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OPERATION
SHD 03/09 Operation Section 4-7
© 2009 Alamo Group Inc.
OPERATION
3.3 Tractor Horsepower
The horsepower required to operate the mower depends on many factors including the vegetation to be cut,
terrain condition, operator experience, and condition of the mower and tractor. For most mowing condition, the
SHD62 mower requires a tractor with at least 20HP, SHD74-35HP, SHD-88-40HP and SHD96-50HP.
Operating the mower with a tractor that does not have adequate power may damage the tractor engine.
3.4 3-Point Hitch
The tractor 3-point hitch must be rated to lift at least
815 lbs.if attaching a SHD62, 930 lbs. if attaching a
SHD74, 1035 lbs. if attaching SHD88, and 1170 lbs.
if attaching a SHD96 flail.
SHD mowers can attach to tractor’s 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 can 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 ....................................1-1/8”
Upper pin diameter ...........................................3/4” Upper pin diameter .......................................... 1”
Linch pin diameter ........................................15/32” Linch pin diameter .................................... 15/32”
3.5 Front End Weight
Maintain a minimum of 20% total tractor weight on the tractor front end at all times. Front end weight is critical
to maintain steering ability and to prevent the front end from rearing up. Consult your authorized tractor dealer
for front weights and carriers.
3.6 Power Take Off (PTO)
Only operate the mower on a tractor equipped to operate at 540 rpm PTO speed. Tractors operating at 540
rpm will have a 1-3/8” diameter 6-spline PTO shaft stub. Refer to the tractor operator’s manual for operating
the PTO at the proper speed.
If operating an older model tractor where the tractor’s transmission and PTO utilize one master clutch, an over-
running clutch must be used between the PTO output shaft and the driveline of the mower. Consult an
authorized tractor dealer to purchase and install an over-running clutch if needed.