Four commonly used gear pump repair and repair knowledge

First, the drive shaft and bushing after the repair of wear

Gear oil pump drive shaft and bushing wear, its fit clearance increases, will affect the pump oil.

In this case, the drive shaft or bushing method can be used to restore its normal fit clearance.

If the drive shaft wear is slight, you only need to press out the old bushing and replace it with the bushing of standard size, and the clearance can be restored to the allowable range.

If the drive shaft and bushing wear serious and with the clearance seriously exceed the standard, not only to replace the bushing, and the drive shaft is also applied chrome plating or vibration surfacing method to increase its diameter, and then grinding to the standard size, restore the requirements with the bushing.

Two, lubrication oil pump shell repair shell crack repair: shell crack can be cast 508 nickel copper electrode welding repair.

The weld seam must be close and the element porosity, and the flatness error of the joint surface with the pump cover is not greater than 0.05 mm.

Repair of wear of driving shaft bushing hole and driven shaft hole of KCB gear oil pump: after wear of driving shaft bushing hole, the wear trace can be eliminated by hinge method, and then the bushing increased to the corresponding size can be matched.

Driven shaft hole wear is also hinged to eliminate the wear trace, and then according to the actual size of the hole after the hinge preparation of driven shaft pump housing cavity repair: after the pump housing cavity wear, generally take the cavity insert method repair, that is, after the inner cavity is filled out with cast iron or steel bushing.

After inserting the sleeve, line the inner cavity to the required size, and grind off the bushing extending out of the end face, so that it is flush with the joint surface of the pump housing.

Repair of valve seat: there are two kinds of pressure limiting valve: ball valve and plunger valve.

After the ball seat is worn, a steel ball can be placed on the seat, and then gently hit the ball with a metal bar until the ball valve is tightly closed to the seat.

If the valve seat wear is serious, can be hinged to remove the wear marks, and then use the method to make it close.

After the plunger seat is worn, a little valve sand can be added for grinding until it is tight.

Three, the repair of the pump cover

Repair of the working plane: if the pump cover working plane wear is small, manual grinding method can be used to eliminate the wear trace, that is, put a little valve sand on the platform or thick glass plate, and then put the pump cover on the top of the grinding, until the wear trace is eliminated and the working surface is smooth.

When the pump cover surface wear depth of more than 0.1 mm, should take the first turning after grinding method to repair.

Active shaft bushing hole repair: the pump cover on the active shaft bushing hole wear repair and shell active shaft bushing hole wear repair method is the same.

Four, the use of gear turnover

Gear oil pump gear wear is mainly in the thick part of the tooth, and gear end face and tooth wear are relatively light.

Gear in the tooth thickness parts are unilateral wear, so the gear can be turned 180 degrees to use.

When the gear end face is worn, the end face can be ground flat, while grinding and lubricating the oil pump shell interface to ensure that the clearance between the gear end face and the pump cover is within the standard range.