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FOLDING TOP 13-29
FROM BOTTOM
OF CYLINDER
Fig. 13-64— Operation Of Pump To Lower Top
rotors counterclockwise as indicated by the
large arrow in Figure 13-64. The action of the
pump rotors forces the fluid under pressure
to the top of each cylinder. This action causes
the fluid below the piston in each cylinder to
be forced into the pump which recirculates the
fluid to the top of each cylinder. The surplus
hydraulic fluid due to piston rod displacement
flows into the reservoir.
FLUID CONTROL VALVE
The fluid control valve consists of a rocker arm
installed in the pump cover plate, and two steel
balls. Figure 13-65 shows the top surface of the
pump cover plate. The dotted lines indicate the
cavities on the bottom side of the cover plate. The
cavities are designed to permit fluid flow between
pump rotors and the reservoir. Figure 13-66 and
Figure 13-67 illustrates the operation of the fluid
control valve.
1
Jl
HE
inpr « * : : :*
:
* • u p ,
1
O K*-" FLUID CONTROL
f
VALVE ROCKER
ARM
1732
EXCESS
DRAWN
FLUID REQUIREMENTS
IN FROM RESERVOJR,
^
^
^
RESERVOIR SIDE
iSlSl
I x ^ , /
1
1
1 PUMP ClftF
£
PRESSURIZED FLUID
SEATS BALL
PREVENTING FLUID FROM
ENTERING RESERVOIR
1730
Fig. 13-66-Fluid Control Valve
MECHANICAL CHECKING PROCEDURE
If there is a failure in the hydro-lectric system
and the cause is not evident the mechanical opera-
tion of the top should first be checked. If the folding
top assembly appears to have a binding action, dis-
connect the top lift cylinder piston rods from the
top linkage and then manually raise and lower the
top.
The top should travel through its up and down
cycle without any evidence of binding action. If a
binding action is noted when the top is being locked
at the header, check the alignment of the door
SURPLUS FLUID
(DUE TO PISTON ROD DISPLACEMENT)
ENTERS RESERVOIR
THROUGH VALVE
RESERVOIR SIDE
PUMP SIDE
PRESSURIZED FLUID SEATS BALL
PREVENTING FLUID FROM
ENTERING RESERVOIR
1731
Fig. 13-65—Pump Cover Plate
Fig. 13-67 —Fluid Control Valve
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