Loader Bobcat 853, 853H. Manual - part 42

BOB–TACH

Removal And Installation

Tilt the Bob–Tach forward, so it is parallel to the floor. Put
blocks approximately 3 inches thick under each side of
the Bob–Tach (Item 1) [A]. Lower the Bob–Tach onto the
blocks [A].

Remove the retainer bolt (Item 1) [B] from the pivot pin.

Installation:  Tighten the retainer bolt to 18–20 ft.–lbs.
(24–27 Nm) torque.

Remove the grease fitting from the pivot pin (Item 1) [C].

Remove the rod end pivot pin (Item 1) [C].

Remove the tilt cylinder rod end.

Remove the seals (Item 1) [D].

A

CD–15075

1

C

P–03915

1

D

P–03911

1

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B

P–04601

1

BOB–TACH (Cont’d)

Removal And Installation (Cont’d)

Installation:  Use two pieces of shim stock (light
cardboard) to protect the seals during installation. Install
the rod end of the tilt cylinder into the Bob–Tach [A].

Be careful not to damage the seals during installation.

NOTE: Removal procedure is shown for the right

side. Left side procedure is the same.

Remove the grease fitting (Item 1) [B] from the Bob–Tach
frame for the pivot pin (both sides) [C].

NOTE: The grease fitting must be removed to

prevent the pivot pin from being hydraulic
locked in the Bob–Tach frame.

Loosen the bolt (Item 2) [B] at the Bob–Tach pivot pin.

Installation:  Tighten the bolt to 250–260 ft.–lbs.
(339–353 Nm) torque.

Strike the head of the bolt (Item 2) [B] to push the pivot
pin into the Bob–Tach frame.

Remove the bolt (Item 2) [B].

Use a punch to push the pivot pin all the way into the
Bob–Tach frame.

Installation: A longer bolt is necessary to install through
lift arms into the pivot pin, to pull the pivot pin into the lift
arms.

Remove the Bob–Tach frame from the lift arms [C].

Remove the seal dust cup (Item 1) [C].

Remove the rubber seal [D].

NOTE: Use tapered reamer MEL1233 to clean the

tapered hole in the lift arms. The tapered hole
must be clean and free of debris to provide a
good contact surface for the pivot pin.

A

P–03910

C

P–03908

1

D

P–03909

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B

P–03913

2

1

BOB–TACH (Cont’d)

Removal And Installation (Cont’d)

Install the Bob–Tach mounting bolt (Item 1) [A] into the
pivot pin (Item 2) [A]. Remove the pivot pin from the
Bob–Tach frame.

Check for wear and damage. Replace the pivot pins as
needed.

Installation:  Push the pivot pin (Item 2) [A] into the
Bob–Tach frame. Position the end of the pin flush with the
end of the Bob–Tach bushing (Item 3) [A].

Reverse the removal procedure to install the Bob–Tach.

Bob–Tach Lever And Wedge

Use the following procedure to remove and install the
Bob–Tach lever (Item 1) [B], spring and wedge:

Remove the lever mounting bolt and nut (Item 1) [C],
washer (Item 2) [C] and spring (Item 3) [C].

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

Remove the Bob–Tach lever (Item 1) [D].

A

P–03912

1

2

3

C

P–03928

1

2

3

D

P–03924

1

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B

P–03930

1

BOB–TACH (Cont’d)

Bob–Tach Lever And Wedge (Cont’d)

Using a punch and hammer, remove the roll pin (Item 1)
[A] from the Bob–Tach wedge and spring, bolt and clevis
assembly.

Remove the spring, bolt and clevis assembly (Item 1) [B].

Remove the wedge (Item 2) [B] from the Bob–Tach
frame.

Always replace bent or broken wedges.

If the bolt (Item 1) [C], handle pivot (Item 2) [C], spring
(Item 3) [C] or clevis (Item 4) [C] are damaged, put the
assembly in the vise. Loosen and remove the bolt (Item
1) [C] with a 5/16 inch allen wrench.

Replace the worn or damaged parts as needed.

Reverse the removal procedure to install the Bob–Tach
Lever and Wedge.

Bob–Tach Stops

Remove and replace the Bob–Tach stop (Item 1) [D]
(both sides) if worn or damaged.

NOTE: The Bob–Tach stop (Item 1) [D] must contact

the lift arm at the same time the tilt cylinder
reaches full extension. Use available shims
to adjust the Bob–Tach stop and tilt cylinder
sequence as closely as possible.

A

P–03925

1

C

P–03929

3

4

2

1

D

P–03914

1

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B

P–03926

1

2