Relief Valve Setting - JLG TOUCAN 1010 Service Manual

3
Relief valves used in the work platform's hydraulic
system protect the system from excessive pressure
(within the circuit in which they are used) by returning
hydraulic oil to the hydraulic reservoir when the
pressure setting is exceeded.
You can determine the point at which a relief valve
opens by placing a pressure gauge in the pressure
test port of the appropriate valve manifold. The needle
on the pressure gauge will climb until it reaches the
relief valve setting. At that point, the needle will stop
climbing and fluctuate - indicating that the relief valve
is open and returning hydraulic oil to the hydraulic
reservoir.
Correct relief valve adjustment is mandatory if any
hydraulic circuit is to function properly. Relief pressure
settings must always be within established tolerances.
NOTE
Adjustment of relief valve pressure settings
should only be performed - after the need
for adjustment has been established - by
qualified mechanics using the correct
equipment.
NOTE
Check pressure settings prior to delivery of
work platform.
The table titled Relief Valve Pressure Settings lists
main and circuit relief valve pressure settings. If the
pressure setting of any relief valve is not ± 5 bar of the
setting listed in the table, adjust valve as necessary
(unless otherwise specified).
! CAUTION
Do not overtighten the adjustment screw or
locknut.
! CAUTION
Do not hold the relief valve open for more
than one minute.
! CAUTION
For a correct relief valve pressure check, the
locknut of the relief valve adjustment screw
must be tightened.
NOTE
To adjust a relief valve turn the adjustment
screw (in to increase or out to decrease) until
the proper setting is reached.
Models
Toucan 1010
Edition 04-2006
PRESSURE SETTINGS

3.1 Relief valve setting

NOTE
Check the relief valve adjustments with a
pressure gauge connected to the pressure
test port (M) of the FUNCTION MANIFOLD
except for the brake release relief valve
[PR7]. Check brake release relief valve [PR7]
adjustment with a pressure gauge connected
to the pressure test port (M) of the BRAKE
MANIFOLD.
Preparation
NOTE
Before setting pressures, warm the hydraulic
oil to between 25°C to 50°C.
NOTE
Use a 0 to 40,0 MPa/400 bar pressure gauge
when ad justi ng the relief valves. For
pressures lower than 3 MPa/30 bar, use a 6
MPa/60 bar pressure gauge.
NOTE
When adjusting the relief valves, operate the
machine from the platform controls AT
MAXIMUM SPEED.
Brake manifold
PR7
Function manifold
PR4
PR5
PR6
PR8
Test plug
PR1
PR3
Test plug
PR2
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