Loader Bobcat 853, 853H. Instruction - page 59

FAN GEARBOX (Cont’d)

Assembly (Cont’d)

After the gear is seated, drive the key down inside the
gear key way [A].

NOTE: This will prevent damage to the shims when

the bearing is installed later.

Install the shaft in the housing, tapered end in the bearing
at the round flange end of the housing [B].

Install on the shaft, the same number and size shims that
were removed during disassembly [C].

Install a bearing on the gear end of the shaft [D].

A

P–02975

C

P–02977

D

P–02974

853, 853H Loader

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B

P–02976

FAN GEARBOX (Cont’d)

Assembly (Cont’d)

Install the snap ring in the groove above the bearing [A].

Install the washer (Item 1) [B] on the shaft. Put liquid
adhesive (LOCTITE #242) on the screw threads and
install the screw [B].

A

P–02973

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853, 853H Loader

Service Manual

853, 853H Service Manual #6720755 – Engine Service Section Part 1 of 4

B

P–02978

1

FAN GEARBOX (Cont’d)

Checking Backlash

NOTE: If square shims are used, put a small amount

of the liquid adhesive on both sides of all
shims.

Install the four mounting bolts through the flange holes
[C].

Install the part number tag [C].

Install and tighten the nut to 25–28 ft.–lbs. (34–38 Nm)
torque.

Install the long key (Item 1) [D] and the pulley (Item 2) [D].

Install a bolt in the set screw hole to maintain a 1.0 inch
(25,0 mm) distance from the shaft center to the bolt head
(to be used with a dial indicator) [D].

The backlash tolerance between the gears should be
0.005–0.008 inch (0,127–0,203 mm).

To check the gear backlash use the following procedure:

Put the short housing in a vise, square flange facing up
as shown [A].

Install the same size and number of square shims (if
present during disassembly) between the two housings
[B].

Set the long housing on the short housing with a small
amount of liquid adhesive (LOCTITE #242) between the
mounting surfaces.

NOTE: For procedures requiring the use of LOCTITE

adhesive, thoroughly clean and dry affected
parts before the application of LOCTITE.

A

P–02987

C

P–02983

Part Number

Tag

D

P–02984

2

1

1.0”

(25,0 mm)

853, 853H Loader

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B

P–02981

FAN GEARBOX (Cont’d)

Checking Backlash (Cont’d)

Put the fan nut (Item 1) [A] on the shaft and tighten snugly.

Install a locking pliers on the fan nut and support the
handle against the long housing [A].

Using a magnetic based dial indicator mounted on a
bench vise, touch the dial stem on the bolt (Item 1) [B].

Hold the locking pliers against the long housing and rotate
the pulley back and forth to read the dial gauge [B].

If the backlash is GREATER than 0.008 inch (0,203 mm),
do the following:

1. Remove a square shim(s) (if present) between the

two housings.

2. Remove a large shim(s) from the tapered end of the

short shaft and add a small shim(s) of the same
thickness between the bearing and the gear on the
screw end of the shaft.

If the backlash is LESS than 0.005 inch (0,127 mm) do the
following:

1. Add a square shim(s) between the two housings.

2. Remove a small shim(s) between the bearing and

the gear on the screw end of the short shaft and add
a large shim(s) of the same thickness between the
snap ring and the bearing on the tapered end of the
shaft.

A

P–02982

1

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853, 853H Loader

Service Manual

B

P–02979

1

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