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RTR12 & RTA12 Series (Serial No. 884764-) Rotary Tillers 311-785M
8/12/14
Section 3: Adjustments
Table of Contents
Section 3: Adjustments
Clevis Offset
Figure 3-1
RTR12 Series Chain Tightener
Figure 3-2
RTA12 Series Chain Tightener
Figure 3-3
30352
Adjust
To Suit
Hold 26 7/8"
Adjust Clevis Left or Right
Up To 7" Maximum
30353A
Torque L.H. Jam Nut
Counterclockwise to 400 ft-lbs.
Torque Chain Tightener Stud
Counterclockwise 20 to 30 ft-lbs.
Arrow showing
Counterclockwise Rotation
30371A
Torque R.H. Jam Nut
Clockwise to 400 ft-lbs.
Torque Chain Tightener Stud
Clockwise 20 to 30 ft-lbs.
Arrow Showing
Clockwise Rotation
RTA & RTR12 Tiller Hitch Offset
Refer to Figure 3-1:
!
CAUTION
Do not exceed offsetting tiller 7" left or right of gearbox input
shaft. Doing so can break the driveline, tractor PTO, and tiller
gearbox.
!
CAUTION
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 when the
hitch clevis are set an equal distance away 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 far enough to cover the
tractor’s right rear wheel tread marks.
1. Loosen hex nuts (#2) until clevises (#1) can be
moved on the front 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. Retighten 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. Retighten 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. Retighten 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.