SECTION 7 - BASIC TROUBLESHOOTING, ELECTRICAL INFORMATION, & SCHEMATICS
7-16
– JLG Lift –
3121827
Function sluggish during operation. (System
pressure too low.)
Main relief valve set too low.
Reset valve as required.
Pump section not delivering sufficient oil.
Repair or replace pump section or pump.
Main relief valve stuck in open position.
Clean, repair, or replace valve. (Check system oil
for contamination.)
Oil viscosity too low.
Drain system and replace with recommended oil.
(Refer to Hydraulic Oils.)
Leak in component, line or fitting.
Repair or replace component, line or fitting.
Scored valve spool; scored cylinder.
Replace valve; replace cylinder.
Hydraulic Filter clogged.
Replace filter.
Amperage too low on controller.
Correctly adjust controller.
Low voltage in electrical system.
Correct low voltage problem.
System(s) operate erratically.
Sticking or binding valve spools, pistons.
Clean, repair, or replace components as
required.
Table 7-5. Hydraulic System - Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
Summary of Contents for JLG E400AJP
Page 2: ......
Page 32: ...SECTION 1 SPECIFICATIONS 1 18 JLG Lift 3121827 NOTES...
Page 42: ...SECTION 2 GENERAL 2 10 JLG Lift 3121827 NOTES...
Page 54: ...SECTION 3 CHASSIS TURNTABLE 3 12 JLG Lift 3121827 Figure 3 3 Speed Sensor Orientation...
Page 60: ...SECTION 3 CHASSIS TURNTABLE 3 18 JLG Lift 3121827 Figure 3 7 Steering Components and Spindles...
Page 62: ...SECTION 3 CHASSIS TURNTABLE 3 20 JLG Lift 3121827 Figure 3 9 Tilt Sensor Location...
Page 86: ...SECTION 3 CHASSIS TURNTABLE 3 44 JLG Lift 3121827 Figure 3 16 Swing Components...
Page 88: ...SECTION 3 CHASSIS TURNTABLE 3 46 JLG Lift 3121827 Figure 3 18 Battery Cable Connections...
Page 90: ...SECTION 3 CHASSIS TURNTABLE 3 48 JLG Lift 3121827 Figure 3 20 On Board Generator...
Page 97: ...SECTION 3 CHASSIS TURNTABLE 3121827 JLG Lift 3 55 Figure 3 22 Generator Components...
Page 116: ...SECTION 3 CHASSIS TURNTABLE 3 74 JLG Lift 3121827 NOTES...
Page 127: ...SECTION 4 BOOM PLATFORM 3121827 JLG Lift 4 11 Figure 4 10 Boom Limit Switches...
Page 140: ...SECTION 4 BOOM PLATFORM 4 24 JLG Lift 3121827 Figure 4 13 Rotator Counterbalance Valve...
Page 178: ...SECTION 5 HYDRAULICS 5 24 JLG Lift 3121827 Figure 5 26 HydraForce Cartridge Torque Value Chart...
Page 214: ...SECTION 6 JLG CONTROL SYSTEM 6 34 JLG Lift 3121827 NOTES...
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