JLG 601S ANSI Service Manual - Manual (Page 168)

SECTION 5 - HYDRAULICS
5-20 – JLG Lift – 3120746
9. Align the control sleeve so its slot will engage the
swash plate feedback pin (slot) positioned toward
the pump cover) and insert the sleeve into the hous-
ing. Carefully align the control spool with the sleeve
and install the control onto the pump housing. Install
the four mounting screws and torque to 10 to 11
ft.lbs. (13 to 14 Nm).
10. Install the four cover screws and torque to 18 to 24
in. lbs. (2.0 to 2.7 Nm).
11. Readjust the neutral position of the control. Refer to
the instructions in the Inspections and Adjustment.
5.7 PRESSURE SETTING PROCEDURES
COLD TEMPERATURES HAVE A SIGNIFICANT IMPACT ON PRES-
SURE READINGS. JLG INDUSTRIES, INC. RECOMMENDS OPER-
ATING THE MACHINE UNTIL THE HYDRAULIC SYSTEM HAS
WARMED TO NORMAL OPERATING TEMPERATURES PRIOR TO
CHECKING PRESSURES. JLG ALSO RECOMMENDS USING A
CALIBRATED GAUGE. PRESSURE READINGS ARE ACCEPTABLE
IF WITHIN +/- 5% OF SPECIFIED PRESSURES.
Main Relief, Steer, Swing and Lift Down
a. Install pressure gauge at quick disconnect on
port MP on main valve.
b. With the aid of an assistant, activate telescope
in.
c. While monitoring pressure gauge, adjust main
relief to 3000 PSI (206.85 Bar).
d. With the aid of an assistant, activate steer left.
e. While monitoring pressure gauge, adjust steer
left relief to 1800 PSI (124.1 Bar).
f. With the aid of an assistant, activate steer right.
g. While monitoring pressure gauge, adjust steer
right relief to 1800 PSI (124.1 Bar).
h. With the aid of an assistant, activate swing left or
right.
i. While monitoring pressure gauge, adjust swing
relief to 1700 PSI (117.2 Bar).
j. With the aid of an assistant, activate lift down.
k. While monitoring pressure gauge, adjust lift
down relief to 1500 PSI (103.4 Bar).
Platform Level
a. Install pressure gauge at quick disconnect on
port M3 on main valve.
b. With the aid of an assistant, activate platform
level forward.
c. While monitoring pressure gauge, adjust plat-
form level relief to 2800 PSI (193.06 Bar).
d. Install pressure gauge at quick disconnect on
port M4 on main valve.
e. With the aid of an assistant, activate platform
level backward.
f. While monitoring pressure gauge, adjust plat-
form level relief to 1800 PSI (124.11 Bar).
4 Wheel Steer (If Equipped)
a. At the platform console using the steer select
switch activate “2 wheel steer”.
b. Install a pressure gauge in port G on main con-
trol valve.
c. With the aid of an assistant, activate steer left
and right, adjust front steer relief valve to 2500
PSI (172.4 Bar). This pressure only affects the
front axle.
d. At the platform console using the steer select
switch activate “crab” or “coordinated” steer.
e. At the main control valve block disconnect the
wire din connectors on the front steer valve.
When steer is activated only the rear steer will
work.
f. Install a pressure gauge in port G on main con-
trol valve.
g. With the aid of an assistant, activate steer left
and right, adjust rear steer relief valve to 2500
PSI (172.4 Bar). Reading at the valve bank 2500
PSI (172.4 Bar) will give you 2000PSI (137.9 Bar)
at the cylinders.
h. Re-connect the front steer din connectors at the
valve bank.