evolution G-35 H
Service Manual
37/45
Issue 1.9
Ref. NR-00103-ENG
http://www.gamapur.com/
Hydraulic unit
WARNING!
Before resolving any kind of defect, make sure all of the pushbuttons are
off, that the general switch is in shutdown position and that the unit is disconnected from
the power supply. Never handle the inside of the control panel with the unit connected to
the power supply. The hydraulic unit is a component that works under pressure; do not
open any connection or carry out maintenance work on components subject to pressure
until all of the pressures have been completely eliminated.
Follow the recommended procedure in the order indicated, to try to solve the problem and avoid
costly repairs. Make sure all the automatic switches and control elements are in the correct
working position before determining the existence of a fault.
PROBLEMS
SOLUTIONS
The electric motor does not start or stops while it is working.
1
The hydraulic pump fails to develop pressure.
2
Little or no pressure with screeching.
2-3
SOLUTIONS
1.
Automatic Switch
The electric motor is protected by an overload safety switch that triggers when the motor draws
excessive current. Disconnect the machine from the power supply, allow the motor to cool, open
the control panel and reset the automatic switch for the motor. It is important to determine the
reason why the motor has been subject to an overload. Reset one time only or the electric
motor may be damaged due to overheating.
2.
Little or No Pressure
The most likely causes of low or no pressure is usually a deficient supply of the hydraulic fluid to
the pump. This can be caused by incorrect priming, a lack of hydraulic fluid or dirt in the suction
filter. Check the indicated points to guarantee correct operation.
3.
Noise
A noise similar to screeching is a symptom of cavitation. The noise is normal if it occurs when
starting and lasts for approximately thirty seconds.
If the noise continues, stop the machine to protect the hydraulic pump and make sure that the
connectors are tight and that the pump has been correctly primed.
Another possible cause of noises in the pump is excessive temperature in the hydraulic oil.
Make sure the oil supply is correct, and, if necessary, improve the ventilation to allow better
dissipation of the heat in the hydraulic tank.