Komatsu PC58UU-3 User Manual

TROUBLESHOOTING H-2
20-510
PC58UU-3
1
H-2 There is excessive drop in engine speed or engine stalls
Cause Remedy
1
• Oil temperature: 50°C
• Is full throttle engine speed
kept higher than 2,100 rpm?
(If not, go to [NO] side.)
When bucket is curled and blade is
raised simultaneously until their cir-
cuit is relieved, does engine speed
lower excessively?
No
Yes
2
• Oil temperature: 50°C
• Is full throttle engine speed
kept higher than 2,100 rpm?
(If not, go to [NO] side.)
When blade is raised or bucket is
swung until its circuit is relieved and
other work equipment is moved
without relieving its circuit, does
engine speed lower excessively?
No
Yes
Carry out troubleshooting
No. 4
3
• 26.0
+1
- 0.5
MPa
{265
+10
-5
kg/cm²}
• Run engine at full throttle
Is bucket CURL relief pressure nor-
mal?
No
Yes
4
• 21.6
+1.5
- 0.5
MPa
{220
+15
- 5
kg/cm²}
• Run engine at full throttle
Is blade RAISE relief pressure nor-
mal?
No
Yes
5
When gear pump circuit relief valve is
adjusted, repaired, or replaced, is
trouble repaired?
No
Yes Defective gear pump circuit
relief valve
Adjust or
replace
6
When main relief valve is adjusted or
replaced, is trouble repaired?
No
Yes
Defective main relief valve
Repair or
replace
7
Does monitor display error code [54]
to indicate defective TVC?
No
Yes
8
Is TVC connector connected?
No
Defective connection Repair
Yes Defective TVC-EPC valve
(Solenoid valve)
Replace
9
When engine speed changes, does
TVC current change?
No
Defective controller
Repair or
replace
Yes
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Komatsu PC58UU-3 Specifications

General

Brand	Komatsu
Model	PC58UU-3
Category	Construction Equipment
Language	English