Therefore, the repair of the crack of the repairing shell of the gear oil pump casing can be repaired by the cast 508 nickel-copper welding rod. After welding, the weld is required to be tight and free of air holes, and the flatness of the surface combined with the pump cover should be no more than 0.05mm. After the drive shaft bushing hole and the driven shaft hole are worn, the repair drive shaft bushing hole is worn, and the reaming method is adopted to eliminate The wear marks are then matched with the correspondingly enlarged bushings; the driven shaft holes are worn and the reaming method is also used to eliminate the wear marks. Then, according to the actual size of the reamed hole, a driven shaft with an increased diameter is prepared.
Repairs after the inner cavity of the pump casing are worn are generally repaired by the inner cavity ring. After the inner cavity is enlarged, the cast iron or steel insert is prepared.
After the ring is set, the inner cavity is then smashed to the required standard size, and the portion of the ring exposed at the end face is worn away to make it flush with the plane of the pump casing.
U) Repair after the seat is worn After the spherical pressure limiting valve seat is worn, the steel ball can be placed on the valve seat, and then the copper ball is gently tapped with a metal rod several times until the ball valve is in close contact with the valve seat. If the seat is worn more seriously, it can be first removed by reaming. Then use the above method to make it close. For the plunger type pressure limiting valve, the valve grinding paste can be used for mutual research until the sealing performance is restored.
Repair of the gear type oil pump pump cover tl) Repair of the pump cover working plane After the wear of the pump cover working plane exceeds 0.1 mm, it should be repaired. When the working plane of the pump cover is less worn, the pump cover can be placed on a flat plate or a thick glass plate, and a valve polishing paste is applied between the working plane of the pump cover and the flat surface for grinding until the wear marks are eliminated.
When the amount of wear is large and severely uneven, the method of grinding after turning first should be used.
(2) Repair after the drive shaft bushing hole is worn The repair after the wear of the drive shaft bushing hole on the pump cover is the same as that after the wear of the drive shaft bushing hole on the housing.
躜 鹞黢 鹞黢 é’Œ é’Œ é’Œ é’Œ é’Œ é’Œ é’Œ è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ† è¿žæ†Once the connecting rod bolt is broken, the piston and the crankshaft may be broken or deformed, and the cylinder head, the body, the fuel tank, the water tank and the like may be damaged. therefore. It is very important to prevent bolt breakage. The measures are: 1. Strictly control the quality. The new bolts shall be strictly inspected according to the drawings and technical requirements. If the used bolts are found to have defects such as tensile, bending, twisting, thread damage, cracks, etc., they shall not be used any more, and other bolts may not be used instead.
*2. The pre-tightening force should meet the requirements. Pre-tightening bolts must be tightened to the specified torque with a force wrench in several times and at right and left. Do not over-tighten or loosen, and should not be tight. If the torque is too large, the bolt is elongated and the thread is slippery; the torque is too small. The bolts are easy to loosen.
Ensure the verticality of the bolt installation. The connecting bolts and nuts should be mounted on the bearing surfaces to be parallel to each other.
4. Insurance or self-locking devices are indispensable. When the tightened connecting rod bolts and nuts loosen, the pre-tightening force of the bolts will change (decrease). In order to maintain the specified pre-tightening force, the insurance or self-locking device must be effective and reliable, and it is indispensable.
Do not miss the positioning sleeve (pin). When the connecting rod of the oblique cut is stretched by the inertial force, a component force acts on the connecting rod bolt in the direction of the slit, so that the connecting rod bolt is subjected to the shearing force. In order to offset the effect of the shear force on the bolt, the positioning sleeve (pin) is used for positioning. In the assembly, the positioning sleeve (pin) must not be missed, and the joint surface is clean, burr-free and tightly fitted.
Replace the bearing pads in time. If the bearing bush clearance is too large, the diesel engine will run unevenly and there will be an impact phenomenon. The bearing bush should be replaced in time to prevent the occurrence of alternating stress and cause the bolt to break.
Change parts on time. The connecting rod bolts are too long to be fatigue-fractured. Generally, about 60007000h should be used for preventive replacement to avoid the occurrence of broken bolt accidents.
reed.
The movement is not normal (1) The impeller is idling but the nozzle is not rotating. Main reasons: 1 The coupling bolt between the impeller shaft and the small worm wheel is loose or the pin is loose, and should be tightened; the positioning bolt between the 2 large worm gear and the sleeve shaft should be loosened and tightened. 3 The reversing teeth slide out. The reversing lever should be pulled to engage the gears.
(2) The water tongue is normal but the impeller does not turn and the spray body does not turn. The main reason: 1 worm gear or gear lacks oil, causing excessive resistance, should be added with lubricating oil; 2 the positioning bolt is tightened too tightly, causing the worm gear to be eccentric, should be properly loosened; 3 the impeller is stuck by foreign matter, should be removed; 4 worm wheel, gear or hollow shaft and sleeve shaft rust, should be rusted and refueled and installed.
If the sealing surface is not sealed, the hollow shaft should be removed and cleaned.
The nozzle processing accuracy is not enough. The hollow shaft and the end face of the sleeve shaft cannot be closed. Should be repaired or replaced.
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