Section 2: Adjustments
7/31/20
RC4620 & RCM4620 Rotary Cutters 331-936M
32
Section 2: Adjustments
Park Jack Alignment
Figure 2-1
Park Jack Angle Alignment
Refer to Figure 2-1:
Jack mount (#1) should be adjusted to position park
jack (#7) vertical while supporting the cutter hitch. This
angle will vary depending on the number and size of
stroke control spacers placed on the lift cylinder rod.
1. With cutter hitched to a tractor, lower cutter to storage
height.
2. Shut tractor down properly before dismounting. Refer
to
3. Install park jack (#7) to jack mount (#1). See
on page 17. Check jack angle.
•
If jack angle is vertical, skip to step 9.
•
If jack angle is not vertical, continue with step 4.
4. Remove hex nut (#3), lock washer (#5) and carriage
bolt (#2).
5. Loosen 1" hex nut (#4). Do not remove.
6. Rotate jack mount (#1) to align jack as near vertical
as possible.
7.
Replace 1/2"-13 x 1 1/2" GR5 carriage bolt (#2) and
secure with lock washer (#5) and hex nut (#3).
Tighten hex nut (#3) to the correct torque.
8. Tighten 1" hex nut (#4) to 645 ft-lbs.
9. If moving cutter, skip to step 10. If unhooking cutter,
on page 29 for detailed
instructions.
10. If cutter is to be moved, remove park jack (#7) from
jack mount (#1) and attach it to the left-hand wing
storage base. Make sure base of park jack is level
with or lower than the head, especially after the wings
are folded up. See cover picture for correct
positioning.
37576
NOTE:
If cutter is not hitched securely to a tractor,
support blocks should be placed under the front
skid shoes to support cutter while aligning the park
jack vertically.
NOTE:
Refer to decal (#6) and instructions below
for jack alignment and torque value instructions.
Level Cutter Decks
Make adjustments with cutter hooked to the tractor
operating it or to one with the same drawbar height.
Center Deck Leveling
Refer to Figure 2-2 on page 33:
1. With cutter attached to a tractor, disengage power
take-off, and park on a level, hard surface. Place
tractor gear selector in park or set park brake.
2. Wait for blades to come to a complete stop and then
fold wings up to transport position.
3. Shut tractor engine off and remove switch key before
dismounting from tractor.
4. Lock wings folded up with transport locks (#3) and
hairpin cotters (#1) as shown. See
on page 38 for detailed instructions.
Refer to Figure 2-3 on page 33:
5. With tractor hydraulics, adjust center deck until front
skids (#7) are 2 to 3 inches above ground.
6. Without changing deck height, shut tractor down
properly before dismounting.
7.
On each side of the center deck are continuous
hinges (#2). Measure height of hinges as follows:
a.
Refer to
measure distance from bottom of right hinge (#2)
to ground and from bottom of left hinge to ground.
These two measurements should be equal.
b.
Refer to
measure distance from bottom of right hinge (#2)
to ground and from bottom of left hinge to ground.
These two measurements should be 1" less than
the rear measurements taken in step a.
Refer to Figure 2-2 on page 33:
8. Adjust length of leveling rods at coupler nuts (#6) if
continuous hinges are not 1" lower at the front:
If continuous hinges are too high at the front:
a. Loosen jam nuts (#5).
b. Unscrew coupler nuts (#6) an equal amount to
lower front of cutter until both hinges are inclined
from front to back by 1" with the front being closer
to the ground than the back.
If continuous hinges are too low at the front:
a. Loosen jam nuts (#5) several turns.
b. Tighten coupler nuts (#6) an equal amount to
raise front of cutter until both hinges are inclined
from front to back by 1" with the front being closer
to the ground than the back.
9. Be sure leveling rods have equal amounts of tension
and then tighten jam nuts (#5) against couplers (#6).
NOTE:
Unscrewing coupler nuts (#6) will lengthen
leveling rods and lower front of cutter. Tightening
coupler nuts (#6) will shorten leveling rods and raise
front of cutter.
