Loader Bobcat 853, 853H. Service Manual - part 31

SPRING LOADED TENSIONER PULLEY (Cont’d)

Assembly

Install the spring (Item 1) [A] on the pulley (Item 2) [A] as
shown.

Install the shaft from the bracket assembly (Item 1) [B]
into the pulley assembly (Item 2) [B] and align the spring
(Item 3) [B] over the alignment pin on the bracket.

Turn the pulley assembly over and install the two pins
(Item 1) [C] into the hub.

Install a punch as shown and turn clockwise while
applying down pressure on the pulley.

Turn until the pulley snaps down into place; this procedure
winds the spring and retains the end of the spring in
proper location [D].

A

P–08871

2

1

C

P–08873

1

D

P–08874

–3–30–

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Service Manual

B

P–08872

1

2

3

SPRING LOADED DRIVE BELT TENSIONER PULLEY
(Cont’d)

Assembly (Cont’d)

Install the first retainer washer (Item 1) [A] and spring
washer (Item 2) [A] over the roll pins.

Install the second retainer washer (Item 1) [B], the
washer (Item 2) [B] and the bolt (Item 3) [B]. Tighten the
bolt to 28–32 ft.–lbs. (38–45 Nm) torque.

Fill the grease cap 1/4 full (approximately 1/2–3/4 oz.) of
grease.

Press the grease cap (Item 1) [C] onto the pulley
assembly (Item 2) [C]. Press on the outer formed edge of
the grease cap.

NOTE: When pressing the grease cap onto the

pulley assembly, do not press down on the
arrow indicator plate. Support the hub
assembly so that it contacts only the hub and
not the arrow indicator plate.

A

P–08875

2

1

C

P–08877

1

2

853, 853H Loader

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B

P–08876

2

3

1

SPRING LOADED TENSIONER PULLEY (Cont’d)

Adjusting The Drive Belt

When adjusted correctly the spring loaded idler assembly
will increase the service life of the drive belt.

To adjust the spring loaded tensioner pulley, use the
following procedure:

Loosen the mounting bolt (Item 1) [A] on the idler bracket.
The pointer (Item 1) [B] will be at the seven o’clock
position when the belt tensioner is not under spring
pressure.

Pull the idler pulley against the drive belt, with the
adjusting nut (Item 2) [A], until the pointer is at the nine
o’clock position (Item 2) [B], lower the idler assembly a
small amount so that the idler is operating on spring
tension.

Tighten the mounting bolt (Item 1) [A] to 25–28 ft.–lbs.
(34–38 Nm) torque.

Run the engine for a few minutes. Stop the engine and
check the pointer position.

Adjust the idler assembly as needed.

After the spring loaded tensioner pulley has been in
service, readjust when the pointer reaches the seven
o’clock position.

B

P–07019

1

2

–3–32–

853, 853H Loader

Service Manual

A

C–03519

2

1

FIXED TENSIONER PULLEY

Removal And Installation

Remove the three belt shield holddown clips (Item 1) [A].

Remove the belt shield.

Loosen the tensioner pulley mounting bolt (Item 1) [B].

Loosen the jam nut and lock nut (Item 2) [B].

Remove the drive belt.

Installation:  Tighten the drive belt to the correct
specifications. (See Page 3–41.)

Remove the jam nut and lock nut (Item 1) [C].

Remove the mounting bolt (Item 2) [C].

Remove the tensioner pulley assembly.

A

P–04924

1

1

1

C

P–04929

1

2

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B

P–04926

1

2