The slide valve cannot be reset and cannot be positioned in the position position

Reset spring deformation;

Positioning spring deformation;

Positioning sleeve wear;

Between valve body and slide valve is not clean;

Outside the valve control mechanism is not working;

The coupling bolt is screwed too tight, causing deformation of the valve body.

Replace the reset spring;

Replace positioning spring;

Replace positioning sleeve;

. Cleaning;

Control mechanism on adjusting valve;

. Re-tighten the connection bolt.

External leakage

O ring at both ends of valve body is damaged;

O - ring between the contact surfaces of each valve body is damaged.

. Replace the o-ring.

The pressure of the relief valve is unstable or not adjustable

Pressure regulating spring deformation;

Lifting valve wear;

The locking nut is loose;

The damping hole of the main valve core is blocked;

Bad pump;

The valve core is stuck.

Replace the pressure regulating spring;

Replace the lift valve;

Tighten the locking nut;

Clean the main valve core to make the damping hole unimpeded;

Overhaul the pump;

Cleaning.

The slide valve is in neutral position when the working mechanism obviously sinks

Due to wear gap between valve body and slide valve increases;

The position of the slide valve is not aligned.

Conical valve outside wear or dirt pad;

O type slide valve inside the ball and ball seat edge contact.

Repair or replace the slide valve;

Keep the position of the slide valve in the center;

Replace conical valve or remove dirt;

Replace steel ball or trim edges.

The reasons for the reduction in pressure of electric excavator are as follows:

On the one hand, said is the hydraulic pump parts aging caused by. Some hydraulic pump use time is too long will appear spare parts clearance is too large resulting in insufficient pressure.

The second aspect is that the pressure of the hydraulic pipe is reduced in the length of the tubing due to excessive length.

The third aspect is that the hydraulic fluid itself chose the wrong path and ended up with a decrease in pressure.

A bit of hydraulic oil valve control reduces pressure due to aging

Hydraulic electric excavator belongs to the control valve in the control of all the mechanical action, on the one hand is too long time caused by rust and wear inside the situation caused by the work is not sensitive. Even belongs to malfunction, causes the hydraulic electric excavator to malfunction even belongs to cannot send the work.

Two point hydraulic tubing elbow is too small resulting in hydraulic pressure reduction hydraulic oil head suddenly smaller will appear pressure will directly appear smaller things, resulting in the hydraulic pipe directly appear pressure reduction there are a lot of reasons hope you and we look for reasons. One of the hydraulic safety valve problems can also lead to insufficient pressure.