Product: Shimadzu Option Parts RADIAL UNIT 1 ASSY 3304 for TMP-3304 series — a factory-original service assembly comprising the Radial Magnet Bearing 1, Radial Sensor 1, and Motor Stator. This repair assembly is designed to restore axial/radial stability, rotor sensing and electromagnetic drive integrity for TMP‑3304 class molecular turbomolecular pumps (also applicable across TMP‑2804 ~ TMP‑3304 family).
What this assembly contains
- Radial Magnet Bearing 1 — precision magnetic bearing element that provides radial stabilization of the rotor using permanent magnet and/or electromagnetic bias fields.
- Radial Sensor 1 — rotor position sensor (typically non-contact inductive/optical/Hall-type depending on OEM) used by the pump control electronics to maintain levitation and control radial stiffness.
- Motor Stator — OEM stator assembly matched to the rotor geometry and electronic drive requirements of the TMP‑3304 series.
Key benefits of the original assembly
- Guaranteed dimensional and electromagnetic compatibility with TMP‑3304 series rotor and control electronics.
- Optimized sensor calibration and signal fidelity for stable levitation and low vibration.
- Reduced installation and commissioning time relative to mixing third‑party components.
- Restores pump performance to design vacuum speed and reliability when replaced as an OEM unit.
Technical considerations
The radial unit governs rotor centering and provides the feedback loop required by the pump controller. Correct function depends on:
- Mechanical runout and concentricity tolerances between stator and rotor — the OEM stator and magnet bearing are machined and balanced to tight tolerances to avoid excessive radial runout and vibration.
- Sensor signal integrity — cables, connectors and the sensor head must be installed with proper shielding and grounding to avoid noise that can cause instability or false trip events.
- Thermal behavior — the stator and magnet assembly are specified for the TMP series thermal environment; replacement parts use matching materials to limit differential expansion.
Compatibility
This assembly is intended for TMP‑3304 series molecular pumps and is listed as an original parts repair solution for TMP‑2804 ~ TMP‑3304 family. Always confirm pump serial number and service documentation before ordering replacement assemblies.
Recommended installation best practices
- Perform replacement in a clean environment (ISO class as recommended by the manufacturer) to prevent contamination of magnetic bearing surfaces and sensor optics/surfaces.
- Inspect rotor and bearing housings for wear, scoring or contamination prior to assembly; clean with suitable solvent and lint‑free wipes.
- Use the manufacturer’s alignment fixtures and torque sequence; electrical connectors should be mated only after mechanical alignment checks are complete.
- Power up the pump using the proper controller and perform an initial sensor signal check and automatic levitation routine per service manual.
Preventive maintenance and inspection
- Regularly review controller diagnostic logs for changes in sensor offset or increased correction demands — early indicators of bearing wear or rotor imbalance.
- Carry spare signal cables and connectors to avoid downtime from intermittent sensor wiring faults.
- If the pump experiences hard starts, increased runout, or repeated trips, consider replacing the radial unit assembly as a matched set rather than mixing sensors and stators from different sources.
Ordering and service notes
Order the RADIAL UNIT 1 ASSY 3304 as the recommended service kit when replacing worn radial components on TMP‑3304 series pumps. Using original components preserves factory tolerances and reduces risk of incompatibility with controller firmware.
For original spare parts, service instructions and verification of fitment, please refer to the supplier resources or request OEM repair support via the official pages: Shimadzu Option Parts RADIAL UNIT 1 ASSY 3304, original replacement parts, spare parts catalog.
Final remarks
Replacing the Radial Magnet Bearing, Radial Sensor and Motor Stator as an OEM matched assembly is the most reliable path to restoring the dynamic stability and operational lifetime of TMP‑3304 series molecular pumps. For service planning, confirm pump model and serial number, and coordinate replacement with controller firmware and calibration procedures to ensure smooth recommissioning.
