JLG 340AJ Service Manual - Manual (Page 223)

SECTION 5 - HYDRAULICS
3121259 – JLG Lift – 5-65
PRESSURE LIMITER ADJUSTMENT
Lock motor output shaft to adjust the pressure limiter setting.
Lock the vehicle's brakes or rigidly fix the work function so it
cannot rotate.
NOTE: Ensure charge pressure is properly set before checking
pressure limiter.
NOTE: If you change pressure limiter settings, you must also
change the HPRV valve to maintain proper PL function.
Refer to the table for corresponding settings.
1. Install 600 bar [10,000 psi] pressure gauges in the high
pressure gauge ports (MA and MB). Install a 50 bar [1000
psi] pressure gauge in the charge pressure gauge port
(M3).
NOTE: The model code on the serial plate gives the factory setting
of the PL (Pressure Limiter).The PL setting is referenced to
charge pressure. Subtract charge pressure from system
pressure gauge readings to compute the effective PL set-
ting.
2. Start the prime mover and operate at normal speed.
3. Use a 17mm wrench to loosen the locking nut (L024).
4. Activate the control input until pressure in the high side
of the system loop stops rising. This pressure is the PL
setting.
5. Return the pump to neutral and adjust the PL setting
using an internal hex wrench. Wrench size is in the dia-
gram on the previous page. Turn the adjusting screw
clockwise to increase the PL setting, counter clockwise
to decrease it.The adjustment is very sensitive. Change
per turn is approximately 150 bar [2176 psi].
NOTE: Change per turn is 150 bar/rev [2176 psi/rev].
Figure 5-34. Charge Pressure Adjustment