Separate one weak outlet from a system-wide problem
Uneven spray from one nozzle suggests a different investigation from low pressure across every outlet. Record whether the symptom affects one nozzle, a group or the complete system, together with water level, selected mode and recent changes.
Supply restrictions, air entry, drive conditions and discharge restrictions need different checks. The STG manufacturer example addresses water level, hoses, pump drive and filters and warns against dry operation. Exact speeds and service steps must come from the installed equipment’s manual.
Preserve the symptom before changing the settings
Running harder against poor suction can damage the pump. Do not compensate by raising speed or pressure, bypassing protection or opening a pressurized fitting. Discharge-side inspection belongs after the required isolation and stored-energy controls.
Scroll horizontally to view all columns.
| Decision | What to establish | Condition or limit |
|---|---|---|
| Symptom split | Compare one outlet, one group and all-outlet behavior. | Do not assume every weak pattern has the same cause. |
| Suction side | Check level, valve, priming, filter, hose and air entry. | Running harder against poor suction can damage the pump. |
| Drive and pump | Compare the approved drive condition with the observed response. | Do not raise speed beyond the manufacturer limit. |
| Discharge side | Inspect valves, restrictions, leaks and nozzle condition after isolation. | Never loosen a fitting while pressure or stored energy remains. |
Send the mode comparison to qualified service staff
Provide the system identity, affected outlets and operating observations. Stop for dry running, abnormal heat, noise or vibration, leakage or exposed drive hazards. The service record should identify the cause and the checks completed before return to use.
Information to send with the service request
- Affected mode and onset of the symptom
- Tank level and recent water source
- Pump, PTO or hydraulic operating record
- Filter, hose, valve and nozzle condition
- Available pressure or flow readings and test points
- Recent maintenance, freezing or configuration changes
Records to request and keep
- Complaint and operating-mode record
- Safe isolation and visual inspection checklist
- Before-and-after readings or pattern record
- Identified repair, replacement part and repeat-test result
Common mistakes and what to check instead
- Increasing engine or pump speed first: Find suction, restriction, drive or component faults within approved limits.
- Cleaning nozzles under pressure: Isolate, depressurize and follow the component instructions.
- Replacing the pump without a system check: Verify water supply, valves, filters, hoses and drive condition first.
Service and safety limits
This page is a diagnostic handover structure, not a repair procedure.
Only qualified personnel using the installed manuals should service pressure and drive systems.
Stop use for dry running, cavitation, exposed drive parts, burst risk, leakage, abnormal heat, noise or vibration.
Sources and applicability
Controls the project-input, quotation, approval and inspection workflow described in this guide.
Provides public checklists and worksheets; the signed project documents remain controlling.
Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Manufacturer primary source supporting pump, PTO, water-level, spray-control, hose, leak and pre-start checks. Its model settings do not rate a KEEYAK project.