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9.15 Safety valve test
The safety valve of this access platform must be tested annually. Lifespan of the component is 30
years. After that the component must be replaced.
When testing the component it is crucial to detach entire solenoid with the cable and the
socket attached. The logic controller of the unit will mistake the loose socket as a broken wire
and will prevent testing.
1. Start the electric motor, make sure all booms and outriggers are in their transport positions,
and leave the motor running.
2. Test all boom movements (also in the lower controls).
-
Boom operation must not be possible.
3. Drive outriggers against ground and level the access platform. Green indicator light must be lit.
If the green light is not ON (see 5.4.).
4. Test all boom movements (also in the lower controls).
-
Boom operation must work normally.
5. Lower all booms on their transport supports.
6. Test the safety valve K92.
-
Make sure the lower controls are selected, all
outriggers are firmly against ground
and
the green boom operation allowed light is lit
(Figure 5 (5)).
-
Test that boom movements work in lower controls panel.
-
Lower all booms on their transport supports.
-
Open the bottom plate of the chassis and release the solenoid on the safety valve
(Figure 24 (7)) by releasing the plastic nut and pulling the solenoid out.
-
Test boom operation
→
Boom movements must not work.
-
Put the solenoid back.
-
Ensure boom movements will work.
-
Tighten the plastic nut and close the bottom plate of the access platform.
-
Return all booms and drive outriggers in their transport positions.
-
Stop the motor.
In case the machine does not function as described in steps 1-6 the safety valve is defective.
All defective valves must be replaced with new valves and the safety valve check carried out
before continuing operation on the machine.
