T-402
No. Symptom Page
3. Troubleshooting of the hydraulic pressure and mechanical systems T-417
H-1
All the crane, slewing and travelling speed is low, or the force is
insufficient
T-417
H-2 Engine revolution speed drops significantly, or the engine stalls T-417
H-3 None of all the working machines and the slewing/travelling works T-418
H-4 Abnormal sound is generated from the hydraulic pump or its periphery T-419
H-5
Dead slow speed operability is unsatisfactory, or responsiveness is
insufficient
T-419
H-6 Wind-up/down speed is low or weak T-420
H-7
Abnormal sound or vibration is generated from winch motor or its
periphery
T-421
H-8 Wind-up cannot be performed T-421
H-9 Wind-down cannot be performed T-421
H-10 Gear positions 1 and 2 of winch cannot be shifted T-422
H-11 Boom telescoping is slow or weak T-422
H-12 Boom derricking is slow or weak T-423
H-13 Boom extending/retracting order is disturbed T-423
H-14 Hunting occurs during boom retraction T-423
H-15 Either boom No. 2 or 3 fails to retract T-423
H-16 Crane cannot be operated discretely T-423
H-17 Natural descending amount of crane is significant T-424
H-18 Time lag of crane is significant T-424
H-19 Sway in travelling is observed T-425
H-20 Travelling speed is slow T-425
H-21 Steering is difficult or weak T-426
H-22 Travelling speed cannot be changed, or travelling speed is slow/high T-426
H-23 Travelling rubber track fails to move (one side only) T-426
H-24 Does not slew T-427
H-25 Slewing acceleration is unsatisfactory, or slewing speed is slow. T-428
H-26 Overrun after stop of slewing is significant T-429
H-27 Impact at a stop of slewing is significant T-430
H-28 Abnormal sound generated at a stop of slewing is loud T-430
H-29 Natural descending amount at slewing is significant T-430
[Note]
• The sequential order given under assumed cause and diagnostic method does not necessarily match the
order of checking. Select the item(s) to be checked in accordance with the status of the subject that can be
determined by observing the vehicle and service conditions.
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