We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

MCDONNELL & MILLER Head Mechanism: 51-HD Mfr Part # - Replacement HVACR Pumps, Valves & Tubing
MCDONNELLReplacement HVACR Pumps, Valves & Tubing

MCDONNELL & MILLER Head Mechanism: 51-HD Mfr Part #

The MCDONNELL & MILLER 51-HD Head Mechanism is a replacement component for HVACR pumps, valves, and tubing. This part, with manufacturer part number 51-HD, is compatible with manufacturer part number 134900.

SKU 3G-OTH-76558

Also listed as: 51HD · 51 HD

Brand
MCDONNELL
Item
& MILLER Head Mechanism: 51-HD Mfr Part #
Category
Replacement HVACR Pumps, Valves & Tubing
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

MCDONNELL
Manufacturer Part Number
51-HD
Product Type
Head Mechanism
Compatible Manufacturer Part Number
134900

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

MCDONNELL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MCDONNELL & MILLER 51-HD Head Mechanism is a replacement component for HVACR pumps, valves, and tubing. This part, with manufacturer part number 51-HD, is compatible with manufacturer part number 134900.

Frequently Asked Questions

What is the MCDONNELL & MILLER 51-HD Head Mechanism used for?

The MCDONNELL & MILLER 51-HD Head Mechanism is a replacement component for HVACR pumps, valves, and tubing. It is used to restore or maintain the proper function of fluid-handling systems in commercial and industrial heating, ventilation, air conditioning, and refrigeration applications.

What are the specifications of the MCDONNELL & MILLER 51-HD Head Mechanism?

The MCDONNELL & MILLER 51-HD Head Mechanism has manufacturer part number 51-HD and is compatible with manufacturer part number 134900. It is classified as a replacement head mechanism for HVACR pumps, valves, and tubing systems.

Where to buy the MCDONNELL & MILLER 51-HD Head Mechanism worldwide?

You can source the MCDONNELL & MILLER 51-HD Head Mechanism through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring the part reaches your facility reliably.

How to install the MCDONNELL & MILLER 51-HD Head Mechanism?

Installation of the MCDONNELL & MILLER 51-HD Head Mechanism should follow the manufacturer's guidelines for the specific pump or valve system. General best practice includes isolating the system, relieving pressure, and ensuring proper alignment of the mechanism before securing it in place.

Used in

Common applications for MCDONNELL
Steam boiler low-water cutoff — McDonnell & Miller 61 level control
Condensate receiver level monitoring — McDonnell & Miller RS-4-BR-1 4-level sensor
HVACR pump suction filtration — McDonnell & Miller 340700 strainer basket assembly
Flow switch head replacement — McDonnell & Miller 63-HD head mechanism
Boiler control circuit safety — McDonnell & Miller 7-BM electrical switch with manual reset
Field servicing of flow switches — McDonnell & Miller 310452 cartridge kit

MCDONNELL Products

3G Electric supplies MCDONNELL replacement hvacr pumps, valves & tubing. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Pump Accessories Valves & Regulation Motors & Drives All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
MCDONNELL
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 51-2-HD Mfr Part #
MCDONNELL & MILLER Head Mechanism: 94-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 94-HD Mfr Part #
MCDONNELL & MILLER Head Mechanism: 94-HDLS Mfr Part #
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 94-HDLS Mfr Part #
MCDONNELL & MILLER Head Mechanism: 94-7B-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 94-7B-HD Mfr Part #
MCDONNELL & MILLER Head Mechanism: 63-M-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 63-M-HD Mfr Part #
MCDONNELL & MILLER Head Mechanism: 64-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Head Mechanism: 64-HD Mfr Part #

More from MCDONNELL

View all MCDONNELL parts
MCDONNELL & MILLER Level Control: 63-M Mfr Part #
MCDONNELL
MCDONNELL & MILLER Level Control: 63-M Mfr Part #
MCDONNELL & MILLER Water Feeder: 51-S-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-S-HD Mfr Part #
MCDONNELL & MILLER Level Control Float Block: 64-B Mfr Part #
MCDONNELL
MCDONNELL & MILLER Level Control Float Block: 64-B Mfr Part #
MCDONNELL & MILLER Level Control Tapping: 63-B Mfr Part #
MCDONNELL
MCDONNELL & MILLER Level Control Tapping: 63-B Mfr Part #
MCDONNELL & MILLER Level Control: 157S-RBP-MD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Level Control: 157S-RBP-MD Mfr Part #
MCDONNELL & MILLER Cartridge: 310453 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Cartridge: 310453 Mfr Part #
MCDONNELL & MILLER Low Water Cut-Off, Pump Controller: 193 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Low Water Cut-Off, Pump Controller: 193 Mfr Part #
MCDONNELL & MILLER Casting: 193-1 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Casting: 193-1 Mfr Part #