ARMSTRONG 4280 Mechanical Seal Kits Instruction Manual

: June 4, 2024
: ARMSTRONG

Table of Contents

ARMSTRONG 4280 Mechanical Seal Kits
Seal kit installation instructions
Specification
References
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ARMSTRONG 4280 Mechanical Seal Kits

Refer to the appropriate service work instructions (swi) file for breakdown instructions for the pump being serviced. Mechanical seal replacement instructions are included in the pump swi. The following instructions are included for convenience.

caution
Always disconnect the power supply from the motor before beginning service work.

Seal kit installation 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.
When removing the impeller and seal from a motor shaft, take care to retrieve the spacer from 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, ensuring the entire former seal elastomeric residue has been removed. Inspect for damage and replace if necessary. (See separate instructions, File No. 6042.25, for removal of the motor shaft sleeve). Inspect the water slinger and replace if damaged.
Silicon carbide is a suitable replacement for ceramic, resist, or tungsten carbide and is the seal seat of choice. Ceramic and silicon carbides are more brittle than ni-resist or tungsten carbides 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 down, straight and even, into the cavity. Do not press the seat in 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. important: The spacer may come off when the old seal kit is removed. Be sure it is on when installing new seal kit.
caution
Do not use oil, Vaseline, or other petroleum or silicon-based products for seal elastomer lubrication. Otherwise, elastomer swelling may occur, causing seal failure. Recommended: International Products Corp p-80 Rubber Lubricant Emulsion in USA & UK www.ipcol.com.
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 2 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 place 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 well into the retainer on the impeller hub. Secure the impeller and finish reassembling the pump.

seal kit

part number

| s – 1 . 25″| 99750 01- 817| 975000 – 982| 99750 01- 813
---|---|---|---|---
m – 1 . 625″| 99750 01- 837| 975000 – 984| 99750 01- 833
l – 2 .125″| 99750 01- 877| 9750 0 0 – 985| 99750 01- 873
Fluid type| All glycols > 30% wt conc

abrasives (tds) >2000ppm

Specification

Used on: 4030/4280 4380/4382/4392 vil & 4360d
Seal Type : 2a
Pump Construction: bf/ab/ai
Stationary face: Sintered silicon carbide
Secondary Seal: EPDM
Spring: Stainless steel
Rotating Hardware: Stainless steel

Notes:

The seal kit consists of a rotating seal head, spring, 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. Consult service parts bulletins for more detail.
O-ring and l-cup style seats are interchangeable between centerline discharge pumps. Both styles are used as a standard for inside seals after October 2011.
O-ring and l-cup style seats are not interchangeable between centerline and legacy tangential discharge pumps.

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