Overheating is the No.1 frequent fault of industrial
Screw Air Compressor, especially for factories located in high‑temperature regions: the Middle East, North Africa, and Sub‑Saharan Africa. These areas feature extreme tropical desert climates, with long‑term ambient temperatures above 40°C in summer, peak surface temperatures exceeding 58°C, dry air, and heavy sand dust. Harsh external heat and dusty environments easily cause poor heat dissipation, lubricant failure, and frequent overheating alarms for air compressors, leading to unplanned production downtime and airend damage. The overheating issue is not exclusive to screw models; operators of compact
5hp 3.7kw belt drive Oil Free Scroll Compressor and portable
Mobile Diesel Air Compressor deployed on construction and mining sites also often face similar high-temperature risks under blazing hot ambient conditions. Unaddressed high temperature can lead to lubricant carbonization, airend seizure, unexpected production downtime and costly component replacement. ZAKF releases this official troubleshooting guide to help plant technicians quickly diagnose, isolate and resolve overheating issues on‑site, especially for users in high‑temperature countries and regions.
Critical temperature reference for ZAKF screw compressors: Normal operating temperature should be 80°C‑90°C, when temperature reaches 105°C, the control panel will trigger an alarm, 110°C will force automatic shutdown for machine protection.
For equipment running in Saudi Arabia, UAE, Egypt, Nigeria, Kenya, Algeria and other high‑temperature zones, the compressor baseline heat load is much higher than that in temperate regions. Even normal load operation can push the temperature close to the alarm threshold. Once cooling system efficiency drops slightly, overheating faults will occur immediately. If your unit hits 105 °C alarm or 110 °C emergency shutdown, stop continuous running immediately and follow the step‑by‑step inspection workflow below.
Image A Image B Suggestion: Prepare real‑site photos for reference. : Internal cabinet photo, circle and mark thermostatic valve location on oil circulation piping. : External cabinet photo, circle and mark oil cooler / cooling radiator core assembly.
Step‑by‑Step Overheating Troubleshooting (Step 1‑2‑3)
Step 1: Record controller data & check basic operating conditions
Record real discharge temperature from HMI controller, total running hours, and current ambient temperature (key for Middle East & Africa sites). • Ventilation check: High outdoor temperature in desert regions easily causes hot air recirculation in the compressor room. Confirm no blocked air intake or accumulated hot air; keep room ventilation unobstructed. Ambient temperature must stay below 40°C for stable operation. • Oil level inspection: Check the lubricant sight glass to ensure oil level is between min‑max marks. Low oil level severely reduces heat dissipation capacity and triggers high temperature faults under extreme heat. • Oil quality check: Dark, foamy, or milky oil indicates degradation or water contamination. High ambient heat accelerates oil aging, so deteriorated oil must be replaced immediately.
Step 2: Locate the thermostatic valve (see image A)
The thermostatic valve is the core component regulating lubricant circulation path. It controls whether oil bypasses or flows through the oil cooler according to oil temperature, directly determining the cooling efficiency of the whole machine. Operation steps:
- Power off the machine and completely release residual pressure before inspection to ensure safety.
- Locate the thermostatic valve on the main oil circuit piping (marked in Image A).
- Restart the compressor and let the temperature rise to 80°C‑85°C, then touch the oil pipe leading to the cooler.
- Judgment standard: If the cooler inlet pipe remains cold while the machine temperature keeps rising, the thermostatic valve is stuck closed and fails to switch the oil circuit for cooling. This is the most common overheating cause for compressors running long‑term in high‑temperature regions. Clean or replace the valve cartridge in time. If the pipe heats up normally, the thermostatic valve works properly, proceed to Step 3.
Common failure reminder: Long‑term high‑temperature operation in Middle East and African regions easily produces oil sludge, which blocks the thermostatic valve spool and causes failure.
Step 3: Inspect and clean oil cooler (see image B)
The oil cooler (radiator core, marked in Image B) undertakes the core heat dissipation work. In Middle East and North African industrial sites, frequent sand dust and floating fibers easily block cooling fins, greatly reducing heat exchange efficiency and causing overheating. Operation steps:
- Visually check the cooler fin area (marked in Image B). Dust, sand accumulation, and oily fouling are typical blockage phenomena in high‑temperature and dusty regions.
- Light blockage: Use low‑pressure dry compressed air to blow dust and sand from the fan side.
- Heavy oily blockage: Clean with professional cooling core detergent, rinse thoroughly, and dry completely before restarting the machine.
- Cooling fan inspection: Confirm the cooling fan automatically starts when temperature reaches 85°C. Check for stalling, abnormal noise or insufficient speed. Replace faulty fan motors timely, as fan failure is a major cause of overheating in hot climate areas.
After completing the three steps above, restart the compressor and monitor the operating temperature. If the temperature still exceeds 95°C, check the oil filter, oil separator differential pressure, air filter blockage and temperature sensor calibration. Contact ZAKF technical support for professional diagnosis.
ZAKF Screw Compressor Lubricant & Maintenance Reference Table
For equipment operating in Middle East, Africa and other high‑temperature, dusty harsh environments, the lubricant aging speed is 30%‑50% faster than normal conditions. It is necessary to strictly follow the shortened maintenance cycle below, and do not mix different grades of lubricants.
| Lubricant Type | Application Scenario | Standard Replacement Interval | Special Working Condition |
| ZAKF PAO‑4000 Synthetic Compressor Oil | General‑purpose for ZAKF fixed‑speed / PM‑VSD screw compressors | 4000 operating hours | 3000 h for high‑ambient‑temp (>35 °C) / dusty workshops |
| ZAKF PAO‑6000 Full‑Synthetic Compressor Oil | Heavy‑duty, 24/7 continuous operation | 6000 operating hours | 4500 h for harsh site conditions |
| First‑run oil (new machine break‑in) | New unit commissioning | 500 hours | Strictly follow break‑in cycle regardless of environment |
Supporting maintenance suggestion: Replace the oil filter synchronously when changing lubricant. Replace the oil separator element once differential pressure alarm occurs or the service cycle expires.
Preventive Best Practices for High‑Temperature Regions
Aiming at the extreme high temperature and dusty characteristics of Middle East and African industrial parks, ZAKF summarizes targeted maintenance rules:
- Check the compressor operating temperature daily, track the slow temperature rise trend in advance, and avoid sudden alarm shutdowns.
- Clean the oil cooler and air filter fins every 1‑2 months (shortened from 3 months) to prevent sand and dust accumulation from blocking heat dissipation.
- Strictly implement the shortened oil replacement cycle for high‑temperature environments to prevent oil carbonization and viscosity failure.
- Keep all cabinet panels closed during operation to ensure the internal air duct circulation and avoid increased heat load.
FAQ
Q: Can I continue running the compressor when 105°C high‑temp alarm appears in hot seasons? A: Absolutely not recommended. Continuous operation under alarm status in high‑temperature environments will rapidly accelerate lubricant carbonization, cause airend wear and even seizure, resulting in high maintenance costs and long‑term production shutdowns.
Q: Overheating is fixed after cleaning the cooler, but it recurs after a few weeks? A: This is a common problem in Middle East and African dusty sites. It is necessary to check the air filter clogging degree, confirm whether the thermostatic valve is worn and stuck, and increase the frequency of cooling system cleaning and inspection.
This guide applies to all ZAKF screw air compressor series. Actual component layout varies by model. Please refer to the original official manual. For complex faults in special high‑temperature regions, please contact certified ZAKF regional service technicians.
