MP sava3 - Descent Malfunctions; Descent Start-up Issues; Descent Nominal Speed Issues; Speed Slower Than Usual

MP sava3 Hidraulic Power Unit 1 ¼” 1 ½”
V700 - 11/2017
31/40
MTMECMPsava3_700_EN
A3. Descent
A3.1. Start-up (the lift does not start)
- Descent electrovalve (YD).
- The coil is not being supplied correctly  Check the connection in the connector and in the control panel terminal.
A3.2. Nominal speed
A3.2.1. Speed slower than usual
- Speed change electrovalve (YR)
- The coil is not being supplied correctly  Check the connection in the connector and in the control panel terminal.
- The electrovalve actuator is blocked  the oil returns to the tank via the YR electrovalve sheath.
Clean any possible shavings or impurities.
Place the ball catch on the mechanized cone at the base of the electrovalve.
- Speed of descent regulator (screw nº 5)
- The screw may be excessively untightened  Turn the regulator, tightening it until achieving the desired speed.
- Pressure equalizer valve (controlled by screw nº 5)
- The piston responsible for equalizing the pressure during descent may be blocked  open the screw, take out the piston positioned in the inside and clean
any
possible shavings or impurities both in the piston and its frame.
- Check non-return valve block
- Check the correct functioning of the non-return valve block piston. To do this, take apart the hose and the joint nut with its valve block and put pressure on
the
front of the check valve piston. If the piston movement is blocked by any obstacle, take the whole block apart, clean any impurities and go over the piston
with sand paper (get rid of any shavings before introducing it into the block again). Afterwards check that it slides smoothly in its frame.