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Figure 4-3
Spring Length
MODEL SPRING LENGTH
285 &286 1-3/32” or 27.6 mm
287 1-1/8” or 28.5 mm
13
turning blades. If clutch does not slip, contact your
authorized Bush Hog dealer.
C. Retighten nuts to within 1/64” of original posi-
tion. Initial spring length is shown in Figure 4-3.
4-6 SLIP CLUTCH ADJUSTMENT
The slip clutch is factory preset to the correct torque
for protecting implement and tractor. Periodic
adjustment is recommended; refer to section 4-5.
Should adjustment be needed, first check to be sure
all spring lengths are the same. Initial spring length
is shown in Figure 4-3. If necessary, adjust nut on
any spring that is unequal. Adjust all eight spring
retaining nuts 1/3 of a turn (2flats on a nut) and
check clutch slippage. If further adjustment is neces-
WARNING
OVERTIGHTENING SPRING NUTS MAY
CAUSE DAMAGE TO IMPLEMENT AND/OR
TRACTOR DUE TO INCORRECT SLIP CLUTCH
TORQUE SETTING. ALWAYS FOLLOW THE
PROPER ADJUSTMENT PROCEDURE.
sary, do so in 1/3 turn increments. Adjust only to
provide sufficient torque to prevent slippage under
normal conditions. Occasional slippage is normal
for drivetrain protection. If satisfactory results cannot
be obtained, consult your Bush Hog dealer.
IMPORTANT
Do not overtighten nut and cause spring to
become solid as this will cause shaft to fail.
Table 4-1 General Troubleshooting
PROBLEM PROBABLE CAUSE REMEDY
Uneven Cut Cutter not level side to side. See SECTION II
Worn or bent blades. Replace blades per paragraph 4-4.
Stripping or Windrowing Possible build-up of material under Clean cutter.
cutter.
Cutter not level. Refer to Section II.
Worn blades. Replace per paragraph 4-4.
Noisy Cutter Loose components. Check al bolts for tightness per
paragraph 20.
Low oil in gearboxes. Check for proper oil level. Refer to
paragraph 4-2.
Rapid Blade Wear Blade contacting the ground. Adjust cutter to operate at a height
(Cutting Edge) that will eliminate ground contact.
Rapid Blade Wear Cutter not being operated at Reduce ground speed.
(Bolt Hole) rated RPM speed. Set tractor throttle for proper PTO
speed.
Too much ground speed. Use lower gear.
Poor Shredding Job Incorrect deck tilt. Adjust per paragraph 3-2.
Excessive ground speed. Reduce ground speed.
Worn blades. Replace blades per paragraph 4-4.
Cutter Vibration Cutter not being operated at rated Set tractor throttle for proper PTO
RPM speed. speed.
Possible build up of material on Clean blade pan.
blade pan.
Broke blade. Replace blades per paragraph 4-4.
Blades unequal weight. Replace blades per paragraph 4-4.