{
  "glb": "/models/components/987/trans.glb",
  "parts": [
    {
      "id": "pdk-transaxle",
      "node": "gearCase",
      "label": "PDK Transaxle Case (CG2.00 / CG2.20)",
      "assembly": "Gearbox",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "componentId": "trans",
      "function": "Main alloy case of the 7-speed Porsche Doppelkupplung introduced on the 987.2 (2009): type CG2.00 on Boxster/Cayman, CG2.20 on the S models. Houses both part-transmissions, the shafts and the final drive. 987.1 cars use a Tiptronic S automatic or a manual gearbox instead."
    },
    {
      "id": "pdk-hsg-001",
      "node": "pdkBellhousing",
      "label": "PDK Bellhousing / Transmission Case (Main)",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Aluminium alloy structural case enclosing the PDK gear set and clutch assembly. Contains two separate oil chambers: hydraulic/clutch oil and gear-wheel oil, split because of the high shearing strains in the differential (2009 Service Introduction, p66)."
    },
    {
      "id": "pdk-hsg-002",
      "node": "pdkEndCover",
      "label": "PDK End Cover / Rear Cover",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Rear closing plate that seals the transmission case and provides bearing support at the tail end."
    },
    {
      "id": "pdk-hsg-003",
      "node": "pdkOilPan",
      "label": "PDK Oil Pan (Hydraulic-Oil Chamber)",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Lower sump of the hydraulic-oil chamber: 5.2 l of Pentosin FFL 3 hydraulic oil for the clutches, actuators and cooling, changed every 90,000 km (56,000 mi). The hydraulic control unit is installed in the oil pan area."
    },
    {
      "id": "pdk-hsg-004",
      "node": "pdkOilPan2",
      "label": "PDK Oil Pan (Alternate / Revised Sump)",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-003",
      "partNumber": null,
      "function": "Revised-specification lower sump used on later production runs; check production date before ordering."
    },
    {
      "id": "pdk-hsg-005",
      "node": "pdkHousingNeck",
      "label": "PDK Housing Filler Neck",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-003",
      "partNumber": null,
      "function": "Filler neck on the transmission case through which PDK fluid is added. Level is set via oil overflow bores — one for the hydraulic oil (engine idling, PIWIS in Oil fill mode, within 5 minutes) and one on the opposite side for the gear-wheel oil."
    },
    {
      "id": "bell-housing",
      "node": "bellHousing",
      "label": "Clutch / Bell Housing",
      "assembly": "Gearbox",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Bell housing at the engine end that encloses the wet double clutch and mates to the engine. The engine/transmission flange shape was redesigned for the 987.2 engine generation, with a reinforced ribbed case structure behind it."
    },
    {
      "id": "bell-flange",
      "node": "bellFlange",
      "label": "Engine Mounting Flange / Retaining Plate",
      "assembly": "Gearbox",
      "system": "Transmission",
      "tier": "sub",
      "parent": "bell-housing",
      "partNumber": null,
      "function": "Bolt flange / retaining plate that secures the PDK bellhousing to the rear face of the engine block."
    },
    {
      "id": "pdk-cl-001",
      "node": "pdkDualClutchPack",
      "label": "Wet Double Clutch (K1 Ø202 mm + K2 Ø153 mm)",
      "assembly": "Dual Clutch",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Radially arranged wet multi-plate clutch pair: outer clutch K1 (Ø202 mm) drives inner input shaft 1 for gears 1-3-5-7 + reverse; inner clutch K2 (Ø153 mm) drives hollow input shaft 2 for gears 2-4-6. Both clutches are open when depressurised, so the parking lock or brake must hold the car."
    },
    {
      "id": "pdk-cl-002",
      "node": "pdkClutchActuatorCylinder",
      "label": "Clutch Hydraulic Actuation Pistons",
      "assembly": "Dual Clutch",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Hydraulic actuation for each clutch pack (one circuit per part-transmission), pressurised by the hydraulic control unit. Clutch cooling flow is regulated between 0 and approx. 40 l/min by a cooling valve on the HCU."
    },
    {
      "id": "pdk-cl-003",
      "node": "pdkTorsionalDamper",
      "label": "Dual-Mass Flywheel",
      "assembly": "Dual Clutch",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Engine torque is transmitted into the PDK clutches via a dual-mass flywheel (2009 Service Introduction, p90), which decouples engine torsional vibration from the driveline. Manual 987s use a dual-mass flywheel with a single-plate dry clutch (240 mm pressure plate; self-adjusting X-Tend clutch on S models)."
    },
    {
      "id": "transaxle-new-001",
      "node": "pdkReleaseBearing",
      "label": "Clutch Release Bearing",
      "assembly": "Dual Clutch",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-cl-002",
      "partNumber": null,
      "function": "Support bearing at the clutch actuation pistons that transfers hydraulic apply force into the rotating clutch packs."
    },
    {
      "id": "pdk-gear-001",
      "node": "pdkInputShaft1",
      "label": "Input Shaft 1 (Inner — Gears 1-3-5-7 + Reverse)",
      "assembly": "Gear Shafts",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Solid inner input shaft driven by outer clutch K1. Carries 1st, 3rd, 5th, 7th and the reverse drive gear (2009 Service Introduction, p80/89). Not serviceable separately — supplied with the complete PDK unit."
    },
    {
      "id": "pdk-gear-002",
      "node": "pdkInputShaft2",
      "label": "Input Shaft 2 (Outer, Hollow — Gears 2-4-6)",
      "assembly": "Gear Shafts",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Hollow outer input shaft concentric with shaft 1, driven by inner clutch K2, carrying 2nd, 4th and 6th gears. Not serviceable separately."
    },
    {
      "id": "pdk-gear-003",
      "node": "pdkOutputLayShafts",
      "label": "Main Shaft & Pinion Shaft",
      "assembly": "Gear Shafts",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "The gear wheel set comprises the two input shafts, the main shaft, the pinion shaft and the intermediate gear wheel for reverse (Fig 3_69_09). The main and pinion shafts receive torque from the selected gear pair and deliver it to the hypoid final drive."
    },
    {
      "id": "pdk-gear-004",
      "node": "pdkGearSets",
      "label": "Gear Sets (1st–7th + Reverse)",
      "assembly": "Gear Shafts",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Seven forward gear pairs plus reverse via an intermediate gear wheel. Ratios (987.2 PDK): 1st 3.91, 2nd 2.29, 3rd 1.65, 4th 1.30, 5th 1.08, 6th 0.88, 7th 0.62, reverse 3.55 (identical for base and S; only the spur-gear drive differs: 1.146 vs 1.114)."
    },
    {
      "id": "pdk-gear-005",
      "node": "pdkSynchronizerRings",
      "label": "Synchronizer Hubs & Shift Sleeves",
      "assembly": "Gear Shafts",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Fully synchronized shift-sleeve sets on both part-transmissions that match shaft speeds before engagement, allowing the next gear to be pre-selected while driving."
    },
    {
      "id": "pdk-gear-006",
      "node": "pdkSelectorForks",
      "label": "Shift Rods & Forks (x4)",
      "assembly": "Gear Shafts",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Four hydraulically actuated shift rods, each switching two gears (4/6, 5/7, 1/3 and 2/reverse). Rods are locked in neutral and end positions, held by detents, and each carries a sensor magnet read by the distance-sensor tower (2009 Service Introduction, p87/98)."
    },
    {
      "id": "pdk-hcu-001",
      "node": "pdkValveBody",
      "label": "Hydraulic Control Unit / Valve Body",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Hydraulic switching device in the oil pan area: port plate, intermediate plate and valve housing with 16 valves — system-pressure, gear valves EDS5/6, clutch valves EDS1/2, clutch selector EDS3, pressure control EDS4, cylinder/transmission selection, cooling and switch-over valves. Controls clutches, actuators, cooling flow and the parking-lock hydraulics."
    },
    {
      "id": "pdk-hcu-002",
      "node": "pdkShiftSolenoids",
      "label": "Solenoid Valves & EDS Pressure Regulators",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Two on/off solenoid valves plus proportional EDS pressure regulators on the valve body that modulate hydraulic pressure for clutch engagement, gear selection and cooler flow (Figs 3_45_09 / 3_83_09)."
    },
    {
      "id": "pdk-hcu-002b",
      "node": "pdkSolenoidConnector",
      "label": "Transmission Connector (16-pin)",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hcu-002",
      "partNumber": null,
      "function": "Case connector through which the distance and rpm sensor lines are led outwards; the internally-wired temperature sensor exits via a separate 20-pin connector (2009 Service Introduction, p97)."
    },
    {
      "id": "pdk-hcu-003",
      "node": "pdkFluidPump",
      "label": "Transmission Oil Pump",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Internal pump that supplies the hydraulic control unit with oil for the actuators, clutches, actuating cylinders, cooling and lubrication system (2009 Service Introduction, p93)."
    },
    {
      "id": "pdk-hcu-004",
      "node": "pdkFluidFilter",
      "label": "PDK Fluid Filter and Oil Strainer",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Filter assembly that removes particulate contamination from the PDK hydraulic-oil circuit. Serviced with the hydraulic-oil change (every 90,000 km / 56,000 mi)."
    },
    {
      "id": "pdk-hcu-005",
      "node": "pdkFluidTempSensor",
      "label": "PDK Fluid Temperature Sensor",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Temperature sensor permanently wired to the internal harness (led out via the 20-pin connector). Like all PDK sensors it is located inside the transmission and cannot be removed or installed from outside (2009 Service Introduction, p97)."
    },
    {
      "id": "transaxle-new-002",
      "node": "pdkHeatExchanger",
      "label": "PDK Oil Cooler (Oil/Water Heat Exchanger)",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Fitted on the outside of the transmission near the bell housing. Cools the clutch/hydraulic oil, which heats up significantly more than the gear-wheel oil due to clutch friction; the gear-wheel oil is cooled sufficiently by the housing itself (Figs 3_85_09 / 3_86_09)."
    },
    {
      "id": "trans-cool-001",
      "node": "pdkCoolHose1",
      "label": "PDK Cooler Water Hose (Supply)",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "transaxle-new-002",
      "partNumber": null,
      "function": "Cooler supply line from the engine cooling circuit to the PDK oil/water heat exchanger (Fig 3_86_09 item 2)."
    },
    {
      "id": "trans-cool-002",
      "node": "pdkCoolHose2",
      "label": "PDK Cooler Water Hose (Return)",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "transaxle-new-002",
      "partNumber": null,
      "function": "Cooler return line from the PDK heat exchanger back to the engine coolant circuit (Fig 3_86_09 item 3)."
    },
    {
      "id": "trans-cool-003",
      "node": "pdkCoolHose3",
      "label": "PDK Cooler Oil Hose",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "transaxle-new-002",
      "partNumber": null,
      "function": "Hydraulic-oil connection linking the clutch-oil circuit to the heat exchanger inlet/outlet."
    },
    {
      "id": "trans-oil-001",
      "node": "pdkOilPressureLine",
      "label": "PDK Fluid Pressure Line",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hcu-003",
      "partNumber": null,
      "function": "High-pressure oil pipe from the pump outlet to the hydraulic control unit / valve body."
    },
    {
      "id": "trans-oil-002",
      "node": "pdkOilReturnLine",
      "label": "PDK Fluid Return Line",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hcu-003",
      "partNumber": null,
      "function": "Return line that routes low-pressure fluid from the valve body back to the PDK sump."
    },
    {
      "id": "trans-oil-003",
      "node": "pdkVacuumHose",
      "label": "PDK Vent / Breather Hose",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-003",
      "partNumber": null,
      "function": "Breather hose that vents internal transmission pressure to prevent seal blow-out and oil leakage."
    },
    {
      "id": "trans-oil-004",
      "node": "pdkMoldedHose",
      "label": "PDK Moulded Coolant Hose",
      "assembly": "Hydraulic Control",
      "system": "Transmission",
      "tier": "sub",
      "parent": "transaxle-new-002",
      "partNumber": null,
      "function": "Pre-formed rubber hose connecting the coolant circuit to the PDK heat exchanger with a specific routed shape to avoid hot surfaces."
    },
    {
      "id": "final-drive",
      "node": "finalDrive",
      "label": "Final Drive / Differential Assembly",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Hypoid final drive with differential splitting torque to the two rear driveshafts. 987.2 PDK data: rear-axle drive 11/34 (3.091) with spur-gear drive stage 1.146 (Boxster/Cayman) or 1.114 (S). An asymmetric limited-slip differential (22% traction / 27% overrun) was optional with 18/19-inch wheels."
    },
    {
      "id": "pdk-fd-001",
      "node": "pdkFinalDriveGearSet",
      "label": "Hypoid Final Drive / Ring and Pinion",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "final-drive",
      "partNumber": null,
      "function": "Hypoid ring-and-pinion set (11/34 = 3.091 on the 987.2 PDK) stepping down gearbox output speed. Cover, flange, ring gear, differential and pinion shaft shown in Fig 3_75_09."
    },
    {
      "id": "pdk-fd-002",
      "node": "pdkDifferential",
      "label": "Differential (Open, or Optional Mechanical LSD)",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "final-drive",
      "partNumber": null,
      "function": "Bevel-gear differential (ring gear, differential pinions, shaft bevel gears, planet-gear carrier — Fig 3_42_09). Optionally replaced by a plate-type limited-slip differential with 22% lock in traction and 27% in overrun."
    },
    {
      "id": "pdk-fd-003",
      "node": "pdkDriveFlanges",
      "label": "Drive Flanges / Output Flanges (x2)",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Splined flanges bolted to each side of the differential that accept the rear driveshaft CV joints."
    },
    {
      "id": "output-flange-l",
      "node": "outputFlangeL",
      "label": "Output Flange Left",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-fd-003",
      "partNumber": null,
      "function": "Left-side drive flange connecting the differential to the left rear half-shaft CV joint."
    },
    {
      "id": "output-flange-r",
      "node": "outputFlangeR",
      "label": "Output Flange Right",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-fd-003",
      "partNumber": null,
      "function": "Right-side drive flange connecting the differential to the right rear half-shaft CV joint."
    },
    {
      "id": "pdk-fd-004",
      "node": "pdkRearDriveshafts",
      "label": "Rear Driveshafts / Half-Shafts (x2)",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "CV axles transmitting final-drive torque to each rear wheel hub of the mid-engine 987."
    },
    {
      "id": "transaxle-new-003",
      "node": "pdkOutputShaftSeal",
      "label": "Output Shaft Oil Seal (Drive Flange Seal)",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "output-flange-l",
      "partNumber": null,
      "function": "Radial lip seal at each output flange preventing gear oil leakage where the driveshaft exits the differential housing. Replace at every driveshaft removal."
    },
    {
      "id": "trans-seal-001",
      "node": "pdkSeal1",
      "label": "PDK End Cover Seal Ring",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-002",
      "partNumber": null,
      "function": "Sealing ring at the rear end cover interface that prevents fluid seepage between the housing and end plate."
    },
    {
      "id": "trans-seal-002",
      "node": "pdkInputShaftSealExt",
      "label": "Input Shaft Oil Seal (External)",
      "assembly": "Gearbox",
      "system": "Transmission",
      "tier": "sub",
      "parent": "bell-housing",
      "partNumber": null,
      "function": "External shaft oil seal at the bell housing face that prevents PDK fluid migrating toward the engine crankshaft seal."
    },
    {
      "id": "transaxle-new-006",
      "node": "pdkInputShaftSeal",
      "label": "Input Shaft / Intermediate Shaft Seal Ring",
      "assembly": "Gearbox",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-cl-001",
      "partNumber": null,
      "function": "Internal sealing ring between the dual concentric input shafts preventing cross-leak between the two clutch oil circuits."
    },
    {
      "id": "transaxle-new-007",
      "node": "pdkOilSumpSeal",
      "label": "PDK Oil Pan Gasket / Seal",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-003",
      "partNumber": null,
      "function": "Sealing gasket between the lower oil pan and the main transmission case. Always replace when removing the sump."
    },
    {
      "id": "transaxle-new-008",
      "node": "pdkEndCapSeal",
      "label": "PDK End Cap O-Ring",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-002",
      "partNumber": null,
      "function": "O-ring sealing the rear end cap to the transmission case, preventing fluid loss at the gearbox tail."
    },
    {
      "id": "trans-fastener-001",
      "node": "pdkSumpBolt",
      "label": "PDK Sump Torx Bolt (x8)",
      "assembly": "PDK Housing",
      "system": "Transmission",
      "tier": "sub",
      "parent": "pdk-hsg-003",
      "partNumber": null,
      "function": "Torx-head bolt securing the PDK oil pan to the transmission case. Single-use — replace on every sump removal."
    },
    {
      "id": "drain-plug",
      "node": "drainPlug",
      "label": "Fluid Drain Plug",
      "assembly": "Service",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Bottom plug removed to drain PDK hydraulic oil. Fit a new sealing washer at every service; the gear-oil chamber has its own drain/overflow on the opposite side."
    },
    {
      "id": "trans-drain-seal",
      "node": "drainPlugSeal",
      "label": "Drain Plug Sealing Washer",
      "assembly": "Service",
      "system": "Transmission",
      "tier": "sub",
      "parent": "drain-plug",
      "partNumber": null,
      "function": "Crush-type sealing washer under the PDK drain plug. Single-use — must be replaced every time the drain plug is removed."
    },
    {
      "id": "fill-plug",
      "node": "fillPlug",
      "label": "Oil Overflow / Level Bore",
      "assembly": "Service",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Screw plug on the oil overflow bore used to set the hydraulic-oil level: engine idling, vehicle level, selector in P, clutch-cooling flow off via PIWIS Oil fill mode, top up until only drops emerge — completed within 5 minutes. A second overflow bore on the opposite side sets the gear-wheel oil level."
    },
    {
      "id": "trans-fluid-001",
      "node": "pdkFluid",
      "label": "PDK Oils (Two Chambers: FFL 3 + 75W-90)",
      "assembly": "Service",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Two separate fills (2009 Service Introduction, p66): 5.2 l Pentosin FFL 3 hydraulic oil for clutches/actuators (change every 90,000 km / 56,000 mi) and 2.95 l Mobilube PTX Formula A SAE 75W-90 GL4.5 for the gear wheel set (change every 180,000 km / 112,000 mi). Never substitute standard ATF — wrong fluid destroys the wet clutches."
    },
    {
      "id": "selector-housing",
      "node": "selectorHousing",
      "label": "Selector / Shift-Actuator Housing",
      "assembly": "Controls",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Houses the gear-selection mechanism above the shift rods. The shift rods are actuated hydraulically; there is no mechanical shift linkage from the cabin apart from the parking-lock engagement."
    },
    {
      "id": "mechatronic",
      "node": "mechatronic",
      "label": "Hydraulic Control Module (Valve Body Assembly)",
      "assembly": "Controls",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Combined hydraulic/electric module built from port plate, intermediate plate and valve housing (M6 through-bolts, retaining brackets — Figs 3_45_09 / 3_46_09). Actuates clutches and gear shifts, provides limp-home hold functions and controls the parking lock hydraulically."
    },
    {
      "id": "transaxle-new-004",
      "node": "pdkSelectorShaft",
      "label": "Selector Shaft (Parking-Lock Engagement)",
      "assembly": "Controls",
      "system": "Transmission",
      "tier": "sub",
      "parent": "mechatronic",
      "partNumber": null,
      "function": "Selector shaft with detent disc and connecting rod that engages the parking-lock catch purely mechanically when P is selected (Fig 3_78_09)."
    },
    {
      "id": "pdk-park-001",
      "node": "pdkParkingLock",
      "label": "Parking Lock (Catch & Parking-Lock Gear)",
      "assembly": "Controls",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Because the depressurised PDK clutches are open and cannot hold the car, a parking lock blocks the final drive: a catch engages the toothing of the parking-lock gear on the pinion shaft when P is selected (engaged mechanically via the selector lever, released hydraulically — 2009 Service Introduction, p88/93)."
    },
    {
      "id": "pdk-ctrl-001",
      "node": "pdkTcu",
      "label": "Transmission Control Unit (PDK)",
      "assembly": "PDK Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Located in the rear right of the luggage compartment beneath the cover (2009 Service Introduction, p102). Connected via CAN bus; processes selector position, SPORT/SPORT PLUS, pedal, brake, wheel speeds, acceleration, altitude and temperature inputs to run the shift programs and driver-type detection."
    },
    {
      "id": "pdk-ctrl-002",
      "node": "pdkGearSelectorUnit",
      "label": "PDK Gear Selector Lever (Cabin)",
      "assembly": "PDK Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Centre-console selector (P/R/N/D/M) that reports the driver's request to the transmission control unit; P also engages the parking lock mechanically. Shift strategy is sharpened by the optional SPORT / SPORT PLUS buttons (Sport Chrono)."
    },
    {
      "id": "pdk-ctrl-003",
      "node": "pdkShiftPaddles",
      "label": "Steering-Wheel Gearshift Switches",
      "assembly": "PDK Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Steering-wheel rocker switches (sliding gearshift switches on the standard 987.2 PDK wheel) that send manual upshift and downshift requests to the transmission control unit."
    },
    {
      "id": "pdk-ctrl-004",
      "node": "pdkSpeedSensors",
      "label": "RPM Sensors (x2, Internal)",
      "assembly": "PDK Control",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Two rpm sensors combined in one housing inside the transmission, wired out via the 16-pin connector together with the four distance sensors (2009 Service Introduction, p97). All PDK sensors are internal and cannot be replaced from outside."
    },
    {
      "id": "rear-mount",
      "node": "rearMount",
      "label": "Transaxle Rear Mount (Hydro-Mount)",
      "assembly": "Mounting",
      "system": "Transmission",
      "tier": "primary",
      "partNumber": null,
      "function": "Rear rubber hydro-mount supporting the gearbox tail and isolating driveline vibration from the chassis."
    },
    {
      "id": "transaxle-new-005",
      "node": "pdkTransaxleMountConsole",
      "label": "Transaxle Mount Console / Bracket",
      "assembly": "Mounting",
      "system": "Transmission",
      "tier": "sub",
      "parent": "rear-mount",
      "partNumber": null,
      "function": "Structural console bolting the hydro-mount to the chassis subframe, carrying transaxle vertical and lateral loads."
    },
    {
      "id": "transaxle-new-009",
      "node": "pdkSnapRing",
      "label": "Drive Flange Snap Ring / Retaining Circlip",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "output-flange-l",
      "partNumber": null,
      "function": "Circlip retaining the output drive flange axially within the differential bearing carrier."
    },
    {
      "id": "transaxle-new-010",
      "node": "pdkBearingBush",
      "label": "Differential Bearing Bush",
      "assembly": "Final Drive",
      "system": "Transmission",
      "tier": "sub",
      "parent": "final-drive",
      "partNumber": null,
      "function": "Bearing bush in the differential carrier supporting the drive flange and absorbing radial loads from the half-shaft."
    }
  ]
}