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China hydraulic pump manufacturers, hydraulic pumps and motors, hydraulic pump parts, piston pump parts, hydraulic pump,  hydraulic spare parts, hydraulic piston pump, hydraulic vane pump, hydraulic gear pump, Hydraulic Motor,Pilot Pump, Charge Pump for Rexroth,Caterpillar,Vickers,Denison,Sauer,Kawasaki,Commercial,Linde,Parker,Liebherr,Komatsu,Eaton,Daikin,Kubota,Johndeer,Hitachi. T6C,T6D,T6E,45VQ,35VQ,25VQ,20VQ,V10,V20,Hydraulic Motor.

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Rearward pressure hydraulic oil tank after each engine unit, it is necessary to use other hydraulic stains box arrives pressure, competence operate machinery. When the hydraulic pressure in the tank served as the lack of machinery, and hydraulic slip whip will be formed within the pull-off appearance, the formation of abnormal wear of the pump body board and return the platen. Selection charge pump supply piston pump, the use of 3000h, the operator need 1-2 times a day on the piston view to view the movement of the hydraulic pump is not working properly. Found cylinder speed drops or stuffy car, you should pump up the collapse of view, is not a view of the impeller edge scratching appearance, internal gear pump gap is not too large.

About Self-suction-type piston pump, the hydraulic oil tank must not fall below the lower limit of the oil standard, should adhere to meet the amount of hydraulic oil. The higher the cleanliness of hydraulic oil, the use of the longer life expectancy of the hydraulic pump.

2 pump bearings

The most important parts of piston bearing, if the bearing clearance presentation, you can not guarantee normal internal pump three pairs of friction pair gap, together will damage the hydrostatic bearing oil film thickness of each friction pair, down piston pump bearings use life expectancy. According to information supplied to the hydraulic pump factory, using the average life expectancy of bearings is 10000h, beyond this value will need to replace the new port.

Open bearing down, no professional view instrument is unable to view the bearing clearance, the only use visual, such as found in the outer roller scratches or discoloration, it is necessary to replace.

When replacing the bearing, should pay attention to the type of original letters and bearing, mostly piston bearing use large load bearing capacity, the best purchase of the original factory, the original specification of the goods, if the replacement of another brand, you should consult an experienced bearing The staff look-up table on the exchange, the purpose is to uphold the level of accuracy and load bearing capacity.

3 three pairs of friction pairs View and correction

3.1 plunger rod and cylinder bore

Table 1 is a piston pump replacement parts specification (see Figure 1), when the various voids listed in the table of tolerance, according to the following approach fix:

(1) cylinder inserts copper sleeve, you can choose to replace copper sleeve approach amendment. First, a group of at plunger rod diameter trimmed to a consistent scale, and then 1000 # sandpaper polished than the outer diameter.

Three ways to install copper cylinder sleeve:

(A) loading or copper cylinder plus warm jacket cryogenic extrusion, interference installation; (b) adopt a Loctite adhesive of the installation, which measures demand for copper coat we have an outer diameter of the outer groove; (c) cylinders hole tapping, threading copper sleeve outer diameter after coating Loctite glue, screw installation.

(2) melting contact information and a copper cylinder sleeve, the correction method is as follows:

(A) selection of ground rods, craft or mechanical way cylinder bore polishing amended; (b) the choice of coordinate boring, boring the cylinder hole scratch; (c) Selection Reamer correction cylinder bore.

(3) selection of "look engineering skills" approach as follows: