JLG 450A_AJ Series II Service Manual - Manual (Page 178)

SECTION 3 - CHASSIS & TURNTABLE
3-128 – JLG Lift – 3121180
Electronic Pressure Regulator (EPR)
Assembly Replacement
The EPR assembly consists of two separate components.
The Voice Coil Section is not serviceable and can only be
replaced as an assembly. The pressure regulator section
is serviceable and is detailed in this section.
REMOVAL
1. Relieve propane fuel system pressure. Refer to Pro-
pane Fuel System Pressure Relief.
2. Disconnect negative battery cable.
3. Slowly remove fuel inlet fitting at Electric Lock Off.
NOTE: Fuel system will have residual vapor pressure.
4. Disconnect electrical connector from Electric Lock Off.
5. Remove Electric Lock Off from regulator.
6. Remove lock pin from vapor fitting on regulator
housing. Remove fitting and hose. Retain pin.
7. Remove lock pin from pressure sensor on regulator
housing and remove sensor. Retain pin.
8. Pinch off hoses on coolant lines to regulator using
clamp pliers.
9. Remove lock pin water fittings on regulator housing.
Remove fittings and hoses. Retain pin.
10. Disconnect EPR electrical connector
11. Remove three nuts from EPR isolators and EPR
mounting bracket
12. Remove EPR from bracket
13. Remove three mounting isolators.
INSTALLATION
DO NOT USE TEFLON TAPE ON ANY FUEL FITTING. USE A LIQUID
PIPE THREAD SEALANT WHEN INSTALLING FITTINGS.
CHECK ALL O-RINGS ON VAPOR AND WATER FITTINGS FOR ANY
DAMAGE. REPLACE IF NECESSARY.
LUBE ALL O-RINGS WITH AN O-RING LUBE BEFORE INSTALLING.
1. Install three rubber isolators to bottom of EPR
2. Install EPR assembly to bracket and tighten retain-
ing nuts.
NOTE: Do not over tighten the isolators and cause a separa-
tion of the isolators.
3. Install fuel temperature sensor into regulator open-
ing and lock in place with locking pin. Connect elec-
trical connector.
4. Insert fuel vapor line and fitting into regulator port.
Lock in place with locking pin.
5. Install water hoses and fittings into regulator. Lock in
place with locking pin. Remove clamp pliers from
hoses.
6. Install electric lock off into regulator inlet and tighten
into proper location. Connect electrical connector.
7. Connect fuel supply line and tighten until fully
seated.
8. Connect EPR electrical connector.
9. Open manual valve.
10. Start vehicle and leak check propane fuel system at
each serviced fitting. Refer to Propane Fuel System
Leak Test.
1. Pressure Regulator Section
2. Fuel Inlet
3. Coolant Passage 4. Primary Test Port
5. Secondary Test Port
6. Voice Coil Section
Figure 3-87. EPR Assembly
Figure 3-88. Pressure Regulator Section