336 Excavator

  • Specs Summary


The Cat® XQ425 provides world class performance and enhanced usability. This model is powered by the fuel-efficient Cat C13 ACERT® engine equipped with the Cat NOx Reduction System. Equipped with the new EMCP 4.4 control panel, the XQ425 features a user-friendly interface and automatic generator set paralleling. A principle advantage of the control system offers simpler and faster voltage changes. Providing greater flexibility when moving between multiple job sites with differing frequency and voltage needs, the auto-configuration capability eliminates the time required when reprogramming units and potential errors. Additional features include lower noise levels and improved part load fuel consumption.

Standard Equipment

Air Inlet

  • Air cleaner, two stage cyclonic/paper with dust cup and service indicator

Charging System

  • UL/CSA listed 120 V, 20 Amp battery charger, shock mounted and enclosed in dust proof housing

Control Panel

  • EMCP 4.2 genset mounted controller

Cooling System

  • Package mounted radiator with vertical air discharge provides 43° C ambient capability at prime +10% rating

Distribution System

  • NEMA 1 steel enclosure, separate hinged, lockable door with rust resistant pinned hinges


  • Sound attenuating, 12 gauge sheet metal enclosure limits overall noise to 77 dB(A) @ 7m (23')


  • EPA Tier 4 Final certified Cat C13 ATAAC heavy duty diesel engine

Clean Emissions Module

  • Cat Clean Emissions Module comes with integrated DOC, DPF & SCR and is located in separate compartment

DEF System

  • 12 gal plastic DEF tank provides 24 Hrs run time @ 75 % Prime + 10% rating similar to fuel system. DEF tank is equipped with integrated pump, level sensor to display the DEF level in EMCP panel and electrically heated lines from DEF tank to CEM. Equipped with Low and critically low level alarms with a critically low shutdown

Fuel System

  • 520 gal (1970 L) double wall fuel tank, UL142, ULC, and Transport Canada certified, 27 hr runtime @ 75% prime +10% rating, internal fuel fill


  • SR4B 450 frame, three-phase, random wound, 12-lead design, permanent magnet excited, 0.750 pitch

Lube System

  • Pump, integral oil cooler, lube oil, filter, filler and dipstick, and oil sampling valve

Mounting System

  • Generator set soft mounted to the heavy duty, fabricated steel base frame

Starting System

  • Single electric starting motor, 24V


  • Canadian Standards Authority (CSA) certified

Optional Equipment


  • Simple user friendly interface and navigation
  • Automatic set-point adjustment integrated with voltage and frequency selection
  • UL508A recognized
  • Convenient service access for Cat Service tools (not included)
  • Integration with the Cat DVR provides enhanced system monitoring
  • Ability to view and reset diagnostics of all controls networked on primary CAN datalink eliminates need for separate service tools for troubleshooting
  • True RMS AC metering, 3 phase
  • Multiple stored setpoint group selection via switched input eliminates need to reprogram control when switching voltages and frequencies


  • Controls
  • Digital indication for
  • Shutdowns with common indicating light for
  • Emergency stop pushbutton
  • Panel illuminating lights
  • Display navigation keys including two shortcut keys for Engine Parameters, Generator Parameters, Control and main menu
  • Fuel level monitoring and control


  • Generator protective features provided by EMCP 4.4


  • Provides for
  • Single Unit Stand-Alone Mode
  • Multi-Unit Mode