ATF Pump Inspection

Lubricate the ATF pump drive gear (A), the ATF pump driven gear (B), and the ATF pump driven gear shaft (C) with ATF, then install them in the main valve body (D). Install the ATF pump driven gear with its grooved and chamfered side facing up.

Fig 1: Identifying ATF Pump Drive Gear, ATF Pump Driven Gear, ATF Pump Driven Gear Shaft And Main Valve Body
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the side clearance of the ATF pump drive gear (A) and the ATF pump driven gear (B).
ATF Pump Gears Side (Radial) Clearance

Standard (New):

ATF Pump Drive Gear

0.210 - 0.265 mm (0.009 - 0.010 in)

ATF Pump Driven Gear

0.070 - 0.125 mm (0.003 - 0.004 in)

Fig 2: Measuring Side Clearance Of ATF Pump Drive Gear And ATF Pump Driven Gear
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the ATF pump driven gear shaft. Measure the thrust clearance between the ATF pump drive gear (A) and the main valve body (B), and between the ATF pump driven gear (C) and the main valve body using a straight edge (D) and a feeler gauge (E).
ATF Pump Drive/Driven Gear Thrust (Axial)

Clearance

Standard (New): 0.04 - 0.07 mm (0.002 - 0.002 in)

Service Limit: 0.07 mm (0.002 in)

Fig 3: Identifying ATF Pump Drive And Driven Gear, Main Valve Body, Straight Edge And Feeler Gauge
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the measurements are out of the standards, replace the main valve body assembly.