The main cause of leakage at the seal of small hydraulic pumps is damage and aging of the sealing ring. The leaking part should be specifically inspected, the sealing parts should be disassembled, the damaged parts of the O-ring and skeleton oil seal should be carefully inspected, and the scratches, bumps, burrs, etc. of the mating parts should be carefully inspected, and the sealing ring should be repaired and replaced with a new one.
1. There is leakage at the pump seal of the small hydraulic machine and leakage at the oil seal of the shaft end frame. The reasons are:
①Skeleton oil seal wear
② The coaxiality error of the pump shaft and motor shaft installation exceeds the accuracy specified in the instruction manual.
③The oil pump and the motor are based on the same foundation, and the connection support or flange is not rigid enough.
④Rotating shaft wear
⑤The internal leakage of the oil pump increases, the oil pressure in the low-pressure chamber exceeds 0.049MPa, and the skeleton oil seal is damaged.
2.Small hydraulic machine pump seal leakage and O-ring seal leakage:
① Leakage at the connection between the variable housing (end cover) and the spring housing:
a. Leakage at the seal of the small hydraulic machine pump and aging of the o-shaped sealing ring
b. Fitting parts, such as lead-in angles, groove scratches, bumps, and unevenness, causing damage to the trimmed edges of the seal.
c. Dirt, welding slag, iron filings and other debris in the oil tank are not cleaned up and the hydraulic oil flows into the sealing part during operation, damaging the sealing ring.
② Leakage at the O-ring seals such as the upper and lower flanges, tie rods, head caps, and shaft end flanges of the transformer housing
③ Leakage from the upper flange of the variable housing of YCY14-1B pump:
a. The sealing green shell paper pad of the small hydraulic press is damaged
b. Increased wear of the spring core shaft and large leakage
c. The flange surface is uneven ① Replace the skeleton oil seal ② Recalibrate the coaxiality as required and reach the specified accuracy ③ Use H-foundation for the pump and motor, replace the support or flange
④Slight wear can be corrected with sandpaper and whetstone, serious eccentric wear should be returned to the manufacturer) to replace the drive shaft.
⑤ Repair two pairs of S-moving parts on a small hydraulic machine and replace the bracket oil seal. Use special tools when assembling the oil seal. It is not allowed to knock the oil seal with a hand. The lip should be towards the E-oil side to ensure sealing. ① Replace the O-ring seal a. Have experienced workers and technicians disassemble the variable M housing (to avoid the variable head falling off and being damaged), and replace the ◦-shaped sealing ring. b. Correct the scratched and frayed parts. Replace with new sealing chamber. When tightening the screws, tighten them symmetrically and evenly to prevent the sealing ring from cutting. c. Clean the fuel tank, filter the hydraulic oil and seal the fuel tank strictly according to the instructions. Replace the sealing ring. ② Disassemble the sealing position. The processing method is the same as a and b in ①. , Item c a. Replace the green shell paper pad b. Replace the elastic yellow mandrel, with a matching clearance of 0.006~0. 01 mm c. Grind the flange plane
