Maintenance/service – MacDon 963 Harvest Header User Manual

Page 47

MAINTENANCE/SERVICE

SICKLE AND SICKLE DRIVE (continued)

NOTE: The sickle drive assembly at the left end of the

header varies depending on the application (windrower

or combine). For instructions to convert from one drive

configuration to the other, see Assembly section at the

back of this book.

Sickle Drive Belt Tension

Check sickle drive belt tension after the first 5 hours

operation and every 100 hours thereafter.

IMPORTANT: To prolong belt and drive life, do not

over-tighten belt. Operate at minimum tension required

to prevent slipping or excessive belt whip. When

installing a new belt, never pry belt over pulley. Loosen

adjusting device sufficiently to allow easy installation.

To adjust:

1. Loosen nut (A).

2. Turn nut (B) to move idler pulley up or down

(depending on drive configuration) to tighten belt

until a force of 18 lbs. (80 N) deflects belt 3/4 inch

(20 mm) at mid-span.

3. Tighten nut (A).

NOTE: To remove belt, back off idler pulley and

remove bolt-on panel in left end sheet at wobble box.

Turn belt on edge and work it up and over pulley hub

as shown.

Wobble Box Mounting Bolts

Tighten the four wobble box mounting bolts (C) after

the first 10 hours operation and every 100 hours

thereafter. Torque to 200 ft.lbs. (270 N

⋅

m), starting with

the side mounting bolts.

Wobble Box Lubricant

Check wobble box lubricant level before first operation

and every 100 hours thereafter.

To check:

1. Raise header to a point where the wobble box base

is approximately level.

2. Remove breather/dipstick (D). Oil level must be

between end of dipstick and bottom hole (or

groove) in dipstick.

3. Add as required.

Change wobble box lubricant after first 50 hours

operation and every 1000 hours or 3 years thereafter.

To drain wobble box, raise header fully and engage

header lift cylinder stops. Remove breather/dipstick

(D) and drain plug (E).

Use SAE 85W-140 gear lubricant (API Service

Classification GL-5). Capacity of box is 2.2 litres (2.3

U.S. quarts)

REMOVING SICKLE DRIVE BELT

WOBBLE BOX

SICKLE DRIVE BELT TENSION - SHOWN IN

COMBINE CONFIGURATION