KB21 Service Manual Pub 09-14
77
Typical Modes Of failure
Blades Bent: Results from mowing too close to the Ground, or “Powering Down” on trees or stumps.
Tree trimming should be performed slowly and from the side, not from the top down. May also be
sub-standard, after market blades.
Terrain King performs several SAE and ASAE approved test procedures to the blades and mower
assemblies to ensure the durability of the mowing components and reduce the risk of fracture or
failure of the blades. After-market components may not be subject to the same testing standards, and
therefore, may not provide the proper standards of reliability and durability as the Terrain King product.
Extreme care should be taken to ensure that only Terrain King Original Equipment Parts are used when
repairing the mower.
Blade Fracture or Cracking: Could be abuse or material issues. Blades should be returned for
analysis. Could also be after-market (non Terrain King) blades.
Bolt Breakage: Most commonly due to re-use of old bolts on new blades, or failure to inspect for wear
and change within proper parameters.
Could also be substandard ( non-Terrain King blades). Failed bolts should be returned
for inspection.
Blade Bar Bent: Due to abusive operation such as “powering down”, close cutting or impacts.
Due to use of poor quality, after-market components.
Mower Head Structural Cracks: Could be due to impact damage, vibration, abusive operation, or
manufacturing issues. Contact customer service prior to adding additional weight to the mower head
with bracing or gussets.
Vibration of the Mower Head: The cutter is balanced, and should not vibrate when operated at the
rated speed. Possible causes:
Over-speed of tractor resulting in excessive tip speed.
Structural damage: bent blades or blade carrier
Spindle failure: bearings failed.
Excessive Debris Thrown From Mower: Results from any structural damage such as bent
Excessive Debris Hitting the Tractor: When properly operated, the rotary head should discharge
debris away from the tractor. Debris will hit the tractor if the head tilt function of the mower is allowed to
.
OR, the mower blades are turning the WRONG DIRECTION.
The mower blades should rotate in a CLOCKWISE direction when looking down from the top of the
mower.
Deck Worn on the Underside: Due to mowing over sand or other abrasive material. Under side of
deck has sand-blasted appearance. This sand-blasted appearance will also be visible on blades and
carrier.
Mowers & Spindles
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