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Bell & Gossett 118844 (P2Z-12291) Cast-Iron Spring Coupler & 189134LF Bearing Assembly Spec for Series 100 Circulator Engineering Diagram
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SPECFOUNDRY SKU: SF-HVC-105 · BRAND REF: Bell & Gossett / Xylem

Bell & Gossett 118844 (P2Z-12291) Cast-Iron Spring Coupler & 189134LF Bearing Assembly Spec for Series 100 Circulator

Stamped Casting / OEM Numbers: 118844 189134LF 118705 P2Z-12291 189034 BG-118844

Compatible Units: Bell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)

Critical Dimensions & Spec: 1/2" x 1/2" bore cast-iron spring coupling with eyelet springs; direct match for 189134LF bearing assembly & 118705 flange gaskets

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Pre-Order Dimensional Verification Checklist

OEM Cross-Reference & Stamped Casting Number Table

Use this cross-reference table to confirm that the number stamped or printed on your original hardware or circuit board corresponds to SpecFoundry SKU SF-HVC-105:

Stamped / OEM Part Number Manufacturer / System Brand Compatible Models & Years SpecFoundry Replacement SKU
118844Bell & Gossett / XylemBell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)Direct Match (SF-HVC-105)
189134LFBell & Gossett / XylemBell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)Direct Match (SF-HVC-105)
118705Bell & Gossett / XylemBell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)Direct Match (SF-HVC-105)
P2Z-12291Bell & Gossett / XylemBell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)Direct Match (SF-HVC-105)
189034Bell & Gossett / XylemBell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)Direct Match (SF-HVC-105)
BG-118844Bell & Gossett / XylemBell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189)Direct Match (SF-HVC-105)

Common Failure Symptoms Solved by SF-HVC-105

Technicians and property owners typically replace 118844 when experiencing one or more of the following failure modes:

  • Loud metallic rattling or clanging noise from boiler room when circulator starts
  • Boiler motor spins freely at 1725 RPM while pump impeller shaft stands still
  • Broken spring eyelet on B&G Series 100 coupler caused by sagging motor mounts

Step-by-Step Dimensional Verification & Installation Notes

Inspect rubber motor mount rings on the 1/12 HP motor first (a sagging motor snaps new couplers quickly). Loosen the two 5/16" hex set screws on shaft flats, align coupler springs tension-free, and oil front/rear cups with SAE 20 non-detergent oil.

Related Technical Guide: Taco 571-2 vs. Honeywell V8043E Zone Valve Powerheads, B&G Couplers & Boiler Cross-Reference →

Frequently Asked Technical Questions (118844)

Where is the casting or OEM part number (118844 / 189134LF / 118705) stamped on this part?

On Bell & Gossett / Xylem assemblies, look for the stamped or die-cast numbers (118844, 189134LF, 118705, P2Z-12291, 189034, BG-118844) on the underside of the metal housing, along the link arm, on the stainless hinge track, or printed on the circuit board/valve label. Note that casting numbers identify the housing casting, so always confirm critical dimensions (1/2" x 1/2" bore cast-iron spring coupling with eyelet springs; direct match for 189134LF bearing assembly & 118705 flange gaskets) as well.

Does SpecFoundry SKU SF-HVC-105 directly replace OEM part 118844 (118844, 189134LF, 118705, P2Z-12291, 189034, BG-118844)?

Yes. SF-HVC-105 is verified to match the mounting footprint, electrical/mechanical ratings, and dimensional envelope of Bell & Gossett / Xylem 118844, 189134LF, 118705, P2Z-12291, 189034, BG-118844 used on Bell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189).

What measurements should I verify before ordering SF-HVC-105?

Before ordering, verify: (1) Stamped or OEM code matches one of 118844, 189134LF, 118705, P2Z-12291, 189034, BG-118844; (2) Dimensional spec matches: 1/2" x 1/2" bore cast-iron spring coupling with eyelet springs; direct match for 189134LF bearing assembly & 118705 flange gaskets; and (3) Application matches: Bell & Gossett Series 100 NFI / AB / BNFI 1/12 HP Oil-Lubricated Hydronic Boiler Circulator Pumps (106189).

How fast does SF-HVC-105 ship and what payment methods are accepted?

SF-HVC-105 ships within 1–2 business days from our US warehouse network. Flat-rate US Ground shipping is $8.95, or FREE on orders of $150+. You can check out online immediately via PayPal, Venmo, Credit/Debit Card, or request an Instant Card Payment Link / Net-30 Commercial PO Invoice.

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