The 550 and 850 are both clutch-driven piston-pump stripers with a 37.7 cc engine and 0.33 gpm delivery. Titan lists DirectLink pressure control, an AutoOiler and a lockable front wheel on the 850, while the 550 runs at fixed pressure with a fixed front wheel. On our drive assembly pages, every 550 part also appears on the 850 page.
The 550 in brief
The PowrLiner 550 is the older entry machine: a clutch-driven striper with a 37.7 cc 4-stroke engine and a 0.33 gpm delivery, sold as a basic one-gun line striper. Its pressure is fixed, so there is no pressure control to turn, and its front wheel is fixed too, so it always tracks straight. Older manuals carry the SpeeFlo name ("SPEEFLO PowrLiner 550 / 850"), which is the same product line as Titan. Titan's item number for the 550 is 0290004.
Published figures for the 550's maximum pressure, weight and tip size disagree between the manual-based pages and dealer listings, so this guide does not quote them. If a used 550 is on offer and any of those matter, read the manual for that machine.
What Titan lists for the 850
- DirectLink pressure control, where the 550 runs at a fixed pressure.
- Reversible gun mount that stripes off the front or the rear tire (not confirmed either way for the 550 in our sources).
- Front wheel that locks straight or casters free, where the 550's wheel is fixed.
- AutoOiler, a button that sends oil from a reservoir to the packings. Only the 850 main assembly page lists an oiler mounting bracket.
- Removable gun for stenciling (also not confirmed for the 550 in our sources).
The 850's engine and delivery are the same as the 550's: 37.7 cc and 0.33 gpm, and the 850's pressure rating is 3000 psi. The two confirmed differences, fixed pressure and a fixed front wheel on the 550, are about control and convenience, not extra output.
What the diagrams share
The strongest reason to read the two diagrams together is that most of the pump and drive is common. We compared the two drive assembly pages part by part:
- Drive assembly: every part on the 550 drive assembly page is also on the 850 drive assembly page. Both list the 0290122 piston rod, the 759-365 repacking kit, the 759-379 inlet valve assembly, the 0293938 gear assembly, the 0293931A pump housing, the 0293936 clutch assembly and the 0293943 engine. The 850 page adds three: a dowel pin, a throttle cable assembly and a seal.
- Spray gun: six of the seven gun parts are shared, including the 759-369 gun assembly and the 651-020 and 0297007 tip seals. The tip guard package is the one difference: the 550 page lists 0289228A, the 850 page 661-010A.
- Main assembly: 13 parts are shared, including the clutch assembly, suction set, recoil and the 50 ft spray hose. The 550 page lists its own gun cable, engine cable and cable assembly. The 850 page lists a front cover, a gun cable and an oiler mounting bracket.
- Cart: every 550 cart part is on the 850 page. The 850 page adds a locking lever, a retainer, a mounting disk and a wheel bracket, which is consistent with the lockable front wheel Titan lists for the 850.
These are diagram listings, not a statement from Titan that parts interchange. The same part number on both pages is a strong sign, but fitment depends on your serial number and production year. Call (713) 931-0006 with the model and serial number before you order, particularly for anything that is not on both pages.
What the 550 pump is made of
The 550 pump is a piston pump, so a piston rod moves through packings in a fluid section. The diagram lists the pieces: 0290122 piston rod, 0512387 top nut, 0512533A lower seal, 759-379 inlet valve assembly and the 759-365 fluid section repacking kit, plus a 759-380 prime spray valve assembly.
How a piston pump fails is general knowledge across makes. Worn packings let pressure leak off, and a scored piston rod ruins new packings, so inspect the rod when you repack. A worn inlet valve causes pulsing, a loss of pressure or a failure to prime. If you are buying a used machine, ask whether the pump holds pressure and whether the rod is smooth before you ask about anything else. Titan does not publish a packing life for the 550, so there is no hours figure to check against.
Tips and accessories
The 550 accessories page lists Titan's TR1 line striping tips: for example 697-419, 697-415, 697-619, 697-421 and 697-821, among others. TR1 tips are Titan's reversible line-striping tips, and the 419 is the tip supplied with the 850. Titan does not publish what the digits mean in our sources, so we do not explain them. Use the tip numbers as listed, and call (713) 931-0006 if you are not sure which suits your coating.
Finding your 550 parts
Piston rod, repacking kit, inlet valve, gear assembly, pump housing and engine.
Clutch assembly, recoil, suction set, filter cover, cables and the spray hose.
Gun assembly, tip seals, white filter and tip guard package.
TR1 line striping tips for the 550.
The 550 also has cart and gun holder pages on the site. Owner's manuals are on our manuals page.
Shared pump parts and tips that appear on both the 550 and 850 diagrams:
−14%
The Short Version
The 850 adds pressure control, an AutoOiler and a lockable front wheel to a pump and engine the 550 already has. On our drive pages every 550 part also appears on the 850 page. Use the 550 diagrams for a 550, confirm anything unusual by phone, and read the manual before trusting any maximum figure.
Buying parts for a 550?
Call (713) 931-0006 with the model and serial number and our parts team will confirm the part against the diagram before you order.
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