Bush Hog SBLM66, Operator'S Manual

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Effective PTO Drive Shaft Maintenance
Avoidable Damage Possible Causes Corrective
Actions
Quick-disconnect yoke
Quick-disconnect pin tight or
completely seized
Quick-disconnect pin damaged
(broken or bent)
Quick-disconnect pin damaged
in locking position
Quick-disconnect pin
dirty (insufficient
maintenance)
Quick-disconnect pin
defective (forced into
place, incorrect
handling.
Excessive shaft length
Axial load too high
Clean, oil and follow
service instruction
Replace Quick-
disconnect pin
Shorten shaft length
(cut both telescopic
tubes as well as shield,
remove burrs)
Replace Quick-
disconnect pin
Clean and grease
telescopic tubes.
Replace both tubes if
necessary
Note: newer PTO shafts may have a locking collar. (Damages Causes and corrective actions will
still be similar.
Avoidable Damage Possible Causes Corrective Actions
Deformed Yoke Excessive shaft length
Axial load too high
Excessive working angle
and torque
Shorten shaft length (cut
both telescopic tubes as
well as shield, remove
burrs)
Replace defective yokes
Clean and grease
telescopic tubes. Replace
both tubes if necessary
Replace defective yokes
Verify compatibility
between shaft and working
conditions (torque vs.
angle)
Disengage tractor PTO
during lifting or lowering
the implement.
Change to a larger PTO
size
Distorted Yoke Overload caused by high
starting and peak torque
Engage PTO more
carefully
Use appropriate safety
device
Replace defective yoke
Worn or pounded Yoke Excessive working angle Avoid excessive angle
Replace defective yokes
Yoke
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