Clean the inlet screen at least once a day, because Titan's manual says it clogs. If a foot valve seat is worn on one side, flip it to the unused side and replace it only when both sides are worn. Keep the siphon hose threads taped and sealed. On the 6900 Plus DI the ball is 0509707 and the seat is 0509623.
Where the foot valve sits and why it matters
A PowrTwin is a hydraulic-drive piston sprayer. On the intake stroke the foot valve opens and lets coating into the fluid section, and on the pressure stroke it closes so the coating goes out through the outlet valve instead of back down the hose. DI models are the ones Titan describes as having a submersed foot valve for very heavy materials such as drywall mud. Titan does not define the letters DI, so this guide just says DI models.
The owner's manuals tie several stoppages to this valve. A sprayer that delivers on the upstroke only, which the manual calls a downstroke dive, points to the lower foot valve ball not seating because of trash or wear. Other listed causes are material that is too viscous and an air leak on the siphon side. Since the foot valve is easy to reach and inspect, look at it before you suspect the packing.
Clean the inlet screen every day
The manual says the inlet filter screen must be cleaned at least once a day. Paint skins, fibers and dried flakes collect on it and can starve the pump. Titan's DI manual lists a 10 mesh Rock Catcher inlet filter for these models. Wash the screen after the day's flush and look for torn mesh. A torn screen lets trash through to the ball and seat.
- Clean the screen at the end of every day, and again if the pump begins to starve during the job.
- Replace a screen with torn or distorted mesh. On the 6900 Plus DI the fluid section diagram lists an inlet screen 451-018; on the 12000 Plus DI it lists 710-046.
- The accessories pages also list a separate 0509762A inlet screen, which is the one in Titan's DI manual accessory list.
Check the ball and seat
Follow your manual for taking the foot valve apart, with pressure relieved first. What the manual tells you to look for is wear on the ball and seat and trash lodged between them. A ball stuck to the foot valve seat is also on its list, and it makes the pump run fast on both strokes. If the seat is worn only on one side, you do not need a new one.
Flip a worn seat before you replace it
Titan's manual says that if a foot valve seat or outlet valve seat is worn on one side, you can flip it to the unused side, and that you replace it only if both sides are worn. That makes the seat the part to inspect before you order. When the seat is out, look at the ball and the seat O-ring as well.
Seal the siphon hose
The manual says the siphon hose threads must be taped and sealed, because air leaks on the suction side cause erratic operation. It also says the strokes should take about the same time up and down. The manual also lists one stroke becoming faster than the other as a reason to service the fluid section sooner than the routine interval. A new hose with an unsealed thread has the same air leak problem as an old one.
Foot valve parts by model
The two DI fluid sections share the ball, seat, seat O-ring and cage but have different housings and inlet screens, so use the diagram for your sprayer.
Foot valve parts on the DI fluid section diagrams
| Part | 6900 Plus DI | 12000 Plus DI |
|---|---|---|
| Foot valve ball | 0509707 | 0509707 |
| Inlet valve seat | 0509623 | 0509623 |
| Seat O-ring | 0509708 | 0509708 |
| Foot valve cage | 236-141 | 236-141 |
| Foot valve housing | 451-132 | 459-019A |
| Foot valve assembly | 451-133A | 459-021A |
| Inlet screen | 451-018 | 710-046 |
From the 6900 Plus DI and 12000 Plus DI fluid section diagrams. Do not take a housing or screen number from the other model.
The full parts are on the 6900 Plus DI fluid section and 12000 Plus DI fluid section pages, and the accessories on the 6900 Plus DI accessories page. If you are replacing several fluid section parts at once, the minor kit (144-050) is listed on both diagrams, so ask us what it contains before you order.
Foot valve parts for DI models:
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The Short Version
Clean the screen daily, seal the siphon threads, and flip a worn seat before you buy a new one. When you do order, take the housing and screen number from your own model's diagram, since the 6900 and 12000 use different ones.
Not sure which foot valve parts fit?
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