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The YB series ceramic plunger mud pumps are hydraulically driven, double-rod, double-acting positive displacement pumps. They feature stable and reliable operation, high output pressure with accurate metering, low pressure fluctuations, low noise, compact size and light weight, easy operation and maintenance, as well as a long service life. It is mainly used to supply slurry to various types of spray dryers and filter presses, and can also be used for the long-distance transportation of mud, clean (or polluted) water, coal slurry, and other suspensions. The YB series of hydraulic ceramic piston pumps comes in four major series with nearly twenty different models, offering flow rates ranging from 0.3 cubic meters per hour to 120 cubic meters per hour. The maximum pressure of the atmospheric pressure pump can reach 2.5 MPa, with a rated pressure of 2.0 MPa. The maximum pressure of the high-pressure pump can reach 5 MPa, with a rated pressure of 3.0 MPa. The low-pressure pump operates at 1.5 MPa, with a flow rate that is 10–20% higher than that of pumps of the same type. The YB200 plunger mud pump, when used in conjunction with a filter press, can replace 3–4 traditional diaphragm pumps; this reduces the required floor space and also lowers costs for maintenance and electricity consumption for the user. It is the preferred product for users’ technical upgrades. If proper maintenance is not carried out during use, minor malfunctions are inevitable. The following are the methods for troubleshooting common faults in plunger mud pumps: Common faults of plunger mud pumps and their solutions. Possible causes of faults – Solutions: 1. Abnormal pressure in the hydraulic system or excessive noise from the oil pump, resulting in insufficient mud pressure. (1) Clogged filter. (2) Low oil level in the tank, preventing the oil pump from drawing in oil. (3) Severe wear and leakage in the oil pump. (4) The relief valve is damaged. (5) Severe oil leakage in the hydraulic system (broken oil pipes) ； The seals of the hydraulic components are excessively worn or aged). (6) High viscosity of the hydraulic oil prevents it from flowing in, or low viscosity leads to severe leakage. (1) Replace the filter or the oil used for filtering. (2) Refill the oil. (3) Replace the oil pump. (4) Replace the relief valve. (5) Inspect and resolve the issue. (6) Replace it with hydraulic oil of appropriate performance. 2. Failures in the mud system result in insufficient displacement and an inability to achieve high pressure. Or the working pressures of the two cylinders are not equal, resulting in large pressure fluctuations. (7) The slurry suction pipe is exposed above the slurry surface. (8) Clogging of the slurry suction pipe. (9) The suction tube is leaking air. (10) The slurry feed valve is not functioning properly; the gap between sleeve 25 and guide rod 24 is too small, preventing smooth upward and downward movement ； The gap is not tight enough ； The valve disc 28 is cracked. (11) The gasket 28 is scratched by iron shavings; these particles act as a barrier that prevents the mud from sealing properly. (12) The sealing ring 19 is worn out. (13) Deep grooves appear due to plunger wear. (7) Add mud. (8) Flush the pipes. (9) Check the connections and fix any issues. (10) Inspection and replacement. (11) Replace the gasket. (12) The sealing ring 19 is worn out. (13) Deep grooves appear due to plunger wear. (12) Press the sealing ring tightly. (l3) If grout still leaks despite using a compression seal ring, replace the plunger. 3. The mud pressure fluctuates greatly; the pressure in a single cylinder cannot be increased. (14) There is little air in the air tank. (15) There is little air in the air tank. (16) Excessive sediment at the bottom of the air tank reduces its volume. (14) Handle it as described in (10), (11), and (12) above. (15) Stop the pump, open the valve below the air tank to release slurry, and then refill air automatically. (16) Remove the pressure gauge connector at the top of the air tank and wash the air tank with pressurized water. 4. The hydraulic system wears out too quickly during use. (20) The oil is too dirty. (21) The oil filter is failed or has fallen off. (22) The oil viscosity is too low. (23) Oil temperature (low amount of cooling water, scaling in the cooling water pipes, or scaling in the cooler). (20) Oil change. (21) Inspect, repair, or replace. (22) Switch to an oil of a higher grade. (23) Increase the cooling water volume, flush the water pipes, or replace the cooler. (When shutting down the pump, it is necessary to turn off the machine first and then the water supply; otherwise, mud will flow into the cooler and cause blockages.) 5. The ceramic plunger moves upward axially (24); the nut that holds the plunger in place is loose (24) – tighten the nut that holds the plunger in place. 6. The ceramic plunger breaks (25); the loose nut causes the plunger to collide with other components (26); the sealing ring is tightened too much, no cooling water flows, the plunger heats up, and it ruptures when cooled. (25) Replace the plunger. (26) Replace the plunger; do not tighten the pressure ring too much