 10335.0 kPa
  • Auxiliary Pump - Reach with Rotate: Pump Drive Gear Ratio 1.28:1 1.28:1
  • Main Pumps - Maximum Flow - Both Pumps 126.8 gal/min 480.0 l/min
  • Main Pumps - Maximum Flow - Per Pump 63.4 gal/min 240.0 l/min
  • Maximum System Pressure - Heavy Lift Mode 5511.0 psi 38000.0 kPa
  • Maximum System Pressure - Implements 5076.0 psi 35000.0 kPa
  • Maximum System Pressure - Swing 4641.0 psi 32000.0 kPa
  • Maximum System Pressure - Travel 5076.0 psi 35000.0 kPa

Operating Specifications

  • Maximum Drawbar Pull 72164.0 lbf 321.0 kN
  • Maximum Speed - Rabbit 2.3 mile/h 3.7 km/h
  • Maximum Speed - Turtle 1.5 mile/h 2.4 km/h
  • Maximum Swing Speed (GF) 7.5 r/min 7.5 r/min
  • Swing Torque (GF) 74494.0 ft·lbf 101.0 kN·m

Undercarriage

  • Ground Clearance 29.5 in 749.0 mm
  • Track Gauge 115.0 in 2921.0 mm
  • Track Length 199.7 in 5072.0 mm
  • Undercarriage Pitch 8.5 in 215.9 mm

Dimensions - General Forestry - Boom Stretched Out

  • Boom Height 146.5 in 3720.0 mm
  • Distance Between Idler and Sprocket Centerline 158.2 in 4019.0 mm
  • Ground Clearance 29.5 in 749.0 mm
  • Height of Tilted Side Entry Cab 137.7 in 3498.0 mm
  • Overall Height 164.5 in 4178.0 mm
  • Overall Length (Reach) 499.2 in 12680.0 mm
  • Tail Swing Radius 143.8 in 3653.0 mm
  • Track Gauge 115.0 in 2921.0 mm
  • Track Length 199.7 in 5072.0 mm
  • Width - With 700 mm (28 in) Shoes 142.6 in 3621.0 mm

Performance

  • Cat 178 kW (239 hp) C7.1 ACERT™ Tier 4 Final engine with increased horsepower maintains maximum performance under load
  • Strong hydraulic horsepower for efficient implement performance and greater productivity
  • An increase in swing torque of 17 percent on General Forestry models, provides added power to move trees, which enables more efficiency and productivity
  • Heavy lift mode features increased lift capacity to handle larger payloads with improved control
  • 989 L (261 gal) counterweight fuel tank for extended machine operation and maximum uptime
  • Machine width and track length designed for stability in varied logging applications

Efficiency

  • Engine, hydraulics, and work tool integration are optimized to minimize power losses and increase overall machine efficiency
  • Steady state high idle speed and U.S. EPA Tier 4 Final technology reduce fuel consumption
  • Larger hydraulic pump allows engine to operate at lower rpms with increased performance to maximize efficiency
  • Component layout and back-to-back main hydraulic control valve reduce oil flow restrictions and aid in greater fuel economy
  • Machine designed for integration and optimization with Cat grapples
  • Powerful, multi-functioning hydraulics, combined with strong machine performance ensure work tools function quickly and smoothly to complete work faster

Application Versatility

  • Boom arrangements and hydraulic systems for specific applications enable more effective road building, loading, processing, shoveling, or millyard stacking
  • New track option meets shovel logging application requirements
  • Purpose built processor cab option that includes 19 mm (0.75 in) front windows

Reliability and Durability

  • Variable pitch, reversing cooling fan maintains optimum fluid temperature in heavy duty forestry applications
  • Cooling capacity increased 33 percent for trouble-free operation
  • Purpose built upper frame, high-wide carbody, robust linkage configurations, and heavy-duty enclosures are reinforced with thick doubler plates, extra gussets, and other reinforcements for structural integrity in severe applications
  • Large, 216 mm (8.5 in) pitch (349 HEX), grease lubricated tracks, provide excellent life in variable forestry working conditions
  • Validated and proven excavator technologies ensure overall machine reliability

Serviceability

  • One-piece engine hood design, with two opening angles, allows easy access to engine and cooling compartments
  • Side-by-side engine and hydraulic coolers are easy to access for cleaning, while reduced cooling fins per inch allows better debris flow-through and reduced clogging potential
  • 0.71 m3 (25 ft3) of storage space at ground level, provides ready access to tools, equipment, and supplies that operators use daily

Operator Comfort and Technology

  • Premium fit and finishes to maximize operator experience
  • Fully adjustable, air ride cab seat that includes heating and cooling capability for comfort and reduced operator fatigue
  • LED lights increase visibility
  • Rear entry cab option provides safe access through a fully lit platform through the use of a key FOB
  • Rear entry cab window design improves visibility for shovel logging and other applications
  • Rear entry cab includes a new innovative cab lock down system that minimizes transport time and improves uptime
  • Tool control as standard equipment for swapping and selecting tools quickly and efficiently
  • Cat Product Link™ allows for remote location of a machine and enables tracking of fuel consumption and other events

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