Service Manual Owner's manual
Table Of Contents
- Section 1. Specifications
- Section 2. General
- Section 3. Chassis & Turntable
- 3.1 Tires & Wheels
- 3.2 Wheel Drive Assembly, 2WD
- 3.3 Drive Motor - 2WD (Prior to S/N 83331)
- 3.4 Drive Motor (S/N 83331 to Present)
- 3.5 Torque Hub
- 3.6 Wheel Drive Assembly, 4WD
- 3.7 Torque Hub (4WD Machines W/ Integral Brake)
- Roll, Leak and Brake Testing
- Tightening and Torquing Bolts
- Main Disassembly
- Input Carrier Disassembly
- Output Carrier Disassembly
- Housing-Spindle Disassembly
- Spindle-Brake Disassembly
- Input Carrier Sub-Assembly
- Output Carrier Sub-Assembly
- Spindle-Brake Sub-Assembly
- Housing-Spindle Sub-Assembly
- DW2B Integral Brake Check
- Main Assembly
- 3.8 Drive Brake, 2WD - Mico (Prior to S/N 83331)
- 3.9 Re-Aligning torque hub input coupling
- 3.10 Oscillating Axle Bleeding Procedure and Lockout Test
- 3.11 Swing Drive Hub
- 3.12 Swing Brake - Mico (Prior to S/N 66417)
- 3.13 Swing Motor (Prior to S/N 66417)
- 3.14 Swing Motor (S/N 66417 to Present)
- 3.15 Procedure For Setting Gear Backlash
- 3.16 Swing Bearing
- 3.17 Rotary Coupling
- 3.18 Generator
- 3.19 Ford EFI Engine
- 3.20 Deutz EMR 2 (S/N 85332 to Present)
- 3.21 GM Engine General Maintenance
- 3.22 GM Engine Dual Fuel System
- Fuel Filter
- Electric Lock Off
- EPR Assembly
- Low Pressure Regulator (LPR)
- Air Fuel Mixer
- Electronic Throttle Control (ETC)
- Engine Control Module
- Heated Exhaust Gas Oxygen Sensor
- Gasoline Multi Point Fuel Injection System (MPFI)
- Gasoline Fuel Pump
- Gasoline Pressure And Temperature Sensor Manifold
- Fuel Filter
- Fuel Injector Rail
- Fuel Injector
- 3.23 GM Engine Fuel System Repair
- Propane Fuel System Pressure Relief
- Propane Fuel System Leak Test
- Propane Fuel Filter Replacement
- Electronic Pressure Regulator (EPR) Assembly Replacement
- Temperature Manifold Absolute Pressure (TMAP) Sensor
- Electronic Throttle Control Replacement
- Mixer Replacement
- Coolant Hose Replacement
- Vapor Hose Replacement
- Engine Control Module Replacement
- Heated Exhaust Gas Oxygen Sensor Replacement
- 3.24 GM Engine LPG Fuel System Diagnosis
- Section 4. Boom & Platform
- Section 5. Hydraulics
- Section 6. JLG Control System
- Section 7. Basic Electrical information & schematics
SECTION 3 - CHASSIS & TURNTABLE
3121139 – JLG Lift – 3-13
Troubleshooting
Table 3-2. Excessive Noise and/or Vibration
Item Description Action
Check oil level in reservoir
and oil supply to the motor.
Insufficient hydraulic fluid could lead to cavitation that would
cause system noise.
Fill the reservoir to the proper level and ensure that oil supply to
the motor is adequate and the lines are unobstructed.
Check for air in the system. Air trapped within the system lines, or the motor itself, could
result in cavitation that would cause system noise.
Ensure that all of the system lines and components are purged
of air.
Inspect the output shaft cou-
plings.
A loose or incorrect shaft coupling will produce vibrations that
could result in system noise.
Ensure that the correct coupling is used and that it fits properly
onto the shaft.
Inspect the output shaft
alignment.
Misaligned shafts create excessive frictional vibration that
could result in system noise.
Ensure that the shafts are properly aligned.
Hydraulic oil viscosity above
limits.
Viscosity above acceptable limits will result in cavitation that
would lead to system noise.
Replace hydraulic oil with appropriate fluid for operating condi-
tions.
Table 3-3. System Operating Hot
Item Description Action
Check oil level in reservoir
and oil supply to the pump.
Insufficient amount of hydraulic fluid will not meet the cooling
demands of the system.
Fill the reservoir to the proper level.
Inspect the heat exchanger,
(if so equipped).
If the heat exchanger fails, or becomes obstructed, it may not
meet the cooling demands of the system.
Ensure that heat exchanger is receiving adequate air flow and
that the heat exchanger is in good operating condition. Repair
or replace as necessary.
Check the system relief
valves.
If a system relief valve becomes unseated for an extended
period of time or fails for any other reason, the system could
become overheated.
Repair or replace any malfunctioning relief valves as applica-
ble and verify that the loads on the machine are not excessive.
Table 3-4. Won’t Shift or Slow to Start
Item Description Action
Check the signal line to the
servo control port.
Obstructed or restricted flow through the servo control signal
lines could result in slow shift or no shift conditions within the
motor.
Ensure that the signal lines are not obstructed or restricted and
that signal pressure is adequate to shift the motor.
Check that the correct supply
and drain orifices are prop-
erly installed, and are not
obstructed.
Supply and drain orifices determine the shift rate of the motor.
The smaller the orifice, the longer the time it takes to shift the
motor. Obstruction will also increase shift times.
Ensure that the proper control orifices are installed in the motor
and verify that they are not obstructed. Clean or replace as
necessary.