Shimadzu Option Parts Axial MB(1) Assembly for TMP-803 1503 Series Molecular Pumps

The following describes the Shimadzu Axial Magnet Bearing (Axial MB(1) Assy) — an original-option repair part designed for TMP-803 and TMP-1503 series molecular pumps. This OEM axial magnetic bearing assembly restores axial magnetic suspension performance and axial positioning control in Turbo Molecular Pumps (TMP) where axial support and precise rotor centering are critical for high-speed, low-vibration operation.

Product overview

This Axial MB(1) Assy is an original Shimadzu option part intended for repair and refurbishment of TMP‑803 and TMP‑1503 series molecular pumps. It replaces the axial magnetic element and related subassembly that provides axial magnetic centering and damping for the rotor. Using an original assembly helps maintain factory-balanced rotor behavior, minimize vibration, and preserve ultimate vacuum performance.

Key features

• OEM original repair assembly manufactured to Shimadzu specifications.
• Precision magnet assembly for stable axial suspension and repeatable axial float characteristics.
• Designed to integrate with the rotor/stator geometry of TMP‑803 and TMP‑1503 family pumps.
• Durable construction with corrosion-resistant components for long service life in high-vacuum environments.
• Delivers consistent rotor centering to protect mechanical bearings and extend overall pump life.

Compatibility

Direct fit for TMP‑803 and TMP‑1503 series molecular pumps. Before ordering, confirm your pump model and serial number against the service manual or request verification from a qualified technician.

For details on related option and non-standard spare parts, see Shimadzu molecular pump non-standard maintenance parts and related option references.

Materials and construction

The assembly typically incorporates high-performance permanent magnet elements and non-magnetic housings or sleeves to ensure a stable axial magnetic field while resisting contamination. Bearing surfaces and fasteners are treated or selected to meet vacuum cleanliness requirements. The assembly is supplied as a ready-to-install unit to preserve factory balance and axial calibration.

When to replace

• Following evidence of axial instability, increased vibration, or audible changes at high speed.
• After an incident that may have impacted axial components (e.g., rotor contact, shock, or contamination event).
• During scheduled overhaul if OEM service schedule recommends replacement to maintain vacuum performance.

Installation and handling notes

• Installation should be performed by factory-trained technicians or according to the pump service manual.
• Maintain a clean environment (clean bench or equivalent) to prevent contamination of magnetic and bearing surfaces.
• Handle magnets and assemblies carefully to avoid sudden impacts; use appropriate tools to control magnetic attraction during assembly.
• Follow the pump’s rebalancing and rotor run-in procedures after replacement to verify vibration and speed stability.
• Consult the service manual for any alignment or preload instructions; when in doubt, contact authorized service.

Maintenance and troubleshooting

Routine checks: monitor vibration, axial displacement sensors (if present), and bearing temperature. If the pump exhibits increased vibration, erratic axial float, or cannot reach rated speeds, inspect the axial magnetic assembly and related electronic controls.

Troubleshooting steps typically include inspection for contamination or scoring, verification of magnet seating and connectors, and review of rotor dynamic balance. For replacement parts and authorized support, consider sourcing OEM option parts such as the Axial MB(1) Assy listed here: Shimadzu Option Parts.

Quality assurance and warranty

OEM assemblies are supplied with quality control documentation and are inspected to meet factory tolerances. Warranty terms vary by supplier — verify warranty coverage and return policy at the time of purchase. Use genuine assemblies to avoid mismatched balance or magnetic characteristics that can degrade pump performance.

Ordering, packaging and shipping

When ordering, specify pump model (TMP‑803 or TMP‑1503), pump serial number, and any service history relevant to the axial assembly. Parts are shipped in anti-magnetic/anti-contamination packaging to protect magnets and precision surfaces during transit. For ordering and additional non-standard maintenance parts, visit our parts page: Axial MB(1) Assy spare parts.

Safety precautions

• Keep magnetic assemblies away from ferromagnetic tools and electronic devices that could be affected by strong magnetic fields.
• Do not attempt field modifications — unauthorized changes can compromise balance and vacuum integrity.
• Dispose of any damaged magnets or assemblies according to local regulations for electronic and magnetic material disposal.

Additional resources

For full compatibility checks, original part numbers, and availability of related Shimadzu non-standard maintenance parts, consult the supplier parts list and service documentation or visit: Shimadzu molecular pump non-standard maintenance parts.