Bush Hog HDTH8, Operator'S Manual, Page: 111 / 172

HDTH 8 Finish Mower 09/20
Operation Section 4-9
© 2020 Alamo Group Inc.
OPERATION
OPERA
TION
Driveline Length Modification
Before operating the Implement, check to make sure the Implement input driveline will not bottom
out or become disengaged. Bottoming out occurs when the inner shaft penetrates the outer hous-
ing until the assembly becomes solid-it can shorten no more. Bottoming out can cause serious
damage to the Tractor PTO by pushing the PTO into the Tractor and through the support bearings
or downward onto the PTO shaft, breaking it off. A broken driveline can cause personal injury.
When fitting the mower to the tractor, the telescoping driveline must be inspected to ensure that at its most compressed
position, the profiles do not “bottom out”, and when at its farthest extended position, there is sufficient engagement
between the profiles to operate safely. At its shortest length, there must be at least a 1” clearance between each profile
end and opposite profile universal joint. At its farthest operating extension, a minimum profile engagement of 8-1/2”
must be maintained.
Bottoming Out Check Procedure
(Figure 4-5)
● Disconnect Driveline from the tractor and slide the pro-
files together untill fully compressed.
● Place mark on the inner shield 1/8” from the end of the
outer shield.
● Reattach the driveline to the tractor PTO shaft.
● Raise the mower from the lowest to the highest posi-
tion and watch the driveline as it approaches the mark.
If the distance between the mark and the end of the
outer shield tube becomes less than 2” at any point,
the driveline must be shortened.
NOTE: When raising the mower, clearence must be
maintained between driveline and mower deck. If nec-
essary set stop on 3Pt. lift control lever to limit the lift
height of the mower.
Shorten the Driveline Profiles as follows
(Figure 4-6
)
● Remove Driveline from tractor PTO shaft.
● Position the mower to the point with the shortest dis-
tance between the tractor PTO shaft and the cutter
gearbox. Shut down the tractor and securely block the
mower in this position.
● Pull driveline apart and reattach yoke to the PTO Shaft.
● Hold the driveline sections parallel to one another and
measure 1” back from the yoke of each shaft and place
a mark on the opposite section. Cut this length with a
saw,
● Round off all sharp edges and debur.
● Throughly grease the reinstall the driveline.
● Recheck for propern operation.
(Figure 4-6)
(Figure 4-5)