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The plunger rod and the plunger rod cylinder bore diameter φ16 φ20 φ25 φ30 φ35 φ40
Specifications gap 0.015 0.025 0.025 0.030 0.035 0.040
Limit 0.040 0.050 0.060 0.070 0.080 gap 0.090
The plunger rod ball
And slipper ball norms 0.010 0.010 0.015 0.015 0.020 gap 0.020
Limit gap 0.30 0.30 0.30 0.35 0.35 0.35

Swash plate effect after a period of time, the swash plate plane will show a concave appearance, in the selection of channels before polishing should first measure the initial hardness scale and plane. After grinding, and then measured the amount of polishing is the number, as in less than 0.18, not hinder the use of piston pump; if exceeded 0.2mm or more, should be used in a way to adhere to the original nitride nitride layer thickness.

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When the swash plate plane is scraped out of the groove ball plunger, the choice of laser cladding alloy powder approach to corrections. Laser cladding contact skills can guarantee the strength of materials, but also ensures that information fill melt hardness, hardness does not drop the whole periphery of arrangements.

Also along with the choice of chrome craft with welding rod welding, repair welding over the swash plate heat from the ground plane for an optimal selection of nitriding furnace heat treatment. Regardless of which approach to take corrective swash plate, it has the necessary rehabilitation of the existing scale precision, hardness and appearance roughness.

3.3 valve plate and the cylinder surface with a stream of correction

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.