JLG 510AJ Service Manual - Manual (Page 273)

SECTION 5 - HYDRAULICS AND HYDRAULIC SCHEMATICS
3121181 – JLG Lift – 5-53
5.6 PRESSURE SETTING PROCEDURE
Cold temperatures have a significant impact on pressure read-
ings. JLG Industries Inc. recommends operating the machine
until the hydraulic system has warmed to normal operating
temperatures prior to checking pressures. JLG Industries Inc.
also recommends the use of a calibrated gauge. Pressure read-
ings are acceptable if they are within ± 5% of specified pres-
sures.
Telescope Main Relief
1. Install a high pressure gauge at port “M1” located on
front face of valve block.
2. Activate telescope in.
3. Adjust relief valve to 3300 psi (227.5 Bar), located on
front face of block, 5th relief valve counting left to right.
Turn clockwise to increase and counterclockwise to
decrease.
Steer
1. Install a high pressure gauge at port “M3”.
2. Activate steer and adjust relief valve to 2500 psi (172
Bar). Relief valve is located on front face of block, 3rd
relief valve counting left to right. Turn clockwise to
increase and counterclockwise to decrease.
Platform Level Up
1. Install a high pressure gauge at port “M2”, located on
platform valve block.
2. Activate level up to the end of stroke, you should read
2800 psi (193 Bar).
3. Level up relief valve is located right next to the check
port. Turn clockwise to increase and counterclockwise to
decrease.
Platform Level Down
1. Install a high pressure gauge at the port marked “M1”,
located on the platform valve block.
2. Activate level down to the end of stroke, reading 1800
psi (124 Bar).
3. The level down relief valve is located right next to the
check port. Turn clockwise to increase and counterclock-
wise to decrease.
Articulating Jib
1. Install a high pressure gauge on the port “M3” on Jib
block, located on platform valve block.
2. Activate Jib up or down. Pressure should read 1500 psi
(103 Bar).
3. The relief valve is located on the Jib block. Turn clock-
wise to increase, counterclockwise to decrease.
Proportional Main Relief
1. Install a high pressure gauge at port “M2”, located on
front face of the block.
2. Raise the boom up to the end of stroke, or remove the
hose from port #10 and plug and cap, then activate lift
up.
3. Adjust valve to 3200 psi (220 Bar). This relief valve is
located on front face of block and is 4th relief valve
counting left to right. Turn clockwise to increase, coun-
terclockwise to decrease.
Lift Down
1. Install a high pressure gauge at port “M2”.
2. Activate lift down.
3. Adjust relief valve to 1200 psi. Relief valve is located on
the front face of the block, and is 2nd relief valve count-
ing left to right. Turn clockwise to increase, counter-
clockwise to decrease.
Swing
1. Left and right are done with one adjustment.
2. Install a high pressure gauge at port “M4”, located on
front face of main valve.
3. Either remove one of the swing hoses, plug and cap or
swing turntable around until it hits the stop.
4. Activate swing. Pressure should read 1700 psi. The relief
valve is located on front face of the block, first relief
valve counting left to right. Turn clockwise to increase,
counterclockwise to decrease.