拆卸和安裝約翰迪爾燃油系統高低壓調節閥、燃油切斷電磁閥故障診斷測試及相關部件拆裝技巧
Remove and Install Low Pressure Regulating Valve
1. Close fuel shut-off valve, if equipped.
NOTE: On high fuel tank applications without fuel shut-off valve, fuel tank return line must be pinched before disconnecting, then plugged,
2. Disconnect fuel tank return line from filter housing and drain fuel into clean container.
3. Remove low pressure regulating valve parts (A—G).
To remove valve seat (B), use a standard wire tie strap with approximate 5/16 x 3/16 inch square head. Insert tie strap head through bore of valve seat, rotate to  catch lip of seat and remove seat.
4. Clean and inspect all parts. Replace all O-rings and seals.
Low Pressure Regulating Valve
5. Install parts in reverse order.
Install valve seat (B) (O-ring end first) into bore of filter housing. Make sure it is firmly seated in  bore.
A—O-Ring B—Valve Seat
Valve Components
Install seal (D) with tapered edge of seal into lip of regulating valve (C).
Spring (E) is color coded red, identifying it as the low pressure spring.
Tighten valve housing (G) to specifications.
—Low Pressure Regulating Valve D—Seal
E—Spring, Low Pressure (Color Coded Red) F—O-Ring
G—Valve Housing
Specification
Low Pressure Regulating
Valve-to-Filter Housing—Torque .....................................  18 N•m (13 lb-ft)

Remove and Install High Pressure Regulating Valve
1. Close fuel shut-off valve, if equipped.
NOTE: On high fuel tank applications without fuel shut-off valve, fuel tank return line must be pinched before disconnecting, then plugged,
2. Disconnect fuel tank return line from filter housing and drain fuel into clean container.
3. Open valve on water separator bowl and drain filter housing.
4. Remove fuel temperature sensor (F). See REMOVE AND INSTALL FUEL TEMPERATURE SENSOR in Group 110.
5. Remove high pressure regulating valve (C).
6. To remove screen (A), see REMOVE AND INSTALL 100 MICRON INTERNAL FILTER HOUSING SCREEN INSERT next in this Group.
NOTE: High pressure regulating valve is not repairable. Do not disassemble valve. If defective, replace entire assembly.
7. Clean and inspect all parts. Replace all O-rings.
8. Install parts in reverse order.
If removed, install screen (A). See REMOVE AND INSTALL 100 MICRON INTERNAL FILTER HOUSING
SCREEN INSERT next in this Group. Tighten regulating valve to specifications.
High Pressure Regulating Valve
A—Screen B—O-Ring
C—High Pressure Regulating Valve D—O-Ring
E—O-Ring
F—Fuel Temperature Sensor
Specification
High Pressure Regulating
Valve-to-Filter Housing—Torque .................................. 14 N•m (124 lb-in.)
9. Install fuel temperature sensor (F). See REMOVE AND INSTALL FUEL TEMPERATURE SENSOR in Group 110.
10. Add fuel to filter housing between minimum and maximum marks on housing. Fuel can be added by throttling the fuel shut-off valve (if equipped), or by removing cover and adding fuel from a clean container.

Remove and Install 100 Micron Internal Filter Housing Screen Insert
1. Remove fuel temperature sensor (F). See REMOVE AND INSTALL FUEL TEMPERATURE SENSOR in Group 110.
Remove high pressure regulating valve (C). See REMOVE AND INSTALL HIGH PRESSURE
REGULATING VALVE earlier in this Group.
IMPORTANT: If allen wrench is pushed too far into 10 micron screen during removal and installation, screen may be damaged.
Tie a rubber band (K) approximately 10 mm (3/8 in.) from end of allen wrench, as shown, to prevent screen damage.
NOTE: Screen is approximately 91 mm (3-5/8 in.) up in bore of filter housing. Use a long allen  wrench.
2. Attach a rubber band (K) on end of 5 mm allen wrench and remove 10 micron screen (A) from filter  housing.
3. Clean and inspect screen.
4. Using allen wrench with rubber band, install screen in filter housing and tighten to the following specification.
Specification
100 Micron Internal Filter Housing
Screen—Torque ............................................................... 5 N•m (44 lb-in.)
High Pressure Regulating Valve
5. Install pressure regulating valve parts (B—D). See REMOVE AND INSTALL HIGH PRESSURE REGULATING VALVE earlier in this Group. Install fuel temperature sensor parts (E) and (F). See REMOVE AND INSTALL FUEL TEMPERATURE SENSOR in Group 110.
Remove Screen
A—100 Micron Screen B—O-Ring
C—High Pressure Regulating Valve D—O-Ring
E—O-Ring
F—Fuel Temperature Sensor K—Allen Wrench with Rubber Band

Remove and Install Fuel Filter Check Valve
1.  Close fuel shut-off valve (if equipped).
2. Disconnect fuel line (shown disconnected) and remove check valve (B). Remove O-rings (A) and (C) from both ends of check valve.
3. Install check valve in filter housing and tighten to specifications.
Specification
Fuel Filter Check Valve to Fuel
Filter Housing—Torque ...................................................  33 N•m (24 lb-ft)
4.  Connect fuel line and tighten to specifications.
Specification
Fuel Line-to-Fuel Filter Check Valve—Torque.................................................................  24 N•m (18 lb-ft)
5.  Open fuel shut-off valve.

Remove and Install Primer Pump
1. Remove primer pump (A).
2. If required, remove adapter (B).
3. Clean and inspect parts.
4. Install primer pump and adapter with new O-rings and tighten to specifications.
Specification
Fuel Primer (Single Rail Fuel Primer Pump
System)—Torque.......................................................... 14 N•m (124 lb-in.)
Fuel Primer-to-Fuel Filter Housing A—Primer Pump
Adapter (Single Rail Fuel B—Adapter
System)—Torque............................................................ 11 N•m (97 lb-in.)

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