JLG G5-18A Service Manual - Manual (Page 81)

8.7 G5-18A/2505
Hydraulic System
8.5.5 Steering Pressure Checking
Attach a pressure gauge to the test fitting (1) at the rear
of the implement pump. The pressure reading should be
2700 ±50 psi (186 ±4 bar) with the steering wheel fully
turned to one direction.
Note: The 2700 ± 50 psi (186 bar) steering pressure
reading at the main control valve is 100 psi (7 bar)
HIGHER than the 2600 ± 50 psi (179 bar) steering
pressure at the individual valve section. DO NOT adjust
the main control valve relief pressure below 3800 ± 50
psi (262 bar).
To check individual valve section pressures, install a tee
and test port between the cylinder being checked and
the corresponding valve section on the main control
valve.
Do NOT adjust any relief settings. The unit is preset at the
factory and should not be tampered with. If the proper
pressure is not read, the unit may be defective.