BELT TIGHTENER GP 3803120 - Caterpillar

3803120 BELT TIGHTENER GP Caterpillar parts 777G

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Alternative (cross code) number:
CA3803120
380-3120
3803120

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Genuine Northern Lights 38-03120 Standard Spare Parts Kit for M843NW2 and M843NW3 Generators (H.E.C)

$576.54

18 Aug 2025
15.0[6.75] pounds
US: Diesel Parts Di

Genuine Northern Lights 38-03120 Standard Spare Parts Kit for M843NW2 and M843NW3 Generators (H.E.C)
Northern Lights Candles This kit includes the following parts: 4 Oil Filters 2 Fuel Filters 1 Drive Belt 1 Air Filter Element 1 Thermostat 1 Rocker Arm Cover Gasket 1 Thermostat Cover Gasket 2 Impellers with Gasket & O-Rings 2 Sea Water Pumps Cover O-Rings || 6-month manufacturer warranty

$640.60

10 Jun 2025
15.0[6.75] pounds
US: Diesel Parts Di

$659.99

20 Apr 2025
15.0[6.75] pounds
US: Diesel Parts Di

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#34466 3803120

2016-12-01

Number on catalog scheme: 18

Caterpillar 3803120 Parts scheme BELT TIGHTENER GP

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Compatible equipment models: 3803120:

TRUCK 777G Caterpillar

Information:

Illustration 1 g01018959
Typical example (1) 215-3198 O-Ring Seal (2) 237-3800 O-Ring Seal Dimensions of the 215-3198 O-Ring Seal provide a more precise fit than the previous 9X-7557 O-Ring Seal. The new dimensions produce the following results:
Improve resistance to damage during seal installation.
Improve resistance to damage during engine operation which can result in fuel dilution of the engine oil.The 215-3198 O-Ring Seal is also made from a carbon black filled fluorocarbon (FKM) material with a purple PTFE coating for easier installation. The improved seal material produces the following results:
Improve resistance to loss of sealing force for longer seal life.
Improve resistance to fuel system pressure and damage from extrusion for longer seal life.The 237-3800 O-Ring Seal retains the same dimensions as the previous 9X-7557 O-Ring Seal. The 237-3800 O-Ring Seal is made from a mineral filled fluorocarbon (FKM) material with a red PTFE coating for easier installation. The 237-3800 O-Ring Seal will migrate at a later date to the carbon black filled fluorocarbon (FKM) material.Note: The 215-3198 O-Ring Seal and the 237-3800 O-Ring Seal are not dimensionally interchangeable. The seals should only be used on the machine engines that are described above.In addition, new seal kits for the fuel injectors have been redesigned in order to include the new seal part numbers. The new kits will be direct replacements for the previous kits. Refer to your Parts Manual in order to determine the correct seal kit for your application. Table 1 lists the new part numbers for the kits.
Table 1
New Gasket and Seal Kits
Engine Model Part Number Contents Replaced Kit
C-12
3196 224-5797 (1) 215-3198
119-8784
9X-7317 O-Ring Seals 193-3325
3176
3176C 223-5850 (1) 215-3198
9X-7722
9X-7317 O-Ring Seals -
3126B 242-1539 (1) 237-3800
150-4105
149-5240
148-2903
133-3715
109-3207 O-Ring Seals 196-6934
224-5358
( 1 ) Check SIS Kits or TMI Kits for the latest application information of the gasket kit.