A PowrTwin that delivers only on the upstroke, or dives on the downstroke, usually has a lower foot valve ball that is not seating, from trash or wear. Downstroke only points at the upper ball or a worn lower packing. Chatter means solvent has swollen the upper packing. Check the tip, filters, hose and siphon connections first.
The tables below follow the troubleshooting section that appears, identical, in Titan's Plus and DI owner's manuals. A symptom points to a likely cause, not a certainty, so confirm against your own manual before ordering. Examples use the Plus 6900 diagrams; other models list their own part numbers.
Check these first
Several problems that look like pump failure cost nothing to rule out. The manual lists these for low pressure at the gun:
- A worn tip. A worn orifice drops pressure and coarsens the pattern.
- A clogged outlet filter or gun filter.
- A hose that is too small or too long for the job.
- Low voltage, on electric models.
- Air leaking in on the siphon side. Siphon hose threads must be taped and sealed; the manual says air leaks cause erratic operation, and surging is on its list for a suction leak.
Also look at the supply. A pump that suddenly runs fast both ways may simply have an empty container, material that is too thick, or a kinked hose. The siphon parts are on the Plus 6900 siphon hose page.
Upstroke only, or downstroke dive
When the pump delivers going up and then dives, or only moves paint on the upstroke, the manual points first to the lower foot valve ball not seating, because of trash caught under it or wear. It also lists material that is too viscous and an air leak on the siphon side. The foot valve parts on the Plus 6900 fluid section page are the 0509707 foot valve ball and the 0509623 inlet valve seat. Clean the valve before you replace anything: trash is the free explanation.
Downstroke only, fast, or slow
Stroke symptoms in Titan's manual
| What you see | What the manual lists | Parts and pages |
|---|---|---|
| Moves paint on the downstroke only | Upper ball not seating, or lower packing worn | 0509710 outlet valve ball, 236-012 outlet valve seat, 138-153A repacking kit |
| Runs fast up and down | Empty container, thick material, ball stuck to the foot valve seat, kinked hose | Check supply first; foot valve ball and seat if it persists |
| Runs slowly with the gun off | Loose connection, bleed valve open or worn, worn lower packing, balls not seating | 944-050 bleed valve service kit, then the packing and valve parts |
| Pattern tails or shows an hourglass | Inadequate delivery | Tip, filters, then the pump |
| Pattern surges | Suction leak or pulsating delivery | Siphon hose connections |
| Pattern is round | Worn tip or fluid too heavy | Tip, coating |
Strokes should take about the same time up and down. A big difference is itself a sign to inspect the fluid section.
Chatter
The manual's explanation for chatter is that solvent has swollen the upper packing, and the fix is to replace it. The packing set on the Plus 6900 is the 138-153A repacking kit, with the 142-004 upper and 142-003 lower packing springs listed beside it. Keep in mind that the manual says not to substitute oil, water or solvent for Piston Lube in the packing oil cup. On a larger pump, open the 12000 Plus fluid section page and check the callouts before you order, because the larger fluid sections have different rods and cylinders.
Flip it before you replace it
Titan's manuals say that a foot valve seat or outlet valve seat that is worn on one side can be flipped to the unused side. Replace the seat only when both sides are worn. Titan gives about 1,000 hours of use as the routine fluid section service point, or sooner if the top packing leaks or one stroke becomes faster than the other. The manual also says that a scored piston rod ruins new packings, so inspect the rod while the pump is open; do not skip that step.
When it is not the pump
If the hydraulic motor stalls, or pressure is low while the sprayer runs hot, the manual points to the motor side: a sticking valve, a broken spring or valve rod assembly, air in the motor, or a blown piston seal or spool valve O-rings. Those parts are on the hydraulic motor page for your model. Cycling the sprayer at low pressure for 5 to 10 minutes purges air from the motor or fluid pump.
Parts by symptom, Plus 6900 examples
| Symptom | Likely part | Diagram page |
|---|---|---|
| Upstroke only, dive | Foot valve ball 0509707, inlet seat 0509623 | Fluid section |
| Downstroke only | Outlet valve ball 0509710, seat 236-012, lower packing | Fluid section |
| Chatter | Repacking kit 138-153A | Fluid section |
| Slow with gun off | Bleed valve parts, kit 944-050 | Bleed valve |
A symptom does not always mean one part. Work down the list in your manual and buy only what the check points to.
Parts most often tied to these symptoms:
−8%
The Short Version
Rule out the tip, filters, hose and siphon threads first. Then match the stroke pattern: foot valve ball and seat for upstroke only, upper ball or lower packing for downstroke only, upper packing for chatter. Call (713) 931-0006 with your model and serial number if the diagram leaves any doubt.
Not sure which part your symptom points to?
Call (713) 931-0006 with your model, serial number and what the pump is doing and our parts team will help narrow it down.
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