CAT Caterpillar 326 Service Repair Manual PDF Download

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Product: EXCAVATOR

Model: 326 EXCAVATOR MFJ

Configuration: 326 Excavator MFJ00001-UP (MACHINE) POWERED BY C7.1 Engine

Disassembly and Assembly

C7.1 Engines for Caterpillar Built Machines

i07585320

Accessory Drive - Remove and Install - Accessory Drive SAE "A" SMCS - 1207-010

Removal Procedure

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Dispose of all fluids according to local regulations and mandates.

Illustration 1 g02186413

Illustration 2 g02186414

1. If necessary, remove Original Equipment Manufacture (OEM) driven equipment from auxiliary drive (5). Refer to the OEM for the correct procedure.

2. If the OEM driven equipment was not installed onto auxiliary drive (5). Remove cover plate (2) and remove O-ring seal (3) (not shown).

3. Remove allen head screws (4) and allen head screw (6) from accessory drive housing (5).

4. Remove accessory drive housing (5) from the front housing.

Illustration 3 g02183295

5. Remove gasket (7) from accessory drive housing (5).

6. If necessary, follow Step 6a through Step 6d to disassemble the accessory drive.

a. Remove circlip (11) from accessory drive housing (5).

b. Place accessory drive housing (5) onto a suitable support. Press the assembly of gear (9), bearing (10) and bearing (8) out of accessory drive housing (5).

c. Use Tooling (A) to remove bearing (10) from gear (9).

d. Use Tooling (A) to remove bearing (8) from gear (9).

Installation Procedure

2

Contaminants may cause rapid wear and shortened component life.

Illustration 4 g02183296

1. If necessary, follow Step 1a through Step 1e to assemble the accessory drive.

a. Inspect the condition of the teeth and the splines of gear (9) for wear and damage. Inspect bearing (10), bearing (8), and circlip (11). Inspect accessory drive housing (5) for wear and damage. Replace any components that are worn or damaged.

b. Apply a small continuous bead of Tooling (B) to inner Surface (X) of bearing (8). Place the inner race of bearing (8) onto a suitable support. Press the shaft of gear (9) into bearing (8) until the shoulder of the gear is against the bearing. Remove any excess compound.

c. Apply a small continuous bead of Tooling (B) to inner Surface (Z) of bearing (10). Place the inner race of bearing (10) onto a suitable support. Press the shaft of gear (9) into bearing (10) until the shoulder of the gear is against the bearing. Remove any excess compound.

d. Apply a small continuous bead of Tooling (B) to the outer Surface (W) and the outer Surface (Y) of bearing (8) and bearing (10). Place accessory drive housing (5) on a suitable support. Press the assembly of gear (9) into the accessory drive housing. Ensure that bearing (10) and bearing (8) are against the front face of the recesses in accessory drive housing (5). Remove any excess compound.

e. Install circlip (11) into the groove in accessory drive housing (5). Ensure that circlip (11) is correctly positioned in the groove.

2. Inspect the bore in the front housing for damage. If necessary, replace the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Remove" and Disassembly and Assembly, "Housing (Front) - Install" for the correct procedure.

3. Position a new gasket (7) to accessory drive housing (5).

4. Lightly lubricate bearing (10), bearing (8), and gear (9) with clean engine lubricating oil. Install the assembly of the accessory drive to the front housing. Ensure that the flange on the accessory drive housing is flush with the front housing.

Illustration 5

5. Install new M8 allen head screws (4) to accessory drive housing (5).

6. Install new M12 allen head screw (6) to accessory drive housing (5).

7. Tighten M8 allen head screws to a torque of 22 N·m (195 lb in).

8. Tighten M12 allen head screw to a torque of 78 N·m (58 lb ft).

9. Repeat Step 7 to ensure correct torque of M8 allen head screws (4).

10. Ensure that there is tactile backlash between the idler gear and the accessory drive gear.

g02186414

11. If necessary, install the OEM driven equipment to auxiliary drive (5). Refer to the OEM for the correct procedure.

Illustration 6

g02186413

12. If the OEM driven equipment is not being installed to the auxiliary drive. Use Tooling (C) to lubricate a new O-ring seal (3). Install O-ring seal (3) (not shown) to cover plate (2) install the cover assembly to the auxiliary drive and install bolts (1).

Product: EXCAVATOR

Model: 326 EXCAVATOR MFJ

Configuration: 326 Excavator MFJ00001-UP (MACHINE) POWERED BY C7.1 Engine

Disassembly and Assembly

C7.1 Engines for Caterpillar Built Machines

i07585330

Accessory Drive - Remove and Install - Accessory Drive SAE "B" SMCS - 1207-010

Removal Procedure

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Dispose of all fluids according to local regulations and mandates.

1. Remove the auxiliary equipment from the accessory drive housing. Refer to the Original Equipment Manufacture (OEM) for the correct procedure.

1 g02186453

Illustration

Illustration 2 g02374996

2. If the OEM driven equipment has not been installed to the auxiliary drive, remove bolts (1). Remove cover plate (2) and remove gasket (3) (not shown).

3. Remove allen head screws (4) from accessory drive housing (5). Remove allen head screw (6) from accessory drive housing (5).

4. Remove accessory drive housing (5) from the front housing.

5. Remove gasket (7) from accessory drive housing (5).

Illustration 3 g02374997

6. If necessary, follow Step 6a through Step 6d to disassemble the accessory drive.

a. Remove circlip (11) from gear (9).

b. Remove circlip (12) from accessory drive housing (5).

c. Place accessory drive housing (5) onto a suitable support. Press the assembly of gear (9) and bearing (10) out of accessory drive housing (5). Use Tooling (A) to remove bearing (10) from gear (9).

Note: Note the position of the bearing in the accessory drive housing before removal.

d. Press bearing (8) out of accessory drive housing (5).

Installation Procedure

Table 2

Required Tools

Tool Part Number Part Description Qty

Mount Compound 1

- Rubber Grease 1

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

4 g02374997

Illustration

Illustration 5 g02052174

Illustration 6 g02052273

1. If necessary, follow Step 1a through Step 1f to assemble the accessory drive.

a. Inspect the condition of the teeth and the splines of gear (9) for wear and damage. Inspect bearing (8), bearing (10), circlip (11), and circlip (12). Inspect the front housing for wear and damage. Replace any components that are worn or damaged.

b. Apply a small continuous bead of Tooling (B) to outer Surface (X) of bearing (8). Place the accessory drive housing on a suitable support. Press the outer race of bearing (8) until the bearing is in the correct position within accessory drive housing (5). Remove any excess bearing mount compound.

c. Apply a small continuous bead of Tooling (B) to inner Surface (Y) of bearing (10). Place the inner race of bearing (10) onto a suitable support. Press the shaft of gear (9) into bearing (10) until the shoulder of the gear is against the bearing. Remove any excess bearing mount compound.

d. Install circlip (11) into the groove in gear (9).

e. Apply a small continuous bead of Tooling (B) to the outer Surface (Z) of bearing (10). Place accessory drive housing (5) on a suitable support. Ensure that the shaft of gear (9) is correctly aligned with bearing (8). Press the assembly of the gear into the accessory drive housing. Remove any excess bearing mount compound.

f. Install circlip (12) into the groove in accessory drive housing (5). Ensure that circlip (12) is correctly positioned in the groove.

2. Inspect the bore in the front housing for damage. If necessary, replace the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Remove" and Disassembly and Assembly, "Housing (Front) - Install" for the correct procedure.

3. Lightly lubricate bearing (8), bearing (10), and gear (9) with clean engine oil.

Illustration 7

4. Install new gasket (7) to accessory drive assembly (5). Install the assembly of the accessory drive to the front housing.

5. Install new M8 allen head screws (4) to accessory drive housing (5).

6. Install a new M12 allen head screw (6) to accessory drive housing (5).

7. Tighten new M8 allen head screws (4) to a torque of 22 N·m (195 lb in).

8. Tighten M12 allen head screw (6) to a torque of 78 N·m (58 lb ft).

9. Repeat Step 7 to ensure correct torque of M8 allen head screws (4).

10. Ensure that there is tactile backlash between the idler gear and the accessory drive gear.

11. Install the auxiliary equipment to the accessory drive housing. Refer to the OEM for the correct procedure.

Illustration 8

g02186453

12. If the OEM driven equipment is not being installed to the auxiliary drive. Install a new gasket (3) (not shown) and cover plate (2). Install bolts (1) and tighten the bolts to a torque of 44 N·m (33 lb ft).

Product: EXCAVATOR

Model: 326 EXCAVATOR MFJ

Configuration: 326 Excavator MFJ00001-UP (MACHINE) POWERED BY C7.1 Engine

Disassembly and Assembly

C7.1 Engines for Caterpillar Built Machines

Air Compressor - Remove and Install - Single Cylinder

SMCS - 1803-010

Removal Procedure

Table 1 Required Tools

(1) The Crankshaft Turning Tool is used on the front pulley.

(2) This Tool is used in the aperture for the electric starting motor.

Note: Either Tooling (A) can be used. Use the Tooling that is most suitable.

NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers

i07590138

before opening any compartment or disassembling any component containing fluids.

Dispose of all fluids according to local regulations and mandates.

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

Note: Put identification marks on all hoses, on all hose assemblies and on all tube assemblies for installation purposes. Plug all hose assemblies and tube assemblies. Plugging all hose assemblies and tube assemblies helps to prevent fluid loss and also helps to keep contaminants from entering the system.

Do not disconnect the air lines until the air pressure in the system is at zero. If hose is disconnected under pressure it can cause personal injury.

1. Release the pressure from the air system. Refer to the Original Equipment Manufacture (OEM) for the correct procedure.

2. Drain the coolant from the cooling system into a suitable container for storage or for disposal. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change" for the correct draining procedure.

3. If the engine is equipped with a hydraulic pump on the rear of the air compressor, remove the hydraulic pump. Refer to the OEM for the correct procedure.

4. Use Tooling (A) to rotate the crankshaft so that number one piston is at the top center position on the compression stroke. Refer to Systems Operation, Testing and Adjusting, "Finding Top Center Position for No.1 Piston" for the correct procedure.

Note: The air compressor must be timed with the engine to minimize engine vibration.

Illustration 1 g01966313

Typical example

5. Remove plug (2) from the cylinder block. Remove O-ring seal (1) from the plug.

6. Install Tooling (B) into Hole (X) in the cylinder block. Use Tooling (B) to lock the crankshaft in the correct position.

Note: Do not use excessive force to install Tooling (B). Do not use Tooling (B) to hold the crankshaft during repairs.

Illustration 2 g01964836

Typical example

Illustration 3 g01965121 Typical example

7. Slide hose clamps along coolant hose (3) and coolant hose (4). Disconnect coolant hose (3) and coolant hose (4) from air compressor (6).

8. Disconnect the air lines from port (5) (not shown) and air lines from port (7). Refer to the OEM for the correct procedure.

9. Remove banjo bolt (9) and sealing washers from air compressor (6).

10. Remove bolt (10) and bolt (12) from support bracket (11) and remove the support bracket.

11. Support air compressor (6) and remove nuts (15). Remove the air compressor from front housing (8).

12. If necessary, remove studs (14) from front housing (8).

13. If necessary, remove bolts (17) and remove plate (16). Remove O-ring seal (13) from plate (16).

Illustration 4 g01964860

Typical example

14. Remove O-ring seal (21) from air compressor (6).

15. If necessary, follow Step 15a through Step 15b to remove gear (18) from the crankshaft of the air compressor.

a. Use a suitable tool to prevent the shaft of the compressor from rotating. Remove nut (20) and remove spring washer (19).

b. Use Tooling (C) to remove gear (18) from the crankshaft of the air compressor.