Check the quick, low-cost parts first: the spray tip and tip seat, the filters and inlet screen, and the suction set O-rings. If the pump still will not prime or hold pressure, move to the inlet valve, the valve balls and cage, and finally the packings. The Impact 340 diagram pages list the part number for every one of these.
Know which sprayer you are checking
The Impact 340 is a 120 V electric piston-pump airless sprayer. Titan lists it at 0.47 gpm maximum delivery, a 0.021" maximum tip size, 3000 psi and a 0.75 hp motor. It sits with the 400 and 410 as the smallest Impact models, and it has its own six diagram pages on this site. Open those pages for the 340 rather than the 440 or the Impact X, because the larger and newer machines use different pump parts.
Titan lists Quad+ Packings and the PermaLife Cylinder on the 340. The cylinder is the one part Titan describes as non-wearing. Everything around it still wears: the tip, the filters, the valve balls and seats, the piston rod and the packings. That is what this checklist covers.
Match the symptom to the first check
Titan's Impact manuals group airless faults the same way, and the order below follows that logic with the quickest, lowest-cost check at the top.
Impact 340 symptoms and where to look first
| What you see | Check first | Then check |
|---|---|---|
| Coarse or streaky pattern, more paint used | Spray tip and tip seat | Filters, then pressure setting |
| Spitting, pressure drops over a job | Filters and inlet screen | Suction set O-rings and clip |
| Will not prime | Prime/spray valve position, then suction set air leak | Inlet valve and inlet pusher |
| Pressure will not build or hold | Tip wear, filters, air leaks | Valve balls, seats, then packings |
| Pulsing at the gun | Filters | Upper packings |
| Paint leaking at the top of the fluid section | Tighten external fittings | Packings, balls and seats |
| Will not run | Power supply and breaker | Power switch, then service center for motor or board |
Symptom logic follows the troubleshooting tables in Titan's Impact manuals. Your own model manual is the final word.
Step 1: the tip and the tip seat
A worn tip has a wider orifice, so pressure falls, the pattern turns coarse and you use more paint. It is among the lowest-cost parts on the machine and the most common cause of a pattern complaint, so look at it before you touch the pump. If the pattern has degraded, replace the tip. Do not push a pump rebuild when the tip is the problem.
The Impact 340 Accessories page lists the 661-020 Tip Seat and Seal Kit (5 Pack) and the 0289228 Tip Guard, G-THREAD. A tip seat or seal that is leaking at the gun end can look like a pump fault, so replace the seal while the tip is out.
Step 2: filters and the inlet screen
Partly blocked filters cause pressure loss, pulsing and spitting, and they are the second quickest thing to fix. Clean them after every job. The 340 Accessories page lists mesh filters in several grades: 500-200-03 (green, 30 mesh, coarse), 500-200-06 (medium), 500-200-10 (yellow, 100 mesh, fine) and 500-200-15 (extra fine, 150 mesh). Match the mesh to the coating you are spraying.
On the suction side, the 700-805 Inlet Screen Filter is callout 4 on the Impact 340 Suction Set Assembly page. If it is clogged the pump starves, so pull it out and clean it.
Step 3: the suction set and air leaks
Titan's Impact manuals list an air leak at the siphon tube or suction set as a cause of both a failure to prime and a failure to build pressure. The suction set is on its own page: Impact 340 Suction Set Assembly Parts. Look at the two O-rings, 704-109 (callout 5A) and 9871105 (callout 5), plus the 9822526 Retaining Clip (callout 6). The complete 0558672A Suction Set Assembly and the 0558659A Return Tube are on the same page if a tube is cracked or kinked.
Step 4: the inlet valve and pusher
If the sprayer still will not prime, the inlet valve may be stuck. Titan's manuals tell you to free a stuck inlet ball with the pusher stem. The site lists the 0532925 Inlet Pusher Kit against the 340 and 400 pump diagram. If the ball is stuck because it is worn or dirty, clean the valve and check what it seats against.
The inlet side of the pump is on the page Impact 340 Drive Assembly Parts II. Despite the name, that page holds the fluid-section parts, so open it for every valve and packing part in this checklist. The inlet parts to look at are the 762-145 Inlet Valve Ball (callout 29), the 704-703 Inlet Valve Cage (callout 28), the 704-054 Foot Valve Housing (callout 32) and the 762-058 Seat O-Ring (callout 31).
Step 5: the outlet valve, then the packings
Worn valve balls and seats cause pulsing, pressure loss and priming trouble. The 50164 Outlet Valve Ball is callout 22 on the same page, next to the 227-006 Outlet Fitting (callout 10). Titan's manuals say a seat can be reversed or replaced, and a leaking external fitting should simply be tightened.
Packings come last because they are the biggest job. Signs they are done are paint leaking at the wet cup, paint inside the wet cup, surge at the gun, or pressure that will not hold even with a good tip, clean filters and good valves. The 0532911 Fluid Section Repacking Kit and the 0532921A Repacking Kit are the kits the diagrams list for the 340 and 400 pump, and the 0532915 Lower Packing is also listed on the 340, 400 and 410 diagrams. Check the callout on the diagram against your pump before you order. For the lower seal, the accessories page lists the 0551509 Lower Seal Packing Tool.
Step 6: switch, motor and board
If the unit will not run, rule out the simple causes first: not plugged in, a tripped breaker, the pressure knob turned to minimum, or a motor that is too hot and needs to cool. After that, the electrical parts are on Impact 340 Drive Assembly Parts I: the 9850936 Power Switch (callout 3), the 0532812 Motor Assembly (callout 5), the 0532208A Circuit Board Assembly (callout 18) and the 0293938 2nd Stage Gear Assembly (callout 8). Titan's manuals send wiring and motor faults to a service center, so confirm the fault with our parts team before ordering motor or board parts.
A short list to keep on the shelf
- A tip and the tip seat and seal kit (661-020).
- Spare filters in the mesh you spray with, such as 500-200-10.
- Suction set O-rings 704-109 and 9871105.
- Inlet valve kit 805-846, listed on the 340 accessories page.
- Piston lube 314-480 for the packings.
- A repacking kit chosen from the diagram (0532911 or 0532921A).
Impact 340 wear parts from the checklist:
Valves, cage, seat O-ring and fluid-section parts.
Inlet screen, O-rings, clip and return tube.
Tip seat kit, filters, hoses, lube and valve kit.
Switch, motor, circuit board and gear.
Bottom line
Work down the list: tip, filters, suction set, inlet valve, outlet valve, packings, then electrics. Each step is generally quicker and less costly than the one after it, and each has its own Impact 340 diagram page. If you are unsure which part applies, call (713) 931-0006 with your model and serial number.
Not sure which Impact 340 part you need?
Have your model and serial number ready and call (713) 931-0006, or open the Impact 340 diagram pages and match the callout.
(713) 931-0006Order by Parts Diagram