Komatsu PC58UU-3, Руководство по ремонту

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TROUBLESHOOTING H-28
PC58UU-3
20-545
1
★
If there is any other trouble in the work equipment, travel system, or blade system, see H-1.
H-28 Swing speed or power is low
(Work equipment, travel, and blade operations are normal)
a) Swing speed or power is low in both directions
1
Cause Remedy
• 26.0
+1.0
-0.5
MPa
265
+10
-5
kg/cm²
• Run engine at full throttle.
Is swing relief pressure normal?
NO
YES
2
• 2.45 MPa {25 kg.cm²}
• Run engine at full throttle.
Does pressure rises to near relief
pressure during ordinary swing?
NO
YES
3
Is switch brake dragging sound
heard?
NO
YES
4
When throttle of swing brake reset
line is cleaned, is trouble repaired?
NO
Defective operation of
swing brake (Defective
reset)
Repair or
replace
YES
Clogging of throttle Clean
5
Does check valve in spool move
smoothly?
NO
Defective operation of
check valve in spool Repair or
replace
YES Defective motor unit,
brake, swing machin-
ery, or circle Check,
repair, or
replace
6
• 2.45 MPa {25 kg/cm²}
• Run engine at full throttle.
Is PPC pressure normal (at PPC
pressure inlet of control valve)? NO
YES
7
When swing PPC slow return valve
and swing PPC circuit throttle are
cleaned, is trouble repaired?
NO
YES Clogging of throttle or
defective operation of
slow return valve Clean,
repair, or
replace
8
Does spool move smoothly?
NO
Defective operation of
spool Repair or
replace
YES
Defective swing motor
Repair or
replace
9
When swing PPC line throttle is
cleaned, is trouble repaired?
NO
YES
Clogging of throttle Clean
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