Contents and methods of repairable hydraulic pump and motor
Contents and methods of repairable hydraulic pump and motor
The repairable contents and methods of hydraulic pump and motor are shown in the table below.
Contents and methods of repairable hydraulic pump and motor
|
Pump and motor structure |
Repairable content |
Repair method |
|
Gear pump and gear motor |
The wear between the two sides of the gear and the pump cover, and the axial fit clearance is about 30% larger than the value specified in the product drawing (the table below) |
grind |
|
Failure of shaft seal or other seals |
Replace the seal |
|
|
The volumetric efficiency is reduced to 10% - 15% |
overhaul |
|
|
Vane pump and vane motor |
The inner surface of stator ring is worn or streaked, causing vibration and noise |
Use special grinding machine or whetstone for grinding |
|
Some blades are worn, glued and broken |
Grinding or replacement |
|
|
There are scratches, wear points and metal gluing on the rotor side |
Repair and research to make the fit clearance of rotor and blade reach the specified value (table below) |
|
|
Failure of shaft seal or other seals |
Replace the seal |
|
|
The volumetric efficiency is reduced to 10% - 15% |
overhaul |
|
|
Piston pump and piston motor |
The plunger and cylinder bore are worn, and the clearance is 10% - 15% larger than the specified value (table below) |
The plunger was remade and the hole was repaired to make the clearance reach the specified value |
|
The valve plate is worn or streaked |
Grinding repair |
|
|
There are scratches or wear on the rotor end face |
Grinding repair |
|
|
The control spring force of variable displacement pump is insufficient, which affects the performance of variable displacement pump |
Replace the spring |
|
|
The valve core and valve body hole of variable control valve are worn, and the clearance is 10% - 20% larger than the specified value (table below) |
Remake the valve core and repair the hole to make the clearance reach the specified value |
|
|
Failure of shaft seal or other seals |
Replace the seal |
|
|
The volumetric efficiency is reduced to 10% - 15% |
overhaul |
Fit clearance of some parts of hydraulic pump and hydraulic motor (for maintenance)
|
Name and position of hydraulic components |
Fit clearance / mm |
|
Name and position of hydraulic components |
Fit clearance / mm |
||
|
Medium and low pressure gear pump |
Axial clearance between addendum circle and bore in housing |
0.05～0.10 0.04～0.08 |
中低压叶片泵 |
叶片与转子槽 叶片与配流盘 转子与配流盘（轴向） |
0.02～0.03 0.01～0.03 0.02～0.04 |
|
|
中高压齿轮泵 |
齿顶圆与壳体内孔轴向间隙 |
0.05～0.10 0.03～0.05 |
柱塞泵 |
柱塞与缸体上的柱塞孔 配流盘与缸体之间（轴向） |
d≤12 0.01～0.02 d≤20 0.015～0.03 d≤35 0.02～0.04 0.01～0.02 |
|
