Section 3: Adjustments
RTR12 & RTA12 Series (Serial No. ) Rotary Tillers 311-883M
11/19/19
26
Section 3:
Adjustments
Clevis Offset
Figure 3-1
RTR12 Series Chain Tightener
Figure 3-2
RTA12 Series Chain Tightener
Figure 3-3
HOLD
"
26-7/8
ADJUST
TO SUIT
30352A
Adjust Clevis Left or Right
Up To 7" Maximum
30353
Torque L.H. Jam Nut
Counterclockwise to 400 ft-lbs.
Torque Chain Tightener Stud
Counterclockwise 20 to 30 ft-lbs.
Arrow showing
Counterclockwise Rotation
30371
Torque R.H. Jam Nut
Clockwise to 400 ft-lbs.
Torque Chain Tightener Stud
Clockwise 20 to 30 ft-lbs.
Arrow Showing
Clockwise Rotation
Hitch Offset
Refer to Figure 3-1:
WARNING
!
To avoid serious injury or death:
•
Do not offset tiller more than 7" left or right of the gearbox
input shaft. Doing so can damage the driveline, tractor
power take-off, and tiller gearbox.
•
After offsetting, check to see that the driveline clears all
shields on the tiller, tractor, and tiller hitch. If not, decrease
offset until clearance is obtained.
Except for RTA1242, the RTA12 & RTR12 Series tillers
can be shifted a maximum offset of 7
"
left or right of the
gearbox input shaft by moving the hitch clevises (#1)
7
"
to the right or left.
The RTA1242 is built to be offset 5
"
to the right with hitch
clevises set at an equal distance from the gearbox input
shaft. The unit can be shifted a maximum of 7
"
to the left
by moving the hitch clevis 7
"
to the right.
For best tillage results, adjust tiller offset to the right by
moving the hitch clevis to the left to cover the tractor’s
right rear wheel tire marks.
1. Loosen hex nuts (#2) until clevises (#1) will slide on
the front square tube.
2. Slide lower hitch clevises (#1) an equal amount left or
right up to 7
"
while holding the 26 7/8
"
distance
between clevises.
3. Tighten hex nuts (#2) to the correct torque value.
Drive Chain Tension
The drive chain tension can be adjusted by rotating the
chain tightener stud. Should excessive chain backlash
occur, tighten stud as noted below.
RTR12 Series Tillers
Refer to Figure 3-2:
1. Loosen jam nut and torque chain tightener stud
counterclockwise
20 to 30 ft-lbs.
2. Tighten jam nut to 400 ft-lbs. Be sure to hold chain
tightener stud in position while tightening jam nut.
RTA12 Series Tillers
Refer to Figure 3-3:
1. Loosen jam nut and torque chain tightener stud
clockwise
20 to 30 ft-lbs.
2. Tighten jam nut to 400 ft-lbs. Be sure to hold chain
tightener stud in position while tightening jam nut.
IMPORTANT:
Jam nut has left-hand threads.
Loosen nut by turning it clockwise.
IMPORTANT:
Chain tightener nut has right-hand
threads. Loosen nut by turning it counterclockwise.
