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Page Title:
DESCRIPTION AND PRINCIPLES OF STEER AND HYDRAULIC PUMPS. |
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 f.
Install new O-ring on check valve
Each gear assembly is press fitted on
and place ball and check valve in valve
a separate precision ground and lapped
body recesses and hold valve against its
Retaining rings are installed
shaft.
port end mating surface, making sure
in grooves in these shafts to insure
the locating pin on the check valve en-
that gears will not move axially
gages the recessed hole to insure port
along the shaft.
alignment.
The drive shaft is keyed to the gear
Locate control ball stud housing
to provide positive drive and extends
g.
in desired position relative to control
thru the front cover to permit coupling
ball stud.
Install four capscrews while
the pump to an external driving means.
holding valve and control assembly in
place to prevent misalignment of O-rings.
A double lip shaft seal is proveded in
Tighten capscrews to porper torque.
the front cover to prevent external
(Refer to Specifications on page vii).
leakage of fluid and the seal lip in
contact with the fluid is spring loaded.
h.
Install control ball stud spacer.
Vent passages within the housing and
The spring washer must be installed with
driven shaft transmit pump inlet pres-
its convex (raised inside diameter) face
sures to the shaft seal area to insure
toward ball stud to provide spring ten-
lowest possible pressures at the seal
to extend seal service life.
sion on ball stud.
Next install ball
stud seats and control ball stud.
Posi-
tion the stud and sleeve so that the
A phenolic sheld, a paper composition
stud is centered in the sleeve opening.
gasket and molded rubber seal form
compartments behind a steel backed
i.
Tighten control ball stud sleeve
These compartments
bronze wear plate.
plug snugly against seat.
Back plug
are vented to either pump inlet or
off until slot in plug lines with one
discharge pressures.
Discharge pressure
of snap ring anchor holes in sleeve
within these compartments axially loads
which are spaced at 60 i n t e r v a l s i n
and deflects the wear plate toward the
control ball stud sleeve.
Install
gear faces to take up gear end clear-
hooked end in anchor hole and engage
ances.
This increases pump efficiency
snap ring in groove in sleeve plug.
by reducing internal leakage.
This can most easily be done by en-
gaging tang in hole in sleeve and then
Pump rotation is dependent on proper
applying pressure with small screwdriver
orientation of the heat shield, the
opposite tang on outside edge of snap
gasket and the seal in the front cover
ring.
with respect to the pump center section
Opposite pump rotation
and back cover.
5-117.
DESCRIPTION AND PRINCIPLES OF
may be achieved by rotating the heat
STEER AND HYDRAULIC PUMPS.
shield, the gasket, the seal, the wear
plate, the center section and the back
These gear type pumps consists of two
intermeshing hardened and precision
cover 180 degrees.
ground gear assemblies which are lapped
and enclosed in a three section housing
Pumping action is achieved by connecting
assembly consisting of a die cast alu-
the pump inlet port to an oil supply,
minum front cover, an intermediate
the outlet port to a discharge line and
(center) section made of high yield ex-
rotating the pump drive shaft in a
truded aluminum and a back cover assembly
direction which causes the gear teeth
Passages within this housing connect the
to rotate away form the pump inlet port.
intermeshing gears with the pump inlet
and outlet ports.
5-91
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