D9S001ES1-01016
3 Theory of Operations
3.1 Undercarriage
3.1.1 Bed lifting control (S6015663)
Bed lifting depends on 2 Power Packer DSC3 PS-157 hydraulic units. The hydraulic unit is a compact element consisting of basin,
pump, piston rod and valves. Lifting is reached by repeated pressing of the piston which is repeatedly returned by a spring. By
stepping on the lifting pedal both piston rods are moving up simultaneously. Their synchronization is secured by an adjustment of
screws on operating rod at foot column. Lifting mechanism consists of some levers.
Fig.3 Bed lifting control (S6015663)
3.1.2 Bed lowering control (S6015713)
Bed lowering depends on separate pushing of lowering valves of the hydraulic unit. It results in Trendelenburg tilt or Anti-Trendelen-
burg tilt, but from the upper position only.
Two separate double-sided pedals and operating rods cause bed lowering. To lower the bed in a horizontal position, it is necessary
to depress both pedals at the same time. The setting of the pedals is independent of each other, it is done by adjusting the nut on the
control rod at the valve of the hydraulic unit.
Adjustment screw
for lifting mechanism
Fig.4 Bed lowering control (S6015713)
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