Page 11
Figure 1-12. Kidney Lift Cylinder Assembly
6. Brake Cylinders - The brake cylinders are
single action type similar to the elevation cylinder.
The movable piston's ram is connected to a brake
pad. See figure 1-13. Oil pumped into the top of the
cylinder pushes the piston down raising the table
base off its casters. An internal return spring
pushes the piston up to return the oil through the
mini-valve to the reservoir.
4. Elevation Cylinder - This single action cylin-
der does not have hydraulic fluid on both sides of
the piston. It depends on the weight of the table top
assembly to lower it.
The cylinder is set in the center of the elevation
main column. The two stage cylinder is elevated by
the driven force of the oil pressure. When lowering,
the oil that is accumulated in the cylinder is returned
to the oil reservoir through the mini-valve due to the
table top weight.
A slider support assembly is used to support the
weight of the upper table section. A stainless steel
shroud covers the flexible hydraulic hoses and
slider. See figure 1-11.
Figure 1-11. Elevation Cylinder Assembly
5. Kidney Lift Cylinders - The two kidney lift
cylinders have a ram that has rack gear teeth cut
into the top surface. O-Rings on each end of the
ram allow the ram to also serve as the pistons.
The rack teeth cut into the top of the ram meshes
with a pinion gear. This gear meshes with other
gears to supply the up or down drive for the kidney
lift bars, depending on which direction the oil is
pumped into the cylinder. See figure 1-12.
Figure 1-13. Single Action Brake Cylinder
O-RINGS
RAM
PINION
GEAR
O-RINGS
82206-112
82206-113
OIL LINE
RETURN SPRING
BRAKE PAD
PISTON
ELEVATION
CYLINDER
SHROUD
ELEVATION
COLUMN
SECONDARY
PISTON
PRIMARY
PISTON
90606-113
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