Speed Or Power Of All Work Equipment, Travel, And Swing Is Low - Komatsu Galeo PC800-8 Shop Manual

SEN00794-02
H-1 Speed or power of all work equipment, travel, and swing is low
Failure

• Speed or power of all work equipment, travel, and swing is low

phenomenon
• Measure the speed of the work equipment, travel, and swing speed and check that all of them are slow
(or their power is low).
• Check that abnormal sound is not heard from around the pump.
Relative (If abnormal sound is heard, carry out the related troubleshooting.)
information • Check that the machine does not deviate.
(If the machine deviates, carry out the related troubleshooting.)
• Carry out all the troubleshooting in working mode P.
• If failure code related to pump control is also displayed, carry out troubleshooting for it first.
1 Defective engine unit
Malfunction of self
2
pressure reducing valve
Possible causes
and standard
value in normal
state
Leakage in control
3
system devices
Wrong adjustment or mal-
4
function of main relief valve
8
Cause Standard value in normalcy and references for troubleshooting
aRun the engine at high idle during troubleshooting.
Heavy lift switch and right work
equipment control lever
Heavy lift switch OFF +
Heavy lift switch ON + Boom
aKeep the engine stopped for the preparations, and run it at high idle
during troubleshooting.
If fan is rotating and pressure at self pressure reducing valve is low, self
pressure reducing valve may be malfunctioning. Check self pressure
reducing valve directly (It cannot be adjusted).
aStop the engine and block (1) – (9) in Fig. 1 in order. Run the engine
at high idle and check.
aKeep the engine stopped for the preparations, and run it at high idle
during troubleshooting.
Heavy lift switch and right work
equipment control lever
Heavy lift switch OFF +
If the oil pressure is still abnormal after adjustment, the main relief valve
(on the low-pressure set side and high-pressure set side) may be defec-
tive. Check the main relief valve directly.
Boom RAISE relief
RAISE relief
Control levers
All levers in neutral
Control levers
All levers in neutral
Boom RAISE relief
Heavy lift switch ON +
Boom RAISE relief
40 Troubleshooting
Engine speed
Above 1,700 rpm
Above 1,700 rpm
Control relief pressure
+0.49
3.24 MPa
0
+5
{33 kg/cm }
2
0
Control relief pressure
+0.49
3.24 MPa
0
+5
{33 kg/cm 2 }
0
Main relief pressure
+1.0
32.4 MPa
–2.0
+10
{330 kg/cm 2 }
–20
+1.0
33.8 MPa
–2.0
+10
{345 kg/cm }
2
–20
PC800, 850-8