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19.7 LEVELLING SYSTEM OF THE PLATFORM
- The platform is levelled by means of a so-called slave cylinder system:
- the slave cylinder under the platform is controlled by a master cylinder
- the platform stays in level position only if the valves in the system are tight
- the levelling system comprises the following parts:
If the platform, viewed by the operator, drifts forwards, the reason can be:
‐ a leak in the slave cylinder's double load regulation valve (on the piston rod
side) towards the electric directional valve (which is by design not tight)
‐ an internal leakage in the cylinder
If the platform, viewed by the operator, drifts backwards, the reason can be:
‐ a leak in the load regulation valve (4) on the piston (bottom) side of the slave
cylinder towards the electric directional valve (5) (which is by design not tight)
‐ an internal leakage in the cylinder
The leak will cause drifting of the platform until the load regulation valve (3) under the
platform closes. The closing is caused by dropping of the pressure on the piston rod side
to the opening ratio, which is 5:1 If the valves are not tight, refer to the point “Load
holding and load regulation valves” in the service instructions.
Settings of the load regulation valves:
- the opening pressure of the double load regulation valves (4) is 21.5 MPa (215 bar)
- the opening pressure of the load regulation valve (3) under the platform is 21.5 MPa
(215 bar)
Do not adjust the settings of the valves.
1. Mastercylinder
2. Slave cylinder
3. Load regulation valve
4. Double load regulation valve
(8A/8B in the picture presenting
the block)
5. Electric directional valve
Courtesy of Crane.Market
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