6V6638 SEAL-O-RING Caterpillar parts
784B, 784C, 785, 785B, 785C, 785D, D9R
Rating:
Alternative (cross code) number:
CA6V6638
6V-6638
6V6638
CA6V6638
6V-6638
6V6638
Weight: 0.01 pounds 0 kg.
Information:
CROSS SECTION DIAMETER
6.99
mm
DASH SIZE
456
ID
342.27
mm
MATERIAL
Fluorocarbon Rubber (FKM) 75 Duro
OD
0
mm
TRACK-TYPE TRACTOR, TRUCK,
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Compatible equipment models: 6V6638:
Information:
Initial Inspection of the Fuel System
A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.
Check the fuel level in the fuel tank. Inspect the cap for the fuel tank. Ensure that the vent in the fuel cap is not filled with dirt.
Check all fuel lines for fuel leakage. The fuel lines must be free from restrictions and faulty bends. Verify that the fuel return line is not collapsed.
Clean the screen inside the inlet fitting of the fuel transfer pump.
Operate the hand priming pump (if equipped). If excessive resistance is felt, inspect the fuel pressure regulating valve. Make sure that the pressure regulator is installed correctly, and make sure that the pressure regulator functions correctly.
Install a new fuel filter.
Cut the old filter open with the 175-7546 Oil Filter Cutter Gp. Inspect the filter for excess contamination. Determine the source of the contamination. Make the necessary repairs.
Service the primary fuel filter (if equipped).
Operate the hand priming pump (if equipped). If uneven resistance is felt, test for air in the fuel. Refer to Testing and Adjusting, "Air in Fuel - Test" for more information.
Remove any air that may be in the fuel system. Refer to Testing and Adjusting, "Fuel System - Prime".Inspection of the Fuel System during Engine Operation
Either too much fuel for combustion or not enough fuel for combustion can be the cause of a problem in the fuel system. Finding the source of the problem can be difficult, especially when you have smoke that rises from the exhaust. Therefore, work is often done on the fuel system when the problem is really with some other part of the engine.When noticeable smoke rises from the exhaust, this problem can be caused by a damaged unit injector. This unusual smoke can also be caused by one or more of the reasons that follow:
Not enough air for good combustion
An overload at high altitude
Oil leakage into combustion chamber
Altitude
Air inlet and exhaust leaksNote: Refer to Troubleshooting for more information on the fuel system.Checking The Operation Of Individual Cylinders
Low temperature at an exhaust manifold port is an indication of no fuel to the cylinder. This can possibly be an indication of an injector with a defect. An extra high temperature at an exhaust manifold port can be an indication of too much fuel to the cylinder. High temperatures may also be caused by an injector with a defect.Refer to Testing And Adjusting, "Exhaust Temperature - Test" for the procedure for checking the temperatures in the exhaust manifold port.
A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.
Check the fuel level in the fuel tank. Inspect the cap for the fuel tank. Ensure that the vent in the fuel cap is not filled with dirt.
Check all fuel lines for fuel leakage. The fuel lines must be free from restrictions and faulty bends. Verify that the fuel return line is not collapsed.
Clean the screen inside the inlet fitting of the fuel transfer pump.
Operate the hand priming pump (if equipped). If excessive resistance is felt, inspect the fuel pressure regulating valve. Make sure that the pressure regulator is installed correctly, and make sure that the pressure regulator functions correctly.
Install a new fuel filter.
Cut the old filter open with the 175-7546 Oil Filter Cutter Gp. Inspect the filter for excess contamination. Determine the source of the contamination. Make the necessary repairs.
Service the primary fuel filter (if equipped).
Operate the hand priming pump (if equipped). If uneven resistance is felt, test for air in the fuel. Refer to Testing and Adjusting, "Air in Fuel - Test" for more information.
Remove any air that may be in the fuel system. Refer to Testing and Adjusting, "Fuel System - Prime".Inspection of the Fuel System during Engine Operation
Either too much fuel for combustion or not enough fuel for combustion can be the cause of a problem in the fuel system. Finding the source of the problem can be difficult, especially when you have smoke that rises from the exhaust. Therefore, work is often done on the fuel system when the problem is really with some other part of the engine.When noticeable smoke rises from the exhaust, this problem can be caused by a damaged unit injector. This unusual smoke can also be caused by one or more of the reasons that follow:
Not enough air for good combustion
An overload at high altitude
Oil leakage into combustion chamber
Altitude
Air inlet and exhaust leaksNote: Refer to Troubleshooting for more information on the fuel system.Checking The Operation Of Individual Cylinders
Low temperature at an exhaust manifold port is an indication of no fuel to the cylinder. This can possibly be an indication of an injector with a defect. An extra high temperature at an exhaust manifold port can be an indication of too much fuel to the cylinder. High temperatures may also be caused by an injector with a defect.Refer to Testing And Adjusting, "Exhaust Temperature - Test" for the procedure for checking the temperatures in the exhaust manifold port.
Cat SIS web machinery list:
Parts seal Caterpillar catalog:
3T6604
SEAL GP-DUO-CONE
769C, 769D, 771C, 771D, 785
769C, 769D, 771C, 771D, 785
4T4806
SEAL
785
785
1043153
SEAL-LIP TYPE
D9R, D9T
D9R, D9T
6P8369
SEAL
D8L, D9N, D9R, D9T
D8L, D9N, D9R, D9T
9G7127
SEAL
D8L, D9N, D9R, D9T
D8L, D9N, D9R, D9T
9X7487
SEAL AS-SHAFT
D10R, D10T, D10T2, D9R, D9T
D10R, D10T, D10T2, D9R, D9T
8T0208
SEAL-PIVOT SHAFT
D10N, D10R, D10T, D10T2, D8L, D9L, D9N, D9R, D9T
D10N, D10R, D10T, D10T2, D8L, D9L, D9N, D9R, D9T
1306889
SEAL GP-DUO-CONE
D10N, D10R, D9R
D10N, D10R, D9R
5P5520
SEAL-LIP TYPE (168.43MM OD)
824G, 824G II, 824H, 826G, 826G II, 826H, 844, 844H, 844K, D8L, D9N, D9R
824G, 824G II, 824H, 826G, 826G II, 826H, 844, 844H, 844K, D8L, D9N, D9R
8E8994
SEAL-RING
D10R, D10T, D10T2, D9R, D9T
D10R, D10T, D10T2, D9R, D9T
6V6557
SEAL-O-RING
784B, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D
784B, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D
1051885
SEAL AS
784B, 784C, 785B, 785C, 785D
784B, 784C, 785B, 785C, 785D
6D3080
SEAL
12F, 14E, 784B, 785, 785B
12F, 14E, 784B, 785, 785B
5T6597
SEAL
784B, 785B, 789B, 793B
784B, 785B, 789B, 793B
6V2657
SEAL-RING
785, 789, 793, 793B
785, 789, 793, 793B
6V2655
SEAL-RING
785, 789, 793, 793B
785, 789, 793, 793B
3298979
SEAL-U-CUP
784B, 784C, 785B, 785C, 785D
784B, 784C, 785B, 785C, 785D
9X7353
SEAL-LIP TYPE
784B, 784C, 785, 785B, 785C, 785D
784B, 784C, 785, 785B, 785C, 785D
8C9157
SEAL AS
784B, 784C
784B, 784C
6E6078
SEAL
784B, 784C
784B, 784C
9X7312
SEAL AS
784B, 793, 793B
784B, 793, 793B
9W6623
SEAL GP-DUO-CONE
330, 330 FM L, 350, 768C, 769C, 773B, 784B, 793, 793B, 793C, AD40, AE40
330, 330 FM L, 350, 768C, 769C, 773B, 784B, 793, 793B, 793C, AD40, AE40