On a gas PowrLiner the engine drives the pump, the pump pushes paint through a filter and the hose, and the gun puts it on the pavement. On our site each link is its own diagram: engine or convertokit, drive and fluid section, filter, gun holder and gun. Open the page for your model and match the callout number.
The chain from engine to gun
Every gas-powered PowrLiner moves paint the same way, even though the machinery in the middle differs by model. A gasoline engine supplies the power. A drive turns that power into pump strokes. A fluid section draws paint up through a suction hose and inlet screen, and pushes it out under pressure. A filter catches debris, a hose carries the paint to the gun, and the gun, with its tip, sets the line width.
That chain is useful because a failure shows up at one link, and each link has its own page on our site. Low pressure points to the pump end. Surging or spitting points to the filter or valves. A ragged line points to the tip. Fuel and starting problems point to the engine. Start with the symptom, find the link, then open that diagram.
Three ways the power reaches the paint
The biggest difference between gas PowrLiners is how the engine's power gets to the pump. This changes which parts you will ever replace, so it is worth knowing before you shop.
Engine and drive by model
| Model | Engine (Titan data) | Drive | Pump end |
|---|---|---|---|
| PowrLiner 850 | 37.7 cc 4-stroke | Clutch-driven | Piston pump with packings |
| PowrLiner 3500 | Honda GX120 | PermaStroke sealed hydraulic, no clutch | Sealed system; no piston or packings |
| PowrLiner 4955 | Honda GX120, pull start | Hydraulic drive | Fluid section with packings |
| PowrLiner 6955 | Honda GX160, electric start | Hydraulic drive | Fluid section with packings |
| PowrLiner 8955 | Honda GX200, electric start | Hydraulic drive | Fluid section with packings |
Specifications from Titan and the owner's manuals. Titan also lists gas and DC-electric configurations for the hydraulic models; this guide covers the gas side.
On the 850 the engine turns a clutch assembly, a second-stage gear assembly and a piston rod. On the 3500, Titan says there is no piston, packings, cylinder or clutch to wear or replace, so there is no repacking job on that machine. On the 4955, 6955 and 8955 the engine drives a hydraulic system, and a hydraulic motor strokes the fluid section. Because of that, the same word "pump" means a different set of parts on each family.
The engine end: where the engine parts live
On the hydraulic PowrLiners the engine is listed on a gas convertokit page, with the pieces that mount it. The 4955 page shows the 980-332A Honda Gas Engine, 4.0 Hp together with an engine mounting plate, a pulley, a positioning bracket, a spring retainer and a vibration pad. The 6955 and 8955 pages list their own Honda engines, 0537546A and 0537547A. The engine part number differs by model, so do not carry a number from one page to another.
- 4955 gas convertokit: engine 980-332A, mounting plate, pulley, vibration pad.
- 6955 gas convertokit: engine 0537546A, motor mounting plate, vibration pad.
- 8955 gas convertokit: engine 0537547A, pulley, motor mounting plate, vibration pad.
- 3500 and 3500S: the 980-332A engine appears on the Main Assembly page rather than a convertokit page.
If your engine will not start or has been replaced, check the page for your exact model and confirm by phone before ordering. Our parts team can match the engine to your serial number on (713) 931-0006.
Engine, mounting plate and pulley for the 4955.
Honda engine and mounting parts for the 6955.
Honda engine, pulley and mounting parts for the 8955.
The pump end: drive and fluid section
The 850's drive assembly page holds the whole pump end in one place. It lists the 759-365 Fluid Section Repacking Kit, the 759-379 Inlet Valve Assembly, the 0290122 Piston Rod, the 0512533A Lower Seal, the 0293931A pump housing and the 0293938 second-stage gear assembly. The clutch assembly and recoil start sit on the Main Assembly page.
On the 4955, 6955 and 8955 the pump end is split across three pages: the Hydraulic System (tank, filter, hydraulic pump, dipstick), the Hydraulic Motor (piston, seals, spool valve) and the Fluid Section (rod, cylinder, valves, packings). Part numbers in these differ by model, which is why the model-specific page matters more than a general parts list.
Filter, hose and gun: the delivery side
After the fluid section, paint passes a manifold or high-pressure filter on the hydraulic models, then the hose and the gun. The 4955 High Pressure Filter page lists a 930-006 Manifold Filter and a 930-050 Filter Service Kit. The 3500 lists a 730-067 60 mesh manifold filter on its own filter page. The 850 relies on a 10-mesh inlet filter and a white gun filter (581-060) on its spray gun page.
The standard package on the 850 and 3500 includes a 1/4" x 50 ft hose, and the 850's Main Assembly page lists the 316-505 50' Spray Hose. The gun sits in a gun holder assembly with its own page on every model, which matters if the gun mount is sloppy rather than the gun itself. The tip that comes with the 850 and 3500 is the TR1 419.
Matching the symptom to the page
Where to look first
| What you see | Link in the chain | Open this page |
|---|---|---|
| Engine will not start or runs rough | Engine | Gas convertokit (hydraulic models) or Main Assembly (850, 3500) |
| Paint does not prime or pressure will not build | Pump end | Drive assembly (850) or Fluid Section (4955/6955/8955) |
| Leaks at the pump or paint in the oil cup | Packings | 850 drive assembly, 4955/6955/8955 fluid section |
| Surging or spitting | Filters | Filter pages, gun page |
| Wide, ragged or streaky line | Tip and gun | Spray gun page, TR1 tips |
| Gun will not hold position | Gun holder | Gun Holder Assembly page |
General troubleshooting order: least expensive and easiest first (filters, tip), then valves, then packings.
Work from the least expensive fix to the most expensive. Clean the filters and swap the tip before opening the pump. If pressure is still low, the valves and then the packings come next. The 3500 has no packings to replace; its valve repair kit and pump head pages are the equivalent.
Common replacement parts
These parts are listed on the gas PowrLiner diagram pages discussed above. Prices on the grid are live.
Bottom line
Treat a gas PowrLiner as engine, drive, fluid section, filter, hose and gun. Find which link is failing, open that model's diagram, and match the callout number to the part. Part numbers change from model to model, so confirm yours by diagram or by phone at (713) 931-0006.
Not sure which assembly your part sits in?
Give us your PowrLiner model and serial number and we will confirm the diagram and part number.
(713) 931-0006Order by Parts Diagram