GEAR PUMPS

Construction

This type of pump has a drive gear and a driven gear.  The drive gear is used to drive the driven gear. Both gears are installed at the maximum clearance of 0.002” in the housing. The drive gear has a shaft that is connected directly to the motor. Gear pumps designed for operating at high pressure usually have floating wear plates on each side of the gears.  Both plates located at the pump’s inlet function to reduce slippages and increase the pump’s efficiency.

Gear pumps are available in single-gear and double-gear models.  The arrangement of elements of single gear and double gear models are shown hereinafter.

TYRONE HYDRAULIC PUMP TYPE AND MODEL IDENTIFICATION

Double Section Gear Pump

UNIDIRECTIONAL

  1. Flange
  2. Front Housing
  3. Center Bearing Plate
  4. Rear Housing
  5. Rear Idler
  6. Front idler
  7. Rear Idler
  8. Front Drive Gear
  9. Coupling
  10. Stud (8 each)
  11. O-ring located on the back of the flange and on both sides of the center bearing plate
Reversible

A reversibel double section gear pump needs the following additions and changes:

  1. The flange that has two (2) threaded bores, each having a check valve.
  2. The isolation plate used in a reversible pump is different from that used in a unidirectional pump.
  3. The pressure plate used in a reversible pump is different from that used in a unidirectional pump.

The three items are the key factors that determine the performance of both reversible and unidirectional pumps.

IDENTIFICATON OF PARTS

SINGLE SECTION GEAR PUMP

UNDIRECTIONAL

  1. Retainer
  2. Sealing Strip
  3. Back-up Ring
  4. Isolation Plate
  5. Drive Gear
  6. Idler Gear
  7. Housing
  8. Flange
  9. O-ring
  10. Support Ring
  11. Pressure Plate

REVERSIBLE

  1. O-ring
  2. Flange
  3. Idler Gear
  4. Housing
  5. Drive Gear
  6. Isolation Plate
  7. Support Ring
  8. Retainer
  9. Pressure Plate
  10. O-ring
  11. Back-up Ring

 

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