ACCUMULATOR GP-HYDRAULIC 2112069 - Caterpillar

Illustration 1 g02023390
(1) Fuel temperature sensor
(2) Fuel sampling port
(3) Fuel pressure sensor
(4) Fuel filter baseNote: Do not use the fuel sampling port (2) for measuring the pressure. Follow the steps below.
Table 4
Engine RPM Fuel pressure from Cat ET Fuel pressure from the mechanical gauge
800
1800
Table 5
Troubleshooting Test Steps Values Results
4. Check the Fuel Pressure Sensor
A. Record the fuel pressure from Cat ET. Record the data in Table 4.
B. Remove the fuel pressure sensor (3).
C. Install a 8T-7860 Connector into the port of the pressure sensor (3).
D. Install the 110-6349 Fitting as onto the 8T-7860 Connector.
E. Install a 8T-0855 Pressure Gauge onto a 6V-3990 Coupler.
F. Install the 6V-3990 Coupler onto the 110-6349 Fitting as.
G. Record the fuel pressure on the pressure gauge. Record the data in Table 4.
Fuel Pressure Sensor
Result: The gauge value of the fuel pressure is within 137 kPa (20 psi) of the fuel pressure reading shown in ET.
Proceed to Test Step 5.
Result: The gauge value of the fuel pressure is not within 137 kPa (20 psi) of the fuel pressure reading shown in ET.
Repair: Replace the fuel pressure sensor.
If the problem is not resolved, proceed to Test Step 5.
Verify that the recorded fuel pressure is above the minimum acceptable fuel specifications. Refer to Table 6 for the minimum acceptable specifications.
Table 6
Engine RPM Minimum acceptable fuel pressure
800 360 kPa (52 psi)
1800 450 kPa (65 psi)
Table 7
Troubleshooting Test Steps Values Results
5. Verify that the Fuel Pressure Is Within Specifications
Fuel Pressure
Result: The fuel pressure is above the minimum acceptable fuel specifications.
Proceed to Test Step 7.
Result: The fuel pressure is not above the minimum acceptable fuel specifications.
Proceed to Test Step 6.
6. Replace the Fuel Filters
A. Replace the primary filter, the secondary filter, and the tertiary fuel filters.
Note: The fuel system will need to be primed after the filters are replaced.
B. Verify that the fuel pressure is above the minimum acceptable pressure specifications. Refer to Table 6 for the proper specifications.
Fuel Filters
Result: The fuel pressure meets the minimum acceptable fuel pressure specifications.
Return the engine to service.
STOP
Result: The fuel pressure does not meet the minimum acceptable fuel pressure specifications.
Proceed to Test Step 7.
7. Check for Air in the Fuel System
A. Check for air in the fuel. Refer to Systems Operation/Testing and Adjusting, "Air in Fuel - Test" for the proper procedure.
Air
Result: Air is in the system.
Repair: Refer to Systems Operation/Testing and Adjusting, "Air in Fuel - Test" for the proper repairs.
If the problem is not resolved, proceed to Test Step 8.
Result: Air is not in the system.
Proceed to Test Step 8.
Illustration 2 g02025071
(5) Anti-drain check valve
(6) Fuel return pressure regulator
Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Table 8
Troubleshooting Test Steps Values Results
8. Replace the Fuel Return Pressure Regulator
A. Replace the fuel return pressure regulator.
B. Inspect the anti-drain check valve for proper operation.
C. Check the fuel pressure with Cat