D877 MGB Rev01 HE250.docx
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7 Maintenance valve unit HEVOS HE250
7.1
Maintenance program and periodic checks
N.
List control operations
Recommended time
Installat. Month
Annual 10 years
1
SCH001 BOARD ERROR STORAGE
X
2
2
GROUP AND GAUGE SHUT-OFF VALVE
6
3
VALVES LEAKAGES
X
2
X
4
EXTERNAL LEAKAGES
X
2
5
WORKING PRESSURES
X
X
6
PRESSURE RELIEF VALVE CALIBRATION
X
X
7
MANUAL LOWERING CHECKING
X
X
8
HAND PUMP CHECKING
X
X
9
CHECK TO DOUBLE PRESSURE
X
6
10
OIL CHECKING
X
X
11
MOTOR PROTECTION CHECKING
X
6
12
FILTERS
X
X
13
FLEXIBLE HOSE
X
X
14
FLEXIBLE HOSE REPLACEMENT
X
15
GROUP REVIEW
X
16
PLATES AND SCHEMES
X
X
7.2
Description of controls
1. Check the list of errors through the terminal or Wi-Fi device.
Using teminal you need access to read parameters from P600 to P679 indicate that, from newest to
oldest, the error code and time of storing machine.
Via Wi-Fi device, it reads through the access to the specific section of its application.
However, it is possible to reset the fault history through command P702.
2. Close the ball valve (19) and open the manometer shut off valve (2). Release all pressure by manually
adjusting the knob (17). Check that the level of pressure on the pressure gauge is next to zero (equal
to the valve setting 25), then, after one minute, re-open the valve (19).
3. With oil at room temperature close the ball valve (19) and open the manometer shut off valve (2).
Verify that the pressure indicated on the pressure gauge does not drop more than 4 bar in 5 minutes.
4. If there are traces of oil outside the group, check the tightness of the adjustment screws (5, 25, 27)
and the vent plug (29). Check also the drain of the seals of the group under the MPP motor
5. Proceed, after installation, the recognition, up and down, the static and dynamic pressure. Periodically
check that the pressure values are unchanged
6. Execute the maximum pressure test, as shown in the "Operation valve group", to verify that the
calibration value corresponds to that expected. The calibration of the maximum pressure value is
determined by the adjustment (5) of the valve group.
7. Execute a test of the cabin downward displacement and a verification of the minimum operating
pressure adjus (25), as provided in the "emergency maneuvers."
8. Execute a test of the cab moving upward and a check of pressure relief valve (27), as provided in the
"emergency maneuvers."
