The Hydra M2000 pump is the 315-555, the M4000 pump is the 245-555 and the Pro IV pump is the 185-551, and each has its own diagram and part numbers. The packing sets are 314-030A and 314-040A on the M2000, 240-001A on the M4000 and 178-001A on the Pro IV, with foot valves 317-925, 245-018 and 183-992. Order from the diagram for your model.
Three pumps, three diagrams
Titan's Hydra M and Pro IV sprayers all work the same way: a hydraulic motor drives a piston-type fluid pump, and the pump moves your coating. The pump itself is a different assembly on each model, and the site keeps a separate parts diagram for each one. Parts that look the same across the three are not necessarily interchangeable, so the first job is to open the right page.
Fluid pump diagram, key parts and what each is called on the site
| Hydra M2000 | Hydra M4000 | Hydra Pro IV | |
|---|---|---|---|
| Pump diagram | 315-555 | 245-555 | 185-551 |
| Upper packing | 314-030A Upper Packing Set | 240-001A Upper/lower Packing Set | 178-001A Upper Packing Set |
| Second packing set | 314-040A Lower Packing Set | 240-001A (same set, second callout) | 183-001A Packing Set |
| Foot valve | 317-925 Foot Valve | 245-018 Foot Valve | 183-992 Foot Valve Assembly |
| Displacement rod | 315-932 | 245-009 | 185-984A |
| Pump block | 315-917 | 245-907 | 181-906 Lower Pump Block |
| Pump cylinder | 315-951 | 245-012 | 183-930 Cylinder Pump |
Numbers are from the site's diagram pages. The M2000 and M4000 pump numbers differ throughout; do not substitute one for the other.
Titan describes the Hydra M pump with large tungsten carbide valve seats, hardened stainless steel balls and self-adjusting packings, and the Pro IV manual lists the same valve, packing and foot valve features. Titan publishes no hour or gallon life for any of these parts, so replace on symptoms and inspection. This guide is for finding the parts. The motor side has its own page, the 441-576 hydraulic motor diagram.
Hydra M2000 pump parts (315-555)
The M2000 diagram is the one that splits the packing into two separate sets, so you can order upper or lower on its own.
Hydra M2000 315-555 pump parts
Two O-ring numbers are also on the page, the PTFE 315-010 (callout 6) and 315-009 (callout 21), plus a synthetic rubber 315-122 (callout 20). When you strip the pump, match each old O-ring to its callout before you order.
Hydra M4000 pump parts (245-555)
The M4000 diagram lists one 240-001A Upper/lower Packing Set and calls it out twice, at callouts 2 and 10, then lists the hardware around it separately: the 245-005 spring upper packing, 245-013 upper spring retainer, 245-014 lower packing spring and 245-020 lower packing retainer.
Hydra M4000 245-555 pump parts
Hydra Pro IV pump parts (185-551)
The Pro IV pump has its own diagram and numbers. It lists a 178-001A Upper Packing Set (callout 4) and a separate 183-001A Packing Set (callout 11), with 182-906 upper and 185-010 lower packing springs and a 185-011 spring retainer. The foot valve is sold as an assembly, 183-992, at callout 16. The piston seat is a 182-921A assembly (callout 13), the rod is 185-984A (callout 2), and the 920-103 and 314-180 stainless balls appear at callouts 12 and 17. The 240-022A ball cage assembly and 241-109 pin ball stop are listed on this page too, without a callout number.
Service kits: what the site lists
The site lists pump service kits on the Hydra accessories and M4000 accessories pages. Their fitment notes are loose, and Titan's kit contents are not published here, so treat the table as a list of numbers to ask about, not a guide to what is inside.
Pump service kits on the site
| Kit | Name on the site | Fitment note on the listing |
|---|---|---|
| 245-500 | Major Service Kit | Hydra M, Hydra Pro 2000/4000 and Hydra Pro Super; also shown on the M4000 Major Components page |
| 315-500 | Major Pump Service Kit | Hydra M and Hydra Pro series |
| 315-050 | Pump Service Minor Kit | Hydra M and Hydra Pro series |
| 185-500 | Major Pump Service Kit | Hydra M and Hydra Pro series |
| 185-050 | Fluid Section Minor Service Kit | None listed |
Call (713) 931-0006 with your pump number (315-555, 245-555 or 185-551) and we will confirm which kit matches it.
A kit makes sense when the inspection shows several parts due at once. If only the upper packing set or a single ball is damaged, ordering that part by number from the diagram keeps the order smaller. Because the 315 and 185 kit listings only say "Hydra M and Hydra Pro series", do not assume a kit number matches your pump by its first digits.
Keeping the packings alive
The upper packing is lubricated through the wet cup. On the Pro IV, Titan's manual calls for Piston Lube (314-480) and says not to substitute water or paint solvent. On the Hydra M, use the fluid your manual names for the wet cup. Titan's manuals also tie one fault directly to the upper packing: a pump that chatters has an upper packing swollen by solvent, and the fix is to replace the packing set.
Flush the sprayer after the job and strain your coating so grit does not reach the foot valve. Trash or wear at the lower foot valve ball is one reason the manual lists for a pump that delivers on the upstroke only.
How to find the right pump part
Identify the pump
Hydra M2000 uses the 315-555, M4000 the 245-555, Pro IV the 185-551. Your model plate and manual confirm it.
Open that diagram and read the callouts
Find the packing, valve or ball by callout number. Parts with similar names sit on all three pages with different numbers.
Match the part to the symptom
Chatter points to the upper packing, an upstroke-only pump to the lower foot valve, and a pump that runs fast to an empty container or a stuck bottom ball.
Call for fitment
Have the model and serial number ready at (713) 931-0006. The rebuild procedure is in your manual on our manuals page.
Fluid pump parts most often ordered from these diagrams:
The Short Version
The M2000 pump is 315-555, the M4000 is 245-555 and the Pro IV is 185-551. Know which one you own, order the packing set, foot valve and balls by number from that page, check the rod for scoring while the pump is open, and ask us what each kit contains before you buy it.
Not sure which pump diagram is yours?
Call (713) 931-0006 with your model and serial number and our parts team will confirm the part before you order.
(713) 931-0006Order by Parts Diagram