Cadillac 60 Series 1963 Shop Manual page 568

BODY
16-99
5. Disconnect
motor lead.
red switch-to-motor wire from
6. Connect light tester to red switch-to-motor
wire terminal.
7. Actuate switch control knob to "up" position.
If tester does not light, there is an open or short
circuit in wire.
d. Checking Motor Unit
If a light tester indicates current at the motor
lead terminals of the switch-to-motor wires, but
motor unit does not operate from switch, a final
check of the motor unit can be made as follows:
1. Check connection of motor ground wire to
body metal, C in Fig. 16-121.
2. Connect a #12 jumper wire from battery po-
sitive pole to motor lead terminal that connects
to green switch-to-motor wire. The motor should
operate to lower top.
3. Connect jumper wire to motor lead terminal
that connects to red switch-to-motor wire. The
motor should operate to raise top.
4. If motor fails to operate on either or both
of these checks, it should be repaired or replaced.
5. If motor operates with jumper wire but will
not operate from switch-to-motor wires, the trou-
ble may be caused by reduced currect, resulting
from damaged wiring or poor connections.
b. Checking Operation of Lift
Cylinders
1. Remove rear seat cushion and folding top
compartment side panel assemblies.
2. Operate folding top control switch and ob-
serve lift cylinders during "up" and "down"
cycles for these conditions.
a. If movement of cylinder is not coordinated
or sluggish when the motor is actuated, check
hydraulic hoses from motor and pump to cylinder
for kinks.
b. If one cylinder rod moves slower than the
other, cylinder having slower moving rod is de-
fective and should be replaced.
c. If both cylinder rods move slowly or do not
move at all, check pressure of the pump.
c. Checking Pressure at the Pump
1. Remove motor and pump assembly from rear
compartment.
2. Install plug in one port, and pressure gage
in port to be checked Fig. 16-126.
3. Actuate motor with applied terminal voltage
within range of 9.5 volts to 11.0 volts. Pressure
gage should show a pressure between 340 psi and
380 psi.
4. Check pressure in other port.
94. Hydraulic Checking Procedure
Failures in the hydraulic system can be caused
by lack of hydraulic fluid, leaks in hydraulic sys-
tem, obstructions or kinks in hydraulic hoses or
faulty operation of a cylinder or pump.
a. Checking Hydraulic Fluid Level
in Reservoir
1. Operate top to raised position.
2. At rear compartment, remove pump and
motor shield.
3. Place absorbent rags below reservoir at
filler plug.
4. With a straight-bladed screwdriver, remove
filler plug. Fluid level should be within 1/4 inch
of lower edge of filler plug hole.
5. If fluid is low, add hydraulic brake fluid to
bring to specified level.
6. Reinstall filler plug and pump and motor
shield.
NOTE: A difference in pressure readings
may exist between the pressure port for top of
cylinders and pressure port for bottom of cyl-
inders. This condition is acceptable if both
readings are within the limit of 340 psi and
380 psi.
5. If the pressure is not within specified limits,
unit is defective and should be repaired or re-
placed, as required.
Pressure Gage Tool-
No. KMO-687
Fig. 16-126 Checking Pump Pressure