This listing describes the original Axial Magnet Bearing (MB(2) Assy 1003) — the OEM repair assembly for Shimadzu TMP-803 and 1503 series molecular (turbo) pumps. The MB(2) assembly is a precision axial electromagnetic bearing module designed to support and stabilize the rotor along its axial axis during high-speed operation, restoring factory performance and reliability after wear or damage.
Key part identity: Axial Magnet Bearing (MB(2) Assy 1003) — intended as a direct replacement/original repair part for Shimadzu TMP-803 and 1503 series molecular pumps. For the official product page and available non-standard repair parts see Shimadzu molecular pump non-standard maintenance parts.
Primary functions
- Provide axial magnetic support to maintain rotor axial position at high RPM.
- Minimize axial runout and prevent rotor-stator contact under vacuum and during transient events.
- Enable precise dynamic balance and improved vibration performance when combined with the pump’s control electronics.
Typical applications and compatibility
- Direct replacement for Shimadzu TMP-803 and 1503 series molecular pump units.
- Used in laboratory, semiconductor, and analytical mass-spectrometry vacuum systems where the specified Shimadzu turbomolecular pumps are installed.
- For related repair items and complementary option parts consult Shimadzu Option Parts Axial MB(2) Assy 1003.
Key features and benefits
- OEM-quality manufacturing to Shimadzu tolerances — ensures correct magnetic field geometry and axial centering.
- Precision-machined magnetic core and non-magnetic housing materials for stable thermal and mechanical behavior.
- Pre-assembled and bench-tested to confirm coil continuity and basic alignment prior to shipment.
- Plug-and-play mechanical fitment for straightforward replacement (electrical connectors and routing follow original pump harnessing).
- Improves pump life and reduces risk of catastrophic rotor contact when replacing worn or damaged axial bearing elements.
Inspection and pre-installation checks
- Visually inspect the assembly for transit damage, foreign material, or contamination.
- Check connector pins and harness for corrosion or bending; continuity testing of coils is recommended before fitting.
- Confirm part number and physical fit against the removed assembly from the pump.
High-level installation procedure (expert service recommended)
- Power down the pump and associated electronics; follow ESD and vacuum-service safety procedures.
- Evacuate and, if required, warm the pump per the manufacturer’s service manual to remove trapped gases and moisture.
- Carefully disassemble the rotor/stator housings to access the axial magnetic bearing — note and document rotor orientation and any shims or spacers.
- Remove the old axial bearing assembly, clean mating surfaces with approved solvents, and verify no magnetic debris remains.
- Install the new MB(2) Assy 1003 in correct orientation; torque fasteners to Shimadzu specified values (refer to official service manual for torque specs).
- Reconnect electrical harness and verify connector seating. Do not run the pump until clearance and balance checks are complete.
- Perform spin-up and monitoring: watch vibration, axial position signal (if available), and bearing currents. Run vacuum and leak checks before returning to production service.
Commissioning and testing
- Start with a controlled spin-up profile and monitor bearing currents and rotor axial displacement signals if the control electronics provide them.
- Verify that vibration levels are within acceptable limits for the pump model; excessive vibration can indicate misalignment or residual contamination.
- Run extended soak tests under vacuum to ensure thermal stability and long-term reliability of the assembly.
Storage and handling
- Store in a clean, dry environment at laboratory ambient conditions; avoid strong magnetic fields and moisture exposure.
- Handle by non-magnetic tools where possible and avoid dropping or striking the assembly to prevent magnet displacement or coil damage.
Ordering, part number & packaging
The recommended ordering reference is the Axial Magnet Bearing (MB(2) Assy 1003) for Shimadzu TMP-803 / 1503. Parts are shipped in anti-static, cushioned packaging with protective caps on exposed connectors. For ordering and related option parts visit Shimadzu molecular pump non-standard maintenance parts.
Warranty and support
When purchased as an OEM repair part, assemblies typically carry limited workmanship warranty terms as provided by the supplier. It is strongly recommended that installation and trial runs be performed by trained service personnel or an authorized repair facility to preserve warranty coverage.
Need assistance? If you require installation guidance, compatibility confirmation, or bulk-purchase information, contact your authorized Shimadzu service provider or the parts distributor referenced above for technical support and genuine replacement parts.
