Clean & Maintain Your DeVilbiss Pro Lite Correctly: The Complete Guide
Regular and proper cleaning and maintenance are key to ensuring long service life and flawless function of your DeVilbiss GTI Pro Lite spray gun. In this detailed guide, we show you step-by-step how to clean the air valve, replace seals, service the nozzle, and fix common problem areas.
The Pro Lite's well-designed modular system enables easy maintenance.
⚠️ SAFETY FIRST: Before any maintenance or cleaning, shut off the air supply and release the pressure from the system! Wear safety glasses and gloves.
What You Need for Maintenance
Prepare the following tools and materials to work efficiently:
- Torx T20 key
- 10 mm / 14 mm open-end wrench
- Cleaning brush
- 6 mm hex key
- Torque wrench
- Soft brush
- Cleaning solution
- Lint-free cloths
- Replacement seals*
* Replacement parts such as seals, nozzles, and needles can be found in official repair kits (e.g., PRO-470).
Step 1: Daily Cleaning After Use
This basic cleaning should be carried out immediately after spraying to prevent material residues from drying.
- Empty & pre-clean the cup: Empty remaining material from the cup. Rinse cup, filter, and lid with suitable solvent.
- Flush the spray gun: Fill a small amount of cleaning solution into the empty cup, attach it, and spray through the gun until clear solution comes out.
- External cleaning: Wipe the outside of the gun and cup with a moistened cloth. Never rub dry (static danger!).
- Clean air cap & nozzle: Remove the air cap. Carefully clean the holes with a soft brush (e.g., the supplied brush) or a wooden stick. Do not use metal objects!
- Dry & store: Allow all parts to air-dry and store the gun safely.
Step 2: Clean or Replace the Air Valve (if losing air)
If the gun is losing air or the trigger becomes stiff, the air valve should be serviced.
| Task | Notes & Reference |
|---|---|
| 1. Remove trigger | Loosen trigger screw (38) with Torx T20. Remove trigger pin (40) and trigger (39). |
| 2. Remove fluid needle | Remove fluid adjusting knob (28) and spring (29). Carefully pull out the fluid needle (24). |
| 3. Loosen valve housing | Unscrew valve housing (27) with 6 mm hex key. |
| 4. Replace valve seat & seals | Use the service tool (53) to remove valve seat (19) and the front (18) and rear (22) seals. Replace with new ones. Ensure correct orientation (groove facing outward). |
| 5. Reassemble | Reinstall parts in reverse order. After assembly, pull the trigger several times to check functionality. |
Original Spare Parts for Your DeVilbiss Pro Lite
Ensure longevity of your gun with original spare parts and repair kits. All seals, nozzles, and valves are perfectly matched.
Find spare parts & accessories at beschicht.comStep 3: Replace Needle Packing (if material leakage)
If material leaks at the needle packing (at the needle/thread transition), the packing is worn out.
- Remove trigger and fluid needle as described in Step 2.
- Loosen and remove packing nut (36) with a flat-head screwdriver.
- Remove and discard old packing (34) and spring (35).
- Insert new packing and spring, tighten nut by hand and then firmly.
The packing set (SN-404-K) includes packing, spring, and nut.
Step 4: Replace Spray Head Seal
This seal (10) sits between the gun body and spray head. Replacement is advisable in case of leaks in the nozzle area or as part of a major overhaul.
- Remove air cap and retaining ring (6).
- Remove fluid needle (24) and fluid nozzle (8) using the 10 mm wrench.
- Remove spray head (9) and old seal (10).
- Clean gun front and all parts.
- Insert new seal, aligning its flat side with the flat surface in the gun body.
- Position spray head so that the pin engages the hole in the housing.
- Tighten fluid nozzle with torque: 18–20 Nm (160–180 in-lbs) using a torque wrench. Do not overtighten!
Maintenance Intervals & Checklist
Observe these guidelines for proactive maintenance:
| Task | Interval / Trigger | Spare Part (Example) |
|---|---|---|
| External cleaning & air cap cleaning | After each use | - |
| Flush fluid channels | After each material change / end of day | Cleaning solution |
| Check/replace fluid nozzle & needle | If spray pattern degrades, leakage occurs, or every 6–12 months (depending on use) | Nozzle set (e.g., PRO-200-13-K + PRO-301-K) |
| Check needle packing | If material leaks at packing nut | Packing set SN-404-K |
| Complete overhaul | Annually or after approx. 500 operating hours | Repair kit PRO-470 |
Conclusion
Regular and proper maintenance of your DeVilbiss Pro Lite spray gun is not complicated science but, with the right knowledge and original spare parts, an easily manageable process. By following the steps described here—from daily cleaning to targeted replacement of wear parts—you not only ensure consistent spray performance and excellent results but also significantly extend the lifespan of your valuable tool. Invest in maintenance to enjoy your spray gun for a long time.
