4. At floor
A4.1.The lift descends continuously
- Descent valve (Locking seal)
- The seal of the descent piston is not watertight. The problem can be clearly detected when there is rapid balancing. To assure ourselves of this, we must
remove the right cap of the hydraulic power unit (level cap) and the transparent sheaths of the return pipes in the valve block. Once this has been done, we
must try to localize the loss of oil. If it is being caused by the first pipe (situated beneath the start-up sequence block), we must proceed to change the descent
piston seal and to clean any possible impurity existing between the piston and the block’s conical lock washer.
Clean any shaving or impurity.
Proceed to replace the seal.
- Descent electrovalve (YD)
- The coil is continuously supplied.
- The actuator ball does not tighten correctly (Watch if there are oil drops escaping through the connection of the tank to the descent electrovalve block).
Clean any possible shaving or impurity.
- Manual descent valve
- The actuator ball does not tighten correctly (Look for a possible oil leak through the connection of the tank to the manual descent valve.
If this is the case, it will be necessary to replace the manual pump unit.
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