JLG ERT2669, Service And Maintenance Manual

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SECTION 4 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
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Pressure Relief Valve - Setting Procedures (For RT)
1. Main Relief Valve
a. Instrumentation / Setup:
1. Install a pressure gauge, 5000 PSI or higher, at the
port M on the main control valve located in the
hydraulic compartment on the right-hand side of
the machine (see Figure 4-19.).
b. Pressure Setting Check:
1. Turn machine on and start the engine.
2. Enter "Level 1 Access" mode on JLG analyzer.
3. Navigate to the “SERVICE” menu and then
"SER VICE: SET MAIN RELIEF?"
4. Enter the access code 51788 and press enter to
activate main relief pressure setting mode.
NOTE: This will cause the engine speed to increase to allow
for proper measurement.
5. If the pressure gauge reads more than 50 PSI
above or below 3800 PSI (262 bar), adjustment is
required (follow steps in the “Pressure Setting
Adjustment” portion. If no adjustment is required
press the escape button on the analyzer to exit
main relief pressure setting mode.
Figure 4-19. Pressure Gauge Installation