Practical Guide
Gema 15 Hose Connection Ø 9–10 mm on the OptiSelect GM03: Choose Correctly, Mount Cleanly, Coat Stably
If the hose connection doesn't fit exactly, "creeping" problems often arise: erratic powder feed, clogged transitions, or unnecessary wear during quick changeovers. In this guide, you will find practical reference values, a reliable replacement workflow, and suitable spare parts/variants for the OptiSelect GM03 – so that the quick-release truly stays quick.
Why the "Right" Hose Connection is So Important
- The GM03 is designed for a fast connection (Powder hose quick release connection) – this only works cleanly if the diameter and seals are correct.
- The Ø 9–10 mm connection is designated as a wear-relevant part (Wearing Part) – regular checks pay off.
- A tight, smooth transition point reduces the risk of deposits/clogging in the feed path – especially during color changes.
Product Overview: Variants & Applications (OptiSelect GM03)
| Component / Variant | Purpose? | Note | Recommendation |
|---|---|---|---|
|
Gema 15 Hose Connection Ø 9–10 mm Complete incl. Pos. 15.1 |
For powder/hose inner diameter Ø 9–10 mm on the GM03 connection. | Marked as a wear part – check seal/O-ring. | If you work with 10 mm ID and a clean fit without play is required. |
|
Gema 15 Hose Connection Ø 11–12 mm Complete incl. Pos. 15.1 |
Alternative for hose inner diameter Ø 11–12 mm. | Also a wear part – choose correctly, otherwise deposits/leaks may occur. | If your setup is designed for an 11 mm/12 mm feed path. |
| Gema 14 Clip Ring | Securing/locking in the connection area. | For frequent changeovers: check fit & tension force. | Order if the ring is visibly fatigued or no longer holds securely. |
Practical Note: For the Ø 9–10 mm connection, the O-ring (Pos. 15.1) is explicitly listed as a separate spare part – do not "experiment" if leaks occur; replace the seal specifically.
KPI 1
Quick Change
The GM03 is designed for fast coupling/uncoupling – perfect for color changes & service.
KPI 2
Less Downtime
Matching Ø + intact seal reduces clogging and rework.
KPI 3
Stable Application
Constant powder feed + correctly set air values ensure reproducible coating thickness.
Pro Tip
When changing the hose connection: consistently use oil-free, water-free compressed air for blowing out/cleaning – this is explicitly required for the GM03. This prevents oil/water components from causing powder to clump and later causing "mysterious" feeding problems.
CTA: Order Matching Parts Directly
For a quick cart – max. 3 buttons, matching the common variants:
Recommended Basic Settings (Reference Values)
The following values are intended as guidelines for a stable start (adjust according to powder, geometry, grounding, and target coating thickness):
| Parameter | Reference Value | Why this helps |
|---|---|---|
| Powder output | 50% (Start/Initial operation) | Good starting point; the controller automatically keeps the air volume constant. |
| Powder rate (Factory recommendation) | 60% | Baseline value from which you optimize for target coating thickness. |
| Total air volume | 4 Nm³/h | Stabilizes the powder cloud; too little air typically leads to a cloud that is "too dense." |
| Electrode rinsing air (depending on nozzle) | approx. 0.1 to 0.5 Nm³/h | Reduces build-up/sintering on the electrode or deflector plate; "too much" can negatively affect the cloud. |
Important: Compressed air must be oil- and water-free – this is a central requirement for connection and cleaning.
Pro Workflow: Changing Hose Connection & Stable Starting (5–7 steps)
- Bring system to a safe state: Stop coating, turn off the control unit; close main compressed air supply as needed.
- Clean the transition: Blow out the connection area and hose end with oil-/water-free compressed air (no damp cloths, no "compressor condensate").
- Check Clip Ring & O-ring: Visually inspect the clip ring (fit/tension) and O-ring Pos. 15.1 – replace if there are notches or crushing.
- Mount correct variant: Choose Ø 9–10 mm or Ø 11–12 mm to match the hose inner diameter and insert cleanly (without tilting).
- Bundle hose & lines: Route cables/hoses orderly (small kinks are frequent causes of unstable feeding).
- Set reference values: Start with 50% powder volume; set total air as a base and electrode rinsing air according to the nozzle (see table for reference values).
- Verify cloud & application: Spray into the booth and visually check powder output; then fine-tune instead of running "too much powder."
Troubleshooting: 4 Typical Problems (with Actions)
1) H11 / Help Code on Control Unit
- Gun not connected → Check plug/connection and connect correctly.
- Cable/plug or remote control defective → Contact service/manufacturer.
2) Powder Does Not Adhere (Despite Triggering)
- High voltage/current deactivated → Check HV setting.
- Workpiece not properly grounded → Check grounding (most common practical issue).
- HV cascade defective → Service.
3) Gun Does Not Spray Powder (Unit On, Trigger Pressed)
- No compressed air available → Establish compressed air supply.
- Clogging at injector/nozzle/hose/gun → Clean the affected area.
- Injector insert sleeve clogged/worn → Clean or replace.
4) Poor Spray Pattern / Erratic Profile
- Total air incorrectly set → Adjust powder volume and/or total air on the control unit.
- Kinks/damage to air lines to the injector → Check lines.
- Insert sleeve missing/worn → Insert correctly or replace.
Maintenance That Really Helps (5 Points)
- Daily: Blow off the outside of the gun, wipe down, keep clean.
- Weekly: Remove powder hose; remove nozzle and clean with compressed air; blow out gun in direction of flow; clean tube with brush if necessary; clean powder hose separately; reassemble everything.
- Nozzle: Clean inside/outside with compressed air – never immerse in solvents.
- Monthly: Check nozzle for wear (spray pattern/erosion) and replace if necessary.
- Important: Only use approved cleaners for cleaning – certain solvents are explicitly prohibited.
FAQ (Practical)
1) How do I recognize that the Ø 9–10 mm connection is "wrong"?
Typical signs are play at the transition, recurring deposits, or unstable feeding. This means the inner diameter doesn't fit properly or the seal (Pos. 15.1) is worn.
2) Do I always have to replace the O-ring when changing?
Not necessarily – but as soon as crushing, notches, or leaks are visible, a replacement is recommended because the O-ring is listed as its own wear part.
3) Which reference values help during the first start after modification?
Proven reference values: 50% powder volume (initial operation), along with a stable total air level and electrode rinsing air suitable for the nozzle. Then fine-tune (do not increase powder unnecessarily).
4) Why is electrode rinsing air important at all?
It prevents powder from sticking to the electrode/deflector plate. The GM03 describes nozzle-dependent reference values for this – too little encourages build-up, too much can worsen the spray pattern.
5) What is the fastest check if suddenly no powder comes out?
First check the compressed air supply, then look for blockages (injector/nozzle/hose/gun). If the insert sleeve is clogged/worn, clean or replace it.
Conclusion
The Ø 9–10 mm hose connection is a small part with a big impact: if the diameter, clip ring, and seal fit cleanly, the powder feed runs stably – and you truly take advantage of the OptiSelect GM03 quick-release. With the reference values for powder/air, a clear replacement workflow, and consistent cleaning, you reduce downtime, troubleshooting, and unnecessary wear.
Note: All setting values are to be understood as guidelines and must be adapted to the powder type, component geometry, grounding, and target coating thickness.
