The Hydra M2000 and M4000 share one hydraulic motor diagram, 441-576, and the Pro IV has its own, 441-574. The parts you will order most are the 441-908 spool valve with sleeve, the O-rings and backup rings, the piston seals and wear rings, or one of the two motor service kits, 441-701 (major) and 441-071 (minor).
What the motor does, and which diagram is yours
On every Hydra, a Honda engine drives a hydraulic pump, and a hydraulic motor strokes the piston-type fluid pump that moves your coating. The motor is the part that turns oil pressure into the up-and-down stroke you see on the pump. If the stroke stalls, stutters or loses pressure with the oil side suspected, this is the assembly you are looking at.
The site has two motor diagrams for the older Hydra line. The 441-576 Hydraulic Motor page covers the Hydra M2000 and the Hydra M4000 together. The Hydra Pro IV 441-574 motor page is separate. Many part numbers are printed on both pages, but the callout numbers differ, and a few parts appear on only one of them. Start from the page that carries your model's name.
Where the motor sits on each model's major components page
| Model | Motor diagram | Whole motor pump or motor on the major components page |
|---|---|---|
| Hydra M2000 | 441-576 | 441-315A motor pump assembly (Major Components) |
| Hydra M4000 | 441-576 | 441-246A motor pump (Major Components Parts) |
| Hydra Pro IV | 441-574 | 441-574A hydraulic motor and 441-185A motor pump (Pro IV Major Component Parts) |
Those are complete assemblies. Most repairs start with the individual parts and kits below instead.
Valve and trip parts
The valve end of the motor is the busiest part of the diagram. Titan's Hydra M manual points to this area when it describes motor faults, telling you to inspect the spool valve for scratches and rough movement. Titan does not publish a service interval for any motor part, so you replace on symptoms and inspection, not on a clock.
Valve and trip parts on the 441-576 diagram
The 441-576 page also groups a 441-032A reset assembly at callout 1 with six small parts under callouts 1A to 1F: the reset cap (441-031), reset button (441-041), reset spring (441-029), reset body (441-027), an O-ring (441-030) and the reset pin (441-028). These are listed on the 441-576 page and not on the Pro IV page, which is a good example of why you start from your own model's diagram. The site does not describe what the reset group does, so ask before you order it if you are unsure it is the part you need.
Seals, O-rings and wear rings
The 441-576 diagram lists the seals, rings and wipers around the cylinder, piston and piston tube as separate parts, so a single failed O-ring does not mean buying a whole motor. Match the number to the callout:
Seal and ring parts on the 441-576 diagram
| Callout | Part | Name on the site |
|---|---|---|
| 2 | 441-217 | Synthetic Rubber O-Ring |
| 6 | 141-007 | O-Ring, Synthetic Rubber |
| 10 | 441-149 | Backup Ring |
| 11 | 441-148 | O-Ring |
| 13 | 441-152 | Synthetic Rubber O-Ring |
| 16B | 194-113 | Synthetic Rubber O-ring |
| 20 | 441-238 | Wear Ring |
| 22 | 441-249 | U-Cup Piston Seal |
| 23 | 441-026 | O-Ring |
| 24 | 441-024 | Backup Ring |
| 25A | 441-931A | Piston Tube Assembly, packaged |
| 31 | 441-234 | Piston Tube Seal |
| 32 | 445-237 | Wear Ring |
| 33 | 441-025 | Piston Tube Wiper |
| 35A | 432-611 | O-ring / Back-up Ring Set |
Callout numbers are from the 441-576 page. The Pro IV 441-574 page lists most of the same numbers under different callouts.
Cylinder, piston and body parts
The larger parts on the diagram are the ones you buy only when inspection shows damage to the part itself: the 441-312 hydraulic cylinder (callout 28), the 441-916 cylinder head (15), the 442-978 integral piston (21), the 441-932 piston rod assembly (25), the 441-945 motor base (30) and the 441-015 stanchion (14). The Pro IV page adds a 235-030 cylinder head plug that the 441-576 page does not list. Fittings such as the 432-640 elbow, the 441-017 tee and the 441-789 tube are listed too, near the oil connections.
What the manual says about motor symptoms
Titan's Hydra M manual lists three motor faults you can recognize by how the pump moves:
- The motor stalls at the bottom or top of the stroke without unusual heat.
- Low pressure with a sluggish upstroke and high heat.
- Low pressure on both strokes with high heat.
In the same motor section the manual tells you to inspect the spool valve for scratches and rough movement. It also describes purging trapped air by cycling the sprayer at low pressure for 5 to 10 minutes. This guide does not map each symptom to a single part number, so use the manual's own list as the authority. Work through your manual's table in order, because it also covers the cheaper causes (a worn tip, a loaded filter) that can look like a motor problem.
Titan's manuals also say the hydraulic pump on the Hydra M and Pro IV is not field-serviceable and should go back to Titan. The motor parts on this page are a different assembly, but the same rule applies to rebuild steps: use the manual, because the site's diagram shows what to order, not how to fit it.
Motor service kits: 441-701 and 441-071
The site lists two motor kits. Both appear on the Hydra M accessories pages (including M4000 Accessories):
- 441-701, Major Motor Service Kit. The listing's fitment note names Hydra M and Hydra Pro 2000/4000.
- 441-071, Minor Motor Service Kit. The listing's fitment note reads Hydra M and Hydra Pro series.
Titan does not publish a parts list for either kit on the pages we draw from, so we will not guess at what is inside. Call (713) 931-0006 and ask which seals and rings the kit covers, then compare that with the table above. If your list is one or two O-rings, buying those singles is usually the smaller order. If the manual's fault list and your inspection point to several seals at once, a kit is the simpler way to cover them in one go.
Order by the diagram
Identify the model
Hydra M2000 or M4000 use the 441-576 page. Hydra Pro IV uses the 441-574 page. The model plate and your manual settle which one you have.
Open that motor page and find the callout
Use the callout number to pick the exact part, then read the part number next to it. Do not rely on a name alone: this diagram lists two wear rings (441-238 and 445-237), two backup rings (441-149 and 441-024) and two coupling nuts (431-007 and 441-007).
Decide single part or kit
One failed seal is a single-part order. Several failed seals or a worn spool valve point to the kit conversation on the phone.
Call when fitment is unclear
Have the model and serial number ready at (713) 931-0006. Manuals for the rebuild procedure are on our manuals page.
Common orders from the 441-576 motor diagram:
The Short Version
Check your model first: the M2000 and M4000 use the 441-576 motor diagram and the Pro IV uses 441-574. Spool valve 441-908 is the part Titan's manual tells you to inspect, the O-rings, backup rings and piston seals are single parts, and the 441-701 and 441-071 kits are there when several are due. Confirm kit contents by phone.
Not sure which motor 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