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October 2008
"3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page 1-14
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 proportional valve.
•
Lowering is single speed controlled by the holding valves on the lift cylinder(s) and regulated
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 Speci-
fications or the Hydraulic Schematic for proper setting).
Lift Cylinder
Note: Refer to Emergency Lowering.
Refer to
Cylinder Repair.
Lift cylinders have an integrated down (holding) valve. The normally closed valve is 2-position, 2-way
solenoid operated and holds the platform in position by preventing hydraulic fluid from returning to the
reservoir while the valve is closed. The normally closed holding valve prevents retraction of the cylin-
der rod (and platform descent) should a hydraulic line rupture or a leak develop between the cylinder
and its related control valve. The valve is also externally actuated for lowering the platform in emer-
gency situations.
3072ES
The 3072ES is equipped with one (1) single acting type hydraulic cylinder.
The down valve is also externally actuated via a cable for manually lowering the platform.
3772ES
Two (2) single acting type hydraulic cylinders.
The down valves are also externally actuated via a toggle switch for manually lowering the platform.
ART_2552
LEFT SIDE VIEW
FRONT VIEW
Lift
RED/BLU
Lift Relief Valve
Lift Port
Orifice Under Fitting
3 Way Solenoid
Operated Hydraulic
Spool Valve
Содержание 3072ES
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Страница 144: ...October 2008 Page B 8 3072ES 3772ES 3772ES HD Service and Parts Manual ART_2096 Entry Chain Reference ART_13850 1 2 3...
Страница 152: ...October 2008 Page B 16 3072ES 3772ES 3772ES HD Service and Parts Manual ART_2100 Lanyard Anchorage Points 1 4 3 5 2...
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Страница 250: ...3072ES 3772ES 3772ES HD Service and Parts Manual October 2008 Part Number Index Part Number Page Part Number Page...
Страница 252: ...NOTES...