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OPERATION
DB150 07/11 Operation Section 4-5
© 2011 Alamo Group Inc.
OPERATION
2.4 3-Point Hitch
The tractor 3-point hitch must be rated to lift at least
2140 lbs.
The DB150 boom mower is designed to be
mounted on a tractor with a CAT II or III 3-point
hitch. Refer to the tractor operator’s manual for the
category of the tractor being used. If the hitch does
not conform to ASABE CAT II or III dimensions, the
mower may not fit or raise properly. Consult an
authorized dealer for possible modification
procedures to mount nonconforming hitches.
Depending on the hitch category, certain size pins are used to attach the mower to the tractor. CAT II hitches
require 7/8” lower and 3/4” upper diameter hitch pins. CAT III hitches require 1-7/16” lower and 1-1/4” upper
diameter size pins.
CAT II Implement / Hitch Specification CAT III Implement/ Hitch Specification
Width from outside to outside A-frame......... 32-3/8” Width from outside to outside A-frame............38”
Quick Hitch width inside lug to lug .............. 33-5/8” Quick Hitch width inside lug to lug ........... 39-1/4”
Height from bottom hitch pin to top pin .............. 19” Height from bottom hitch pin to top pin ...........22”
Lower pin diameter ...................................... 1-1/18” Lower pin diameter .................................. 1-7/16”
Upper pin diameter ............................................. 1” Upper pin diameter .................................... 1-1/4”
Lynch pin diameter........................................ 15/32” Lynch pin diameter ....................................15/32”
2.5 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
2.6 Power Take Off (PTO)
Depending on the unit, the mower is designed to operate at a PTO speed of 540 or 1000 RPM. Most tractors
operate at either 540, or a combination of 540 and 1000 RPM PTO speeds. The operating speed of the
mower and tractor can be determined by the number of splines on the driveline yoke and PTO output shaft.
Those operating at 540 RPM will have a 6-spline shaft and those operating at 1000 RPM will have a 21-spline
shaft or a 1-3/4” 20 spline shaft. Refer to the tractor owner’s manual for instructions to change PTO speeds on
models that operate at more than one 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. An
authorized tractor dealer can provide the over-running clutch and its installation if needed. OPS-U- 0006