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Valve plate has a plane equipped with a flow and spherical flow two ways.

Deputy spherical friction with the flow in the cylinder with a relatively shallow stream surface scratches, after grinding technique amended; cylinder with flow surface grooves when the deeper, you should choose "the appearance of engineering skills" approach filled trench, then grinding , not blindly grinding ,, to prevent copper layer thinning or spill out of the steel substrate.

Plane friction pair assignment approach may be relatively high precision grinding on channels.

Cylinder and valve plate in front of grinding, you should measure the total thickness of the scale and the scale should be ground off, and then adjust compensation to the mat. Larger valve plate grinding amount, after grinding should re-treated to guarantee hardened layer hardness (Table 2).

Table 2 piston pump parts hardness specification

Referrals plunger rod hardware HS84

Referrals plunger rod ball hardness> HS90

Swash plate appearance referral hardness> HS90

Referrals valve plate hardness> HS90

After the cylinder block and valve plate correction, the choice of the following ways to view the status of cooperation in face of the leak that the flow in the disk with Vaseline oil, the drain channel blocked, painted with good oil flow channels on the flat plate or flat, and then placed on the cylinder valve plate, write diesel cylinder bore, an interval of oiling, ie an oiling hole, a hole is not oiling, surveys more than 4h, the plunger holes diesel no leak and collusion, and to clarify the cylinder valve plate grinding qualified.

4 Conclusion

Piston length of life using the number, and the usual maintenance of conservation, hydraulic oil quantity and quality of oil cleanliness and so on. Prevent oil particles in the form of piston friction pairs wear, but also an effective way to extend the number of piston life.

Replacement parts in the repair should be produced using original parts that sometimes more than other parts of the offer imitation expensive, but the quality and stability is better, if the purchase price of a cheap imitation parts, seems to be cost savings in the short term, But thus it brings out hidden dangers, but also may use form larger piston damage.

on

High pressure pump

Works description:

Kawasaki negative flow system for high-pressure pump displacement control dispense controlled and electronically controlled two states

Electronic Control Status:

Changes associated with the displacement control signal is hydraulic pump oil flow before,

After the oil pump oil flow and pilot and negative flow

the amount,

Wherein the front and rear pump oil flow directly controlled high pressure fuel pump,

Pilot oil after electro-proportional control valve throttling high-pressure pump,

We can call it

For the pilot secondary pressure. We'll pump control as an example to analyze the changes in displacement below.

First, we must clear a few concepts

1.

Source displacement control signal is:

Before pump oil flow,

After the pilot secondary pump oil flow and oil flow and negative flow,

Wherein the front pump

Oil flow control a piston,

After a piston pump oil flow control piston and the swash plate

(End of the control piston of the small end of the swash plate,

It is often

Open state, end state control of the big end is normally closed, end of the control line pressure piston), a negative flow control piston, pilot two

Two times the oil flow control piston