Gear pump assembly

After repairing the gear pump, the following must be noted when assembling:

1. Deburr the parts to remove the burrs, the sharp edges of the gear with whiffstone blunt, but can not be rounded, after the flat-ground parts to demagnetization, all parts must be carefully cleaned with kerosene before assembly;

2. CB-B gear pump axial intermittent control by the gear and pump body directly. Pump body thickness is generally 0.02-0.03mm thicker than the width of the teeth, generally should not be added between the pump and the front and rear cover paper pad, resulting in the axial Intermittently large, volumetric efficiency is reduced. Intermittent too small is easy to heat, mechanical efficiency is reduced;

3. CB-B gear pump front cover mounted on the long axis of the oil seal, the outer end should be flush with the flange, not too deep into, so as not to plug the leak channel, resulting in trapped oil, resulting in leakage at the seal;

4. CB-B gear pump two positioning pin hole, the general hydraulic factory as a processing process reference. Gear pump in the maintenance of the assembly, if the pump body before and after the cover of three parts into the positioning pin, and then tighten the six pressure Tightening screws often cause gear problems. The correct method is to first tighten the six compression screws across the corners, and then use the hand to rotate the long axis. If there is no difference between the weights, the rotation is flexible and the two hinges are used. Hole, enter the positioning pin;

5.CB-B gear pump is easy to install, must pay special attention, otherwise not suck oil, it is easy to overturn the skeleton oil seal;

6. The needle roller bearing needle diameter tolerance can not exceed 0.003mm, length tolerance 0.1mm, roller bearings must be filled with bearing rings;

7. After the gear pump is assembled, it shall be tested according to the project of JB/JQ20104-88 and JB/JQ20102-88 Gear Pump Test Method.