OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

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pipe plug 206701-6, and the screw 196780-4 from the pump head
274302-1. Next remove the pump head mounting screws 206701-(
and 271730-12, and the pump head 274302-1 can be removed. The
valve plate 274299-5, the cylinder block 274299-1, and the
universal link assembly can be lifted out. The pump shaft
274300-1 with the pistons and bearings assembled can now be
lifted out. Next remove thepintles 274298-3 from the end of
the pump housing and the pump yoke 274301-1 can be removed.
129. T9 dismantle the pump shaft. - First remove the
screws 271678-4 from the piston rod retainers 271692-4. Make
sure that these parts are marked to insure reassembly in the
same location. The piston rods 271690-4 can now be removeCi
from the shaft. The pistons are further dismantled by straightening
out the lock washers 271691-4, and then removing the
bearing retainers 271690-3. Thebearings 274337-16 and 274337-15
are next to be removed. 'Bearing 274337-16 is a light push fit
on shaft 274300-1, and can be removed easily by tapping on the
edge of the inner race of the bearing. The bearing 274337-15
is a press fit on the shaft 274300-1, and can be removed only
by inserting pins of equal length in the 3/8" diameter holes
in the piston rod bores in the shaft, after the piston rod
bearings 271691-6, have been removed. The shaft and 'pins are
to be placed under a press and the bearing 274337-15 forced
off. When installing a new bearing 274337-15, the new bearing
is to be heated in an oil bath to a temperature of 175 0 F. and
is to be assembled quickly on to the shaft, before the bearing
cools. The bearing support on the shaft 274300-1 is to be
coated with "Micronized Graphite", a product of the Dixon
Graphi te Co. to permit easy disassembly of the bearing. The
spring retainer 271692-2 can next be removed by loosening the
locking screw 220718-1 from the shaft, and removing the universal
link retainer 271692-5. The cylinder bearing ,pin
274296-5 can be removed from the cylinder block by tapping
lightly on the end of the shaft, which will drive out the universal
link retainer 271691-3.
130. To reassemble the A-end J all parts are to be washed
in a non-acid cleaning fluid, to insure cleanliness, and
the parts are to be reassembled by reversing the dismantling
procedure. When assembling the pistons in to the cylinder
block, the pump yoke is to be tilted to one side, and the pistons
and the universal link are to be fed in to their bores
one at a time. All moving parts are to be checked to be free
from bind. When assembling newoversize pistons into a worn
cylinder block, the cylinder bores are to be remachined to
make the bores true and round. The O'.fOlOoversize pistons are
to be ground and polished to fit the bores with a clearance
tolerance of .0008 to .0014 inches.
131. Tor em0 vet her e p l en ish i nf!j, c ti e c k val v e s ( dr. no .
274284). - It is not necessary to remove these assemblies for