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
3-156 – JLG Lift – 3121139
Table 3-12. LPF Fuel System Diagnosis
STEP ACTION VALUE(S) YES NO
1 Were you referred to this procedure by a DTC diagnostic chart? - - Go to Step 3 Go to Step 2
2 Perform the On Board Diagnostic (OBD) System Check.
Are any DTCs present in the ECM?
- - G o t o t h e
applicable DTC Table
Go to Step 3
3 Verify that the LPG fuel tank has a minimum of 1/4 tank of fuel, that the manual
valve is open and the tank quick connect is fully engaged
Does the vehicle have fuel?
- - Go to Step 4 - -
4 1. Connect a water column gauge or a manometer to the secondary test port of
the low pressure regulator (LPR).
2. Start the engine and allow it to reach operating temperature.
Does the engine start and run?
- - Go to Step 5 Go to Step 8
5 With the engine idling, observe the pressure reading for the LPR secondary
pressure.
Does the fuel pressure fluctuate rhythmically OUTSIDE the specified range?
-1.0" to
-2.0" w.c
Go to Step 25 Go to Step 6
6 1. Disconnect the EPR electrical connectors. NOTE: This action will cause a
DTC to be set by the ECM
2. With the engine idling observe the pressure reading on the secondary test
port.
Is the fuel pressure WITHIN the specified range?
-1.0" to
-2.0" w.c
Go to Fuel Control
System Diagnosis
Go to Step 7
7 1. Inspect the air intake stream between the mixer assembly and the throttle
body for leaks.
2. Inspect the fuel hose connection between the LPR and mixer assembly for
damage or leakage.
3. Inspect any vacuum hoses for leaks
Was a problem found and corrected?
- - Go to Step 26 Go to Step 22
8 1. Connect a water column gauge or a manometer to the secondary test port of
the low pressure regulator (LPR).
2. Crank the engine and observe the pressure reading for the LPR secondary
pressure.
Does the f ue l pressure i nd icate a vacu um is pr es ent?
- - Go to Step 12 Go to Step 9
9 1. Remove Air induction hose to the mixer
2. Observe the air valve for movement while the engine is cranking. Note: Move-
ment of the air valve will be minimal at cranking speeds.
Does the air valve mo ve wh en the engi ne is cr anked?
- - Go to Step 11 Go to Step 10
10 1. Inspect the air intake stream to the mixer assembly and the throttle body for
vacuum leaks.
2. Inspect the vacuum hoses from the mixer for proper connection and condition.
Was a problem found and repaired?
- - Go to Step 26 Go to Step 24
11 Inspect the fuel hose connection between the LPR and the mixer assembly for
damage or leakage.
Was a problem found and repaired?
- - Go to Step 26 Go to Step 12
12 1. Connect a 0-10 psi gauge to the primary test port of the low pressure regulator
(LPR).
2. Crank the engine and observe the pressure reading for the LPR primary pres-
sure.
Is the fuel pressure ABOVE the specified value?
1- 3 PSI Go to Step 22 Go to Step 13