Loader Bobcat 853, 853H. Manual - part 71

IDLER GEAR AND HUB

Removal

Remove the timing gearcase cover. (See Page 7–71.)

Remove the bolts at the tube for gear lubrication [A].

Remove the tube [B].

Remove the bolts at the idler gear [C].

Installation: Tighten the bolts to 10–12 ft.–lbs. (14–16
Nm) torque.

Remove the idler gear and hub [D].

Checking

Check the idler gear hub.

Standard – 1.7695–1.7707 inch (44,945–44,975 mm)
  Limit – 1.7656 inch (44,845 mm)

Check the clearance between the idler gear and hub.

Limit – 0.0079 inch (0,20 mm)

Check the end play at the gear and hub.

Standard – 0.003 inch (0,07 mm)
  Limit – 0.008 inch (0,20 mm)

A

B–08929

C

B–08926

D

B–08933

853, 853H Loader

–7–73–

Service Manual

B

B–08928

IDLER GEAR AND HUB (Cont’d)

Installation

Install the idler gear on the hub.

Make sure the timing marks are in alignment with the
crankshaft, camshaft and fuel injection pump idler gears
[A].

Check the backlash between the gears. The correct
backlash is 0.003 inch (0,076 mm).

A

B–08995

–7–74–

853, 853H Loader

Service Manual

853, 853H Service Manual #6720755 – Engine Service Section Part 3 of 4

FUEL INJECTION PUMP IDLER GEAR

Removal And Installation

Remove the timing gearcase cover. (See Page 7–71.)

Remove the idler gear. (See Page 7–73.)

Remove the bolt at the fuel injection pump idler gear [A].

Installation: Tighten the bolt to 72–87 ft.–lbs. (98–118
Nm) torque.

Remove the idler gear and bearing [B].

If the bearing needs replacement, remove the snap ring
at the bearing [C].

Use a press to remove and install the new bearing.

Bearing Installation

When installing the new bearing, make sure the
projection and height is correct [D].

Projection – 0.016–0.024 inch (0,40–0,60 mm)
Height – 0.933–0.945 inch (23,7–24,0 mm)

A

B–08930

C

B–08955

D

B–08896

Projection

853, 853H Loader

–7–75–

Service Manual

B

B–08927

CAMSHAFT GEAR

Removal And Installation

Remove the timing gearcase cover. (See Page 7–71.)

Remove the idler gear. (See Page 7–73.)

Remove the bolt at the camshaft gear [A].

Installation: Tighten the bolt to 72–87 ft.–lbs. (98–118
Nm) torque.

Install the puller and remove the gear [B].

Remove the bolts at the retainer plate [C].

Installation: Tighten the bolts to 11–17 ft.–lbs. (15–23
Nm) torque.

Remove the retainer plate [D].

Installation: Check the camshaft end play.

Standard – 0.002–0.0045 inch (0,05–0,114 mm)
  Limit – 0.0079 inch (0,20 mm)

A

B–08931

C

B–08980

D

B–08979

–7–76–

853, 853H Loader

Service Manual

B

B–08932