JLG 740AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-192 3121160
Electronic Pressure Regulator (EPR) Assembly
Replacement
The EPR assembly is a made up of two separate components.
The Voice Coil Section is not serviceable and can only be
replaced as an assembly. The pressure regulator section is ser-
viceable and will be detailed in this section.
REMOVAL
1. Relieve the propane fuel system pressure. Refer to Pro-
pane Fuel System Pressure Relief.
2. Disconnect the negative battery cable.
3. Slowly remove the fuel inlet fitting at the Electric Lock
Off.
NOTE: Residual vapor pressure will be present in the fuel system.
4. Disconnect the electrical connector to the Electric Lock
off .
5. Remove the Electric Lock Off from the regulator.
6. Remove the lock pin from the vapor fitting on the regu-
lator housing and remove the fitting and hose and
retain the pin.
7. Remove the lock pin from the pressure sensor on the
regulator housing and remove the Sensor and retain the
pin.
8. Using a clamp pliers pinch off the hoses on the coolant
lines to the regulator
9. Remove the lock pin from both the water fittings on the
regulator housing and remove the fittings and hoses
and retain the pin
10. Disconnect the EPR electrical connector
11. Remove the (3) three nuts from the EPR isolators and the
EPR mounting bracket
12. Remove the EPR from the bracket
13. Remove the (3) three mounting isolators
INSTALLATION
DO NOT USE TEFLON TAPE ON ANY FUEL FITTING. USE A LIQUID PIPE THREAD
SEALANT WHEN INSTALLING FITTINGS.
CHECK ALL THE O-RINGS ON THE VAPOR AND WATER FITTINGS FOR ANY DAM-
AGE REPLACE IF NECESSARY.
LUBE ALL THE O-RINGS WITH AN O-RING LUBE BEFORE INSTALLING.
1. Install the three (3) rubber isolators to the bottom of the
EPR
2. Install the EPR assembly to the bracket and tighten the
retaining nuts.
NOTE: Do not over tighten the isolators and cause a separation of
the isolators.
3. Install the fuel temperature sensor into the regulator
opening and lock in place with the locking pin, connect
the electrical connector.
4. Insert the fuel vapor line and fitting into the regulator
port and lock in place with the locking pin.
5. Install both the water hoses and fittings into the regula-
tor and lock in place with the locking pin remove the
clamp pliers from the hoses.
6. Install the electric lock off into the regulator inlet and
tighten into proper location, connect the electrical con-
nector.
7. Connect the fuel supply line and tighten until fully
seated.
8. Connect the EPR electrical connector.
9. Open the manual valve.
1. Pressure Regulator Section
2. Fuel Inlet
3. Coolant Passage
4. Primary Test Port
5. Secondary Test Port
6. Voice Coil Section
Figure 3-105. EPR Assembly