Loader Bobcat 853, 853H. Manual - part 56

FAN GEARBOX/BLOWER HOUSING

Removal And Installation

Raise the operator cab. (See Page 1–1.)

Remove the mounting bolts (Item 1) [A] from the gas
cylinder mounting bracket.

Installation: Tighten the mounting bolts to 80–90 in.–lbs.
(9–10 Nm) torque.

Remove the hydraulic fluid reservoir. (See Page 2–1.)

Disconnect the wiring harness connectors (Item 1) [B].

Remove the harness clamp (Item 2) [B].

Disconnect the breather hose from the fan drive housing.

Move the electrical harness down for clearance at the
blower housing.

Remove the clamp and belt shield (Item 1) [C] for the fan
drive.

Remove the fan drive belt.

Installation:  When checking the fan gearbox oil level,
make sure the level does not go above the top of the shaft
in the gearbox [C]. Use 90W gear lube oil if the level is low.

Use a putty knife to remove the sealant from the blower
housing and loader frame [D].

Never work on a machine with the lift arms up
unless the lift arms are secured by an approved
lift arm support device. Failure to use an
approved lift arm support device can allow the
lift arms or attachment to fall and cause injury
or death.

W–2059–0598

A

CD–15015

1

C

P–04863

1

Oil Level

D

P–04862

853, 853H Loader

–7–13–

Service Manual

B

P–04860

1

2

FAN GEARBOX/BLOWER HOUSING (Cont’d)

Removal And Installation (Cont’d)

Installation:  Use R.T.V. sealant to reseal the blower
housing to the loader frame [A].

Remove the four mounting bolts (Item 1) [B] and spacer
tubes (two outside housing and two inside housing).

NOTE: Remove the two rear mounting bolts first.

Installation: Use sealant on each end of the inside
spacer tubes to prevent the tubes from falling out of the
housing during installation.

Installation: Tighten the mounting bolts to 25–28 ft.–lbs.
(34–38 Nm) torque.

Slide the blower housing forward and remove the fan/fan
gearbox assembly [C].

Remove the blower housing.

The blower housing must be moved away from the loader
frame if the side grills have to be replaced.

To replace the side grill, remove the four mounting screws
(Item 1) [D] from the blower housing.

Install the new grill and replace the screws.

A

P–4877

C

P–4864

D

P–4876

1

1

–7–14–

853, 853H Loader

Service Manual

B

P–4859

1

1

FAN GEARBOX/BLOWER HOUSING (Cont’d)

Removal And Installation (Cont’d)

Remove the lock nut and spacer [A].

Installation: Tighten the nut to 45–55 ft.–lbs. (61–75 Nm)
torque.

Use the following procedure to remove the fan from the
shaft:

AVOID INJURY OR DEATH

Wear safety goggles to prevent eye injury

when drilling or grinding.

W–2108–1186

Install the nut (Item 1) [B] on the tapered shaft to protect
the shaft and threads.

Install the puller on the fan as shown [B].

As the center bolt (Item 2) [B] is tightened, periodically
strike the bolt head to loosen the fan from the shaft .

Remove the fan from the tapered shaft [C].

To remove the blower housing mounting plate, remove
the six bolts (Item 1) [D].

A

CD–09952

C

CD–09953

D

CD–09954

1

1

1

853, 853H Loader

–7–15–

Service Manual

B

P–03006

2

1

FAN GEARBOX/BLOWER HOUSING (Cont’d)

Removal And Installation (Cont’d)

Early S/N Loaders:

Use the following procedure to remove the fan from the
shaft:

Use a center punch to mark the aluminum bushing in the
fan as shown in [A].

To insure straight drilling and tapping of the holes, a drill
press is recommended.

Drill the two holes (Item 1) [B] 1.0 inch (25,4 mm) deep
using a 13/64 inch drill bit.

Use a 1/4 inch NC bottom tap to cut maximum threads in
the holes.

Drive
Shaft

A

0.562–0.570 “

(14,3–14,5 mm)

–7–16–

853, 853H Loader

Service Manual

B

P–03007

1

1