Schego Optimal/ws2 Reed Arm W/- Magnet

Description

Schego Optimal/ws2 Reed Arm W/- Magnet — Replacement vibrating arm with magnet for Schego Optimal and WS2 air pumps

The coil gets the credit for driving a membrane pump, but the part that actually moves is the arm. Schego Optimal/ws2 Reed Arm W/- Magnet (SKU: SH855) is the replacement reed arm with its magnet for the Schego Optimal and WS2 air pumps. In a vibrating-armature pump the coil’s alternating field makes the magnetised arm swing back and forth, and the arm is linked to the diaphragm, so every stroke of the membrane begins here. The magnet comes fitted to the arm, and Schego’s instructions for the related Prima pump call the equivalent part the metal rocker armature.

The Optimal 250 is listed at 250 L/h with no head, 210 L/h at 0.5 m, 5 W and 39 dBA, with a screw regulator; the WS2 is listed at 250 L/h and 5 W with a pressure of at least 2 m of water column, for decorative columns and protein skimmers. Both sit in a case of about 130 × 70 × 50 mm. A damaged or bent arm gives a pump that buzzes, rattles or runs with little output while the coil and diaphragm look fine. Schego’s strip-down procedure for the Prima, a related pump, says the gap between magnet and coil should be about 1 mm after reassembly; the same care with the gap applies to any rebuild of these pumps, but the exact figure for the Optimal and WS2 is not published. The supplier lists no dimensions or material for the arm.

Usage & Application

When to Use

• Rattling or buzzing: The arm may have loosened, bent or lost its magnet.
• Weak stroke: Coil powered, diaphragm sound, yet little air delivered.
• After a drop or knock: An impact can distort the arm without cracking the case.
• Complete rebuilds: Fitted alongside a new head kit and coil in a full overhaul.

Installation & Replacement Guide

• Unplug: Disconnect the mains plug and airline before the case is opened.
• Expose the arm: Remove the housing cover and head to see the arm and diaphragm linkage.
• Exchange the arm: Loosen the arm’s fixing, lift it off and fit the new arm in the same orientation.
• Mind the gap: Keep the magnet close to the coil but not touching, then run the pump to check.

Product Specifications & Highlights

Key Features

• Arm and magnet together: Supplied as the assembly the pump uses.
• Two models: Listed for both the Optimal and WS2.
• Link to the diaphragm: Transfers the coil’s vibration into pumping action.
• Cures rattles: Replaces a bent or worn arm that makes a pump noisy.
• Restores stroke: A correctly fitted arm returns the pump to its listed output.

Product Details

• Brand: Schego (Schemel & Goetz, Germany)
• SKU: SH855
• Barcode (GTIN/EAN): 4005256008554
• Product Type: Spare Parts > Air Pump Reed Arm
• Fits: Schego Optimal and WS2 air pumps
• Includes: Reed arm with magnet
• Pump Case: About 130 × 70 × 50 mm
• Companion Parts: Air chamber and diaphragm kit (SH852); coil (SH853); air filter felt (SH854)
• Target Environment: Freshwater and marine aquariums and skimmers driven by Schego Optimal or WS2 pumps