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938G II Wheel Loader RTB00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... Page 1 of 27

Shutdown SIS Previous Screen
Product: WHEEL LOADER Model: 938G II WHEEL LOADER RTB Configuration: 938G II Wheel Loader RTB00001-UP (MACHINE) POWERED BY 3126B Engine

Special Instruction
Using the 8T-2700 Blowby/Air Flow Indicator {0774, 0781, 0785}
Media Number -SEHS8712-03 Publication Date -01/01/2005Date Updated -12/01/2005 i02104788

Using the 8T-2700 Blowby/Air Flow Indicator {0774, 0781, 0785}
SMCS - 0774; 0781; 0785 Caterpillar Products: All

Introduction
The 8T-2700 Blowby/Air Flow Indicator has a digital readout that is capable of displaying either volume or air flow. The blowby/air flow indicator displays Metric units. The blowby/airflow indicator also displays US Customaryunits. The blowby/air flow indicator can measure the exhaust gas that escapes from the crankcase. The gas that escapes is commonly known as blowby. Measuring the blowby helps the technician assess the condition of the cylinder, which can be very helpful in determining when engine repair is needed. The amount of blowby can be displayed in liters per minute or in cubic feet per hour. The blowby/air flowindicator can measure the airflow that passes through the radiator core. Measuring the airflow helps the technician locate areas in the radiator core that have become restricted. The rate of airflow can be displayed in meters per minute or in feet per minute.

Adaptability

https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw... 11/03/2010 PDF created withpdfFactory trial version www.pdffactory.com

938G II Wheel Loader RTB00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... Page 2 of 27

Illustration 1

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The 8T-2700 Blowby/Air Flow Indicator is adaptable to all Caterpillar Engines. Measurements of 3600 Series Engines also require a 1U-8860 Blowby Pickup Gp . The blowby/airflow indicator is adaptable to all radiators that havestraight cores.

8T-2700 Blowby/Airflow Indicator

Illustration 2

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(1) 6V-7145 Case with Decal, SEES5692 (2) The vinyl hose has an ID of 19.05 mm (0.75 inch). The wall thickness of the vinyl hose is 3 mm (0.125 inch). The length of the vinyl hose is 1524 mm (5 ft). The nipple is 12.7 mm (0.50 inch) malehttps://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw... 11/03/2010 PDF created with pdfFactory trial version www.pdffactory.com

938G II Wheel Loader RTB00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... Page 3 of 27 pipe by 19.05 mm (0.75 inch) with a 12.7 mm (0.5000 inch) hose clamp. (3) The bushing is 25.4 mm (1.00 inch) by 12.7 mm (0.50 inch). (4) The hose clamps have an operating range of 19.05 mm (0.75 inch) to 50.8 mm (2.00 inch).Two hose clamps are included. (5) 8T-2685 Blowby Pickup with Decal, SEES5694 (6) 8T-5297 Cable As (7) The bushing is 19.05 mm (0.75 inch) by 12.7 mm (0.50 inch). (8) The bushing is 32 mm (1.25 inch) by 12.7 mm (0.50 inch). (9) 8T-2701 Blowby Indicator As (10) The bushing is 38.1 mm (1.5 inch) by 12.7 mm (0.50 inch). (11) The 8T-2701 Blowby Indicator As comes with the following 4 Vinyl hoses.
lThe first vinyl hose has an ID of 22 mm (0.875 inch). The wall thickness is 3 mm (0.125 inch). The length of the hose is 102 mm (4 inch). The second hose has an ID of 6.35 mm (0.25 inch). The wall thickness is 5 mm (0.185 inch). The length of the hose is 102 mm (4 inch). The third hose has an ID of 38.1 mm (1.50 inch). The wall thickness is 5 mm (0.185 inch). The length of the hose is 102 mm (4inch) long. The fourth hose has an ID of 50.8 mm (2.00 inch). The wall thickness is 5 mm (0.185 inch). The length of the hose is 102 mm (4 inch).

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(12) The length of the PVC pipe is 305 mm (12 inch). The diameter of the PVC pipe is 12.7 mm (0.5 inch). There is also a PVC Schedule 40 Bushing. The optional items that are available are listed below:
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The 5P-7366 Power Cable...
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