Excavator repair cheats

1st stroke

The engine water temperature is high. After the thermostat is removed, the small hole under the thermostat seat is plugged with wood plug to prevent hot water recirculation.

2nd stroke

The smallest core in the pilot handle acts primarily as a micromanipulator.

3rd stroke

Individual parts are often blocked, and it should be checked whether the connected pipeline is caused by internal peeling.

4th stroke

The middle of the spring of the distributor stem is thinner than the outer ring,

It should be the stroke buffer at the end of the stroke and the intermediate sleeve limits the stroke of the stem.

5th stroke

The approximate judgment of the iron filings:

1. It is the cylinder that is shiny, because there is no tarnishing at low speed.

2. Hair is a pump, or a motor bearing is produced because of high speed rotation and dullness.

6th stroke

A joint action is slow or does not move. The associated pilot secondary pressure is below 20KG.

Reason: When replacing the handle oil seal, the small core on the lower side falls below, not in the hole of the valve stem. In the field, the wire with long and thick difference is replaced, and the test is OK. Excavator spare parts

7th stroke

About walking is powerless. For vehicles parked at the beach for a long time, the track shaft will rust and cause great resistance to walking.

Action: Replace the track shaft.

8th stroke

The handle becomes heavier:

1, the reason: the handle back to the oil pipe is not smooth. Handling: Replace the return line.

2. Reason: The handle of the relevant action is blocked by a small hole of the control spool.

3, after cleaning, get it.

9th stroke

Black smoke: oil head, oil pump, supercharger (including intercooling, pipeline), air filter, and then hydraulic pump overload.

10th stroke

After the pump is installed, the kerosene can be leaked at the high pressure port. If it leaks, find the cause. Is the distribution plate installed, the pressing force is not enough, the cylinder and the disk, the disk and the intermediate are not well matched.

11th stroke

Hydraulic oil temperature: The oil temperature in the fuel tank is not more than 90 degrees (old car), and the new car is within 80 degrees.

12th stroke

When the hydraulic pump is being repaired, the cylinder and the plunger are best marked after being removed. When reassembling, the order of removal is avoided to avoid the bad friction of the even part, resulting in excessive internal leakage.

13th stroke

The main factors of high hydraulic oil temperature:

1. Leakage

2, throttling

3, heat dissipation

14th stroke

The hydraulic fuel tank cap is damaged, the pressure cannot be maintained, there will be no back pressure in the fuel tank, the pump suction port has no pressure, the oil inlet resistance is increased, and the pump is easy to suck in air, causing premature pump damage.

15th stroke

Black smoke on no-load: The main pressure of the boom is generally 110-120Kg. If the pressure is too high, the oil return resistance should be considered too large.

the reason:

1. The dispenser stem is incorrectly installed.

2. The oil back pressure is too high, check whether the oil return check valve is stuck, whether the oil return filter is blocked or not.

16th stroke

About the car:

1. If the excavator engine is smoky when the load is heavy and the engine speed is severe, the hydraulic pump may absorb more power than the engine power. If the displacement is lowered a little, the vehicle phenomenon will be improved, which is a hydraulic problem.

2, the engine power is insufficient, check the oil circuit, air filter, boost pressure, fuel supply advance angle and so on.

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17th stroke

Heavy handle:

1. The pilot pressure is low and the oil inlet filter is clogged.

2. The handle returns to the oil pipe and the oil tank is not smooth, resulting in excessive oil return resistance.

18th stroke

After changing the hydraulic oil three, the whole car has no action:

Cause: The replaced oil reacted with the original oil, the 7 valve stems were dead, and the pilot lock solenoid valve was stuck.

Disposal: Disassemble the dispenser, solenoid valve, etc., thoroughly clean the valve stem, core, etc. with a toothbrush.

19th stroke

When disassembling the pump and the motor gear, mark the meshing position between the shaft and the gear teeth before the disassembly, and ensure that the new meshing noise is generated by assembling the meshing marks during assembly.

20th stroke

If the contact surface of the small digging pump swashplate and the sliding plate is not flat, you can go to the lathe, use the knife to mill to the full eat, and then grind it into a glossy surface with the pump, then install it with a thickened slide. Otherwise, the plunger will bite. https://jnjmzm.wixsite.com/sdjygcjx