MSI QI-1000, Technical Manual, Page: 49 / 56

7.00 Gear Reducer Repair Procedures
Due to the complexity of the task and the need for special tools and training, MSI does not recommend
the complete disassembly of the Gear Reducer in the field. If extensive Gear Reducer repairs are
required, the pump should be returned to the Dixie Iron Works, Ltd. where expert service can be
obtained on an expedited emergency basis if needed. When field repairs are required, they should be
performed in a clean well equipped shop by a trained well service pump technician.
7.10 Removing and Disassembling the Gear Reducer
The Gear Reducer assembly may be removed from the Power Frame without being disassembled by
using a 1-7/16” wrench to remove the eight 7/8” hex nuts, which secure the Gear Reducer to the Power
Frame. MSI highly recommends removing the Gear Reducer intact when at all possible. When Gear
Reducer internal repairs are required, follow the procedure below to inspect or replace the bull gear,
pinion shaft, or roller bearings:
a. Remove the unit’s mechanical driveline from the pump’s input shaft.
b. Remove the lubrication hoses from the Gear Reducer and remove the Gear Reducer as a complete
assembly from the Power Frame. Lay the Gear Reducer down on its mounting flange face with the
input shaft facing up.
c. Using a 1 ½” wrench, remove the 1” cap screw which secures the companion flange to the input shaft.
Remove the companion flange and inspect it for wear.
d. Using a ¾” wrench, remove the eight ½” cap screws, which hold the pinion seal retainer to the Gear
Reducer housing. Remove the pinion seal retainer and shims from the Gear Reducer, remove the oil
seal from the retainer, and scrape all old silicone sealer from the retainer.
e. Using a punch and hammer, drive the three ½” dowel pins from the outer flange of the Gear Reducer
housing. Using a ¾” wrench, remove the nineteen ½” cap screws, nuts, and washers, which secure the
Gear Reducer, cover plate to the housing. Remove the eight ½” cap screws which secure the bearing
cover to the Gear Reducer. Remove the bearing cover and shims. Lift the cover plate away. Scrape all
old silicone sealer from the Gear Reducer cover and from the flange on the housing. Using a brass
punch and hammer, drive both bearing cups (outer races) from the cover plate and inspect them for
wear or damage.
f. Remove the bull gear from the pump and inspect the gear teeth and both tapered roller bearing cones
for wear and damage.
g. Remove the pinion shaft from the Gear Reducer and inspect both tapered roller bearing cones for wear
and damage. If the bearing needs to be removed from the shaft, do so by carefully heating them with
an acetylene torch until they will slip off the shaft. Care must be taken to avoid overheating the shaft
itself. Inspect the shaft for wear and damage to the gear teeth, and bearing journals.
h. Using a ¾” wrench, remove the eight ½” cap screws which hold the rear pinion-bearing cap on the
Gear Reducer housing. Remove the bearing cap and scrape all old silicone sealer from it.
i. Turn the Gear Reducer housing over on the opposite face. Using a brass punch and hammer, drive the
tapered roller bearing cups (outer races) out of the Gear Reducer housing and inspect them for wear and
damage.
j. Reassembly of the Gear Reducer should be performed in the reverse order of the disassembly
instructions above. Installation of new tapered roller bearing cones on the pinion shaft or bull gear can
be performed by pressing them on or by heating the cone assembly through any one of several
methods. A temperature controlled heating plate, hot oil bath unit, hot air cabinet, or induction heating