Hudson 63 1936, Mechanical Procedure Manual

Page: 235 / 333

SHOCK ABSORBERS
The shock absorbers are of the direct acting type. The unit in
general consists of a compression cylinder inside of a reservoir
cylinder attached to the axle while the piston rod and dust
shields are attached to the car frame. The oil seal is located at the
top of the reservoir cylinder above the level of the oil and is not
exposed to the pressure of the oil.
Two different designs have been used with variations in
design and control being made in each during the period of
production.
The Monroe Shock Absorber
This type is shown in Figure 1901 as it is used on 1935, 1936
and 1937 models and 1934 replacement units. The 1934 models
use a design wherein the piston and valve is a single assembly
and individual parts of the piston or valve are not replaceable.
The 1937 rear shock absorbers incorporate a valve, similar to
the piston valve, located in the bottom of the working cylinder
below the flapper valve and constant bleed hole.
On the compression stroke this valve stays closed until a
predetermined pressure is built up, thus improving the control of
the spring on the compression stroke. This valve as well as the
flapper assembly is staked into the bottom forging and is not
replaceable.
Refilling
Refilling and all other service operations on the shock ab-
sorber itself can be performed with J-745 repair kit shown in
Figure 1902.
1. Remove the unit from the car.
2. Clean all dirt from around filler plug and remove filler plug
and filler plug gasket.
3. Pump ALL old fluid out of the unit.
4. Clamp base of the unit in a vise with the filler hole up.
(Figure 1903.) Compress the unit and screw the filler cup into
the filler plug hole.
5. Pour the exact amount of Genuine Hudson Shock Ab-
sorber Fluid recommended into the Filler Cup.
6. Pull the shock absorber to the extended position, thereby
sucking in the fluid.
7. Make sure that all of the fluid has been sucked in, and then
reassemble the filler plug, using a new gasket. Always use new
Genuine Hudson Shock Absorber Fluid for refilling, and
make sure that no dirt enters the unit.
Service Operations
When checking for noise, make certain that all units and
brackets are bolted tightly to the frame and axle, and that the
shock absorber is not striking the frame or other parts. Rubber
Grommets and Rubber Cushions should be replaced if neces-
sary. If after these points are checked you still believe the
shock absorbers are noisy, it is very easy to tell if the noise is
actually in the shock absorbers by simply removing the units
and driving the car. If the noise is still audible, you of course
know that it is elsewhere than in the shock absorbers. Howev-
er, if the noise disappears during this test, refer to rebuilding.
CAUTION: When installing the rear units, be sure the
gravel shield, that is welded to the lower tube, is toward the
front of the car.
Replacing Rubber Grommet
If noise develops in the rubber grommets or the rubber
cushions these should be replaced. When replacing the cush-
ions, particular care should be taken in making sure that the
guide washer is replaced between the axle and the top of the
lower rubber cushion, so that the cushions will be kept in
proper alignment. If the fit of the rubber grommets or cushions
over the pins is tight, use a little liquid soap as this will help in
assembling these parts.
Fluid Leaks
If leakage occurs at the filler plug, it is merely necessary to
replace the filler plug gasket and tighten the plug securely. If
any other serious leakage develops, the lower half of the unit
should be replaced.
Rebuilding
1. Hold the base of the unit securely in a vise.
2. Compress the top and rotate it until pin in the top fits into
hole in the piston rod bushing.
3. Tap the top lightly with a hammer so that the pin will be
properly engaged. Unscrew the piston rod bushing by turning
the head with a bar fitted into the grommet hole and the upper
and lower ends pulled apart.
4. Remove piston rod nut (10), Pressure Relief Valve (12),
Metering Washer (18), Piston (8), Intake Valve (16), Intake
Valve Star Spring, Support Washer (11), Figure 1901.
5. The piston rod bushing can then be removed.
To reassemble, follow the reverse order. All parts should
be carefully washed with gasoline and blown until dry. Make
sure that the piston rod bushing is assembled with the hole
pointing toward the top of the unit. The nut at the bottom of
the piston rod should be securely tightened and staked. The
reserve fluid chamber gasket (19) is permanently assembled.
Therefore, if excessive leakage develops at this point, the
shock absorbers should be replaced.
MECHANICAL PROCEDURE MANUAL
SECTION 19
Page 3
Printed in U. S. A. ISSUED MAY, 1937