Rolls-Royce
Silver
Shadow
&
Bentley
T
Series
Workshop
Manual
C
Chapter
N
Section
N3
STEERING
PUMP
(Hobourn Eaton)
AND
HOSES
Overhaul
Steering pump-To remove
1. If the pump is to be dismantled or the pulley
removed from the pump, it is advisable to slacken the
pulley retaining setscrew while the pump is in position
and the belts are tight.
2.
Slacken the belt adjuster and remove the belts.
3.
Uslng a syringe draw off and discard the fluid
from the pump.
Note
When inserting a syringe take care not to
damage the filter support plate.
4.
Clean the area around the pump hose connec-
tions on the steering pump.
5. Disconnect the pump hoses and blank the end to
prevent fluid spillage and the ingress of dirt.
6. To completely drain the pump of fluid, place a
container under the discharge pipe and rotate the
steering pump by hand in the normal direction of
rotation.
7.
Remove the two nuts securing the pump mount-
ing bracket to the engine and remove the pump.
Steering pump-To test
If facilities exist, it is advisable to test the pump to
ensure that it is delivering the correct pressure and
flow.
Test data
Flow
2.2 gal. to 2.5 gal.
(10,OO litres to 11,36
litres) per minute at 3,000 (pump) r.p.m. and
50
lb/sq. in. to 60 lblsq. in. (3,515 kglsq. cm.
to 4,218
kg/sq. cm.).
Pressure Min.
1,000 lb/sq. in. (70,30 kg/sq.
cm.)
at
600 (pump)
r.p.m. at no fluid flow.
Max. 1,050
lb/sq. in. (73,82 kg/sq. cm.) at
3,000 (pump) r.p.m. at no fluid flow.
Note
The pump must not
be
held at full pres-
sure for more than 5 seconds during Rig
Testing.
If the steering pump is not delivering the correct
pressure and flow, check that the flow control valve
is not sticking.
If
the flow control valve is found to
be operating satisfactorily,. it will be necessary to
dismantle and inspect the pump.
Steering pump-To dismantle and inspect
For identification of detail components refer to
Figure
N7.
1. Thoroughly clean the exterior of the pump,
taking care that no foreign matter enters the inlet or
outlet ports.
2.
Clamp the pump mounting bracket in a vice
fitted with protective grips.
3.
Remove the reservoir cover. Lift off the spring
and filter retaining washer and withdraw the filter.
4.
Fit a
&
in. U.N.F. nut and setscrew to the centre
pedestal, tighten the nut and remove the pedestal.
5. If this method is unsuccessful, a pair of grips may
be used to remove the pedestal. Leave the bolt
screwed in and grip on that part of the pedestal to
which the bolt is fitted, otherwise it
will
collapse.
6. Remove any burrs caused by the grips otherwise
the filter retaining washer will not retain the filter in
position.
7.
Remove the filter support plate.
8.
Remove the setscrew and the
4
in. U.N.F.
blanking plug, then withdraw the clamp plate.
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