For sand producers in Indonesia and the Philippines, a VSI crusher (Type V) is the heart of the manufactured sand process. When output drops below 80 tph, it directly impacts profitability. Knowing how to troubleshoot low output from VSI 80 tph helps you quickly identify and fix common issues – from worn rotor tips to incorrect feed parameters. Below we share a systematic approach based on OCP Mechanical Company’s 40 years of experience, with practical solutions that restore production without waiting for external technicians.
1. Inspect Rotor Tips and Feed Tube
The most frequent cause in how to troubleshoot low output from VSI 80 tph is worn tungsten carbide tips. As tips wear beyond 50‑60% of original height, the rotor loses throwing efficiency, reducing throughput by 20‑40%. Inspect the tips every 40‑50 hours. If they are rounded or chipped, replace them as a set. Also check the feed tube – a worn or misaligned tube causes uneven material distribution, leading to partial rotor loading and lower output. Replace the feed tube if internal wear exceeds 50%.
Note: Product data are constantly updated; for the latest specifications of Type V rotor components, please contact our online customer service.
Many sand plants in West Java and Luzon have regained full capacity simply by replacing worn tips and the feed tube.
2. Check Rotor Speed and VFD Settings
Another key step in how to troubleshoot low output from VSI 80 tph is verifying rotor speed. Running too slow (e.g., 1,200 rpm instead of the recommended 1,500‑1,700 rpm for river pebble or andesite) reduces impact energy and throughput. Use a tachometer or check the VFD display. If the speed is correct but output remains low, inspect the VFD for current limiting or parameter drift. Also, ensure the VFD is not in a fault mode that reduces motor torque.
The above values are for illustration only. OCP continuously improves its products. Contact our online team for current speed recommendations.
Operators in Central Java have recovered 20% throughput after correcting a VFD setting that had been inadvertently changed.
3. Evaluate Feed Size, Moisture, and Segregation
Feed issues are a common culprit when troubleshooting low output from VSI 80 tph. Oversize feed (>50 mm) jams the rotor and reduces throughput. Measure the feed size – it should be 10‑40 mm for optimal performance. High moisture (>6%) causes material to stick inside the rotor, reducing centrifugal action. Dry the feed or blend with dry material. Uneven feed (only one side of the rotor) leads to partial loading. Install a vibrating feeder with a spreader chute to ensure even distribution across the rotor width.
In the Philippines, many VSI operators have fixed low output by re‑screening their feed to remove oversize cobbles and pre‑drying stockpiles during the rainy season.
4. Check Screen Blinding and Closed Circuit Efficiency
A VSI in closed circuit with a screen will lose output if the screen is blinded. While troubleshooting low output from VSI 80 tph, inspect the discharge screen. If the 5‑10 mm apertures are clogged with fines, oversize recirculates excessively, reducing net output. Clean or replace screen panels (polyurethane resists blinding better than woven wire). Also, ensure the screen amplitude and slope are correct (8‑10 mm stroke, 18‑22° slope for sand).
OCP’s technical team can remotely guide you through each of these checks via live video. We keep replacement tips, feed tubes, and screen panels in our Jakarta and Manila warehouses for fast delivery.
Why OCP Is Your Partner for VSI Troubleshooting in Southeast Asia
Understanding how to troubleshoot low output from VSI 80 tph keeps your sand plant productive. OCP Mechanical Company has over 40 years of history in VSI technology. We offer:
Free pre‑sale performance diagnostics via video or data logs.
Factory‑direct replacement parts with local stock for fast turnaround.
24/7 online technical support for remote troubleshooting.
For immediate help to troubleshoot low output from VSI 80 tph, simply click the live chat icon on this page. Our online customer service team is available 24 hours a day, 7 days a week, to answer your technical questions, provide free recommendations, and get your VSI back to full capacity.
