Shimadzu Radial Unit 1 Assy 3304 for TMP 3304 Series Molecular Pump

Product overview:
This assembly is a direct original-equipment replacement unit designed for Shimadzu TMP-3304 series molecular pumps. The assembly (Radial Unit 1 Assy 3304) combines the Radial Magnet Bearing 1, Radial Sensor 1 and the Motor Stator into a single serviceable module to restore rotor stability, sensing accuracy and motor performance. It is intended for use in repairs and overhauls of TMP-2804 through TMP-3304 model families.

What is included:

• Radial Magnet Bearing 1 (pre-aligned to the stator assembly)
• Radial Sensor 1 (position sensing element for radial control)
• Motor Stator (original stator assembly matched to the above components)

Compatibility and application:
This Radial Unit 1 Assy 3304 is specified for the TMP-3304 series and is backward-compatible for repairs covering TMP-2804 through TMP-3304 units. Use this assembly when radial bearing faults, sensor failures or stator damage are diagnosed during pump service or refurbishment.

Key benefits:

• Original OEM parts ensure fit, function and long-term reliability.
• Combined assembly reduces repair time — bearing, sensor and stator are matched at the factory.
• Restores rotor centering and motor electromagnetic performance to factory specifications.
• Minimizes diagnostic complexity: replacing a single matched unit eliminates component mismatch risk.

Typical symptoms indicating replacement:

• Increased radial runout, unstable rotor behavior or mechanical rubs.
• Fault codes or alarms related to radial sensor signal loss or out-of-range position readings.
• Unusual motor noise, reduced speed stability or failure to reach rated rotation.

Installation notes & service precautions:
Installation should be performed by qualified service personnel familiar with high-speed turbomolecular pump assemblies. General steps:

1. Power down and isolate the pump from the system and remove vacuum connections per the service manual.
2. Disassemble the pump rotor and housing following Shimadzu procedures; handle magnets and sensors with care to avoid damage.
3. Install the Radial Unit 1 Assy 3304 as a complete module — do not attempt to mix with non‑matched third‑party components.
4. Recalibrate sensor offsets and verify rotor balance and centering per factory instructions.
5. Run the pump through controlled spin-up tests and monitor sensor signals, vibration and temperature before returning to service.

Handling and storage:
Store the assembly in a clean, dry environment free from strong magnetic fields. Protect magnetic surfaces and sensor faces from impacts and contamination. Use electrostatic discharge (ESD) precautions when handling electronic sensor connectors.

Inspection & testing after replacement:

• Confirm sensor output levels and verify radial control loops are stable.
• Monitor bearing temperatures and vibration spectrum during initial run-in.
• Perform leak checks and confirm ultimate vacuum meets TMP-3304 specification.

Packing & shipping:
Parts are shipped in anti-static, shock-absorbing packaging with cushioning to protect magnets and sensor elements. For international shipments, proper declaration and documentation for vacuum pump component shipments will be provided.

Ordering & support:
For genuine replacements and service advice, please inquire through our parts channel. We supply OEM-grade assemblies suitable for service centers and end-users repairing TMP-2804~3304 pumps. For additional product information, technical drawings or lead time, contact the supplier or visit the product page: Shimadzu Option Parts RADIAL UNIT 1 ASSY 3304. You can also find more spare parts and service resources at TMP-3304 series repair parts or check original replacement listings at original replacement parts for TMP-2804~3304. For assembly compatibility and bearing/sensor matching details see our dedicated section: Radial Magnet Bearing and Sensor assemblies.

Note: This description is intended to assist technicians and purchasing professionals evaluating replacement components for Shimadzu turbomolecular pumps. Always refer to the pump's service manual and OEM instructions for disassembly, torque values, calibration procedures and safety information.