In Compound Operation Of Work Equipment, Speed Of Part Loaded More Is Low; When Machine Swings And Raises Boom Simultaneously, Boom Rising Speed Is Low; When Machine Operates Work Equipment Or Swings And Travels Simultaneously, Travel Speed Lowers Largely - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
H-14 In compound operation of work equipment, speed of part loaded more is low
Trouble

• In compound operation of work equipment, speed of part loaded more is low.

Related
• Carry out the troubleshooting in working mode A.
information
Possible causes
and standard
Malfunction of pressure
value in normal
1 compensation valve on
state
less load side
H-15 When machine swings and raises boom simultaneously, boom rising speed is
low
Trouble

• When machine swings and raises boom simultaneously, boom rising speed is low.

Related
• Carry out the troubleshooting in working mode A.
information
Possible causes
and standard
Malfunction of defective
value in normal
1
seal of LS selector valve
state
H-16 When machine operates work equipment or swings and travels simultaneously,
travel speed lowers largely
• When machine operates work equipment or swings and travels simultaneously, travel speed lowers
Trouble
largely.
Related
• Carry out the troubleshooting in working mode A.
information
Malfunction of work equip-
1 ment control valve (pres-
sure compensation valve)
Possible causes
and standard
Malfunction of swing con-
value in normal
2 trol valve (pressure com-
state
pensation valve)
Malfunction of travel control
3 valve (pressure compensa-
tion valve)
20-516
(1)
Cause Standard value in normal state/Remarks on troubleshooting
The pressure compensation valve of the control valve on the less load
side may have a malfunction. Check it directly.
Cause Standard value in normal state/Remarks on troubleshooting
The LS selector valve of the control valve may have a malfunction or a
defective seal. Check it directly.
Cause Standard value in normal state/Remarks on troubleshooting
The pressure compensation valve of the work equipment control valve
may have a malfunction. Check it directly.
The pressure compensation valve of the swing control valve may have a
malfunction. Check it directly.
The pressure compensation valve of the travel control valve may have a
malfunction. Check it directly.
Compound operation
Boom RAISE + Arm IN
Boom RAISE + Arm OUT
Boom RAISE + Bucket CURL
Arm OUT + Bucket CURL
Boom LOWER + Arm OUT
H-14, H-15, H-16
Larger Less load
load side side
Boom Arm
Arm Boom
Boom Bucket
Arm Bucket
Arm Boom
PC130-7