GUARD GROUP (Right Hand) 2S8277 - Caterpillar

Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group" for the instructions that are needed to use the 1U-5470 Engine Pressure Group. Refer to Operation Manual, NEHS0818, "Using the 198-4240 Pressure Indicator Tool Gp" for the instructions that are needed to use the 198-4240 Pressure Indicator Tool Gp.
Illustration 1 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 4
Most Recent Required Tools
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4237 Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi))
A2 1 198-4238(1) Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi))
A2 1 198-4239 Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi))
A2 1 251-9600(2) Pressure Sensor Gp
(0 to 68,900 kPa (0 to 10,000 psi))
A3 1 198-4236 Adapter Cable As
(1) This sensor must be purchased separately and is not included in the 198-4240 Digital Pressure Indicator Gp
(2) This sensor can only be used on large diameter pressure taps like 6V-3965 Fitting.Test Preparation
Remove all covers that obscure the air inlet and exhaust systems.Test Procedures
Air Inlet Restriction
There will be a reduction in the performance of the engine if there is a restriction in the air inlet system or the exhaust system.
Inspect the engine air cleaner inlet and ducting in order to ensure that the passageway is not blocked or collapsed.
Inspect the engine air cleaner element. Replace a dirty engine air cleaner element with a clean engine air cleaner element.
Check for dirt tracks on the clean side of the engine air cleaner element. If dirt tracks are observed, contaminants are flowing past the engine air cleaner element and/or the seal for the engine air cleaner element.
Use the differential pressure gauge of the 198-4240 Digital Pressure Indicator Gp.
Illustration 2 g01099496
Right side view of engine
(1) Air cleaner
(2) Test location
Connect the vacuum port of the differential pressure gauge to test location (2). Test location (2) can be located anywhere along the air inlet piping after the engine air cleaner but before the turbocharger.
Leave the pressure port of the differential pressure gauge open to the atmosphere.
Start the engine. Run the engine in the no-load condition at high idle.
Record the value.
Multiply the value from Step 4.d by 1.8.
Compare the result from Step 4.e to the appropriate values that follow. The air flow through a used engine air cleaner may have a restriction. The air flow through a plugged engine air cleaner will be restricted to some magnitude. In either case, the restriction must not be more than the following amount: Maximum restriction ... 6.2 kPa (25 in of H2O)The air flow through a new engine air cleaner element must not have a restriction of more than the following amount: Maximum restriction ... 3.7 kPa (15 in of H2O)Exhaust Restriction
Back pressure is the difference in the pressure between the exhaust at the outlet elbow and the atmospheric air.Use the differential pressure gauge of the 198-4240 Digital Pressure Indicator