3948709 PLATE Caterpillar parts
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
Rating:
Alternative (cross code) number:
CA3948709
394-8709
3948709
CA3948709
394-8709
3948709
Weight: 0.14 pounds 0 kg.
EXCAVATOR,
Compatible equipment models: 3948709:
Number on catalog scheme:
2
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Information:
Probable Causes
Diagnostic codes
Speed demand input
Air intake and exhaust system
Glow plugs
Valve lash
Fuel supply
Fuel rail pump
Low compression (cylinder pressure)
Individual malfunctioning cylinder
Electronic unit injectorsRecommended Actions
Diagnostic Codes
Check for active diagnostic codes on the electronic service tool. Troubleshoot any active codes before continuing with this procedure.Speed Demand Input
Use the electronic service tool and observe the signal for the Speed Demand Input.
If the signal is erratic on a genset with an EMCP3 control panel, refer to Systems Operation, Troubleshooting, Testing and Adjusting, KENR8783.
If the signal is erratic on a genset with an MCS control panel, refer to the documentation for the PWM converter.
If the repairs do not eliminate the fault proceed to "Air Intake and Exhaust System".Air Intake and Exhaust System
Check the air filter restriction indicator, if equipped.
Ensure that the air filter is clean and serviceable.
Check the air intake and exhaust systems for the following defects:
Blockages
Restrictions
Damage to lines or hoses
If the repairs do not eliminate the fault proceed to "Glow Plugs".Glow Plugs
Check for proper operation of the glow plugs. Refer to Systems Operation, Testing and Adjusting, "Glow Plugs - Test".
If the repairs do not eliminate the fault refer to "Valve Lash".Valve Lash
Check the valve lash and reset the valve lash if it is necessary. Refer to Systems Operation, Testing and Adjusting, "Engine Valve Lash - Inspect and Adjust".
If the repair does not eliminate the fault proceed to "Fuel Supply".Fuel Supply
Visually check the fuel tank for fuel. The fuel gauge may be faulty.
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).
Check the primary filter/water separator for water in the fuel.
Check for fuel supply lines that are restricted.
Check that the low pressure fuel lines are tight and secured properly.
Check the fuel filters.
Check the diesel fuel for contamination. Refer to Systems Operation, Testing and Adjusting, "Fuel Quality - Test".
Check for air in the fuel system. Refer to Systems Operation, Testing and Adjusting, "Air in Fuel - Test".
Ensure that the fuel system has been primed. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Prime".
Check the fuel pressure. Refer to Systems Operation, Testing and Adjusting, "Fuel System Pressure - Test".
If the repair does not eliminate the fault refer to "Fuel Rail Pump".Fuel Rail Pump
Note: The fuel rail pump that is installed by the factory on the C6.6 engine is a nonserviceable item. If any mechanical fault or any electrical fault occurs within the fuel rail pump then the fuel rail pump must be replaced.
Use the electronic service tool to select the correct screen display. Refer to Troubleshooting, "Troubleshooting with a Diagnostic Code".
If the fault is not eliminated, refer to "Low Compression (Cylinder Pressure)".Low Compression (Cylinder Pressure)
Perform a compression test. Refer to Systems Operation, Testing and Adjusting, "Compression - Test ".
If low compression is noted on any cylinders, investigate the cause and rectify the cause.Possible causes of low compression are shown in the following list:
Loose glow plugs
Faulty piston
Faulty piston rings
Worn cylinder bores
Worn valves
Faulty cylinder head gasket
Damaged cylinder head
Perform all necessary
Diagnostic codes
Speed demand input
Air intake and exhaust system
Glow plugs
Valve lash
Fuel supply
Fuel rail pump
Low compression (cylinder pressure)
Individual malfunctioning cylinder
Electronic unit injectorsRecommended Actions
Diagnostic Codes
Check for active diagnostic codes on the electronic service tool. Troubleshoot any active codes before continuing with this procedure.Speed Demand Input
Use the electronic service tool and observe the signal for the Speed Demand Input.
If the signal is erratic on a genset with an EMCP3 control panel, refer to Systems Operation, Troubleshooting, Testing and Adjusting, KENR8783.
If the signal is erratic on a genset with an MCS control panel, refer to the documentation for the PWM converter.
If the repairs do not eliminate the fault proceed to "Air Intake and Exhaust System".Air Intake and Exhaust System
Check the air filter restriction indicator, if equipped.
Ensure that the air filter is clean and serviceable.
Check the air intake and exhaust systems for the following defects:
Blockages
Restrictions
Damage to lines or hoses
If the repairs do not eliminate the fault proceed to "Glow Plugs".Glow Plugs
Check for proper operation of the glow plugs. Refer to Systems Operation, Testing and Adjusting, "Glow Plugs - Test".
If the repairs do not eliminate the fault refer to "Valve Lash".Valve Lash
Check the valve lash and reset the valve lash if it is necessary. Refer to Systems Operation, Testing and Adjusting, "Engine Valve Lash - Inspect and Adjust".
If the repair does not eliminate the fault proceed to "Fuel Supply".Fuel Supply
Visually check the fuel tank for fuel. The fuel gauge may be faulty.
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).
Check the primary filter/water separator for water in the fuel.
Check for fuel supply lines that are restricted.
Check that the low pressure fuel lines are tight and secured properly.
Check the fuel filters.
Check the diesel fuel for contamination. Refer to Systems Operation, Testing and Adjusting, "Fuel Quality - Test".
Check for air in the fuel system. Refer to Systems Operation, Testing and Adjusting, "Air in Fuel - Test".
Ensure that the fuel system has been primed. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Prime".
Check the fuel pressure. Refer to Systems Operation, Testing and Adjusting, "Fuel System Pressure - Test".
If the repair does not eliminate the fault refer to "Fuel Rail Pump".Fuel Rail Pump
Note: The fuel rail pump that is installed by the factory on the C6.6 engine is a nonserviceable item. If any mechanical fault or any electrical fault occurs within the fuel rail pump then the fuel rail pump must be replaced.
Use the electronic service tool to select the correct screen display. Refer to Troubleshooting, "Troubleshooting with a Diagnostic Code".
If the fault is not eliminated, refer to "Low Compression (Cylinder Pressure)".Low Compression (Cylinder Pressure)
Perform a compression test. Refer to Systems Operation, Testing and Adjusting, "Compression - Test ".
If low compression is noted on any cylinders, investigate the cause and rectify the cause.Possible causes of low compression are shown in the following list:
Loose glow plugs
Faulty piston
Faulty piston rings
Worn cylinder bores
Worn valves
Faulty cylinder head gasket
Damaged cylinder head
Perform all necessary
Caterpillar parts catalog:
Parts plate Caterpillar catalog:
14G, 215, 215B, 215C, 215D, 225, 225D, 229, 229D, 231D, 235, 235B, 235C, 235D, 245, 245B, 24H, 24M, 307C, 311C, 311D LRR, 311F LRR, 312, 312B L, 312C, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 3...
311, 311B, 311C, 312, 312B, 313D2 LGP, 315, 315B, 315B FM L, 315B L, 315C, 315D L, 316E L, 317, 317B LN, 318B, 318D L, 318D2 L, 320 L, 320N, OEMS
311, 311B, 311C, 311D LRR, 311F LRR, 312, 312B L, 312C, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313B, 313D, 313D2, 313D2 LGP, 314C, 314D LCR, 314E CR, 314E LCR, 315, 316E L, 320D...
315, 315B, 315B L, 315C, 315D L, 316E L, 317, 317B LN, 318B, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320 L, 320B, 320B FM LL, 320B U, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM ...
311C, 311D LRR, 311F LRR, 312C, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D, 313D2, 313D2 LGP, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR, 315C, 315D L, 316E L, 318B, 318C, 318D...
311C, 313D2 LGP, 315C, 315D L, 316E L, 318B, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320B, 320B FM LL, 320B L, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 32...
1290T, 1390, 2491, 2590, 307C, 307D, 307E, 308C, 308D, 308E, 308E CR, 308E SR, 308E2 CR, 311D LRR, 311F LRR, 312C, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D, 313D2, 313D2 LGP, 314D CR...
1372853
PLATE AS
311B, 311C, 311D LRR, 311F LRR, 312B, 312C L, 312D, 312D L, 312D2, 312E, 312E L, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR
311B, 311C, 311D LRR, 311F LRR, 312B, 312C L, 312D, 312D L, 312D2, 312E, 312E L, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR
311C, 313D2 LGP, 315C, 315D L, 316E L, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C L, 320D, 320D FM, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 3...
311C, 313D2 LGP, 315C, 315D L, 316E L, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C L, 320D, 320D FM, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 3...
2041086
PLATE
311C, 311D LRR, 311F LRR, 312C, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D, 313D2, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR
311C, 311D LRR, 311F LRR, 312C, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D, 313D2, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR
3168846
PLATE
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
3948706
PLATE AS
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
3916305
PLATE AS
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP
3491841
PLATE-STOP
318E L, 320E L, 320E LN, 320E LRR, 323E L, 324E L, 324E LN, 329E L, 329E LN, 336E, 336E L, 336E LH, 336E LN, 336F L, 349E L, 349E L VG, 349F L
318E L, 320E L, 320E LN, 320E LRR, 323E L, 324E L, 324E LN, 329E L, 329E LN, 336E, 336E L, 336E LH, 336E LN, 336F L, 349E L, 349E L VG, 349F L
3967576
PLATE-WEAR
318E L
318E L
3967575
PLATE-WEAR
318E L
318E L
3967574
PLATE-WEAR
318E L
318E L
3886771
PLATE AS
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
3987981
PLATE AS
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
3976715
PLATE AS
312D2, 312D2 GC, 313D2
312D2, 312D2 GC, 313D2
3990966
PLATE
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 318D2 L
3937684
PLATE AS
312D2
312D2
3937683
PLATE AS
312D2
312D2