BVA Hydraulics HLNF20002 - Manual (Page 6)

Symptom Possible Causes Corrective Action
Erratic action
• Air in system or pump cavitation
• External leakage in cylinder
• Cylinder sticking or binding
• Vent the system (refer to figure 2).
• Contact service center.
• Contact service center.
Cylinder will not extend
• Overload condition
• Loose couplers
• Faulty couplers
• Improper valve position
• Oil level in pump is low
• Pump not operating
• Air-locked pump
• Remedy overload condition.
• Tighten couplers.
• Replace both female and male
couplers.
• Close release valve or change valve
position.
• Fill and bleed the system.
• Check pump’s operating instructions.
• Prime pump per pump operating
instructions.
Cylinder extends partially
• Oil level in pump is low
• Overload condition
• Cylinder is sticking or binding
• Fill and bleed the system.
• Remedy overload condition.
• Contact service center.
Cylinder moves slower than normal
• Loose connection or coupler
• Restricted hydraulic line or fitting
• Pump not working correctly
• Cylinder seals leaking
• Tighten connection or coupler.
• Clean and replace if damaged.
• Check pump’s operating instructions.
• Contact service center.
Cylinder responds to pressurized
fluid, but system does not maintain
pressure
• Overload condition
• Pump or valve malfunctioning
• Cylinder seals leaking
• Remedy overload condition.
• Check pump’s operating instructions.
• Contact service center.
Oil leaking from cylinder • Worn or damaged seals • Contact service center.
Cylinder will not retract or retracts
slower than normal
• Improper valve position
• Malfunctioning coupler, damaged
application
• Pump reservoir overfilled
• Cylinder damage internally
• Open release valve or change valve
position.
• Secure load by other means.
Depressurize pump and hoses,
remove from load area, replace
coupler.
• Secure load by other means.
Depressurize pump and hoses,
remove from load area, then drain
fluid to proper level.
• Contact service center.
Poor performance
• Oil level in pump is low
• Air trapped in system
• Ensure proper oil level.
• Vent the system (refer to figure 2).
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