PowrLiners use three pump drives. The 850 is clutch-driven, with a clutch, gear set and piston pump that has packings. The 3500 uses Titan's PermaStroke sealed hydraulic system, which Titan says has no piston, packings, cylinder or clutch to wear or replace. The 4955, 6955 and 8955 use a hydraulic motor to stroke a fluid section with packings, and they run on Coolflo.
Why the drive matters
Every PowrLiner has an engine and a pump, but how the engine's power reaches the pump differs across the line, and that sets your spares list. A piston pump has packings that seal the rod, a wet cup or oil cup that keeps them lubricated, and valves with seats and balls. If the pump is a different design, those parts are not there to buy, and a repair guide for one drive does not apply to another.
No drive is better than the others in every case. They are built for different sizes of job, with the 850 at the small end and the hydraulic 8955 at the large end. This guide is about what each one asks of you in parts and routine, so you can read a parts diagram knowing what you should expect to find on it.
Clutch-driven: PowrLiner 850
Titan lists the 850 as a clutch-driven machine. A 37.7 cc four-stroke engine drives a piston pump through a clutch and gearing, and the pump is rated to 3000 psi and 0.33 gpm. Titan's page for the 850 also lists an AutoOiler, a button that delivers oil from a reservoir to the packings. The manual's instruction is to press it two to three times before each use, and to clean the gun filter after every use.
On the 850 drive assembly page you will find the parts that go with a clutch and a piston pump:
- 0293936 clutch assembly (packaged) and 0293938 2nd stage gear assembly. The main assembly page lists a separate 0293929 clutch assembly, so match the number to the page that shows the part you have.
- 0290122 piston rod and 0512533A lower seal.
- 759-365 fluid section repacking kit.
- 759-379 inlet valve assembly and 759-380 prime spray valve assembly.
Older SpeeFlo-era 550 diagrams share the same drive parts as the 850, so the 550 drive page is a good cross-check if you own the earlier machine.
PermaStroke sealed hydraulic: PowrLiner 3500
PermaStroke is Titan's term for the 3500's sealed hydraulic system. Titan says it has no piston, packings, cylinder or clutch to wear or replace, no electronics, a working range of 300 to 3300 psi and two field-serviceable wear parts. We repeat that as Titan's statement; the sources we use do not name the two parts, and they do not give a service interval.
What the site's diagrams show is a pump built around valves and a pump head rather than packings. The inlet valve body and outlet valve pages list the 2393043 inlet valve and the 2369445 outlet valve assembly, and the pump assembly page lists the 0537903 valve repair kit, the 340241 diaphragm assembly and the 2408084 pump head kit. The 3500 manual's service section covers checking, cleaning and replacing the inlet and outlet valves.
Hydraulic drive with a fluid section: 4955, 6955, 8955
These three work differently from both of the above. The engine runs a hydraulic pump, a hydraulic motor strokes the fluid section, and the fluid section moves the paint. Titan describes the drive as smooth and slow-stroking and says it extends the life of the sprayer. That is Titan's claim, and the manual still asks for routine care.
The care is specific. The manual makes Titan Coolflo the only hydraulic fluid allowed and has you check the level daily up to the Full mark on the dipstick. It also says to fill the packing oil cup half full with Piston Lube. Both are on the site: 430-361 Coolflo by the gallon and 314-480 Piston Lube.
The diagrams are split to match. On the 4955, the Hydraulic Motor page lists the 235-050 service motor kit, a piston seal (235-027) and a rod seal (235-028). The Fluid Section page lists the 106-002A repacking set, a displacement rod and the foot and outlet valve parts. The 6955 and 8955 have their own pages with their own numbers.
Spares by drive type
What each PowrLiner drive means for parts
| Drive | Models | Wear and service items on the diagrams | Fluid or lubricant named |
|---|---|---|---|
| Clutch-driven piston pump | 850 (and 550) | Clutch, gear set, piston rod, lower seal, repacking kit, inlet valve | AutoOiler reservoir for the packings; clean the gun filter after every use |
| PermaStroke sealed hydraulic | 3500, 3500S, 3500 72V | Inlet valve, outlet valve assembly, valve repair kit, diaphragm assembly, pump head kit; no packings | None named in our sources; check your manual |
| Hydraulic drive with fluid section | 4955, 6955, 8955 | Repacking set, rod, cylinder, foot and outlet valves, hydraulic motor service kit | Coolflo only; Piston Lube in the oil cup |
No service intervals are given because Titan's sources do not publish any for these parts. Replace on symptoms and inspection, and follow your manual.
Choosing and ordering
Identify your model
The drive follows the model: 850 or 550 is clutch-driven, 3500 is PermaStroke, and 4955, 6955 and 8955 are hydraulic drive.
Open that model's diagram
Use the drive assembly page for the 850, the pump assembly page for the 3500, and the fluid section and hydraulic motor pages for the larger machines.
Order by the numbered callout
Match the callout on the diagram to your part. Part numbers differ between models, even where parts look the same.
Call if the model is unclear
Phone (713) 931-0006 with the model and serial number. The manual for your unit is on our manuals page.
One or two parts from each drive type, so you can compare what each one asks for:
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The Short Version
The 850 has a clutch and packings, the 3500 has neither, and the 4955, 6955 and 8955 have packings but a hydraulic motor instead of a clutch. Match the model to its diagram, keep Coolflo and Piston Lube for the hydraulic models, and take procedures from the manual.
Which drive does your PowrLiner have?
Call (713) 931-0006 with your model and serial number and our parts team will point you to the right diagram and part.
(713) 931-0006Order by Parts Diagram