"2033ES / 2633ES" Service & Parts Manual - ANSI Specifications October 2008
Page 1-9
PLATFORM LIFT CIRCUIT
Note: Refer to
Hydraulic Manifold
and
Relief Pressure Adjustment Procedure
.
Refer to
Section 3
for Remove and Replace instructions.
♦ The lift system uses the hydraulic pump to obtain proportional lifting function controlled by
the lift valve and pump speed.
♦ Lowering is single speed controlled by the holding valves on the lift cylinder(s) and regu-
lated by a fixed orifice located on the lift cylinder(s).
♦ Platform capacity is limited by a hydraulic relief valve in the lift circuit. (Refer to Machine
Specifications or the Hydraulic Schematic for proper setting).
Lift Cylinder
Note: Refer to
Cylinder Repair
.
One (1) single acting type hydraulic cylinder.
The cylinder has an integrated 2-position, 2-way solenoid operated platform lower valve for hold-
ing the platform in position.
The valve is also externally actuated for manually lowering the platform. Early models use a pull-
to-release knob at the cylinder, while current models use a cable release with a pull handle lo-
cated near the ladder (see
Emergency Systems and Procedures
).
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