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3-13. Kidney Lift System
The Kidney Lift cylinders are connected in series
so that both cylinders operate simultaneously.
Hydraulic pressure on one side of the lead piston
causes the piston to move. The piston movement
forces the hydraulic fluid on the other side of the
piston through the system to the other cylinder.
This simultaneously activates the other piston. A
bypass system is connected to the right cylinder
assembly for initial set-up and adjustment of the
kidney lift system. Use the following procedures to
bleed or adjust the system if needed.
a. Bleeding the System - If the hydraulic lines or
cylinders have been disconnected from the kidney
lift system for any reason, use the following proce-
dure to bleed the air from the system. Refer to figure
3-14 for bypass valve location.
1. Remove the kidney lift top section and begin
the procedure with both pistons in the down posi-
tion (chambers A & C) as shown in figure 3-11.
2. Make sure the bypass valve is closed (valve
screw tight) and activate "KIDNEY DOWN". The
hydraulic fluid will fill cavity "D" as shown in figure
3-11.
Figure 3-11.
3. Open the bypass valve by loosening the
screw in the bottom of the valve and activate
"KIDNEY UP". Hydraulic fluid fills cavity "A" and
pushes the piston into cavity "B". The open valve
allows a path for air to escape from cavity "B"
without affecting the piston in "C". See figure 3-12.
LEFT
CYLINDER
BA
DC
BYPASS VALVE
CLOSED
RIGHT
CYLINDER
DOWN
LEFT
CYLINDER
BA
DC
BYPASS VALVE
OPEN
RIGHT
CYLINDER
UP
LEFT
CYLINDER
BA
DC
BYPASS VALVE
OPEN
RIGHT
CYLINDER
UP
4. Leave the bypass valve open and activate
"KIDNEY DOWN". Hydraulic pressure keeps the
piston in chamber "C", the hydraulic fluid passes
through the bypass valve and fills cavity "B" push-
ing the piston into cavity "A". See figure 3-13.
Figure 3-12.
Figure 3-13.
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