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© 2005 Alamo Group Inc.
Section 7 - 7
Switch Blade (JD-5105-5205-5225-5325-5425-5525 Asy. Man.) 05/05
KNIFE REPLACEMENT
Knife Replacement:
The Knives are very sharp, use gloves and
caution when working with these knives. Secure
tractor so that it cannot be started until you are ready
for it to. Set the parking brake on the tractor. Make
certain cutter bar is completely on the down stroke,
this will prevent the cutter bar from moving down
ward. Also the Knives can be locked with a clamp so
it cannot move unless you want it to. If cutter bar
needs to move the best way is by using a punch in
one of the holes on the flywheel, remove clamp the
replace it after you have moved the cutterbar.
To remove the old knife the Knife retaining
bolt will have to be removed, usually these bolts
cannot be used again and it is recommended that
new one be used when changing knives. When lock
nut is removed the bolt should not fall out as the
shoulder of the bolted is ridged to make a drive in fit.
Drive the bolt out from the top, there are two bolts per
knife. There are two different length of these bolts,
the majority is 5/8" long. The first 7 bolts which also
bolt the knife section, knife backing strip and the knife
head weldment together is longer, 1-1/64" long.
Remove the locknut, if the lock nut cannot be re-
moved these bolts can be cut with a chisel under the
lock nut and the bolt driven out from the top, use
caution and not drive a punch or anything through the
hole that is larger than the bolt as it will damage the
hole in the knife backing plate.
Replace a Knife or a group of knives. The
knife can be changed without disassembly of the
cutter bar. The Knife retaining bolt is a special ridged
shouldered bolt, this makes the bolt have a wedged
fit into the knife backing strip. The special bolt will
need to be driven into the knife backing strip from the
bottom until the head of bolt bottoms out on the knife
backing strip. Install the new cone locknut and
snugly secure the bolt, do not over tighten these
bolts as they are 1/4" gr. 5 and will twist off. Torque
9 to 10 ft. lbs max. If all the rock guards and clips
were adjusted right to begin with they should not
have changed, but check them for alignment to
make certain. If the rock guards and clips need to be
adjusted go back to the guard ajustment section
earlier in the manual. (See Figure 11, 12, 13 & 14)
knife
Special
Knife Bolt
Special Cone
Locknut
Figure 12
Ridged
Shoulder
Knife
Backing
Strip
knife
knife
Ridged
Shoulder
Figure 13
Figure 14