Jlg 40H Service Manual User Manual Page 114
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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SECTION 3 - TROUBLESHOOTING
3-2 – JLG Lift – 3120240
Table 3-1. Platform Assembly Troubleshooting.
TROUBLE PROBABLE CAUSE REMEDY
PLATFORM LEVELING SYSTEM
Automatic Leveling Inoperative Hydraulic system oil low.
Dual check valves dirty/inoperative.
Restricted or broken hydraulic line or fitting on slave
cylinder or lift cylinder.
Spit valve(s) leaking.
Worn seal(s) in slave level or lift cylinder.
Counterbalance valves in slave cylinder defective.
Slave level or lift cylinder not functioning properly.
Replenish oil as necessary.
Clean or replace as necessary.
Clean, repair, or replace line or fitting.
Clean, repair, or replace spit valve(s).
Replace seal(s).
Replace counterbalance valve.
Repair or replace cylinder.
Platform Will Not Maintain Level Attitude. Counterbalance valve on slave leveling cylinder
improperly adjusted or not functioning properly.
Worn seal(s) in slave level or lift cylinder.
Damaged slave level or lift cylinder.
Replace valve.
Replace seal(s).
Repair or replace cylinder.
No Response To Platform Leveling Controls. Level control inoperative.
Hydraulic system oil low.
System orifice plugged/dirty.
Restricted or broken hydraulic line or fitting.
Control valve not functioning properly.
No electric to dump or control valve.
Slave cylinder not functioning properly.
Repair or replace control valve.
Replenish oil as necessary.
Clean orifice.
Clean, repair, or replace line or fitting.
Repair or replace valve.
See proper wiring diagram.
Repair or replace pump.
Platform Will Not Adjust “Up” To Level. Hydraulic pump not functioning properly.
Restricted or broken hydraulic line or fitting.
Slave cylinder not functioning properly.
Electrical failure.
Orifice plugged.
Repair or replace pump.
Clean, repair, or replace line or fitting.
Repair or replace cylinder.
See proper wiring diagram.
Clean orifice.
Platform Will Not Adjust “Down” To Level. See: Platform will not adjust “up” to level.
- October 11, 2001 1
- PRECAUTIONS 3
- REVISON LOG 4
- TABLE OF CONTENTS 5
- (Continued) 6
- SECTION 3 - TROUBLESHOOTING 6
- LIST OF FIGURES 6
- FIGURE NO. TITLE PAGE NO 6
- (INTENTIONAL BLANK PAGE) 8
- SECTION 1. SPECIFICATIONS 9
- 1-2 – JLG Lift – 3120240 10
- 3120240 – JLG Lift – 1-3 11
- SECTION 1 - SPECIFICATIONS 12
- Deutz F3L912/F3L1011 Engine 12
- Wisconsin VG4D Engine 12
- 1-8 – JLG Lift – 3120240 16
- 3120240 – JLG Lift – 1-9 17
- SECTION 2. PROCEDURES 21
- 2-2 – JLG Lift – 3120240 22
- 3120240 – JLG Lift – 2-3 23
- 2-4 – JLG Lift – 3120240 24
- 3120240 – JLG Lift – 2-5 25
- 2-6 – JLG Lift – 3120240 26
- 3120240 – JLG Lift – 2-7 27
- 2.9 CYLINDER REPAIR 29
- Disassembly 29
- Cleaning and Inspection 30
- Assembly 30
- 2.10 CYLINDER REMOVAL AND 32
- INSTALLATION 32
- Telescope Cylinder Removal 32
- 2-14 – JLG Lift – 3120240 34
- Inspection 36
- 3120240 – JLG Lift – 2-19 39
- 2-20 – JLG Lift – 3120240 40
- 3120240 – JLG Lift – 2-21 41
- 2-22 – JLG Lift – 3120240 42
- Linkage 43
- Mounting-Controller 44
- Power Distribution 44
- Troubleshooting 48
- 2.17 THROTTLE CHECKS AND 49
- ADJUSTMENTS - DEUTZ F2L511 49
- ENGINE. (SEE FIGURE 2-8.) 49
- 3120240 – JLG Lift – 2-33 53
- 3120240 – JLG Lift – 2-35 55
- ADJUSTMENT 78
- 2.23 SWING BEARING 79
- Wear Tolerance 80
- Installation 81
- Swing Bearing Torque Values 82
- Repair 85
- 2.26 SWING DRIVE BRAKE, MICO 91
- (MACHINES BUILT PRIOR TO MAY 91
- 1992). (SEE FIGURE 2-39.) 91
- 2-72 – JLG Lift – 3120240 92
- Bleeding 94
- 3120240 – JLG Lift – 2-75 95
- 3120240 – JLG Lift – 2-77 97
- 3120240 – JLG Lift – 2-79 99
- SECTION 2 - PROCEDURES 100
- 3120240 – JLG Lift – 2-81 101
- 3120240 – JLG Lift – 2-83 103
- 3120240 – JLG Lift – 2-85 105
- 3120240 – JLG Lift – 2-87 107
- 3120240 – JLG Lift – 2-89 109
- INSPECTION SCHEDULE 110
- 2-92 – JLG Lift – 3120240 112
- SECTION 3. TROUBLESHOOTING 113
- SECTION 3 - TROUBLESHOOTING 114
- JLG Worldwide Locations 152
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