SECTION 3 - CHASSIS & TURNTABLE
3-22
– JLG Lift –
3121827
Table 3-3. Swing Motor Troubleshooting
Trouble
Cause
Remedy
Oil Leakage
1. Hose fittings loose, worn or damaged.
2. Oil seal rings (4) deteriorated by excess heat.
3. Special bolt (1, 1 A, 1B or 1C) loose or its sealing
area deteriorated by corrosion.
4. Internal shaft seal (16) worn or damaged.
5. Worn coupling shaft (12) and internal seal (16).
Check & replace damaged fittings or "O" Rings. Torque to
manufacturers specifications.
Replace oil seal rings by disassembling unit.
(a) Loosen then tighten single bolt to torque specification.
(b) Replace bolt.
Replace seal. Disassembly of motor unit necessary.
Replace coupling shaft and seal by disassembling unit.
Significant loss of speed under load
1. Lack of sufficient oil supply
2. High internal motor leakage
3. Severely worn or damaged internal splines.
4. Excessive heat.
(a) Check for faulty relief valve and adjust or replace as
required.
(b) Check for and repair worn pump.
(c) Check for and use correct oil for temperature of opera-
tion.
Replace worn rotor set by disassembling unit.
Replace rotor set, drive link and coupling shaft by disas-
sembling unit.
Locate excessive heat source (usually a restriction) in the
system and correct the condition.
Low mechanical efficiency or undue
high pressure required to operate unit
1. Line blockage
2. Internal interference
3. Lack of pumping pressure
4. Excessive binding or loading in system external to
motor unit.
Locate blockage source and repair or replace.
Disassemble unit, identify and remedy cause and repair,
replacing parts as necessary.
Check for and repair worn pump.
Locate source and eliminate cause.
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...
Page 257: ......
