Macdon 4000 Mower Conditioner User Manual download pdf (Page 51)

MAINTENANCE/SERVICE

KNIFE AND KNIFE DRIVE (continued)

Knife Drive Belt Tension

IMPORTANT: To prolong belt and drive life, do not

over-tighten belt.

To adjust:

1. Loosen nut (A).

2. Back off nut (B).

3. Turn adjuster nut (C) until recommended

tension is reached.

RECOMMENDED TENSION:

New belt - a force of 20 lbs. (90 N) deflects belt 1/4

in. (6 mm) at mid-span.

Used belt - a force of 12 lbs. (55 N) deflects belt

1/4 in. (6 mm) at mid-span.

4. Tighten nuts (A) and (B).

5. Re-adjust tension of a new belt after a short

run-in period, (about 5 hours) to used belt

specifications.

Knife Drive Belt Replacement

To remove belt:

1. Remove shield (D).

2. Scratch an alignment mark on pulley (E) and

yoke plate (F) to maintain roll timing on re-

assembly.

3. Remove three bolts (G) and remove yoke

plate.

4. Slacken the belt as follows:

- loosen nut (A)

- back off nut (C)

- turn nut (B) until nut (A) clears wobble box

pulley

5. Remove belt.

When installing new belt, be sure to:

1. Align marks on pulley and yoke plate.

NOTE: Spline shaft and yoke will mate in one

position only.

2. Tighten three bolts (G) to 70 ft.lbs. (95 N.m).

3. Install shield (D).

4. Properly adjust belt tension. Never pry belt

over pulley.

KNIFE DRIVE BELT

TENSION ADJUSTMENT

KNIFE DRIVE BELT REMOVAL

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Macdon 4000 Mower Conditioner User Manual Page 51

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