JLG 740AJ, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFOR M ATION AND SCHE M ATICS
5-98 3121160
Fault- logic Trouble Shooting
Match the transmission symptoms with the problem state-
ments and follow the action steps shown in the box diagrams.
This will give expedient aid in correcting minor problems elim-
inating unnecessary machine down time.
Following the fault - logic diagrams are diagram action com-
ments of the action steps shown in the diagrams. Where appli-
cable, the comment number of the statement appears in the
action block of the diagrams.
RECOMMENDED GAUGE LOCATIONS
Gauges Recommended
Inlet vacuum gauge: 30 psi to 14.8 psi (2 bar to 1 bar)
System pressure gauge: 10,000 psi (700 bar)
Charge pressure gauge: 0 to 600 psi (0 to 50 bar)
Case pressure gauge: 0 to 300 psi (0 to 25 bar)
Charge Pump Suction Port
Tee in line to check Inlet Vaccum
Pressure Ports
Tee in line to check System
Pressure
Auxilliary Port
Check Charge Pressure
Drain Port
Tee in line to check Case
Pressure
Figure 5-145. Gauge Locations