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Woodward 9902-701

Product Name:​ GE LM6000 Gas Turbine Hydraulic Control Unit (HCU) — Variant of 9902-364
Product Introduction:​ The 9902-701 belongs to the same Woodward HCU family as the 9902-364 for the GE LM6000 gas turbine, with identical functional positioning. It is an order variant or improved version of 9902-364, corresponding to different engine package configurations (such as PF+, SPRINT versions) or different factory calibration parameters.
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Detailed content

Technical Specifications:
  • Application: GE LM6000 series (including PC/PF/PF+/SPRINT, etc.)
  • Hydraulic fluid: MIL-L-23699 or MIL-L-7808
  • Maximum supply flow: 167 L/min
  • Maximum supply pressure: 8619 kPa (1250 psig)
  • Normal return pressure: 690 kPa
  • Operating temperature: –7 to +66 °C (normal); –40 to +121 °C (extreme)
  • Dry weight: Approximately 27 kg
  • Channels: Dual-channel
  • Architecture: Same dual-channel redundant hydraulic servo control as 9902-364, with three-coil redundant torque motor servovalve; independent oil filter and test interface
  • Nameplate: Part number 9902-701, some batches labeled with TFM1-9902-701 prefix
Functional Features:​ Identical dual-channel redundant hydraulic servo control architecture to 9902-364; different suffixes correspond to different engine package calibration parameters.
Application Scenarios:​ LM6000 unit overhaul replacement; compatible retrofit projects across package variants; hydraulic control for different LM6000 configurations (PC/PF/PF+/VELOX).
Structural Characteristics:​ Outline consistent with 9902-364, dual-channel symmetrical layout; unique serial number identification on nameplate.
Working Principle:​ Same as 9902-364 — electronic controller drives torque motor servovalve to regulate hydraulic oil flow, actuating VSV or bleed valve actuators; independent oil filtration ensures servovalve oil cleanliness.
Installation Requirements:
  • Refer to 9902-364 installation drawings (drawing numbers may differ)
  • Execute hydraulic piping and electrical wiring per corresponding version drawings
  • Re-calibrate servovalve zero after installation
Usage Precautions:
  • When interchanging with 9902-364, verify nameplate suffix and wiring diagram version
  • Calibration parameters differ across package versions; use of uncalibrated units is prohibited
  • Other precautions are identical to those for 9902-364

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