Loader Bobcat 773. Manual - part 94

TIMING GEARCASE COVER (Cont’d)

Removal And Installation (Cont’d)

Remove the crankshaft pulley (Item 1) [A] and key (Item
2) [A].

Remove the bolts from the timing gearcase cover.

Installation: Tighten the bolts to 13–15 ft.–lbs. (18–20
Nm) torque.

Remove the timing gearcase cover [B].

Remove the crankshaft oil slinger (Item 1) [C], O–ring
(Item 2) [C] and collar (Item 3) [C].

Installation:  Install new O–rings and oil seal into the
timing gearcase cover [D].

NOTE: When a new timing gearcase cover is

installed, to establish the correct position of
the injection pump fuel rack stop before
removing it from the old timing gearcase
cover, the distance from the machined
surface of the gearcase (gasket surface) to
the end of the stop should be measured. The
stop should then be installed in the new
gearcase and set to the same distance that
was previously measured. Do not try to test
operate the engine to establish if it has
enough power. The adjustment must be set
by a qualified service personnel for the
injection pump.

A

B–14339

2

1

C

B–14340

1

2

3

D

B–03617

O–rings

Oil Seal

773 BICS Loader

–7–55–

Service Manual

B

B–04095

IDLER GEAR AND CAMSHAFT

Removal And Installation

Remove the timing gearcase cover. (See Page 7–54.)

Remove the snap ring (Item 3) [A] from the idler gear
shaft (Item 1) [A].

Installation: Make sure the timing marks are in correct
alignment when installing the timing gears [A].

Remove the idler gear (Item 1) [B].

Remove the idler gear collar (Item 2) [B].

Remove the idler gear shaft mounting bolts.

Installation: Tighten the mounting bolts to 17–20 ft.–lbs.
(23–27 Nm) torque.

Align the holes on the camshaft gear with the camshaft
retainer plate bolts.

Remove the bolts.

Installation: Tighten the camshaft retainer bolts to
17–20 ft.–lbs. (23–27 Nm) torque.

Remove the camshaft from the engine block [C].

Installation:  Check the camshaft end play, if the
clearance exceeds the allowable limit, replace the
camshaft retainer plate [D].

Camshaft End Play

0.003–0.009 inch (0,07–0,22 mm)

. 

Allowable Limit

0.012 inch (0,3 mm)

. . . . . . . . . . . . . . . . . 

A

B–14341

(1) Idle Gear
(2) Idle Collar
(3) External Snap Ring
(4) Cam Gear
(5) Camshaft

5

1

2

3

4

C

B–03655

D

PI–10002

0.003–0.009’’

(0,07–0,22 mm)

–7–56–

773 BICS Loader

Service Manual

B

B–03699

2

1

IDLER GEAR AND CAMSHAFT (Cont’d)

Servicing The Camshaft

Measure the camshaft bearing in the engine block [A].

Measure the camshaft journal [B].

Calculate the oil clearance. If the clearance exceeds the
allowable limit, replace the camshaft.

Bearing I.D.

1.575–1.576 inches (40,0–40,03 mm)

. . . 

Journal O.D.

1.572–1.573 inches (39,93–39,95 mm)

. . 

Oil Clearance of Camshaft
  Journal

0.002–0.004 inch (0,05–0,09 mm)

. . . . . . . . . . 

Allowable Limit

0.006 inch (0,15 mm)

. . . . . . . . . . . . . . . . 

Measure the cam lobes at their highest point [C].

If the measurement is less than the allowable limit,
replace the camshaft.

Cam Lobe Height

1.318 inches (33,47 mm)

. . . . . . . . . . 

Allowable Limit

1.316 inches (33,42 mm)

. . . . . . . . . . . . 

Put the camshaft in V–blocks. Install a dial indicator [D].

Turn the camshaft at a slow rate. If the misalignment
exceeds the allowable limit, replace the camshaft.

Camshaft Alignment
  Allowable Limit

0.003 inch (0,08 mm)

. . . . . . . . . . . . . . . 

A

B–03620

C

B–05001

D

A–02760

773 BICS Loader

–7–57–

Service Manual

B

A–02761

IDLER GEAR AND CAMSHAFT (Cont’d)

Servicing The Idler Gear And Shaft

Measure the O.D. of the idler gear shaft [A].

Measure the I.D. of the idler gear busing [A].

If the clearance exceeds the allowable limit, replace the
bushing.

Idler Gear Shaft O.D.

1.258–1.259 inches

. . . . . . . . . . . 

(31,96–31,97 mm)

Idler Gear Bushing I.D.

1.259–1.261 inches

. . . . . . . . . . 

(32,0–32,03 mm)

Clearance Between Idler Shaft &
  Gear Bushing

0.001–0.003 inch (0,025–0,07 mm)

. . . 

Allowable Limit

0.004 inch (0,1 mm)

. . . . . . . . . . . . . . . . . 

To replace the idler gear bushing, make a driver tool as
shown in figure [B].

Use a press and special driver tool, to remove the old
bushing and install the new bushing [C].

A

PI–10003

C

PI–10004

–7–58–

773 BICS Loader

Service Manual

B

MC–01366

6.38’’ (162 mm)

1.575’’

(40 mm)

1.378’’ (35 mm)

1.258–1.259’’

(31,96–31,97 mm)

1.413–1.415’’

(35,9–35,95 mm)

1.575’’

(40 mm)