Larzep HAM5524, Operating And Maintenance Instructions Manual

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6
5. PROBLEMS, MALFUNCTIONS AND SOLUTIONS
5.1 OPERATIONS THAT CAN BE CARRIED OUT BY THE USER
5.1.1 The cylinder or hydraulic tool does not move forward.
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Tank under pressure.
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Replace the transportation plug with the ventilation plug.
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Pump not primed.
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Turn the machine on without activating the remote pendant / with the distributing control set to ‘C’ for a few minutes until
the pump expels the air from the circuit. This operation can be optimised by stopping and starting the motor. As the
pump is gradually primed, the noise made by the machine changes.
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Not enough oil in the tank.
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Check level and refill.
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Pressure regulating valve incorrectly adjusted.
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Readjust the external pressure limiting valve.
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Hose quick plugs not correctly connected.
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Check that all plugs are connected properly.
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Filter dirty.
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Remove the lid and proceed as described in the Maintenance section.
All these operations can be carried out by the user. The operations outlined below, on the other hand, should only be carried out by
specialist personnel, preferably from an authorised technical assistance service.
5.2 OPERATIONS THAT MUST BE CARRIED OUT BY SPECIALIST PERSONNEL
5.2.1 The cylinder or hydraulic tool does not move forward.
First, check that the problem is not due to a malfunction in the cylinder or hydraulic tool.
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Internal safety valve not properly adjusted.
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Readjust or replace (12).
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Pump’s check valve damaged.
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Check ball seats (in pump (5) and internal distributor (13)).
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Pump damaged
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Replace (5).
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Leak in hydraulic circuit
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Check circuit and tighten joints.
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Motor coupling damaged
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Replace (10).
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Electrovalve or manual valve damaged.
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Replace distributing valve (4).
5.2.2 The machine loses pressure when the distributing valve control is set to neutral (position ‘C’).
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Electrovalve check valves damaged.
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Replace the electrovalve (4).
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Electrovalve damaged.
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Replace (4).
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Manual valve check valves damaged.
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Check ball seats (4).
5.2.3 The cylinder or hydraulic tool does not move back.
See point 5.2.1