The diaphragm pump in the AirCoat spray system is split across two diagrams on our site. The Pump Head diagrams hold the inlet valve, valve seat, outlet spring and diaphragm assembly. The Diaphragm Pump diagram holds the hydraulic housing, hydraulic piston, pressure valve needle and the motor-side parts. Open the right page first, then order by callout.
Which AirCoat has a diaphragm pump
The AirCoat 423 and 620 are air-powered, with an air motor and a fluid pump. The diaphragm pump belongs to the electric AirCoat system, the one Titan sells as the AirCoat AAA (0508074A complete, 0550039 bare). Dealer listings describe it as having an onboard air compressor and a sealed hydraulic pump, with a switch between air-assisted and airless modes. They give its ratings as 0.35 GPM and 2800 psi.
That matters when you order. A part for a 423 or 620 fluid pump will not appear on the diaphragm pump diagrams, and the reverse is also true. Confirm which machine you own first. If the data plate or manual does not settle it, call (713) 931-0006 with the model and serial number.
Two diagram pages, two jobs
Our diagrams divide this pump into the fluid end and the drive end.
- Pump head: where paint enters and leaves. Open AirCoat Air-Assisted Pump Head Assembly (16 parts). A shorter three-part page, Spray System Pump Head Assembly Parts, also exists.
- Diaphragm pump: the hydraulic and motor-side parts. Open AirCoat Spray System Diaphragm Pump Parts (26 parts).
The pump head: valves and diaphragm
Pump head parts on the diagram
The same page also lists an outlet valve spring (0270499), a seal for the outlet seat (0089494), a nylon sealing washer (0089482) and an inlet cap (0278655). Order from the diagram callouts rather than from memory, because several of these small parts look alike.
The drive end: hydraulic housing and motor side
Titan describes this pump as a sealed hydraulic unit, and the diagram reflects that. The page lists the Hydraulic Housing Assembly (0278237), Hydraulic Piston (0278339), Hydraulic Cover (0278341), Eccentric Sleeve And Bearing Assembly (0090031) and a Piston Spring (0005311). It also lists a Pressure Valve Needle (0089475), Stem Valve (0270529), Pressure Regulating Spring (0047373) and Pressure Control Knob (0288775).
The page also shows the Pump Head (0508193A) and a packaged AirCoat motor (0508612A). We do not have a manufacturer-sourced explanation of how these parts interact, so we will not guess. The Titan manual for your machine is the right place for that, and for any step that opens the sealed hydraulic section.
What to check before you order a pump part
- Strainer and filters: a partly blocked inlet filter makes any pump seem weak. The inlet filter on the suction set is 0295565 (16 mesh).
- Prime/spray valve: check it is set the way your manual describes before blaming the pump.
- Valves: worn valve seats, springs or seals on any sprayer pump cause pulsing, pressure loss or failure to prime. The pump head page is where those parts live.
- Leaks: note where paint or oil shows, then match the spot to a diagram page. A leak at the pump head and a leak at the hydraulic housing point to different parts lists.
Parts you can add now
Live prices and Add to Cart for the main pump head and hydraulic parts.
Inlet valve, diaphragm, valve seat and outlet parts.
Hydraulic housing, piston, needle and motor-side parts.
Inlet filter and suction hose.
Bottom line
Identify the machine, open the pump head or diaphragm pump diagram, and order by callout. Leave the sealed hydraulic section to the manual's procedures, and call (713) 931-0006 if the fitment is unclear.
Not sure which pump part you need?
Call (713) 931-0006 with your model and serial number, or order from the parts diagram.
(713) 931-0006Order by Parts Diagram