The Speed Or Power Of The Whole Work Equipment And Travel Is Low - Komatsu Galeo BR380JG-1E0 Shop Manual

SEN02306-01
H-1 The speed or power of the whole work equipment and travel is
Trouble

• The speed or power of the whole work equipment and travel is low.

Related
• Carry out troubleshooting in the WORK or TRAVEL mode.
information
Malfunction of unload
1
valve
Defective adjustment
2 or malfunction of main
relief valve
Malfunction of self-
Possible
3 reducing pressure
causes and
valve
standard value
in normal state
Defective adjustment
4 or malfunction of PC
valve
Malfunction of LS-EPC
5
valve
8
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with engine stopped, then run engine at high idle and carry out
troubleshooting.
Work equipment switches and travel
Turn all switches OFF and
a Prepare with engine stopped, then run engine at high idle and carry out
troubleshooting.
Measurement condition
Relieve travel circuit (Note 1).
If the oil pressure does not become normal after adjustment, the main relief
valve may have a malfunction or a defect in it. Check the main relief valve
directly.
a Prepare with engine stopped, then run engine at high idle and carry out
troubleshooting.
Work equipment switches
and set lever in neutral.
a Prepare with engine stopped, then run engine at high idle and carry out
troubleshooting.
Oil pressure to be
measured
Pump discharge
PC valve output
If the oil pressure does not become normal after adjustment, the PC valve
may have a malfunction or a defect in it. Check the PC valve directly.
a Prepare with engine stopped, then run engine at high idle and carry out
troubleshooting.
Mode
Travel
lever
set lever in neutral.
and travel lever
Turn all switches OFF
Measurement condition
pressure
Relieve travel circuit
pressure
Travel Travel
speed lever
Neutral
High speed
position
Medium or Neutral
Low speed position
40 Troubleshooting
Unload pressure
3.9 ± 1.0 MPa
{40 ± 10 kg/cm 2 }
Main relief pressure
+1.0
39.2 MPa
–2.5
+10
{400 kg/cm }
2
–25
Control circuit basic pressure
2.83 – 3.43 MPa
{29 – 35 kg/cm 2 }
Ratio of oil pressure
1
Approx. 3/5
LS-EPC output pressure
Approx. 0.39 MPa
{Approx. 4 kg/cm 2 }
Approx. 2.34 MPa
{Approx. 23.9 kg/cm }
2
BR380JG-1E0
low1