Automatic mortar jetting machines are advanced construction tools designed to spray a wide range of mortars and coatings efficiently, including cement mortar, putty, plaster, and various water-based materials. Proper operation and maintenance of these machines are essential for achieving optimal spraying results, extending service life, and ensuring workplace safety.
This guide, introduced by China Coal Group, outlines the step-by-step operation process and key precautions for using automatic mortar jetting machines effectively.
Pre-Startup Lubrication
Before starting, press the manual oil pump several times to lubricate the transmission components thoroughly.
Check Motor Rotation Direction
After turning on the power, inspect the main motor to ensure the rubber spiral rotates in the correct direction. If not, adjust the power supply phase. This step must be performed every time the machine is reconnected to power.
Initial Flushing
Connect the feed hose and nozzle, add 5 liters of clean water to the hopper, start the motor, and flush the pump system. Wet the hopper, pump body, and conveying hose, then stop the pump after most water has passed through.
Loading Mortar and Spraying
Once the mortar is added to the hopper, activate the air compressor and open the air valve to begin spraying.
Avoid Idle Operation
Never operate automatic mortar jetting machines with an empty hopper or without water, as this may damage the internal components.
Post-Work Cleaning
After each use, drain the remaining material from the hopper. Fill it with fresh water and run the pump to flush out the hopper, hoses, and nozzle until clean water flows freely. This prevents leftover mortar from solidifying and blocking the system.
Long Downtime Storage
For extended inactivity, clean the machine thoroughly, remove the booster screw, lubricate it, and store it properly before reinstalling.
Pressure Adjustment
If insufficient pressure occurs during operation, adjust the booster stator bolts or replace the pressurized rubber sleeves and booster worms.
Pre-Spraying Surface Preparation
Ensure the wall is slightly moistened before spraying. Keep the nozzle vertical to the spraying surface and adjust the distance as needed for even coverage. Coordinate with the leveling process for best results.
Consistent Material Feeding
Feed the hopper evenly and avoid interruptions. Never insert foreign objects (e.g., sticks) into the hopper while the conveyor screw is rotating to prevent injury.
Clearing Blockages
If the spray pipe becomes blocked, switch to manual mode, run only the compressor, remove the quick connector near the pump head, point the nozzle downward, and allow air pressure to reverse-flush the blockage.
Mandatory Safety Gear
Always wear helmets, protective glasses, gloves, and proper work attire during operation.
Maintenance of Wear Parts
The pressurized rubber sleeve and booster screw are wear-prone components. Initially, keep the booster stator bolts slightly loose. If pressure and flow decrease over time, tighten them gradually to restore performance.
Automatic mortar jetting machines are widely used in:
Interior wall plastering for painting or wallpaper preparation
Exterior wall finishing with cement-based or decorative coatings
Waterproofing bathrooms, kitchens, and basements
Fireproof and thermal insulation spraying in commercial buildings
High-efficiency skim coating for large-scale renovation projects
Their ability to deliver uniform, high-pressure spraying improves material adhesion, reduces labor intensity, and accelerates construction timelines—making them indispensable in both residential and commercial sectors.
For construction companies seeking to improve project quality and efficiency, adopting automatic mortar jetting machines is a cost-effective solution. By following the correct operating procedures and performing regular maintenance, you can maximize their service life, minimize downtime, and achieve superior wall finishing results.
These machines not only save labor costs but also ensure consistent application quality—helping construction enterprises remain competitive in today’s fast-paced market.
