OPERATION TROUBLES AND ACTIONS
3-247
Chassis 3
q ( ): Always contact your Komatsu distributor when dealing with these items.
q In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy
Speed of travel, swing, boom, arm,
bucket is slow
•Lack of hydraulic oil •Add oil to specified level, see
CHECK BEFORE STARTING
•Controller abnormal
•Hydraulic circuit abnormal
•Safety valve abnormal
•Have inspection carried out
Pump generates abnormal noise
•Clogged element in the
hydraulic oil tank strainer
•Loose suction hose
•Defective air bleeding
•Clean, see EVERY 5000
HOURS SERVICE
•Tighten
•Bleed air
Excessive rise in hydraulic oil tem-
perature
•Dirty oil cooler
•Lack of hydraulic oil
•Abnormal rotation of the cooling fan
on the oil cooler side
•Clean, see EVERY 500 HOURS
SERVICE
•Add oil to specified level, see
CHECK BEFORE STARTING
•Have inspection carried out
Track comes off •Track too loose
•Adjust track tension, see WHEN
REQUIRED
Abnormal wear of sprocket •Too tense track shoe
Does not swing •Swing lock switch still applied •Turn swing lock switch OFF
Swing, travel, work equipment can-
not be operated
•Hydraulic ladder is not stowed
•Abnormal proximity switch for
hydraulic ladder
•Fuel quick charge (if equipped) is
not stowed away
•Abnormal proximity switch for fuel
quick charge (if equipped)
•Service center (if equipped) is not
stowed
•Abnormal proximity switch for Ser-
vice center (if equipped)
•Stow hydraulic ladder
•Adjust proximity switch. For details,
see "Check Proximity Switch"
•Stow fuel quick charge
•Adjust proximity switch. For details,
see "CHECK PROXIMITY SWITCH"
•Stow Service center
•Adjust proximity switch. For details,
see “"Check Proximity Switch"“
Hydraulic ladder is lowered but lad-
der warning lamp does not light up
•Proximity switch abnormal •Adjust proximity switch. For details,
see "Check Proximity Switch"
Service center (if equipped) is low-
ered but ladder warning lamp does
not light up
•Proximity switch abnormal
•Adjust proximity switch. For details,
see "Check Proximity Switch"
The PTO oil temperature rises too
high.
•Shortage in lubrication oil
•Clogging of PTO oil filter strainer
•Add oil to the specified level, see
CHECK BEFORE STARTING.
•Clean the strainer, see EVERY
1000 HOURS SERVICE.
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