SANY concrete pump hydraulic failure is one of the most frequent technical challenges faced by operators. From pressure loss to control issues, understanding the root causes and solutions can save significant downtime and maintenance costs. Below is a breakdown of typical problems, solutions, and real-world case analyses.
Common SANY Concrete Pump Hydraulic Failure Scenarios
Low or No Hydraulic Pressure in SANY Concrete Pump
- Root Causes:
- Relief valve stuck open or spring failure
- Faulty valve spool movement
- Internal or external leakage in hydraulic components
- How to Fix SANY Concrete Pump Hydraulic Failure (Pressure Issues):
- Refit or replace valve components
- Clean clogged damping holes
- Replace damaged seals and inspect pump/valve joints
Inadequate Flow in SANY Hydraulic System
- Likely Causes:
- Low oil level, blocked filters, or overly viscous hydraulic oil
- Severely worn hydraulic pump
- Air entering through return lines or failed accumulators
- Resolution Steps for SANY Concrete Pump Hydraulic Flow Issues:
- Refill with proper viscosity oil
- Clean or replace filters
- Replace worn pumps or recharge accumulators
Leakage in SANY Concrete Pump Hydraulic Components
- Cause Examples:
- Loose fittings, worn-out seals
- Inadequate flange preload
- Overpressure causing seal failure
- Fixing SANY Concrete Pump Oil Leak Problems:
- Tighten joints
- Replace seals
- Adjust pressure settings accordingly
SANY Concrete Pump Hydraulic Failure Due to Overheating
Overheating Symptoms and Causes
- Frequent Causes:
- High system pressure for extended periods
- Leakage or friction leading to power loss
- Fixing SANY Concrete Pump Overheating Issues:
- Adjust relief valve to the recommended pressure
- Improve sealing and lubrication
- Enhance part machining and assembly precision
Diagnosing Vibration and Shock
- Typical Problems:
- Air ingress at suction side
- Incorrect oil viscosity or clogged filters
- Faulty relief valve or spool movement issues
- Fixing Vibrations in SANY Concrete Pump Hydraulic Systems:
- Improve suction height and pipe layout
- Replace worn-out components
- Clean or replace faulty valves
Shock During Operation
- Probable Causes:
- Low accumulator pressure
- Poor damping in direction control valves
- Fix for Hydraulic Shock in SANY Concrete Pumps:
- Recharge accumulator
- Modify damping components or angles
Real-World Cases
Case 1: SANY Boom Arm Rotates Only One Side or Not at All
Pump Model: 2006 SANY 37m
Issue:
The boom arm only rotates to one side under remote control, or does not rotate at all.
Steps to Diagnose and Fix This SANY Concrete Pump Hydraulic Failure:
- Electrical Check:
- Inspect the boom rotation limit switches
- Test solenoids, relays, and control signals
- Hydraulic Check:
- Swap hoses on a multi-way valve
- Examine the rotary balance valve and motor
- Check planetary reducer bearings
Result:
The faulty solenoid coil was identified and replaced to restore function.
Case 2: SANY Pump Arm and Outriggers Not Working in Remote Mode
Pump Model: SY5310-37m Small Displacement
Symptom:
Boom and outriggers do not respond via local or remote control, but pumping is unaffected.
Fixing This Type of SANY Concrete Pump Hydraulic Failure:
- Test voltage on output module Q2.7
- Check and replace the KA30 relay
- Inspect spool movement in bypass and boom arm valves
- Check for a jammed three-way flow valve
Final Diagnosis:
KA30 relay failed. Replacing it resolved the issue.
Case 3: SANY Pump Mixing Function Lacks Pressure and Fails to Adjust
Fault Details:
Mixer becomes weak or stalls after operation; pressure adjustment is ineffective.
Solving Pressure Regulation Hydraulic Failure in SANY Pumps:
- Test mixing pressure adjustment
- Inspect the mixing motor for overheating or noise
- Swap the pump outlet lines to isolate the gear pump function
Outcome:
The gear pump was worn out and replaced, restoring proper mixing functionality.
Conclusion: Preventing and Solving SANY Concrete Pump Hydraulic Failure
Effective resolution of SANY concrete pump hydraulic failure requires a structured approach. Start with electrical diagnostics before proceeding to hydraulic troubleshooting. Regular maintenance, proper lubrication, and operator awareness are crucial to avoid unplanned downtime.
By recognizing the symptoms and understanding these real-world cases, operators and technicians can quickly restore optimal performance to their SANY hydraulic pump systems.
