30. Main Pump Inspection

Main Pump Inspection





Important:
^ Make the measurements described below at several locations.
^ Replace the main pump body. driven gear and drive gear if any of the following specifications are not met.

1. Measure the depth of the main pump body gear cavity at dimension A.
Gear Cavity Depth
The maximum depth of the gear cavity is 24.940 mm (0.9819 inch).





2. Measure the ID of the main pump body gear cavity at dimension A.
Gear Cavity ID
The maximum ID of the gear cavity is 109.191 mm (4.2989 inch).





3. Measure the OD of the driven gear at dimension A.
Driven Gear OD
The minimum OD of the driven gear is 108.987 mm (4.2908 inch).





4. Measure the distance between the flats of the drive gear at dimension A.
Drive Gear Flat Measurement
The maximum distance between the flats is 52.165 mm (2.0537 inch).





5. Align drive gear (1) and driven gear (2) with the main pump so that their punch marks are in the same position as when they were originally removed.
6. Install the gears into main pump body (3).





7. Measure the clearance between driven gear (1) and main pump body (2), driven gear diametrical clearance.
Driven Gear Diametrical Clearance
The maximum driven gear diametrical clearance is 0.20 mm (0.0080 inch).





8. Measure the clearance between driven gear (1) and main pump body crescent (2).
Driven Gear/Crescent Clearance
The maximum Driven Gear/Crescent Clearance is 0.455 mm (0.0179 inch).





9. Hold a straight edge across main pump body (1) and drive gear (3). Measure the clearance between the drive gear and the straight edge. This is the drive gear side clearance.
Drive Gear Side Clearance
The maximum drive gear side clearance is 0.066 mm (0.0026 inch).
10. Hold a straight edge across main pump body (1) and driven gear (2). Measure the clearance between the driven gear and the straight edge.
Driven Gear Side Clearance
The maximum driven gear side clearance is 0.050 mm (0.0022 inch).





11. Remove drive gear (1) and driven gear (2) from main pump body (3).