The 8900 Plus fluid section is built around the 144-117 displacement rod and the 144-832 pump cylinder. Packings, the outlet valve and the foot valve are the wear items, covered by the 138-153A repacking kit, the 144-050 minor kit and the 144-500 major kit. Titan's manual puts routine service at about 1,000 hours.
What is on the diagram
The PowrTwin Plus 8900 Fluid Section Parts page lists 24 items. Think of it as the paint end of the sprayer: a rod driven by the hydraulic motor, packings around that rod, and two valves that decide which way the coating moves.
On the 8900 Plus the rod is called the displacement rod, 144-117 (callout 6), and it runs in the 144-832 pump cylinder (callout 13). The 143-120 connecting pin (callout 2) joins the rod to the motor side, and the 143-019 retaining ring (callout 1) holds it. Rod and cylinder numbers differ from model to model, so do not copy them from a 6900 or 12000 page. Check the rod surface when the pump is open, because a scored rod ruins fresh packings.
Packings
The packings seal the rod so the pump can build pressure. The diagram lists the 138-153A repacking kit (callout 4), the 142-004 upper packing spring (callout 5) and the 142-003 lower packing spring (callout 7). We do not list what is inside the repacking kit, so confirm that with our parts team.
Two entries in the manual's troubleshooting table lead to the packings: chatter, which it blames on an upper packing swollen by solvent, and delivery on the downstroke only, which can also be the upper ball. Leather packings go in after an oil soak, and the daily job is topping the packing oil cup up halfway with Piston Lube (314-480).
Outlet and foot valve
8900 Plus valve parts on the fluid section diagram
| Valve | Parts and callouts |
|---|---|
| Outlet valve | 0509710 ball (9), 236-012 seat (10), 236-032 seal washer (11), 236-031A housing (12) |
| Foot valve | 0509707 ball (17), 0509623 seat (18), 0509708 seat O-ring (19), 236-141 cage (16), 236-126 foot valve (20) |
| Other hardware | 145-031 O-rings (3), 140-009 O-ring (14), 236-030 washer (15), 0528296 lock ring or nut (21) |
Match the callout on the page, because several of these parts appear on more than one PowrTwin diagram.
Valve faults show up as a pump that cycles without delivering or a pressure that sags. If paint comes out on the up stroke only, the manual suspects the lower ball or a siphon air leak. If the pump races in both directions, it lists an empty pail, thick material, a ball stuck to its seat or a kinked hose. A seat worn on one side can be turned over to its unused face, and only a seat worn on both sides needs replacing.
Kits and assemblies
- 144-050 fluid section minor service kit. The contents Titan's 6900 DI manual gives are retaining ring, PTFE O-rings, packing sets, both valve balls, seal washer, seat O-ring and Loctite, so ask us to confirm the 8900 contents.
- 144-500 major fluid section service kit, listed on the 8900 Plus diagram. We have not confirmed its contents, so ask us before ordering.
- 236-050 outlet valve assembly, for replacing the outlet valve as one piece.
- 236-010A foot valve assembly, for replacing the lower valve as one piece.
Titan's 6900 DI manual describes its major kit as the minor kit plus a rod and cylinder. Do not assume the 8900's 144-500 follows that pattern until we confirm it. If several parts are due, a kit saves opening the pump twice, and a single damaged ball or seat is cheaper to fix on its own.
When to service
The manual's routine interval is about 1,000 hours of use. Open the pump earlier when the top packing leaks or one stroke runs faster than the other; a healthy pump takes about the same time up and down. Titan does not publish a life figure for individual parts, so treat the hour count as a scheduling aid only.
8900 Plus fluid section parts often ordered:
−8%
Every numbered part for the 8900 Plus pump.
The rest of the sprayer's major parts.
Piston Lube, filters, hoses and fluids.
The Short Version
Order the 8900 Plus rod, cylinder and valves from the 8900 Plus diagram, not another model's page. Keep the 138-153A repacking kit and the 144-050 minor kit on hand for routine service, and call (713) 931-0006 if you are unsure what the 144-500 major kit includes.
Not sure which kit fits your 8900 Plus?
Call (713) 931-0006 with your model and serial number and our parts team will confirm the parts before you order.
(713) 931-0006Order by Parts Diagram