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OPERATION
PA91 02/08 Operation Section 4-8
© 2009 Alamo Group Inc.
OPERATION
3.7 3-Point Hitch
PA91 boom mowers can attach to tractors with
either a CAT I or II hitch. Refer to the tractor
operator’s manual for the category of the tractor
used. If the hitch does not conform to ASAE Cat I
or II dimensions, the mower may not fit or raise
properly. Consult an authorized dealer for possible
modification procedures to mount nonconforming
hitches.
Use the correct hitch pins for the hitch category
being used. For a Cat I hitch, 7/8” lower and 3/4”
upper diameter hitch pins are used and Cat II
hitches require 1-1/8” lower and 1” upper diameter
hitch pins.
CAT I Implement / Hitch Specification CAT II Implement/ Hitch Specification
Width from outside to outside A-frame......26 7/8” Width from outside to outside A-frame ...... 32-3/8”
Quick Hitch width inside lug to lug ...........27 1/8” Quick Hitch width inside lug to lug............. 33-5/8”
Height from bottom hitch pin to top pin...........18” Height from bottom hitch pin to top pin.............19”
Lower pin diameter ........................................7/8” Lower pin diameter.................................... 1-1/18”
Upper pin diameter .......................................3/4” Upper pin diameter.............................................1”
Lynch pin diameter ....................................15/32” Lynch pin diameter ......................................15/32”
3.8 Hydraulics
The PA91 is available with either a Semi or Totally Independent hydraulic system complete with rotor rotation
control. The semi-independent system takes its power from the tractor external hydraulic supply while the fully
independent system is operated by an extra lever on the control console, which allows selection of rotor
rotation.
3.9 Front End Weight
A minimum of 20% total tractor weight must be maintained on the tractor front end at all times. Front end
weight is critical to maintain steering control and to prevent the tractor from rearing up while driving. If the
front end is too light, add weight until a minimum of 20% total weight is reached on the front tires. Front
weights and weight carriers can be purchased through an authorized tractor dealership. OPS-U- 0005