【 1 】 komatsu excavator hydraulic system of working device, walking, turning speed is low or weak fault can be caused by the following reasons:
1. Bad PC valve adjustment.
2. The LS valve assembly.
3. The damage of PC valve assembly.
4. The pressure reducing valve output circuit of the hydraulic component failure
5. Plunger pump failure.
6. Servo piston plunger pump failure.
7. The main relief valve adjustment is not correct.
8. Poor unloading valve action.
9. The main relief valve damage.
Problems found solution also immediately take out.
[the solution] through the fault analysis, the following solutions:
1. Adjust or repair the PC valve
2. Check and repair the LS valve
3. PC valve
4. Repair valve output loop hydraulic components or replace relief valve output loop hydraulic components
5. Maintenance plunger pump
6. Repair or replace the servo piston plunger pump
7. To adjust the relief valve
8. Adjust or repair unloading valve
9. The main relief valve
【 2 】 komatsu excavator to burn oil fault three common causes:
1. The excavator air filter become dirty
2. The excavator into gas engine
3 excavator oil didn't according to normal replacement or unoriginal excavator oil were used
Komatsu excavator to burn oil fault solution:
1 often clean and replace the excavator air filter
2 maintenance excavator engine
3 according to the rules used excavator oil, use match the excavator oil
【 3 】 komatsu excavator walking wandering
Cause a: normal walking wandering big possible reason is:
1. The pressure reducing valve failure.
2. The main operating valve core is bad action.
3. The walking motor assembly failure.
4. The LS valve damage.
5. PPC valve damage.
6. Walk pressure compensation valve failure.
For because the following solutions:
1. Repair pressure reducing valve
2. Main operating valve valve core
3. Maintenance walking motor
4. The LS valve
5. PPC valve
6. Walk pressure compensation valve
Genesis 2: starts wandering possible reason is:
1. Walk adverse pressure compensation valve action.
2. The throttle was blocked in the servo mechanism.
To 2 draw the following solutions:
1. Walk pressure compensation valve
2. Clean up or dredge orifice in servo mechanism
[4] komatsu excavator used after a period of time, many master komatsu excavator are met "excavator in use process appeared unable to walk (unilateral couldn't walk only)" failure causes:
1. The main operating valve in filling valve action.
2. Walking motor valve failure.
3. The bad terminal transmission.
4. Walking motor damage.
The solution:
1. The filling valve
2. Maintenance walking motor valve
3. Maintenance terminal drive adjustment
4. Walking motor maintenance
[5] komatsu excavator used after a period of time, a lot of komatsu excavator master all reflect the "walking" (or slow) fault causes:
(1) CO valve is faulty.
(2) CO cancel the solenoid valve is faulty.
(3) the main relief valve set pressure drop.
(4) level 2 overflow solenoid valve is faulty.
The solution:
1. Repair CO valve
2. Maintenance CO cancel the solenoid valve
3. Check if the main relief valve set pressure drop
4. Maintenance level 2 overflow solenoid valve
二手挖掘机
popular types：Caterpillar Komatsu Hitachi
