1 / 14

Hydraulic Pumps

Hydraulic Pumps. Operation and Inspection. Gear Pumps. Designed using 2 gears Fluid is forced around the outside of the gears Positive displacement type Most inefficient Rugged design. Gear Pump Identification. Has 2 shafts, 1 exposed and the other hidden

tola
Télécharger la présentation

Hydraulic Pumps

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hydraulic Pumps Operation and Inspection

  2. Gear Pumps • Designed using 2 gears • Fluid is forced around the outside of the gears • Positive displacement type • Most inefficient • Rugged design

  3. Gear Pump Identification • Has 2 shafts, 1 exposed and the other hidden • Drive shaft off center of the housing

  4. Gear Pump Inspection • Measure distance between end plates (wear plates) and gears • Measure distance between gears and housing • Measure distance between gear teeth (backlash) • Visual inspection of gears

  5. Vane Pump • Uses a rotor with several sliding vanes inside to pressurize the fluid • Rides on a cam ring • Rotation can be reversed by flipping the cam ring over • Inlet and outlet in the rear housing

  6. Vane Pump Identification • Is usually square housing • Shaft is in the center of the housing

  7. Vane Pump Inspection • Distance between rotor and end plate • Distance between rotor and front plate • Clearance of vanes in rotor • Wear patterns on cam ring

  8. Piston Pumps • Uses a round cylinder housing with cylinders in it to pressurize the fluid • Each cylinder has a piston • Each piston is connected to a swash plate

  9. Piston Pump Operation

  10. Piston Pump Operation • Most piston pumps have a swash plate that can be moved, which varies the amount of fluid pumped each revolution

  11. Piston Pump Identification • May be round or square • Can be determined by identification tag • Most piston pumps require 2 filters • Usually have a small line (case drain) attached to the outside of the pump

  12. Piston Pump Inspection • Piston to cylinder clearance is tight (.001 - .002) to increase efficiency • Scoring in the bore indicates the pump is ruined • Sealing surfaces on the rear of the rotating cylinder must seat properly with no scoring

  13. Piston Pump Inspection • Shaft bearings can go bad and will ruin the shaft • Shaft seals need to be pliable

  14. Other Piston Pumps • John Deere uses a radial piston pump where the cylinder housing does not move • Around the outside of the housing are pistons that are moved up by a cam • This type is used on a closed center system

More Related