A4.2.The Lift Descends When Loaded; A5. Miscellany - MP sava3 Technical Manual

A4.2.The lift descends when loaded

- Presence of air in the pipes
- The existence of air inside the cylinder may cause an effect that is easy to identify. When a load is introduced, it causes a spring-like response in the
system.
 Bleed the cylinder to get rid of any air inside it (see the technical manual for the MP hydraulic cylinder MTHDCMP).
- Hydraulic oil.
- Hydraulic oil is a compressible fluid and its characteristics vary according to the temperature. If at the same time as the load is introduced into the car a
considerable descent is caused, this may be due to the following reasons.
 The lift car is very high up (floor number higher than the 5th).
 The distance up to the machine room is very large.
 A flexible hydraulic hose of more than 5 m in length has been used in the installation.
 The machine room is located at the top.
 There are great differences between the temperature during the day and at night.

A5. Miscellany

- Cleaning of the return filter
- In order to clean this component, proceed according to the following steps:
 Close the shut-off valve.
 Push the manual descent button to get rid of any residual pressure in the system.
 Using an appropriate spanner, undo the hexagonal cap and extract the mesh from the filter.
 Clean with an appropriate brush, put together and open the shut-off valve following this sequence of steps (avoid sudden movements of the system).
- Bleeding of the cylinder
- Place inside the car half of the total load admissible in the installation to bleed.
- Take the car to a suitable working position that allows you to reach the bleeder screw from the roof of the car in a comfortable and simple way.
- Leave it to stand in the same position for at least 10 minutes.
- Proceed to slowly untighten the bleeder screw until the air begins to come out. This moment can be clearly detected by the noise it produces (a quiet
whistle) and by the oil that comes out of the cylinder under pressure (protect the outlet with a cloth to avoid any undesirable spattering).
- Tighten the bleeder screw when you notice that the oil comes out without any air.
- Repeat the previous operation but this time whilst the car is ascending at a slow speed. Untighten the screw and begin the ascent. Air mixed with oil will
start to come out up until a moment when only oil appears. This will be the point to stop the bleeding (carry out this operation whilst the bleeder screw remains
accessible from your working position).
- Repeat the operation after the car has made various trips and after approximately 2 or 3 hours from the moment of changing the fittings.
- Change of fittings in the cylinder
- Check that the cylinder does not have any scratches or defects which may cause oil leaks. If this is the case and some are found, try to remove them using
sand paper. Sand with horizontal movements trying not to cause any greater damage.
- Secure the car, jamming it or suspending it at a distance a little bit higher than the lowest stop.
- Take apart the joint between the piston and the bolster or frame. Clean the cylinder head.
- Untighten the screws and remove the locking clamp. Place two M6 screws in the bushing in order to extract it.
- Remove the clamp saddle, the scraper and the o-ring seal. Use a small flat-tip screwdriver.
- Assemble the new spare parts in the bushing. Carry out the assembly with a nylon hammer.
Be careful not to damage the o-ring seal.
- Place the new scraper in the locking clamp, set the clamp in its frame and tighten the locking screws.
V700 - 11/2017
MP sava3 Hidraulic Power Unit 1 ¼" 1 ½"
34/40 MTMECMPsava3_700_EN