Hydraulic Schematic, Sl26/30Sl; Table 5-2: Hydraulic Schematic Legend (064148-022) - Upright SL30SL Service & Parts Manual

Section
5.2
5.2 H S , SL26/30SL
YDRAULIC CHEMATIC

Table 5-2: Hydraulic Schematic Legend (064148-022)

DESIGNA
NAME FUNCTION LOCATION
TION
BR1 Brake, Multi-disc Parking brake Right rear wheel
BR2 Brake, Multi-disc Parking brake Left rear wheel
CV1 Check Valve, Brake Allows free flow of oil from brakes Valve Block
around pressure reducing valve
CV2 Check Valve, Lift Prevents oil from leaking through Valve Manifold
Lift Valve
CV3,4 Check Valves, Axle Locks Axle Float Cylinder when On Axle Float
Float Cylinder platform is elevated Cylinder
CV5-8 Check Valves, Tilt Locks Tilt Cylinder to prevent On Tilt Cylinder
Cylinder motion when platform is elevated
CYL1 Cylinder, Steering Provides force to steer front wheels Front of chassis
CYL2 Cylinder, Lift Provides force to Lift Platform Between chassis
pedestal weldment
and lower arm weld't
CYL3 Cylinder, Axle Float Locks front axle when platform is Front axle
elevated
CYL4 Cylinder, Fore/Aft Provides front and rear leveling of Rear of elevating
Tilt platform assembly
CYL5 Cylinder, Side/Side Provides right and left leveling of Right rear of elevating
Tilt platform assembly
FD1 Flow Divider, Diverts oil to Steering Valve Valve Manifold
Steering
FD2 Flow Divider, Allows positive traction in parallel Valve Manifold
Combiner drive
FD3 Flow Divider, Tilt Diverts oil for platform leveling Auxiliary Valve
Manifold
FL1 Filter Filters oil returning to tank. Top of hydraulic tank
FL2 Filter, Suction Traps particles in hydraulic tank Inside hydraulic tank,
Screen at outlet.
MOT1 Motor, Drive Drives left rear wheel Left rear axle
MOT2 Motor, Drive Drives right front wheel Left front axle
MOT3 Motor, Drive Drives right rear wheel Right rear axle
MOT4 Motor, Drive Drives right front wheel Right front axle
ORF1 Orifice, Down Controls the platform rate of Valve Manifold
descent
ORF2 Orifice, Cushion Slows the platform rate of descent Cushion Valve Block
Down during the last 12 in. (300mm) of
platform lowering
P1 Pump, Hydraulic Provides fluid power for hydraulic Rear of engine
system
P1 Pump, Brake Release Brakes Manually Rear of Chassis
Release
RV1 Relief Valve, Main Provides overpressure protection to Valve Manifold
Pump
RV2 Relief Valve, Provides overpressure protection to Valve Manifold
Steering steering components
RV3 Relief Valve, Rear Provides overpressure protection to Mounted behind
Drive Cross drive motors during turning hydraulic tank
RV4 Relief Valve, Front Provides overpressure protection to Mounted behind
Drive Cross drive motors during turning hydraulic tank
5-4
S
CHEMATICS
DESIGNA
NAME FUNCTION
TION
RV5 Relief Valve, Fore/ Provides overpressure protection
Aft Tilt for forward leveling
SV1 Shuttle Valve Provides oil to brakes when either
drive FORWARD or REVERSE are
actuated.
V1 Valve, Steering Provides directional control for
Steering Cylinder
V2 Valve, Forward Prevents machine from running
Counterbalance away on slopes and also cushions
stops
V3 Valve, Reverse Prevents machine from running
Counterbalance away on slopes and also cushions
stops
V4 Valve, Forward Provides directional control of oil for
forward drive
V5 Valve, Reverse Provides directional control of oil for
reverse drive
V6 Valve, Velocity Fuse Locks Lift Cylinder if line breaks
V7 Valve, Lift Provides oil flow to Lift Cylinder
V8 Valve, Down Allows oil to flow out of Lift Cylinder
to tank
V9 Valve, Proportional Prevents oil from bypassing while
driving or lifting
V10 Valve, Brake Allows use of brake release pump
Release by closing return circuit
V11 Valve, Axle Float Allows Axle Cylinder to float when
energized, locks Axle Cylinder
when not energized
V12,13 Valves, Series/ Shifting both valves changes the oil
Parallel flow from hight torque (parallel) to
high speed (series).
V14 Valve, Brake Drops system pressure to 390 psi
Pressure Reducing (27 bar) for proper Brake operation
V15 Valve, Cushion Closes to send oil thru Cushion
Down Down Orifice, slowing platform rate
of descent for the last 12 in.
(305mm)
V16 Valve, Steering Directs oil to platform leveling or
Dump steering valves
V17 Valve, Fore/Aft Tilt Provides direction control of oil for
fore/aft platform leveling
V18 Valve, Side/Side Tilt Provides direction control of oil for
side/side platform leveling
SL26/30SL Work Platform
LOCATION
Auxiliary Valve
Manifold
Valve Manifold
Valve Manifold
Valve Manifold
Valve Manifold
Valve Manifold
Valve Manifold
Lift Cylinder
Valve Manifold
Valve Manifold
Valve Manifold
On front of brake
release pump assy.
Mounted on side of
hydraulic tank
Valve Manifold
Valve Manifold
Valve Manifold
Auxiliary Valve
Maniold
Auxiliary Valve
Manifod
Auxiliary Valve
Manifod