JLG 40RTS Service Manual - Manual (Page 35)

SECTION 2 - PROCEDURES
3120826 – JLG Sizzor – 2-19
NOTE: With the engine on low idle, "crack", (loosen-don’t
remove), the system lines at the motor(s). Continue
to run the engine at low idle and tighten the system
lines as soon as oil is observed to leak from them.
When oil is observed to "leak" at the motor the line is
full, the air has been purged, and the system hoses
should be retightened to their specified torque.
Once charge pressure has been established, increase
speed to normal operating RPM. Charge pressure should
be as indicated in the pump model code. If charge pres-
sure is inadequate, shut down and determine the cause
for improper pressure.
INADEQUATE CHARGE PRESSURE WILL AFFECT THE OPERA-
TOR’ S ABILITY TO CONTROL THE MACHINE.
Shut down the engine and connect the external control
input signal. Also reconnect the machine function(s), if
disconnected earlier. Start the engine, checking to be cer-
tain the pump remains in neutral. With the engine at nor-
mal operating RPM, slowly check for forward and reverse
machine operation.
Charge pressure may slightly decrease during forward or
reverse operation. Continue to cycle slowly between for-
ward and reverse for at least five minutes.
Shut down engine, remove gauges, and plug ports.
Check reservoir level and add filtered fluid if needed.
The machine is now ready for operation.
2.19 PRESSURE SETTING PROCEDURES -
(2 W/S)
Racine Two Stack Valve
1. Install pressure gauge at quick connect on Racine
Two Stack Valve.
2. Adjust both Steer Section Crossover Relief’s all the
way in.
3. Adjust Main Relief Cartridge out several turns.
4. Activate engine and allow hydraulic system to come
up to operating temperature.
5. Bottom out Steer function. Adjust Main Relief to 172
bar (2500 psi).
6. Bottom out Steer Right and Steer Left functions and
adjust each Steer Crossover Relief to 103 bar (1500
psi).
7. Bottom out Lift Up functions and adjust Lift Up Relief
Pressure to:
25RTS - 90 bar (1300 psi)
33RTS - 106 bar (1550 psi)
40RTS - 138 bar (2000 psi)
8. De-energize Lift function, shut down motor, and dis-
connect pressure gauge.
Lift Down Speed Adjustment
1. Activate engine and allow hydraulic system to come
up to operating temperature.
2. Adjust color flow valve lift down speed at 30-40 sec-
onds.
Leveling Jacks Valve (If Equipped)
1. Activate engine and allow hydraulic system to come
up to operating temperature.
2. Install pressure gauge at quick connect on Racine
Two Stack Valve.
3. Energize and bottom out any jack function. Adjust
relief cartridge as follows:
25RTS - 90 bar (1300 psi)
33RTS - 106 bar (1550 psi)
40RTS - 138 bar (2000 psi)
4. De-energize jack function and shut down engine.
Remove pressure gauge.