Tag: kcb

Poor rotation

① The axial clearance or radial clearance is too small.
To adjust and repair.
 
② there is dirt in kcb gear pump.
Disintegrate to remove foreign matter.
 If impurities are required, We recommend to select aodd pump.

③ The assembly is wrong.
Gear pump two pin hole processing datum level is not the assembly datum, such as the pin into the first, and then tighten the screws, the pump will not move.
The correct way is to turn the gear pump while tightening the screws, after the last drill pin hole and into the pin.
 
④ Coaxiality difference between pump and engine jaw flexible coupling.
Coaxiality should be within 0.1mm.
 
The pump parts are not demagnetized.
All parts must be demagnetized before assembly.
 
⑥ The quality of the needle sleeve is unqualified or the needle sleeve is broken.
Repair or replace.
 
The working oil outlet is blocked.
Remove foreign body.

Insufficient output flow

(1) The high oil temperature will decrease the viscosity, increase the internal leakage, and reduce the output flow of the pump.
The cause should be identified and measures taken;
For middle and high pressure gear pump, it is necessary to check whether the sealing ring is damaged.
 
(2) the selection of oil viscosity is too high or too low, will cause the output flow of the pump to reduce, should use viscosity qualified oil.
 
(3) CB-B type gear pump generally can not be reversed, such as the pump body installed against, will cause the pressure oil chamber and oil suction chamber local short connection, so that the flow is reduced or even can not absorb oil.
At this point, you should check the steering of the pump.
 
④ The engine speed is not enough, resulting in reduced flow.
The cause should be identified and ruled out.

Elimination of common vibration and noise faults of high temperature gear pump:

(1) Mechanical reasons
 
The connection between the pump and the coupling is caused by vibration and noise due to non-compliance with the specified requirements.
The coupling shall be adjusted according to the specified requirements.
 
② Due to the dirt in the oil into the pump, gear and other components wear and tear and produce noise.
Should replace the oil, strengthen the filtration, open the pump to clean;
If the gear is badly worn, it must be repaired or replaced.
 
(3) pump parts damage or wear will produce serious vibration and noise: such as tooth shape error or circumference error,
 
The two gears are in bad contact, the tooth surface roughness is high, the common normal length is out of tolerance, the tooth backlash is too small, and the contact area of the two meshing gears is not in the position of the dividing circle.
At this time, the gear can be replaced or the gear grinding.
At the same time, the needle cage of the bearing is damaged, the journal of the long and short shaft and the needle roller is worn, which can lead to the mechanical noise caused by the poor rotation of the bearing. At this time, the gear pump needs to be removed and repaired and the needle roller bearing needs to be replaced.
 
(4) the gear axial assembly clearance is too small;
The sliding joint surface between the gear end face and the front and rear end cover was not carefully removed because of the burr before the gear assembly, which caused the joint surface to be pulled during operation, resulting in large internal leakage and reduced output flow.
Dirt enters the pump and wedges into the gap between the end face of the gear and the front and rear end cover, causing the high and low pressure cavities to be connected due to radial pull grooves, so that the output flow is reduced.
The following measures should be adopted to repair the above situations.
Disassemble the gear pump, appropriately increase the axial clearance that is to grind the end face of the gear;
Flat the front and rear cover end faces and gear end faces with a surface grinder, and remove the burr on the gear teeth (can not chamfer);
After plane grinding, the depth dimension of the unloading groove on the end face of the front and rear end cover will change, and the width should be increased appropriately.
 
(2) The high viscosity of the oil will also produce noise, so the oil with appropriate viscosity must be selected.

The fever

(1) The reasons for the poor rotation of the gear pump can lead to the heat of the gear pump, and the elimination method can also refer to its implementation.
 
② The oil viscosity is too high or too low.
Reselect the oil.
 
③ Serious friction between side plate, shaft sleeve and gear end face.
Repair or replace.
 
High ambient temperature, small tank volume, poor heat dissipation, will make the pump heat.
Should be dealt with separately.

Repair of main parts

(1) gear
(1) tooth repair: use fine abrasive cloth or whetstone to remove the strain or has been ground into the prism parts, and then the gear meshing surface change orientation and properly on the grind, after cleaning;
Severe wear and tear that can be observed with naked eyes should be replaced.
 
(2) end face repair: the end face of the gear and the bearing seat or front and rear cover relative rotation and wear, light when the line, can be used to grind the burr marks of the line and polishing;
When the wear is serious, the gear should be put on a surface grinder for grinding.
Note: Both gears must be laid flat at the same time.
 
I believe that we have mastered the maintenance method of the common sudden failure of the gear pump in the future to encounter some sudden situations can be easily resolved.
If the problem still exists after the maintenance of the above method, it should be repaired by professional maintenance personnel in time, and do not ignore it, so as not to cause unnecessary losses.

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