The Impact 640 suction set draws paint from the pail to the pump. Its diagram page lists the suction set assembly 0558672A, the 700-805 inlet screen filter, the 0558659A return tube, two O-rings and two clips. Titan's Impact manual lists an air leak at the siphon tube or suction set, or a clogged inlet screen or suction set, as causes of a sprayer that will not prime.
What the suction set does
An airless pump can only spray the paint that reaches it. The suction set is the line between the pail and the pump: it picks up coating through an inlet screen, carries it up to the fluid section, and returns bypass paint to the pail through the return tube. If the screen is blocked, or air gets into the line, the pump runs but has nothing to move and the sprayer will not prime. It is a good first place to look for a prime problem.
The Suction Set Assembly page
The site's Impact 640 Suction Set Assembly page lists nine parts, using the diagram's own callout numbers:
Impact 640 Suction Set Assembly parts
That is eight part numbers for nine entries, because the page lists the 704-109 O-ring twice. If you only need the line itself, 0558672A is the whole suction set, and the smaller parts are there for when a single O-ring or clip is damaged and replacing the whole set would be more than you need.
Siphon and main assembly items
Some of the suction-side parts live on the Impact 640 Main Assembly page rather than the suction set page. That page lists:
- 805-408 Siphon Tube (callout 36)
- 710-046 Inlet Screen (callout 38)
- 702-239 Bypass Hose (callout 37)
- 193-200 Return Tube Fitting (callout 39)
- 710-033 Pail Bracket Bolt (callout 33)
So there are two inlet screen listings: 700-805 on the suction set page and 710-046 on the main assembly. They are not the same number. When you order a screen, tell us which page you are looking at, or give us your model and serial number so we can confirm which one your sprayer takes.
Prime problems that start here
Titan's Impact 640 manual lists the causes of a sprayer that will not prime, and its Impact 1040 manual agrees. Three of them are on the suction side:
PRIME/SPRAY valve in SPRAY
Turn it to PRIME. It is the first thing to check, and it costs nothing.
Air leak at the siphon tube or suction set
Titan's manual says to tighten the connection or re-tape it with PTFE tape. A worn or missing O-ring (9871105 or 704-109) or a loose clip is a place an air leak can start, so check those against the diagram.
Clogged inlet screen, siphon tube or suction set
The manual says to remove and clean them. A screen caked with dried paint is a common cause, and cleaning it takes minutes.
The manual also lists a stuck inlet valve and a clogged pump filter, which are on the pump side. For those, see the Fluid Section page. We keep this post to the suction parts, and do not repeat the full troubleshooting table; your manual has it. Manuals are on our manuals page.
Parts the 640 shares with its neighbours
The suction set assembly 0558672A and the 700-805 inlet screen filter are listed on the suction set pages for the 340, 400, 410, 440 and 540 as well as the 640. The Impact 440 page shows the same list as the 640 page, with the same part numbers. The diagram lists the same part number on those models, and that is the reason we say "listed on the 640 and 440 pages" rather than call them interchangeable. Impact X models have their own siphon tube assembly and list 700-805 too.
What to order
For a sprayer that will not prime and a suction line that looks sound, start small: the O-rings 9871105 and 704-109 and the 700-805 inlet screen filter are the parts on this page tied to the air leak and blocked inlet causes Titan's manual lists. Confirm the callouts on the page, and add the 0558672A suction set if the line itself is cracked or damaged. If you are not sure whether the line or the pump is at fault, call (713) 931-0006.
Suction side parts for the Impact 640, with live prices:
Suction side first
When an Impact 640 will not prime, check the PRIME/SPRAY valve, then the inlet screen and the siphon connection, before you suspect the pump. The suction parts are on two diagram pages: Suction Set Assembly and Main Assembly.
Not sure which suction part you need?
Call (713) 931-0006 with your model and serial number and our parts team will confirm the part before you order.
(713) 931-0006Order by Parts Diagram