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 TM 55-1905-217-34
3-6. Fresh Water Pump
a. Removal. Remove fresh water pump (TM 55-1905-217-12, para 4-45).
b. Disassembly.
(1) Remove the pump cover and gasket (fig. 3-28).
(2) Support the pump on its mounting flange in an arbor press. Place a short steel rod on the shaft and
separate the shaft and bearing assembly from the impeller, seal and pump body.
(3) Remove the impeller and seal assembly from the pump body.
(4) If the steel insert is worn excessively, tap or press it out of the pump body.
(5) Remove the water slinger from the shaft.
(6) If the impeller was pinned to the shaft, use a punch and hammer, to remove the sheared tapered pin
from the shaft and impeller by tap- ping against the small end of the pin.
(7) If necessary, remove the pump drive coupling from the shaft using a steel rod clamped in a vise and
special tool J 1930.
c. Clean, Inspection and Repair.
(1) Clean all of the parts except the shaft and bearing assembly. The sealed type pump shaft bearing
must not be immersed in a cleaning fluid since dirt may be washed in and the fluid cannot be entirely removed.
(2) Revolve the pump shaft bearing slowly by hand. If rough spots are detected, replace the shaft and
bearing assembly.
(3) Examine the impeller for wear, and replace it if necessary.
(4) Examine the studs in the pump body. If it is necessary to replace a stud, use a good grade of
sealant on the threads and drive the stud in to 10-12 lb-ft torque.
(5) Replace all defective parts as necessary.
(6) Replace a water pump that is damaged beyond repair.
d. Reassembly.
(1) If a new steel insert is to be used in the pump body, make sure the counterbore in the pump body is
thoroughly clean before installing a new insert. Dirt in the counterbore can cause misalignment between the
insert and the carbon washer and result in a leak at this point. Start the counterbored end of the insert into the
pump body. Then, press the insert in until it contacts the shoulder in the pump body. The insert has a .0015
inch-.0035 inch press fit in the pump body.
CAUTION
Do not mar the highly finished seal contact surface of the insert when pressing it into the pump body.
(2) Install the slinger on the pump shaft with the flange of the slinger approximately 3/16 inch from the
end of the outer race of the bearing.
(3) Support the impeller end of the pump body on an arbor press, and insert the coupling end of the
shaft and bearing assembly into the pump body. Then, press against the outer race of the bearing until the
bearing contacts the shoulder in the pump body. Stake the end of the pump body in three places to prevent the
bearing from moving endwise.
(4) With the surface of the water pump seal clean and free from dirt and metallic particles, apply a thin
coat of liquid soap on the inside diameter of the rubber seal. Do not scratch or mar the surface of the carbon
seal washer. Slide the seal assembly on the pump shaft until the carbon seal washer is seated firmly against
the pump body insert. Then, install the spring with the small end toward the seal.
(5) Support the bearing end of the shaft (not the drive coupling) on the bed of an arbor press. Then,
press the impeller onto the shaft. The end of the shaft must be flush with the face of the impeller hub with the
bearing being held against the shoulder in the water pump body.
(6) Support the impeller end of the pump shaft on a suitable arbor and press the coupling onto the shaft.
The drive coupling must be flush with the end of the shaft. Make sure the drive coupling is tight on the shaft.
(7) Rotate the shaft by hand to be sure the rear face of the impeller blades do not rub the pump body.
(8) Place a new pump cover gasket against the bolting flange of the pump body. Slide the pump cover
over the studs and secure it to the pump body with four lock washers and nuts.
(9) If previously removed, install the drain cock in the pump body.
e. Installation. Install the fresh water pump (TM 55-1905-217-12, para 4-45).
3-7. Raw Water Pump
a. Removal. Remove the raw water pump (TM 55-1905-217-12, para 4-46). Although the raw water
pump installed in Hulls 8540 thru 8560 and 8580 thru 8618 is different from the one covered here, the
procedures are similar.
3-37
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