Loader Bobcat 773. Manual - part 97

CRANKSHAFT AND BEARINGS

Removal And Installation

Remove the piston and connecting rod assemblies. (See
Page 7–63.)

Remove the engine flywheel. (See Page 7–35.)

Remove the bolts which fasten the bearing case cover to
the block.

Installation:  Tighten the bearing case cover bolts to
13–15 ft.–lbs. (18–21 Nm) torque.

Install two bolts into the bearing case cover and pull the
cover out [A].

Installation: When installing the cover (Item 1) [B], make
sure the casting mark (Item 2) [B] is in the down position.

Before removing the crankshaft/main bearings, check the
end play. Install a dial indicator. Measure the end play by
moving the crankshaft back and forth [C].

If the measurement exceeds the allowable limit, replace
the thrust washers.

End Play

0.006–0.012 inch (0,15–0,31 mm)

. . . . . . . . . . 

Allowable Limit

0.020 inch (0,5 mm)

. . . . . . . . . . . . . . . . . 

Remove the main bearing case bolt (Item 1) [D].

Installation:  Make alignment of the bearing case hole
(Item 2) [D] with the hole in the block. Put oil on the bolt
threads and tighten to 51–54 ft.–lbs. (69–73 Nm) torque.

A

B–03648

C

B–09565

D

B–14346

2

1

773 BICS Loader

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Service Manual

B

B–14345

2

1

CRANKSHAFT AND BEARINGS (Cont’d)

Removal And Installation (Cont’d)

Remove the crankshaft/main bearing assembly from the
engine block [A].

Mark the bearing case halves for correct installation.

Remove the two bearing case bolts [B].

Remove the bearing case and bearing.

Installation:  Tighten the bearing case bolts to 34–38
ft.–lbs. (46–52 Nm) torque.

Installation:  When installing the main bearing case
assemblies, face the mark FLYWHEEL to the flywheel
side of the engine block [C]. Be sure the thrust washers
with its oil grooves face outward.

Servicing The Crankshaft And Bearings

Put the crankshaft on V–blocks. Install a dial indicator on
the center journal [D].

Turn the crankshaft at a slow rate.

If the misalignment exceeds the allowable limit, replace
the crankshaft.

Alignment

0.003 inch (0,08 mm)

. . . . . . . . . . . . . . . . . . . . 

A

PI–10020

C

PI–10021

D

A–02763

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773 BICS Loader

Service Manual

B

B–04092

CRANKSHAFT AND BEARINGS (Cont’d)

Servicing The Crankshaft And Bearings (Cont’d)

Tighten the connecting rod cap bolts as follows:

W/O Flange Bolt

27–30 ft.–lbs. (37–41 Nm)

. . . . . . . . . 

W/Flange Bolt

33–36 ft.–lbs. (45–49 Nm)

. . . . . . . . . . . 

Measure the crankpin O.D. [B].

Calculate the oil clearance.

Crankpin Bearing I.D.

1.850–1.852 inches

. . . . . . . . . . . 

(47,0–47,05 mm)

Crankpin O.D.

1.849–1.850 inches (46,96–46,98 mm)

Oil Clearance

0.0009–0.003 inch (0,025–0,087 mm)

. . 

Check the wear on the crankshaft sleeve [C].

If the wear exceeds the allowable limit or the seal leaks
oil, replace the sleeve.

Wear of Sleeve

0.004 inch (0,1 mm)

. . . . . . . . . . . . . . . . 

The special tool set (Kubota Code Number:
07916–32091) will be needed to replace the crankshaft
sleeve.

Remove the sleeve.

Install the sleeve guide (Item 1) [D] and stop (Item 2) [D].

Heat the sleeve to about 300

°

F (150

°

C). Install the sleeve

on the crankshaft using the special driver tool (Item 3) [D].

A

A–02727

120

C

PI–10022

D

PI–10023

2

1

2

3

773 BICS Loader

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Service Manual

B

A–02716

CRANKSHAFT AND BEARINGS (Cont’d)

Servicing The Crankshaft And Bearings (Cont’d)

Measure the I.D. of the No. 1 crankshaft bearing [A].

Measure the O.D. of the crankshaft journal [B].

Calculate the oil clearance.

If the clearance exceeds the allowable limit, replace the
crankshaft bearing.

Bearing I.D.

2.046–2.049 inches (51,98–52,04 mm)

. . 

Journal O.D.

2.044–2.045 inches (51,92–51,94 mm)

. . 

Oil Clearance

0.002–0.005 inch (0,04–0,12 mm)

. . . . . . 

Allowable Limit

0.008 inch (0,2 mm)

. . . . . . . . . . . . . . . . . 

To remove the front bearing make the driver tool as shown
in figure [C].

To install the front bearing make the driver tool as shown
in figure [D].

A

B–03631

C

MC–01367

REMOVAL TOOL

5.31’’ (135 mm)

0.4’’

(10 mm)

1.57’’ R

(40 mm)

0.8’’ (20 mm)

2.83’’

(72 mm)

0.8’’

(20 mm)

2.0413–2.0433’’

(51,85–51,90 mm)

2.2382–2.2402’’

(56,85–56,90 mm)

D

MC–01365

5.12’’ (130 mm)

2.83’’

(72 mm)

0.8’’

(20 mm)

0.4’’

(10 mm)

1.57’’ R

(40 mm)

0.8’’ (20 mm)

2.0412–2.0433’’

(51,85–51,90 mm)

2.2382–2.2402’’

(56,85–56,90 mm)

0.35’’

(9 mm)

INSTALLATION

TOOL

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773 BICS Loader

Service Manual

B

B–03618