What the 615-28660-2 Is
The 615-28660-2 is a squirt nozzle for Lincoln PMA and PMA 2 solenoid pump chain lubrication systems, applying metered oil pulses to chain pins and rollers without compressed air or oil mist. Lincoln is a trademark of its respective owner. This is an aftermarket nozzle, not manufactured, sponsored, or endorsed by Lincoln. 615-28660-2 designations are for cross-reference identification only.
Specifications
| Part number | 615-28660-2 |
| Type | Oil squirt nozzle for chain lubrication |
| System | Lincoln PMA and PMA 2 solenoid pump circuits |
| Connection | Push-in, 6 mm tubing |
| Family opening pressure | Single nozzle about 7.5 bar; double nozzles 5-8 bar |
| Typical chain distance | 20-50 mm at 800 cSt |
Nozzle or Pump: Who Meters the Oil
The 30 or 60 mm3 per stroke figure is a PMA 2 pump delivery setting, not a nozzle output rating. The nozzle remains closed until line pressure reaches its opening pressure, then it opens and directs the oil pulse to the chain pins and rollers.
In practice, one pump stroke delivers its set volume into the line branch feeding the open nozzles. The dose at each lubrication point depends on how many nozzles the pump serves plus line length and oil viscosity effects, so the actual oil per point can be less than the pump setting divided evenly across nozzles.
Setting Up Chain Lubrication
Typical nozzle-to-chain distance is 20-50 mm at an operating viscosity around 800 cSt. One PMA 2 pump can feed 1 to 6 nozzles, so branch the 6 mm tubing to each nozzle and keep runs as balanced as practical.
Double nozzles in this family are intended for top-to-bottom application unless horizontal use is reviewed. Use push-in fittings for 6 mm tubing at each nozzle connection, and confirm line pressure reaches the nozzle opening pressure before relying on oil delivery.
The Nozzle Family and the -2 Suffix
The documented single oil-jet nozzle is SZDY-03, part 615-28660-3, with an opening pressure of about 7.5 bar. Documented double nozzles are 615-29209-1 in straight configuration and 615-29301-1 in 90 degree configuration, both with 5-8 bar opening pressure.
The relationship between the -2 and -3 suffix numbers is not publicly documented. Confirm interchangeability with your pump circuit and chain geometry before substituting one suffix for the other.
Related Parts
This nozzle works with the PMA 2 magnetic pump, which supplies the metered oil pulses to the lubrication circuit. If you are evaluating other oil lubrication pumps, match the delivery setting and branch count to the nozzle arrangement. For background on how these parts fit a broader system, see centralized lubrication. Request pricing through the quotation form when you are ready to confirm configuration.
Frequently Asked Questions
What does the 615-28660-2 nozzle do?
It applies metered oil pulses to chain pins and rollers in Lincoln PMA and PMA 2 systems. The nozzle opens on pressure rise and directs oil to the target point.
Is 60 mm3 the nozzle output?
No, the 30 or 60 mm3 per stroke is a PMA 2 pump delivery setting. The nozzle itself does not meter that volume independently.
What tubing size fits this nozzle?
The connection is a push-in fit for 6 mm tubing. Match the tubing outside diameter to the push-in fitting spec.
What does opening pressure mean here?
Opening pressure is the line pressure at which the nozzle begins to open. For the single nozzle family member it is about 7.5 bar.
Is the -2 nozzle interchangeable with the -3 nozzle?
The relationship between the -2 and -3 suffix numbers is not publicly documented. Confirm interchangeability with your pump circuit before substituting one for the other.
What distance should the nozzle sit from the chain?
Typical nozzle-to-chain distance is 20-50 mm at about 800 cSt operating viscosity. Verify placement so the oil pulse lands on the pins and rollers.
How many nozzles can one pump feed?
One PMA 2 pump can feed 1 to 6 nozzles. The oil per point drops as more nozzles share the pump delivery.
Should I choose a single or double nozzle?
Single nozzles place one oil jet on the chain from one side. Double nozzles are intended for top-to-bottom application unless horizontal use is reviewed.
Which pumps does this nozzle fit?
It fits Lincoln PMA and PMA 2 solenoid pump chain lubrication circuits. Confirm tubing and mounting compatibility before ordering replacement nozzles.
How do I order or get support?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
You can also request pricing through the quotation form. A support engineer will confirm nozzle configuration for your pump.
