17
3
Design and Function
7. Trouble Shooting
In case of malfunctions, please check:
Problem:
Possible Cause:
Remedy:
Cylinder does not
advance
• Pump release valve open
• Coupler not fully tightened
• Oil level in pump is low
• Pump malfunctioning or not
switched on *
• Load is too heavy for cylinder
• Hose is damaged
• Hose is bent/kinked
• Pump capacity too low
Close valve
Tighten the coupler and
refill oil
Service / Send pump to manu-
facturer
Use larger type of cylinder
Replace hose
Straighten hose
Use pump with higher capacity
Cylinder advances part
way
• Oil level in pump is low
• Cylinder piston is stuck *
Refill oil
Service
Cylinder advances jerkily • Air in the hydraulic system
• Cylinder piston is stuck *
Bleed system
Service
Cylinder advances but
does not hold - pressuri-
zation not possible
• Cylinder seals leaking *
• Pump malfunctioning *
• Leaking connection
Service
Service
Assure tight connection
Cylinder leaks oil
• Worn or damaged seals *
• Internal cylinder damage *
• Loose connection
Service
Service
Assure tight connection
Cylinder does not retract • Piston rod damaged *
• Pump release valve is closed
• Narrow hose restricts flow
• Retraction spring damaged *
• Internal cylinder damage *
Service
Open valve
Straighten hose, remove narrow
point
Service
Service
* Repair work only through manu-
facturer (Service)
If the malfunctions continue, please get in touch with our Service Center.
Bleeding of the Hydraulic System:
Air may enter the hydraulic system unintentionally. To bleed the system, please proceed as fol-
lows:
1. Hold the cylinder in oblique position with the connection “A” pointing upwards.
2. The pump discharge must be higher than the cylinder and the hose.
3. Fully extend the cylinder and hold it in this position for about 15 minutes.
4. Fully retract the cylinder by opening the pump release valve.
Summary of Contents for 4932-17
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