Farm Star T55-74 - Manual (Page 24)

O P E R ATING INSTRUCTIONS (continued) O W N E R S E RVICE (continued)
S H E A R B O LT DRIVELINE
SOME T40 MODELS
Tiller drive components are protected from shock loads
by a M8 shear bolt (part number 320233).
If the shear bolt shears, replace with part number
320233. On a temporary basis, you can use a 5 / 16 ” – 18
NC x 2” long grade 5 bolt. Torque nut to 7-9 foot pounds.
Shear bolt failure can be avoided by engaging the PTO
slowly at low engine rpm and rotor above ground.
S L I P C L U T C H A D J U S T M E N T
The slip clutch is designed to slip, protecting the gear-
box and driveline, should the cutter strike an obstruction.
The slip clutch is factory preset to the correct torque for
protecting implement and tractor.
A new slip clutch, or one that has been in storage over
the winter, may seize. Before operating, make sure it will
slip by performing this operation:
• Make sure tractor engine is turned off and key is
removed.
• Remove driveline from tractor PTO.
• Loosen the eight bolts to remove all tension from
springs. (Until spring can be turned with fingers.)
• Hold clutch hub solid and turn shaft to make sure
clutch slips.
• If clutch does not slip freely, disassemble and clean
the faces of clutch plate, yoke and plate, and clutch
hub.
• Reassemble clutch.
T I N E R E P L A C E M E N T
The hoe blades Ref. 4 Fig. 8 must be replaced if they are
damaged, bent, worn, blunt or liable to break during work.
Remove the damaged hoe blades by unscrewing bolts
(Ref. 1) and fitting new blades in their place.
Take great care to ensure that the new blades are
mounted in the same position as the old ones.
If more than one hoe blade must be replaced, change
one blade at a time to prevent possible positioning error.
NOTE: The sharp side of the blades must point in the
same direction as that in which the rotor turns.
The bolts that fix the blades to the rotor flange must be
mounted with the head of bolt (Ref. 1) on the blade side
and with washer (Ref. 2) and nut (Ref. 3) on the flange
side.
• Tighten each of the eight bolts evenly until the springs
are compressed to the proper dimension for your tiller
model as shown in Figure 7. T40 Model length is 1
3 / 16 ”
(1.187) and T55 Model length is 1 5 / 32 ” (1.156).
If a clutch continues to slip when the springs are com-
pressed to the proper length as shown in Figure 7, check
friction disc for excessive wear. Discs are
1 / 8 ” when new.
Replace discs after 1 / 16 ” wear. Minimum disc thickness is 1 / 16 ”.
SLIP CLUTCH DRIVELINE
SOME T40 MODELS – ALL T55 MODELS
Tiller drive components are protected from shock loads
by a 2-plate slip clutch.
The clutch should slip during operation to protect the
tiller from excessive loads.
Prior to initial operation and after long periods of inac-
tivity, the slip clutch should be serviced.
For instructions on slip clutch adjustment and service,
check Owner Service section of this manual (page 22).
G E A R B O X & C H A I N C A S E
G E A R L U B E
Before operating this unit check oil level. Add 80-90 EP
Gear Lube to the gearbox and chaincase if needed. With
the tiller in a level position, fill to the side inspection hole
with a good 90 wt. gear lubricant. Check often and add
lubricant if necessary.
G E N E R A L S A F E T Y
System (ROPS) and a seat belt be used. Before begin-
ning operation, clear work area of objects that may be
picked up and thrown. Check for ditches, stumps, holes,
or other obstacles that could upset tractor or damage
tiller. Always turn off tractor engine, set parking brake,
lower tiller to ground before dismounting tractor.
The designed and tested safety of this machine
depends on it being operated within the limitations as
explained in this manual. Be familiar with and follow all
safety rules in the manual, on the mower and on the
tractor.
The safe operation of this machine is the responsibility of
the owner/operator. The operator should be familiar with
the mower and tractor and all safety practices before start-
ing operation. Read the safety rules on pages 5 thru 14.
Only qualified people familiar with this manual should
operate this machine. Operator should wear hard hat,
safety glasses, and safety shoes. It is recommended
that tractor be equipped with Roll-Over Protective
The tilling depth is established by the two side skids on
the tiller. Lower the skids for a shallower work depth or
raise them for a deeper work depth. Tighten all bolts after
adjusting the skids. Make sure both sides are the same
height.
Safety is a primary concern in the design and
manufacture of our products. Unfortunately, our efforts
to provide safe equipment can be wiped out by a
single careless act of an operator.
It has been said, “The best safety device is an
informed, careful operator”. We ask you to be that
kind of an operator.
C A U T I O N !
Do not operate the PTO at other than the rated 540
RPM. Excessive speeds can cause breakage, thrown
objects, and potential injury.
C A U T I O N !
Worn tines may be very sharp! Leather work gloves
are recommended.
NOTE: Replace tines with Worksaver replacement
tines. The use of other tines could affect tiller
operation.
A D J U S T I N G F O R W O R K
Always be careful to check that the power rating of the
tractor used to tow the implement does not exceed the
maximum power rating for your model tiller. Using too
large a tractor can cause damage to the tiller and voids
the warranty.
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W A R N I N G !
▲ Lower tiller to ground or block securely, turn trac-
tor engine off, remove key and disconnect tiller
driveline from tractor PTO before performing any
service or maintenance.
▲ Before working underneath, raise 3-pt. hitch to
highest position and block tiller securely.
Hydraulic system leakdown and failure of
mechanical or hydraulic system can cause equip-
ment to drop.
▲ Keep all persons away from operator control area
while performing adjustments, service or mainte-
nance.
• Having obtained the maximum possible tension with
the hands alone, unscrew idler bolt one turn, then
keep it in this position by tightening lock nut.
• Turn the rotor several times by hand to check that it
rotates without encountering excessive resistance.
If the rotor jams in a certain point, repeat the chain ten-
sioning procedure from the beginning.
FIELD ADJUSTMENT
If necessary, adjust nut on any spring that is unequal.
Adjust all eight spring retaining nuts 1/3 of a turn (2 flats
on a nut) and check clutch slippage. If further adjustment
is necessary, do so in 1/3 turn increments. Adjust only to
provide sufficient torque to prevent slippage under nor-
mal conditions. Occasional slippage is normal for drive-
train protection. If satisfactory results cannot be obtained,
clutch discs and springs may have to be replaced.
NOTE: Constant clutch slipping could be due to field
conditions – check Troubleshooting section in manual.
Figure 7
Figure 8
T I G H T E N I N G T R A N S M I S S I O N
C H A I N
( C O N T I N U E D )
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