The Maxum II manual lists these causes. Little or no flow: dried paint in the nozzle, no air, or a plugged check valve. Leaking: wrong needle or nozzle size, damaged parts, or a loose packing nut. Pulsing: loose or damaged packing. Spitting: a check valve that is not working, material that is too thick, or a projector set that is too small.
How to use the table
The causes below come from the Maxum II operating manual. The Maxum Elite has its own manual, so Elite owners should read that as well. Both guns share many wear parts, and Elite part numbers are on the Maxum Elite parts list. Work from the top of each list down: the first items are things you can check without buying anything.
Maxum symptoms, manual causes and the part to check
| Symptom | Causes the manual lists | Part to check or order |
|---|---|---|
| Little or no flow | Dried paint in the nozzle, no air, plugged check valve | 0276248 check valve assembly; 0297051 repair kit |
| Leaking | Wrong needle or nozzle size, damaged parts, loose packing nut | 0275579 needle packing |
| Pulsing | Loose or damaged packing | 0275579 needle packing |
| Spitting | Check valve not working, material too thick, projector set too small | 0276248; a larger projector set |
| Poor pattern | Clogged air holes or nozzle, damaged needle or nozzle | Clean first; then needle and nozzle (projector set) |
| Heavy centre | Too much fluid pressure | Adjustment, not a part |
| Overspray | Air pressure too high, material too thin, gun too far from the surface | Adjustment, not a part |
Causes are as the Maxum II manual lists them. The part column is our suggestion of where to look on the diagram.
Little or no paint flow
Start with the nozzle. Dried paint is the first cause the manual gives, and it costs nothing to check, so take the needle, nozzle and air cap apart and clean them. Never use a metal pick on the nozzle or air cap; the manual says not to.
Next, confirm there is air at the gun, because the manual lists no air as a cause. If both are fine, suspect a plugged check valve. Take it apart, clean and dry it, and check the seal went back stem up with the arrow toward the gun, as the manual describes. If it is damaged or will not clear, 0276248 is the check valve assembly and 0297051 is the repair kit.
Leaking paint
The manual's causes are the wrong needle or nozzle size, damaged parts, and a loose packing nut. Check that the needle and nozzle in the gun belong together as a projector set before you adjust anything. Then look at the packing nut: the manual says to tighten it with a 3/8 inch wrench until the needle stays retracted, then loosen it until the needle moves freely. If tightening does not stop the leak, the packing is damaged: needle packing is 0275579, which appears on the Maxum II and Maxum Elite diagrams with different callout numbers.
Pulsing and spitting
These two sound alike and have different causes in the manual. Pulsing points to loose or damaged packing, so use the same packing nut check and the same 0275579 part as for leaks. Spitting has three causes: a check valve that is not working, material that is too thick, or a projector set that is too small.
The manual gives no thinning ratio, and we do not either: the coating maker's instructions say how far a coating can be thinned. If the material is not too thick, a set that is too small is the remaining suspect, and the fix is the next larger projector set. Sets on the site include the 0276227 and 0276229.
Poor pattern and overspray
A poor pattern points first at clogged air holes or a clogged nozzle, then at a damaged needle or nozzle. Clean the air cap holes and nozzle without metal tools, then test again. A damaged needle or nozzle is a replacement item, ordered as part of a projector set or as the individual needle, nozzle and air cap listed on our diagrams.
Two symptoms are about setup, not parts. A heavy centre to the pattern means too much fluid pressure. Overspray means air pressure is too high, the material is too thin, or the gun is too far from the surface. Neither needs a part, and the manual gives no air or fluid pressure numbers for them, so we do not either.
When to order parts
- Needle packing 0275579 and the check valve 0276248 are the two most likely parts from this table.
- 0297052 cup gasket kit; the manual says to replace the gasket periodically.
- 0277943 Maxum II gun repair kit and 0279942 maintenance kit if several wear parts are due at once. The 0279942 kit contains needle packing, a replacement check valve assembly, 6 check valve seals and a cup gasket, among other items, according to Titan.
- Cup parts are on the Cup Assembly (P/N 0524271A) page, and the Maxum II guns each have their own diagram, such as the Turbine Cup Gun.
Parts and kits for the problems above:
The Short Version
Clean the nozzle and check the air first, then look at the check valve for flow problems and spitting, and the needle packing for leaks and pulsing. Heavy centre and overspray are set-up problems, not parts.
Not sure which part your symptom points to?
Call (713) 931-0006 with the gun model and what it is doing and our parts team will help you narrow it down.
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