TM 5-3810-300-24 & P2
The following parts should be replaced at every major overhaul: Wear Plate (10), Thrust Plate (22), Fiber Heat Shield (9),
Paper Gasket (8), "V" Seal (6), and 0- Rings (11). The shaft seal (1) should be replaced only when necessary.
All parts must be thoroughly cleaned prior to reassembly by dipping in solvent and brushing to remove all traces of
Install shaft seal (1), if it was removed, in front cover with the spring loaded lip facing inward. Force seal into place,
using a flat steel rod slightly smaller in diameter than the O.D. of the seal. This will permit the tool to enter the seal
recess and bottom the rotary seal on the stop. (The front cover (5) must be backed up on a smooth, clean surface to
prevent damaging its face).
The load to force seal into place should be applied exactly in line with the housing seal bore to prevent bending the seal
steel retainer, and/or scoring the seal housing bore.
Install the "V" Seal (6), the gasket (8), and heat shield (9) into the front cover cavity as follows: The small vent hole
through all of these parts shall be in line and positioned next to the scribe mark on the island previously made during
disassembly. This position locates the vent holes on the outlet side of the pump.
The lips on the V seal shall face toward the cavity and be tucked into the groove with the aid of a dull tool to prevent
damage to the rubber surface.
A small screw driver can be used.
The gasket shall be pressed firmly toward the bottom of the cavity with the thumbs so as to insure all of its perimeters are
completely within the groove to avoid interference with subsequent assembly.
The heat shield shall be firmly pressed toward the bottom of the cavity with the thumbs to provide sufficient spacer for the
Install o-ring (11) into the groove provided in front cover face. Oil the o-ring and stretch it slightly, if necessary, so
that it will remain in its groove.
Install the wear plate (10) with the bronze surface against the gears and the small vent hole in line with the hole in
the heat shield. Press the wear plate. The wear plate shall be sufficiently within the oval cavity so that it is axially
Install drive gear (13) and driven gear (14) assemblies into the front cover. Apply oil to the shaft at the drive end to
prevent damage to the shaft seal caused by sharp edges on the drive shaft passing through the shaft seal. An oil
coated shaft, rotated slowly, will usually cause no damage to the seal. Check to see that the shaft seal lip and spring
is not pushed out by the shaft.
Check wear plate to insure it is still seated into its oval cavity and install the center section (12) over the gears until it
engages the wear plate. Center