ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 860

1. Drain oil from gear case by removing drain plug (2).
2. Remove the socket head bolts (5) from the gear cover (3).
3. Remove the gear cover from the gear headplate.
MARK ALL PARTS WITH A CENTER PUNCH SO THEY CAN BE REASSEMBLED IN THE SAME POSITION
(IMPELLERS, HEADPLATES, AND GEARS).
4. If the timing gears appear undamaged, the gear backlash must be checked to see if the gears can be
salvaged.
A. Mount a magnetic base dial indicator on the gear headplate (see FIGURE 6-1).
B. Lock one impeller stationary by wedging a feeler gauge between the impeller and the headplate.
C. The tip of the indicator should be placed at the center of the contact surface on a tooth of the gear on
the free shaft.
D. Rock the impeller back and forth by hand and read the total rotational movement to the nearest .0005
inches. Do this at four gear mesh positions 90 degrees apart.
E. Permissible gear backlash is shown below.
GEAR DIA. GEAR BACKLASH
3" .0015 - .0025
4" .0015 - .0025
5" .002 - .003
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