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NOTICE: Do not attempt to grasp with pliers or wrench without
first wrapping the jaws of such tool with rags or similar padding.
How to bleed air from system:
1. Place pump at a higher elevation than the hose and cylinder
as shown in Figure 2.
2. Operate pump to fully extend and retract the cylinder 2 or 3 times.
The objective is to force the air bubbles up hill and back to the
pump reservoir.
3. Follow pump instruction manual to bleed the air from pump
reservoir. On most pumps, air can escape by opening the oil
filler plug/screw.
The following information is intended as an aid in determining if problem exists. Cylinders should be repaired only by authorized BVA
Service Center. For repair service, contact service center in your area.
Symptom
Erratic action
Cylinder will not extend, or
respond to pressurized fluid
Cylinder extend only partially
Cylinder move slower than normal
Cylinder responds to pressurized
fluid, but system does not maintain
pressure
Oil leaking from cylinder
Cylinder will not retract or retracts
slower than normal
Cylinder performs poorly
(cont.)
TROUBLESHOOTING GUIDE
Possible Causes
• Air in system or pump cavitation.
• External leakage in cylinder.
• Cylinder sticking or binding.
• Overload condition.
• Loose couplers.
• Faulty couplers.
• Improper valve position.
• Oil level in pump is low.
• Pump not operating.
• Air-locked pump.
• Oil level in pump is low.
• Overload condition.
• Cylinder is sticking or binding.
• Loose connection or coupler.
• Restricted hydraulic line or fitting.
• Pump not working correctly.
• Cylinder seals leaking.
• Overload condition.
• Pump or valve malfunctioning.
• Cylinder seals leaking.
• Worn or damaged seals.
• Improper valve position.
• Malfunctioning coupler, damaged
application.
• Pump reservoir overfilled.
• Cylinder damage internally.
• Oil level in pump is low.
• Air trapped in system.
Figure 2 - Illustration to bleed air from system
• Vent the system (refer to figure 2).
• Contact service center.
• Contact service center.
• 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.
• Fill and bleed the system.
• Remedy overload condition.
• Contact service center.
• Tighten connection or coupler.
• Clean and replace if damaged.
• Check pump's operating instructions.
• Contact service center.
• Remedy overload condition.
• Check pump's operating instructions.
• Contact service center.
• Contact service center.
• Open release valve or change valve position.
• Secure load by other means. Depressurize
pump and hoses, remove application and
replace coupler.
• Secure load by other means. Depressurize
pump and hoses, remove application, then drain
fluid to proper level.
• Contact service center.
• Ensure proper oil level.
• Vent the system (refer to figure 2).
5
Corrective Action
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