Komatsu WA70-7, Руководство по эксплуатации и обслуживанию

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Troubleshooting 4.6 Other troubles
WA70-7 – VENAM02003
4-15
4.6.3 Hydraulic system
If errors or causes of errors occur that are not listed here, have
the repair performed by your Komatsu distributor.
.
HYDROSTATIC DRIVE UNIT
Fault Cause Remedy
Machine does not drive
Parking brake is engaged Disengage the parking brake
Direction selector switch in “N” Pos.
Switch direction selector switch in
“F” or “R” position
Direction selector switch is not func-
tioning Check the function of the direction
selector switch *)
Oil level in the hydraulic tank is too
low
Fill up hydraulic oil.
Machine only travels very slowly
and is not operating at full power
The hydrostatic engine is not work-
ing properly
Hydrostatic engine is defective
Check the system *)
Replace the hydrostatic engine*)
Forward/reverse valve is defective
Check the forward/reverse valve*)
Replace the defective forward/
reverse valve *)
Switch relay is not functioning.
Check the function of the switch
relay; repair or replace a defective
switch relay *)
Control valve of the pump is not
functioning.
Check the function of the control
valve; replace the control valve if it
is defective *)
Hydrostatic pump is defective. Replace the hydrostatic pump *)
Required pilot pressure not reached
Required charge pressure not
reached
Required high pressure not reached
Check the pilot pressure, adjust if
necessary *)
Check the supply pressure, adjust if
necessary *)
Check the high pressure, adjust if
necessary *)
Check the high pressure valve,
adjust if necessary *)
Check the pressure separation,
adjust if necessary *)
Check the pilot device, adjust if nec-
essary *)
Inch valve defective or incorrectly
set Check the setting of the inch
valve *)
Replace the defective inch valve *)
Hydraulic filter clogged
Replace the filter element of the
hydraulic filter