268B Caterpillar Skid Steer Loader Service Repair Manual

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines Media

Bearing Clearance - Check

SMCS - 1203-535; 1219-535

Measurement Procedure Table 1

Required Tools

Plastic Gauge (Green)

to

Plastic Gauge (Red)

to 0.152 mm (0.002 to 0.006 inch)

Plastic Gauge (Blue) 0.102 to 0.229 mm (0.004 to 0.009 inch)

Plastic Gauge (Yellow) 0.230 to 0.510 mm (0.009 to 0.020 inch)

Note: Plastic gauge may not be necessary when the engine is in the chassis.

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

i05977048

Note: Cat does not recommend the checking of the actual bearing clearances particularly on small engines. This is because of the possibility of obtaining inaccurate results and the possibility of damaging the bearing or the journal surfaces. Each Cat engine bearing is quality checked for specific wall thickness.

Note: The measurements should be within specifications and the correct bearings should be used. If the crankshaft journals and the bores for the block and the rods were measured during disassembly, no further checks are necessary. However, if the technician still wants to measure the bearing clearances, Tooling (A) is an acceptable method. Tooling (A) is less accurate on journals with small diameters if clearances are less than 0.10 mm (0.004 inch).

NOTICE

Lead wire, shim stock or a dial bore gauge can damage the bearing surfaces.

The technician must be very careful to use Tooling (A) correctly. The following points must be remembered:

• Ensure that the backs of the bearings and the bores are clean and dry.

• Ensure that the bearing locking tabs are properly seated in the tab grooves.

• The crankshaft must be free of oil at the contact points of Tooling (A).

1. Put a piece of Tooling (A) on the crown of the bearing that is in the cap.

Note: Do not allow Tooling (A) to extend over the edge of the bearing.

2. Use the correct torque-turn specifications in order to install the bearing cap. Do not use an impact wrench. Be careful not to dislodge the bearing when the cap is installed.

Note: Do not turn the crankshaft when Tooling (A) is installed.

3. Carefully remove the cap, but do not remove Tooling (A). Measure the width of Tooling (A) while Tooling (A) is in the bearing cap or on the crankshaft journal. Refer to Illustration 1.

Illustration 1 g01152855

Typical Example

4. Remove all of Tooling (A) before you install the bearing cap.

Note: When Tooling (A) is used, the readings can sometimes be unclear. For example, all parts of Tooling (A) are not the same width. Measure the major width in order to ensure that the parts are within the specification range. Refer to Specifications Manual, "Connecting Rod Bearing Journal" and Specifications Manual, "Main Bearing Journal" for the correct clearances. Copyright 1993 - 2019 Caterpillar Inc. All Rights Reserved.

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number -RENR7582-07 Publication Date -01/01/2010 Date Updated -26/02/2010

Camshaft - Remove and Install

SMCS - 1210-010

Removal Procedure

Start By:

A. Remove the rocker shaft and pushrods. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Remove".

B. Remove the front housing. Refer to Disassembly and Assembly, "Housing (Front)Remove".

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. Turn the engine upside-down so the valve lifters are held in a position away from the camshaft.

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1

2. Remove bolts (1) .

Illustration 2

NOTICE

Do not damage the lobes or the bearings when the camshaft is removed or installed.

3. Carefully remove camshaft (2) .

Installation Procedure

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. Ensure that the camshaft is clean. Lubricate the camshaft with clean engine oil prior to installation.

Illustration 3

NOTICE

Do not damage the lobes or the bearings when the camshaft is removed or installed.

2. Carefully install camshaft (2) .

Illustration 4

3. Install bolts (1). Tighten bolts (1) to a torque of 10 to 13 N·m (7 to 10 lb ft).

End By:

a. Install the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Install".

b. Install the rocker shaft and pushrods. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Install". Copyright 1993 - 2019 Caterpillar Inc.

Network For SIS Licensees. Fri Dec 20 09:36:13 UTC+0530 2019

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

i03702890

Camshaft Gear - Remove and Install

SMCS - 1210-010-GE

Removal Procedure Table 1

Required Tools

Start By:

A. Remove the camshaft. Refer to Disassembly and Assembly, "Camshaft - Remove and Install".

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

Illustration 1 g01993021

1. Use Tooling (A) to remove camshaft gear (4) from camshaft (2) . Remove key (1) and thrust plate (3) .

Note: Do not lose the key from the camshaft gear.

Installation Procedure NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. Inspect the camshaft gear, the key, and the thrust plate for wear or damage.

Illustration 2 g01993021

2. Install key (1) and thrust plate (3) . Raise the temperature of camshaft gear (4) and install camshaft gear (4) on camshaft (2) .

Note: Ensure that the key is installed on the camshaft. When you install the camshaft gear, ensure that the marked teeth are facing toward the front. If necessary, tap the gear with a soft hammer in order to seat the key in the keyway.

End By: Install the camshaft. Refer to Disassembly and Assembly, "Camshaft - Remove and Install".

1993 - 2019 Caterpillar Inc.

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number -RENR7582-07 Publication Date -01/01/2010 Date Updated -26/02/2010

Connecting Rod Bearings - Install

SMCS - 1219-012

Installation Procedure NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

i01996564

1. Install upper connecting rod bearing (3) in connecting rod (1). The upper connecting rod bearing must be centered in the connecting rod. Lubricate the bearing face with clean engine oil.

2. Pull connecting rod (1) into position against the crankshaft.

3. Install lower connecting rod bearing (5) in connecting rod cap (4). The lower connecting rod bearing must be centered in the connecting rod cap. Lubricate the bearing face with clean engine oil.

Note: Do not mix the connecting rod caps and the connecting rods.

4. Install connecting rod cap (4) .

Note: The connecting rod and the connecting rod cap should have matching Numbers (X) on the side. Ensure that the marks are on the same side.

5. Install nuts (6) on connecting rod bolts (2). Tighten the nuts evenly to a torque of 49 to 59 N·m (36 to 44 lb ft).

6. Repeat Steps 1 through 5 for the remaining connecting rod bearings.

7. Rotate the crankshaft in order to ensure that there is no binding.

End By: Install the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil PanRemove and Install".

1993 - 2019 Caterpillar Inc.

Dec 20 09:38:55 UTC+0530 2019

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number -RENR7582-07 Publication Date -01/01/2010 Date Updated -26/02/2010

Connecting Rod Bearings - Remove

SMCS - 1219-011

Removal Procedure

Start By:

A. Remove the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan - Remove and Install".

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. In order to remove the connecting rod caps, rotate the crankshaft in a clockwise direction until the piston is at the bottom center position.

Illustration 1 g01001625

2. Inspect connecting rod (1) and connecting rod cap (4) for the proper identification mark. Note: The connecting rod and the connecting rod cap should have matching Numbers (X) on the side. Mark the connecting rod and the connecting rod cap, if necessary.

3. Remove nuts (6) from connecting rod bolts (2). Remove connecting rod cap (4). Remove lower connecting rod bearing (5) from connecting rod cap (4) .

4. Carefully push connecting rod (1) into the cylinder bore. Remove upper connecting rod bearing (3) from connecting rod (1) .

5. Repeat Steps 1 through 4 for the remaining connecting rod bearings.

1993 - 2019 Caterpillar Inc.

Fri Dec 20 09:38:37 UTC+0530 2019

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number -RENR7582-07 Publication Date -01/01/2010 Date Updated -26/02/2010

Crankcase Breather - Remove and Install

SMCS - 1317-010

Removal Procedure NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

i02001086

Installation Procedure NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

Illustration 2

g01035452

1. Position crankcase breather (2) and install bolts (1). Connect hose (4) and tighten clamp (3) .

1993 - 2019 Caterpillar Inc.

Network For SIS

Fri Dec 20 09:33:24 UTC+0530 2019

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number -RENR7582-07 Publication Date -01/01/2010 Date Updated -26/02/2010

Crankshaft - Install

SMCS - 1202-012

Installation Procedure Table 1

Required Tools

A 8T-5096 Dial Indicator Gp 1

B 8T-9022 Silicone Gasket -

C 198-9113 Seal Installer 1

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. Ensure that all of the lubrication passages are clean and free of debris.

Illustration 1 g01358194

2. Install upper main bearings (6). The bearing tabs for the upper main bearings must be located in the correct position in the cylinder block. Lubricate upper main bearings (6) with clean engine oil.

3. Lubricate the upper half of the thrust washer. Place the upper half of the thrust washer on the rear of the cylinder block with the oil grooves toward the outside.

Illustration 2 g01033376

4. Ensure that the main bearing journals and the connecting rod bearing journals of the crankshaft are clean. Attach a suitable lifting device in order to position crankshaft (5) in the cylinder block. The weight of the crankshaft is approximately 32 kg (70 lb).

Note: Be careful not to damage the finished surfaces on the crankshaft.

5. Lubricate the lower half of the thrust washers. Place the lower half of the thrust washers on both sides of the rear main bearing cap. The grooves on the thrust washers must be positioned toward the crankshaft.

6. Clean the lower main bearings. Install lower main bearings (7) in main bearing caps (2) with the bearing tabs in the correct position. Lubricate the lower main bearing caps with clean engine oil.

7. Ensure that locating dowels (8) for main bearing caps (2) are in the correct position in the main bearing caps or in the cylinder block.

8. Install main bearing caps (2) in the position that was marked during the removal process. All of the bearing tabs for the main bearings should be on the same side. Install main bearing cap bolts (1) and tighten finger tight.

Note: Do not install the rear main bearing cap yet.

Illustration 4 g01033393

9. Apply Tooling (B) to the corners of the rear main bearing cap. Install the rear main bearing cap to the cylinder block so that the rear face is even with the rear face of the cylinder block.

Illustration 5 g01033394

10. Apply soapy water to side seals (9). Position side seals (9) in the grooves on the rear main bearing cap with the rounded edges of the seals toward the outside. Use Tooling (C) to push the seal into position in order to reduce the risk of damaging the seal's metal core. Apply Tooling (B) around side seals (9) .

11. Install the bolts for the rear main bearing cap. Tighten all of the bolts for the main bearing caps to a torque of 98 to 108 N·m (72 to 80 lb ft).

12. Ensure that the upper connecting rod bearings are centered in the connecting rod. Ensure that the lower connecting rod bearings are centered in the connecting rod cap. Lubricate the bearing faces with clean engine oil.

Note: Remove the tape or rubber tubing on the connecting rod bolts.

Note: Ensure that the mark on the connecting rod cap matches the mark on the connecting rod. Ensure that the marks are on the same side.

13. Install connecting rod caps (4). Install nuts (3) and tighten to a torque of 49 to 59 N·m (36 to 44 lb ft).

14. Rotate the crankshaft in order to ensure that the crankshaft turns freely.

15. Check the crankshaft end play. Use a prybar to move the crankshaft toward the front of the engine. Use Tooling (A) to measure the end play. The maximum permissible crankshaft end play is 0.300 mm (0.0118 inch).

End By:

a. Install the flywheel housing. Refer to Disassembly and Assembly, "Flywheel HousngRemove and Install".

b. Install the front housing. Refer to Disassembly and Assembly, "Housng (Front) - Install".

c. Install the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan - Remove and Install".

Dec 20 09:40:08 UTC+0530 2019

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number -RENR7582-07 Publication Date -01/01/2010

Crankshaft - Remove

SMCS - 1202-011

Removal Procedure

Start By:

A. Remove the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan - Remove and Install".

B. Remove the front housing. Refer to Disassembly and Assembly, "Housing (Front)Remove".

C. Remove the flywheel housing. Refer to Disassembly and Assembly, "Flywheel HousingRemove and Install".

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. Rotate the crankshaft.

Illustration 1

Note: Make sure that the main bearing caps and the connecting rod caps are marked for the location and direction for installation.

2. Remove main bearing cap bolts (1) .

3. Remove main bearing caps (2) from the cylinder block. Remove the bearings from the main bearing caps. Remove the lower thrust washers from the rear main bearing cap. Keep the main bearings with the respective main bearing cap.

4. Remove nuts (3) from the connecting rod bolts.

5. Remove connecting rod caps (4) from the connecting rods. Remove the bearings from the connecting rod caps. Keep the connecting rod bearings with the respective connecting rod cap.

NOTICE

Do not allow the connecting rods to strike the piston cooling jets. Damage or misalignment may occur.

Note: Use tape or rubber tubing on the connecting rod bolts to protect the crankshaft journals from damage.

6. Push the piston assemblies into the cylinder bores.

7. Attach a suitable lifting device to the crankshaft. Lift the crankshaft out of the cylinder block. The weight of crankshaft (5) is approximately 32 kg (70 lb).

Note: Be careful not to damage the finished surfaces on the crankshaft.

Illustration 2 g01358194

8. Remove upper main bearings (6). If necessary, remove the upper thrust washer from the rear of the cylinder block. Keep the upper main bearings with the respective main bearing caps.

Copyright 1993 - 2019 Caterpillar Inc. All Rights Reserved. Private Network For SIS Licensees.

Fri Dec 20 09:39:48 UTC+0530 2019

This is the sample of the manual

Click on the download link for complete Manual

Product: SKID STEER LOADER

Model: 268B SKID STEER LOADER LBA

Configuration: 248B 268B SKID STEER LOADER LBA00001-UP (MACHINE) POWERED BY 3044C Engine

Disassembly and Assembly

3044C Industrial Engine and Engines for Caterpillar Built Machines

Media Number

i01998728

Crankshaft Front Seal - Install

SMCS - 1160-012

Installation Procedure Table 1

Required Tools

NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

1. Clean the housing for the crankshaft front seal and inspect the housing for damage.