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BREAKDOWN DETECTION FLOW CHART
Sheet DP038
NO STEERING MOVEMENT
(RIGHT AND/OR LEFT) ON THE REAR AXLE
Folio 3/4
The defective
REAR steering movement
left (2) or right (1) is made in
response to an opposite movement
control: right (2) or left (1)
NO
YES
- Invert the coils of the jib electrovalve YV21A and
YV21B
- Press the pedal and make a travel movement
- Activate the REAR steering switch SM4
B
Put coils YV21A and YV21B back
into their original positions
D
NO
YES
12V OK at
terminals of
electric
connectors
- Open the turntable control panel
- Press the pedal and make a travel movement, activate
the REAR steering switch SM4 and check for 12V
voltage on terminals 307 (left) and 308 (right) of the
printed circuit
Replace the
defective coil
END
NO
YES
12V
OK
Replace the
U1 module
Repair the connection or
replace the wiring harness
between the turntable control
panel and electrovalve YV21
END
NO
YES
The fault
persists
Replace the
printed circuit
END
END
Press the pedal, make a travel movement and
activate the REAR steering switch SM4 and
check for 12V voltage at the terminals of the
connector of YV21A or YV21B
Replace
electrovalve YV21
ENDE
Summary of Contents for HA20PX
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Page 4: ...1 Repair manual 2...
Page 10: ...Repair Manual vi 15 CORRECTIVE MAINTENANCE PROCEDURES 177...
Page 26: ...Repair Manual 20...
Page 28: ...Repair Manual 22...
Page 36: ...Repair Manual 30...
Page 46: ...135 Repair manual 40...
Page 47: ...Repair manual 135 41 7 SAFETY LOCATION...
Page 48: ...135 Repair manual 42...
Page 51: ...Repair manual 135 45 8 1 3 Positions of fuses 19 22 26 27 23 25 24 21 20...
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Page 66: ...135 Repair manual 60...
Page 74: ...Repair manual 68 12 7 2 Commom orange label 6...
Page 82: ...135 Repair manual 76...
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Page 86: ...PREVENTIVE MAINTENANCE SHEET...
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Page 248: ...CORRECTIVE MAINTENANCE SHEET Folio 2 2 CHANGING THE HYDRAULIC PUMP Sheet C091 7 6 3 3 1 2 4 5...
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Page 265: ...CORRECTIVE MAINTENANCE SHEET Folio 3 3 CHANGING THE SLEW RING Sheet C106 12 13 11...
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Page 274: ...CORRECTIVE MAINTENANCE SHEET Folio 2 2 CHANGING THE JIB CYLINDER Sheet C115 2 4 3 5 1...
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Page 282: ...CORRECTIVE MAINTENANCE SHEET CHANGING THE COUNTERWEIGHTS Sheet C134...