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19-26
STEERING
3
Fig. 2-Pressure
Test
1..e shut-off valve, all connections must
be
tig .t
and shut-off valve fully open.
(3) Remove the pump reservoir filler cap.
(4)
Connect one lead of the tachometer to the dis-
tributor terminal of coil, the other lead to a good
ground, start the engine and operate at 500 rpm and
fill
pump reservoir to the proper level.
(5)
Expel all air from the unit by turning the steer-
ing wheel to the full right turn and back to the full
left turn several times and recheck oil level. To as-
sist in heating the pump oil: slowly turn the pres-
sure gauge valve towards the closed position until
gauge reads
400
psi and open valve fully when oil
temperature reached 150 degrees F.
(6) With the engine operating at idle speed (500
rpm) and no steering effort applied, and oil tempera-
ture between 150 degrees F. and 170 degrees F. test
Fig. 3-lesling
the Oil Temperature in the
Pump Reservoir
with a thermometer in reservoir,
as
shown in Figure
3; the pressure gauge should show a pressure of less
than 100 psi. If the pressure is higher, inspect the
hoses and connections for kinks and obstructions, or
restrictions in the steering gear.
(7) Increase the engine speed to 1000 rpm, then
slowly close the gauge shut-off valve. With the gauge
shut-off valve fully closed the pump pressure should
be as follows:
(a) (.96 displacement pump) AV1, AV2 models 750/
800 psi.
(b) (.96 displacement pump) AR1, AR2, AP1, AP2
models 950/1000 psi.
(c) (1.2 displacement pump) AP1, AP2, ARl, AR2
models 900/1000 psi.
For identification the
1.2 displacement pump has a
milled slot for machined hex in the end of the pulley
shaft. The .96 displacement pump does not have the
milled slot.
CAUTION:
Do
not close the valve for more than a
few seconds, as this would abnormally increase
the oil temperature and cause undue oil pump wear.
(8)
If the pressure increase to more than indicated,
the relief valve is faulty or the pump is equipped
with the wrong relief valve.
(9) If the pressure is less than that indicated above,
the relief valve is faulty. Replace the relief valve
with the correct relief valve known to be in working
order and repeat test. If the pressures are still below
specifications, disassemble the pump and inspect the
flow control valve for evidence of fouling, or slipper
spring breakage.
(10) With the gauge shut-off valve fully open, op-
erate the steering unit through another cycle, this
time holding the unit at extreme travel in each direc-
tion while watching the oil pressure gauge. The gauge
reading should be equal in each direction. If not, it
indicates excessive internal leakage in the steering
gear unit.
NOTE: Do not hold the wormshaft at either extreme
position for more than a few seconds.
(11) If the pressures are within the ranges specified;
make a flow test as outlined in "Pump Flow Test."
Pump Flow Test
(1) Inspect the pump belt tension. See "Cooling
System," Group 7.
(2) Disconnect the pump pressure hose at the pow-
e r steering pump and connect the test hose adapter
tube and pressure gauge C-3309B with the proper
adapters between the power steering pump and the
hose disconnected from the pump (refer to Fig.
4).
NOTE: The pressure gauge must be installed
be-
tween the pump and the shut-off valve, all connec-
tions must be tight and the shutoff valve fully
open.
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