Sickle Drive Belts - Timed Drive. MacDon D50 & D60

SECTION 8. MAINTENANCE AND SERVICING

c. Tighten nuts (A) on idler mounting bracket.

8.7.9 SICKLE DRIVE BELTS - TIMED

DRIVE

This section applies to 35 FT. and smaller double knife Model D60 Harvest Headers with timed drives.

For single knife headers and non-timed double knife headers, refer to Section 8.7.8 Sickle Drive

Belts - Non-Timed Drive.

E

D

0.02 - 0.04 in.

(0.5 - 1.0 mm) GAP

8.7.9.1 Left End Drive

Remove endshield at left end of header. Refer to

Section 8.4 ENDSHIELDS.

CAUTION

To avoid personal injury, before servicing machine or opening drive covers, follow procedures in Section 8.1 PREPARATION

FOR SERVICING.

d. Check clearance between belt and belt guide (D).

The measurement should be 0.02 - 0.04 in.

(0.5 - 1.0 mm). Adjust as follows:

1. Ensure belt is properly tensioned.

2. Loosen bolts (E), and adjust position of guide as required. e. Re-adjust tension of a new belt after a short runin period, (about 5 hours).

8.7.9.1.1 Tension Adjustment - Timing Belt

IMPORTANT

To prolong belt and drive life, do not over-tighten belt.

8.7.9.1.2 Removal - Left End Timing Belt

A

A

C

F a. Loosen two nuts (A) on sickle drive belt idler bracket.

B a. Loosen two nuts (A) on belt idler bracket to relieve tension on belt. b. Loosen nut (F) on idler pulley, and slide idler down to loosen belt.

G b. Insert a long punch (or equivalent) into hole (B) in idler bracket, and pry “downward” until a force of

6 lbf (27 N) deflects timing belt 1/2 in. (13 mm) at mid-span (C).

Form 169441

101

c. Loosen two bolts (G) on endsheet.

(continued next page)

Revision B

H

SECTION 8. MAINTENANCE AND SERVICING

8.7.9.1.3 Installation - Left End Timing Belt

K

N

J

M d. Loosen two bolts (H) on sickle drive mounting bracket. e. Turn adjuster bolt (J) to loosen the two V-belts

(K), and remove belts. f. Remove bolt in plate

(L) in left endsheet at wobble box, and remove the plate.

L

This provides clearance between the pulley and endsheet for the belt when it is removed. g. Slip timing belt off wobble box pulley, and route the belt between the wobble box pulley and the endsheet. h. Remove belt from drive pulley. a. Locate timing belt (M) onto drive pulley (N).

O

P b. Route belt between the wobble box pulley (O) and the endsheet, and locate on wobble box pulley and over idler (P).

NOTE

When installing new belt, never pry belt over pulley. Be sure adjusting device is fully loosened, then tension belt.

K

H

J

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102

c. Position V-belts (K) onto drive pulleys. d. Turn adjuster bolt (J) to move drive motor until a force of 12 lbf (53 N) deflects V-belts (K) 1/8 in.

(3 mm) at mid-span. e. Tighten the two bolts (H) on drive mounting brackets.

(continued next page)

Revision B

SECTION 8. MAINTENANCE AND SERVICING

f. Tighten the two bolts (G) on the endsheet. g. Slide idler (P) up until most of the belt slack is taken up. Tighten idler nut (F). h. Adjust the timing belt tension, and check belt clearance to belt guide. See 8.7.9.1.1 Tension

Adjustment - Timing Belt. i. Re-install plate (L) in endsheet. j. Re-install left endshield. k. Re-adjust tension of a new belt after a short run-in period, (about 5 hours).

L

8.7.9.1.5 Removal - Left End V-Belts

Refer to illustrations opposite. a. Loosen two bolts (A) on endsheet. b. Loosen two bolts (B) on sickle drive mounting bracket. c. Turn adjuster bolt (C) to loosen the two V-belts

(D), and remove belts.

8.7.9.1.4 Tension Adjustment - Left End

Double V-Belts

A

8.7.9.1.6 Installation - Left End V-Belts

Refer to illustrations opposite. a. Slip belts (D) onto drive pulleys. b. Turn adjuster bolt (C) to move drive motor until a force of 12 lbf (53 N) deflects V-belts (D) 1/8 in.

(3 mm) at mid-span. c. Tighten bolts (A) and (B) on drive mounting bracket. d. Re-adjust tension of a new belt after a short runin period, (about 5 hours).

IMPORTANT

Sickle drive V-belts are a matched set.

Replace both drive belts even if only one needs replacing. Do not pry belt over pulley, loosen adjusting device sufficiently to allow easy installation. a. Loosen two bolts (A) on endsheet.

D

B

C b. Loosen two bolts (B) on sickle drive mounting bracket. c. Turn adjuster bolt (C) to move drive motor until a force of 12 lbf (53 N) deflects V-belts (D) 1/8 in.

(3 mm) at mid-span. d. Tighten bolts (A) and (B). e. Re-adjust tension of a new belt after a short runin period, (about 5 hours).

Form 169441

103

Revision B

SECTION 8. MAINTENANCE AND SERVICING

8.7.9.2.3 Installation - Right End Timing Belt

CAUTION

To avoid personal injury, before servicing machine or opening drive covers, follow procedures in Section 8.1 PREPARATION

FOR SERVICING.

8.7.9.2.1 Tension Adjustment - Timing Belt

IMPORTANT

To prolong belt and drive life, do not over-tighten belt.

Refer to 8.7.9.1.1 Tension Adjustment - Timing

Belt.

8.7.9.2.2 Removal - Right End Timing Belt

a. Open right endshield.

D

F

E a. Route timing belt (D) between the wobble box pulley (E) and the endsheet, and locate on wobble box pulley, and over idler (F).

NOTE

When installing new belt, never pry belt over pulley. Be sure adjusting device is fully loosened, then tension belt.

A

G

B b. Loosen two nuts (A) on belt idler bracket, to relieve tension on belt. c. Loosen nut (B) on idler pulley, and slide idler down to loosen belt. d. Remove bolt in plate

(C) in right endsheet at wobble box, and remove the plate.

C

This provides clearance between the pulley and endsheet for the belt when it is removed. e. Slip timing belt off wobble box pulley, and route the belt between the wobble box pulley and the endsheet. f. Remove belt from drive pulley.

Form 169441 b. Position timing belt on drive pulley (G). c. Adjust the timing belt tension, and check belt clearance to belt guide. See 8.7.9.1.1 Tension

Adjustment - Timing Belt.

C

104

d. Re-install plate (C) in endsheet. e. Close left endshield. f. Re-adjust tension of a new belt after a short runin period, (about 5 hours).

Revision B

SECTION 8. MAINTENANCE AND SERVICING

Double knife D60 Harvest Headers 35 FT. and smaller require that the sickles are properly timed to move in opposite directions.

To adjust the sickle timing, proceed as follows: a. Remove the right sickle drive belt. Refer to

Section 8.7.9.2.2 Removal - Right End Timing

Belt.

C

LEFT

SICKLE

DIRECTION OF

MOVEMENT

RIGHT

SICKLE

A

LEFT

SICKLE

DIRECTION OF

MOVEMENT

RIGHT

SICKLE

B

SECTIONS CENTERED

BETWEEN GUARDS D b. Rotate the left wobble box driven pulley (A) clockwise until the left sickle (B) is at the center of the inboard stoke (moving towards center of header).

NOTE

Center stroke is when the sickle sections are centered between guard points as shown.

B

SECTIONS CENTERED

BETWEEN GUARDS

D c. Rotate the right wobble box pulley (C) counter clockwise until the right sickle (D) is at the center of the inboard stroke. d. Install the right wobble box drive belt, and adjust tension. Refer to Section 8.7.9.2.3 Installation -

Right End Timing Belt.

IMPORTANT

To maintain timing, wobble box driver and driven pulleys must not rotate as the belt is tightened. e. Check that the timing belts are properly seated in the grooves on both driver and driven pulleys. f. Check for correct sickle timing by rotating the drive slowly by hand, and observe sickles where they overlap at the center of the header.

IMPORTANT

Sickles must move in opposite directions, and must begin moving at exactly the same time.

If timing is off, proceed as follows:

1. Loosen right belt sufficiently to allow skipping the belt one or more teeth as required. Refer to Section 8.7.9.2.1 Tension Adjustment -

Timing Belt.

2. If right sickle “leads” left sickle, rotate RIGHT

SIDE driven pulley (C) clockwise.

3. If right sickle “lags” left sickle, rotate RIGHT

SIDE driven pulley (C) counter clockwise.

4. Tighten right belt.

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105

Revision B