Sickle Guards. MacDon D50 & D60

SECTION 8. MAINTENANCE AND SERVICING

Check daily that guards are aligned to obtain proper shear cut between sickle section and guard. Sickle sections should contact shear surface of each guard.

To align guards, proceed as follows: The guard straightening tool (MacDon part #140135) is available from your MacDon Dealer:

CAUTION

Always engage reel props before working under reel.

8.7.6.2.1 Pointed Guards - Single Knife

To replace pointed guards in single knife D50 and

D60 Harvest Headers, proceed as follows: a. Stroke the sickle so that the sickle sections are spaced midway between the guards.

A

UPWARD ADJUSTMENT a. To adjust guard tips upwards, position tool as shown and pull “up”.

C

B b. Remove the two nuts (A) and bolts that attach guard (B) and hold-down (C) (if applicable) to the cutterbar. c. Remove the guard, hold-down, and poly wear plate (if installed). d. Position new guard and poly wear plate (if applicable) on cutterbar, and install carriage bolts.

IMPORTANT

The first four outboard guards on drive side(s) of the header do not have a ledger plate. Ensure that the proper replacement is installed.

DOWNWARD ADJUSTMENT b. To adjust tips downward, position tool as shown and push “down”.

TIP: If trouble is encountered cutting tangled, or fine-stemmed material, replace lower guards with stub guards, and install a sickle hold-down on every guard.

If material is tough to cut, install stub guards with top guard and adjuster plate. A stub guard conversion kit is available from your MacDon

Dealer. Refer to Section 10.3 STUB GUARD

CONVERSION KIT.

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NORMAL DRIVE SIDE END e. Install hold-down, and secure with nuts. Tighten nuts to 50 ft·lbf (68 N·m). f. Check and adjust clearance between hold-down and sickle. Refer to Section 8.7.7 Sickle Hold-

Downs.

Revision B

SECTION 8. MAINTENANCE AND SERVICING

8.7.6.2.2 Pointed Guards - Double Knife

Refer to previous section for typical guard replacement.

The guard near the center of the double knife header, where the two sickles overlap, requires a slightly different replacement procedure.

Replace the center guard or center top guide as follows: d. Check and adjust clearance between hold-down and sickle. Refer to Section 8.7.7 Sickle Hold-

Downs.

8.7.6.2.3 Stub Guards - Single Knife

Stub guards, complete with top guides and adjuster plates are designed to cut tough crops.

Only the D60 Harvest Header 15, 20, and 25 FT. models can be equipped with stub guards.

Replace stub guards as follows:

E

D

G

C

A

F

B a. Remove the two nuts (A) and bolts that attach guard (B) and top guide (C) to cutterbar. b. Remove guard, poly wear plate (if installed), top guide (C), and adjuster bar (D). c. Position poly wear plate (if applicable), replacement guard (B), adjuster bar (D), top guide (C), and install bolts, but do not tighten.

IMPORTANT

Ensure center guard (B) (right of cutterbar split) has offset cutting surfaces. See illustrations.

H a. Remove the two nuts (E) and bolts that attach guard (F) and top guide (G) to cutterbar. b. Remove guard, poly wear plate (if installed), top guide, and adjuster bar (H). c. Position poly wear plate (if applicable), replacement guard (F), adjuster bar (H), top guide

(G), and install bolts. Do not tighten.

C

B

CENTER NORMAL

NOTE

Top guide (C) must accommodate the two overlapping knives at center guard location on double-knife header.

Ensure replacement is correct part.

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NORMAL

DRIVE SIDE

IMPORTANT

Note position of mitre on adjuster bar

(H). Bar should be re-installed in same position. Mitres should not be adjacent to each other.

IMPORTANT

The first four outboard guards on drive side(s) of the header do not have a ledger plate. Ensure that the proper replacement is installed. d. Check and adjust clearance between top guide and sickle. Refer to Section 8.7.7 Sickle Hold-

Downs.

Revision B

SECTION 8. MAINTENANCE AND SERVICING

8.7.6.2.4 Stub Guards – Double Knife

Refer to previous section for typical guard replacement.

The guard at the center of the double knife header, where the two sickles overlap, requires a slightly different replacement procedure.

To replace the center guard or center top guide, proceed as follows:

D

A C NORMAL

B

CENTER a. Remove the two nuts (A) and bolts that attach guard (B) and top guide (C) and adjuster bar (D) to cutterbar. b. Remove guard, poly wear plate (if installed), top guide (C), and adjuster bar (D). c. Position poly wear plate (if applicable), replacement guard (B), adjuster bar (D), top guide (C), and install bolts but do not tighten.

IMPORTANT

Ensure center guard (B) (right of cutterbar split) has offset cutting surfaces. See illustration.

NOTE

Top guide (C), which is an inverted normal stub guard, must accommodate the two overlapping knifes at center guard location on double-knife header.

Ensure replacement is correct part.

d. Check and adjust clearance between hold-down and sickle. Refer to Section 8.7.7 Sickle Hold-

Downs.

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Revision B