Armstrong Pump Seal Kits
Armstrong Fluid Technology offers pump seal kits and other repair parts to support the installation and maintenance of their products. Pump seal kits are available individually or sometimes as a component of a complete repair kit.
Mechanical seal kits consist of a rotating seal head, spring and holder, and stationary seal seat with O-ring or l-cup. The pump casing gasket and other minor hardware components possibly required to reassemble the pump are not included. O-ring and l-cup style seats are interchangeable between centerline discharge pumps but not between centerline and legacy tangential discharge pumps.
Armstrong Series 4030 & 4280 Seal Kits
Armstrong Series 4030 and Series 4280 seal kits consist of a casing gasket, impeller capscrew, impeller washer, and mechanical seal.
Armstrong Series 4380, 4382 & 4392 Seal Kits
These seal kits include a casing gasket, impeller capscrew, impeller washer, and mechanical seal.
Armstrong Design Envelope Series 4380, 4372 & 4280 Seal Kits
These seal kits include a casing o-ring, mechanical seal kit, and v-clamp ring.
Armstrong Design Envelope, IVS & Conventional Vertical In-Line Pump Parts List
Armstrong Design Envelope, IVS & Conventional Horizontal End Suction Pump Parts List
Armstrong Horizontal Circulator Pump Parts Comparison Bulletin
Armstrong Pump Repair Kits
Complete parts kits from Armstrong reduce the work to source items. Parts kits include all parts and related items required to complete replacement work, so you’ll never have to leave a repair incomplete just because you didn’t have all the necessary pieces for the job.
Armstrong Design Envelope Pump Part Kits
Armstrong Circulator Part Kits
Armstrong Pump Seal Kit Installation
Armstrong Seal Kit Instructions
- Remove the impeller and mechanical seal from the pump or motor shaft. The mechanical seal spring and spring holder usually come free with the impeller. The mechanical seal rotating element must be pried loose with pry bars or screwdrivers. Once loosened, the seal may be pulled free of the shaft.
- Removing the impeller and seal from a motor shaft, retrieve the spacer between the impeller and shaft sleeve—store for later use.
- The o-ring or l-cup mounted mechanical seal seat must be pried loose from the recess in the adapter. To do this: Separate the adapter from the bearing housing or motor. A screwdriver may then be used to push the seal seat out of the adapter from the rear.
- Clean the shaft sleeve surface, removing the entire former seal elastomeric residue. Inspect for damage and replace if necessary. Inspect the water slinger and replace it if damaged.
- Silicon carbide is a suitable replacement for ceramic, ni-resist, or tungsten carbide and is the seal seat of choice. Ceramic and silicon carbide are more brittle than ni-resist or tungsten carbide and should be handled accordingly.
- Install a new seal seat in the adapter cavity, being sure the lapped (polished) surface of the insert is facing up. Ensure that the cavity has been thoroughly cleaned. Lubricate the outside of the seat elastomer o-ring or l-cup with a small amount of temporary rubber lubricant emulsion and press straight and even down into the cavity. Do not press the seat with bare fingers; use a clean cloth or the cardboard disc typically supplied with the seal. Contamination of the polished and lapped seat face could cause immediate leakage.
- Replace the adapter, taking care that the seal seat is carefully guided over the shaft.
- Lubricate the inside of the seal rotating assembly (the ‘rubber’ bellows) with a small amount of temporary rubber lubricant emulsion and slide onto the shaft sleeve with a twisting motion, carbon face first, until pressed to the carbon face. Ensure the seal is securely in place by pushing firmly with two screwdrivers simultaneously on opposite tabs of the seal hardware. Push the rotating seal retainer and seal hardware tabs simultaneously to ensure the elastomer is not over-stretched.
- Remove the spring retainer from the seal spring and place the seal spring over the seal rotating assembly. Re-install the shaft sleeve spacer, if appropriate, and impeller key on the shaft, and set the seal spring retainer onto the impeller hub register. Slide the impeller into place on the shaft, taking care and ensuring the seal spring is kept in place on the seal rotating assembly and fits nicely into the retainer on the impeller hub. Secure impeller and finish reassembling pump.
Armstrong Design Envelope Vertical In-Line Pump Seal Change
Armstrong 4300 Vertical In-Line Pump (16x16x19) Seal Change
Armstrong 4300 Vertical In-Line Pump Seal Change
HVAC Know It All: On Site Pump Maintenance, Service, and Pump Curve Troubleshooting Podcast
Listen to the HVAC Know It All Podcast cover Armstrong pump maintenance, service, and pump curve troubleshooting with Joe Tibando from Armstrong Fluid Technology. They discuss the conditions necessary to ensure optimal performance of Armstrong pumps, including mechanical seals which are often the most common failing item on pumps.