3937978 BOOM & BEARING AS Caterpillar parts
336E, 336E L, 336E LH, 336E LN, 336F L
Rating:
Alternative (cross code) number:
CA3937978
393-7978
3937978
CA3937978
393-7978
3937978
EXCAVATOR,
Number on catalog scheme:
9
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Caterpillar parts catalog:
Information:
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A - Locking Pin
8 mm (0.31 inch) Ø by
85 mm (3.35 inch) 1
If the engine has guards, remove the guards. Refer to the Original Equipment Manufacture (OEM) for the correct procedure.Note: Mark the direction of rotation of the alternator belt if the belt will be reused.
Illustration 1 g02017213
Typical example
Install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction.
Insert Tooling (A) into Hole (Y).
Remove alternator belt (1) .
If necessary, install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction and remove Tooling (A) from Hole (Y) .
Release the pressure on the 1/2" square drive tool and remove the 1/2" square drive tool from Hole (X) .Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A - Locking Pin
8 mm (0.31 inch) Ø by
85 mm (3.35 inch) 1
Illustration 2 g02017213
Typical example
If necessary, follow Step 1.a through Step 1.c in order to position the tensioner correctly.
Install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction.
Insert Tooling (A) into Hole (Y) .
Release the pressure on the 1/2" square drive tool and remove the 1/2" square drive tool from Hole (X) .
Ensure that the belt tensioner, pulleys, and all guide rollers are clean. Ensure that the pulleys and guide rollers are free from dirt and build up from the old belt.
Ensure that all components of the belt tensioner, pulleys, and guide rollers are clean and free from wear and damage. If necessary, replace any components that are worn or damaged.Refer to Disassembly and Assembly, "Belt Tensioner" for the correct procedure.Refer to Disassembly and Assembly, "Idler Pulley" for the correct procedure.
Position alternator belt (1). Ensure that the alternator belt is centered on all pulleys. A used alternator belt should be installed in the original direction of rotation.Note: The ribs on the alternator belt must be located into the grooves of all pulleys.
Install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction. Remove Tooling (A) from Hole (Y) .
Release the pressure on the 1/2" square drive tool until the alternator belt is tensioned. Remove the 1/2" square drive tool from Hole (X) .Note: The tensioner should be at the nominal position.
If the engine has guards, install the guards. Refer to the OEM for the correct procedure.
Table 1
Required Tools
Tool Part Number Part Description Qty
A - Locking Pin
8 mm (0.31 inch) Ø by
85 mm (3.35 inch) 1
If the engine has guards, remove the guards. Refer to the Original Equipment Manufacture (OEM) for the correct procedure.Note: Mark the direction of rotation of the alternator belt if the belt will be reused.
Illustration 1 g02017213
Typical example
Install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction.
Insert Tooling (A) into Hole (Y).
Remove alternator belt (1) .
If necessary, install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction and remove Tooling (A) from Hole (Y) .
Release the pressure on the 1/2" square drive tool and remove the 1/2" square drive tool from Hole (X) .Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A - Locking Pin
8 mm (0.31 inch) Ø by
85 mm (3.35 inch) 1
Illustration 2 g02017213
Typical example
If necessary, follow Step 1.a through Step 1.c in order to position the tensioner correctly.
Install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction.
Insert Tooling (A) into Hole (Y) .
Release the pressure on the 1/2" square drive tool and remove the 1/2" square drive tool from Hole (X) .
Ensure that the belt tensioner, pulleys, and all guide rollers are clean. Ensure that the pulleys and guide rollers are free from dirt and build up from the old belt.
Ensure that all components of the belt tensioner, pulleys, and guide rollers are clean and free from wear and damage. If necessary, replace any components that are worn or damaged.Refer to Disassembly and Assembly, "Belt Tensioner" for the correct procedure.Refer to Disassembly and Assembly, "Idler Pulley" for the correct procedure.
Position alternator belt (1). Ensure that the alternator belt is centered on all pulleys. A used alternator belt should be installed in the original direction of rotation.Note: The ribs on the alternator belt must be located into the grooves of all pulleys.
Install a 1/2" square drive tool into Hole (X) in tensioner (2). From the front of the engine, turn the tool in a clockwise direction. Remove Tooling (A) from Hole (Y) .
Release the pressure on the 1/2" square drive tool until the alternator belt is tensioned. Remove the 1/2" square drive tool from Hole (X) .Note: The tensioner should be at the nominal position.
If the engine has guards, install the guards. Refer to the OEM for the correct procedure.
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