Mini Dredge for Sale searches often prioritize pump capacity, but the most common project failures happen before the machine even touches the water. Contractors frequently purchase a powerful river dredging robot, only to discover it cannot fit through the access manhole, or they lack the crane capacity to lower it. Therefore, to avoid a costly mistake, you must conduct a thorough physical site survey before signing any purchase order. This article outlines the three most critical dimensions you must measure before evaluating any dredging robot. To confirm a machine will fit your site, send us site photos or videos, and our engineers will simulate the deployment path for you.
TL;DR: A highly capable dredging machine is useless if it cannot physically enter your facility. Before purchasing, you must accurately measure the manhole dimensions against the machine width (e.g., 500mm to 1200mm), confirm the available lifting capacity for weights between 320kg and 500kg, and assess the tank floor slope. Never buy equipment without a site survey.
| Model | YG-500 | YG-600 | YG-700 | YG-800 | YG-900 | YG-1200 |
| Robot dimensions | 1500*500*650mm | 1500*600*650mm | 1600*700*650mm | 1600*850*700mm | 1650*960*750mm | 1900*1200*750mm |
| Dredging width | 500mm | 600mm | 700mm | 800mm | 900mm | 1200mm |
| Track travel speed | 3-15m/s | 3-15m/s | 3-15m/s | 3-15m/s | 3-15m/s | 3-15m/s |
| Robot weight | 320kg | 350kg | 380kg | 400kg | 420kg | 500kg |
| Pump output diameter | 3inch | 3inch | 4inch | 4inch | 4inch | 4inch |
| Pump flow rate(cubic meters/ hour) | 100 m³ | 100m³ | 200m³ | 200m³ | 200m³ | 200m³ |
| Hydraulic station dimensions(mm) | 2200*1200*1700 | 2200*1200*1700 | 2200*1200*1700 | 2200*1200*1700 | 2200*1200*1700 | 2120*1240*1200 |
| Main motor power | 22kw | 22kw | 30kw | 30kw | 30kw | 45kw |
| Hydraulic system pressure | 0-16Mpa | |||||
| Particle size | 15mm | 15mm | 38mm | 38mm | 38mm | 60mm |
| Reeling system speed | 0-10r/min | |||||
| Hydraulic hoses | 50m (Standard configuration) | |||||
| Control system | Wireless remote control | |||||
| Lighting system | Underwater LED lights *2 | |||||
Checking 1: The Manhole Dilemma for a River Dredging Robot
The first physical barrier is the access point. A standard DN600 manhole has an inner diameter of approximately 600mm. If your machine is wider than the hole, it stays on the truck.
Matching Machine Width to Access Size
Our mini dredge models for sale range from 500mm to 1200mm in width. If your facility uses standard restricted access points, you must select a model like the YG-500, which features a 500mm width to pass through easily. Consequently, if you buy a larger 1200mm model for its higher capacity without checking the entrance, you will face a severe operational bottleneck.
The Turning Radius inside the Tank
Passing through the manhole is only half the battle. Once inside, the machine needs space to turn and maneuver. Furthermore, you must confirm the internal dimensions of the tank, as pipes or structural columns can block the machine’s path.
Checking 2: Lifting Capacity Constraints for an Underwater Dredging Robot
Once you confirm the machine fits through the hole, you must figure out how to get it down there safely.
Dry Weight vs. Wet Extraction
Our machine weights range from 320kg to 500kg depending on the model. However, this is the dry weight. When the machine is filled with mud or if it gets stuck in dense sediment, the extraction weight increases significantly.
Safe Lowering Procedures
Never rely on manual ropes for lowering heavy equipment. Therefore, ensure your site has a crane, a gantry, or a tripod system capable of safely lifting the maximum weight. If there are pipes crossing the manhole, the machine cannot be lowered straight down, requiring specialized rigging.
Checking 3: Tank Floor Topography and Track Traction
The inside of a pump station or industrial tank is rarely perfectly flat. It usually features slopes leading to a collection pit.
Track Stability on Inclines
Our equipment uses a crawler chassis designed for stable movement on muddy surfaces, operating at a track travel speed of 3-15m/s. However, if the concrete slope is extremely steep or lacks traction, the tracks may slip. You must confirm the floor gradient before finalizing your mini dredge for sale order.
Debris and Obstructions
Industrial sumps often contain debris like rebar or plastic that can block the path. The machine needs a clear sub-surface route to reach the farthest corner. If the path is blocked, the dredging width is irrelevant.
What to Confirm with Our Technical Team Before Buying
Before you commit to any mini dredge for sale, conduct a physical survey of your site and send the data to our team:
- The Entry Point. What is the exact inner diameter of the manhole? Are there any pipes blocking the vertical drop?
- The Lifting Plan. What is the safe working load (SWL) of your crane or lifting tripod?
- The Tank Layout. Send us a video showing the slope, the bottom surface, and any obstacles inside the tank.
Send us these three inputs, and our engineers will confirm the suitable model or recommend a customized design.
Customer FAQ About River Dredging Robot Deployment
A: Our standard models are designed for quick deployment, but disassembling the main chassis is not recommended for routine cleaning. If your access is more limited than 500mm, contact our engineering team to discuss custom frame options.
A: You must account for the empty machine weight (up to 500kg) plus the weight of the hose bundle and the mud suction force. Always ensure your lifting equipment has a safe working load that exceeds the total estimated weight by at least 20%.
A: If the slope exceeds the mini dredge for sale’s climbing capability, it may slide. In such cases, our engineers can discuss alternative operational methods, such as anchoring techniques or using a different track profile.
A: Yes. We provide English operation manuals and remote video technical guidance. For complex deployments, our engineers can assist your crew remotely during the first lowering and operation.
Factory Support & CTA
Our factory provides expert site assessments for every project. We do not want you to buy a machine that cannot enter your facility.
Send us a short video of your manhole and tank interior. Our engineers will review the constraints and confirm the exact underwater dredging robot model that can safely navigate your site.
